DWELL BEYOND THE ORDINARY
ADU Regulations in Tennessee: The Complete Guide
If you’ve been dreaming of building an Accessory Dwelling Unit (ADU) whether for family, rental income, or a cozy retreat, Tennessee might just be the perfect place to plant those roots. With its rolling hills, charming small towns, and vibrant cities, the Volunteer State offers a blend of natural beauty and practical opportunity that makes adding an ADU both inviting and worthwhile.
From the misty peaks of the Great Smoky Mountains to the winding waters of the Tennessee River, this state is packed with scenic views and outdoor adventures. Whether you’re hiking trails in Chattanooga, catching live music in Nashville, or soaking up the peaceful charm of rural farmland, Tennessee offers a setting that feels like home yet full of possibility.
More and more homeowners are turning to ADUs as a flexible housing solution, and while Tennessee doesn’t have a statewide ADU mandate, many cities and counties are starting to embrace them. Zoning rules vary depending on where you are, but whether you’re in a city like Knoxville or a quieter county, there are growing pathways to make your ADU vision a reality.
In this guide, we’ll walk you through everything you need to know about building an ADU in Tennessee, where they’re allowed, what the rules are, and how you can take the next steps in one of the South’s most beautiful and welcoming states. Let the learning begin!
Are ADUs Allowed in Tennessee?
Yes, Tennessee allows ADUs in certain areas with specific regulations and requirements. Tennessee has no statewide regulations governing ADUs, which means discretion is left up to local governments. Depending on which county or municipality you reside in, you may find resistance or have difficulty installing a modular ADU. However, many sections of Tennessee offer some leniency and allowance for ADUs and specific guidelines for what they can be.
What Is Considered An ADU in Tennessee?
Tennessee considers an ADU to be a self-contained dwelling (living, cooking, bathing) as an accessory to a single-family home, on the same lot and ownership, and usually owner-occupied either in the main house or ADU. Only one ADU is permitted per lot in Tennessee. All of the modular ADUs from Zook Cabins fit this description!
Can Park Model Tiny Homes Be Used As ADUs?
Yes, although not in all areas of Tennessee. Some areas definitely allow mobile homes and RV living full time, which park model homes are categorized as. You may be required to have a permanent foundation in certain municipalities in order to qualify.
Can Log Cabins Be Used As An ADU?
Potentially. A prefab log cabin from Zook Cabins could be used as an ADU provided it meets the sizing restrictions and setback requirements. Some of the smaller models start at 700 square feet which would fall into most of Tennessee’s ADU sizing regulations. Request a free quote today to see how you could utilize a beautiful log cabin as an ADU.
Can Modern Cabins Be Used As An ADU?
Yes, a modern cabin could be considered an ADU if it falls within the correct sizing and zoning requirements. If you live in a more rural area with plenty of land, a modern cabin would be a great ADU option. Browse our selection of modern cabins to see if you can find a model that works for you.
What is the Difference Between a Prefab ADU & a Modular ADU?
Prefabricated ADUs arrive pre-finished and installed while still meeting the local foundation and building-code requirements. Modular ADUs, like our Sonoma ADU, are constructed off-site in sections but are permanently installed on a foundation and treated like traditional construction. Both are acceptable if built to code.
Size & Placement Requirements
What is the Minimum Size for an Accessory Dwelling Unit?
There is currently no state-wide minimum size for ADUs in Tennessee. Different areas range in requirements from 400-650 square feet as a minimum. For specifics on size restrictions, you can reach out to your local building and zoning department.
Can My ADU be Bigger Than My House?
No. Tennessee does not allow any ADUs to be bigger than the primary dwelling with most areas capping the size of 40-50% of the main house’s square footage.
How Close To My House Can I Build An ADU?
The setback requirements definitely vary from county to county or town to town. The general requirement is a minimum rear setback of 5 ft and a 10 ft separation from the main house. There might also be side setbacks and more explicit requirements for your local municipality. The building department for your area can provide more guidance on these requirements.
Do You Need A Permit For An ADU in Tennessee?
Yes, no matter where you build your ADU in Tennessee, you will need several permits including a building permit, mechanical permit, and likely an HVAC permit. These permits will give you the freedom to fully maximize the ADUs accessory features and change electrical wiring and plumbing if desired.
Are There Any Incentives or Grants for ADUs in Tennessee?
Currently there are no state-wide incentives or grants for ADU homeowners. However, some ADU homeowners have discovered success with affordable housing programs as a source of potential financial assistance. Your local municipality may also offer fee waivers, free ADU design plans, or other forms of assistance. Check with your local city hall to see what options are available for you.
What Features are Included in An ADU from Zook Cabins?
Are Zook Cabin’s ADUs Built to Code?
Yes, all of the Zook Cabins ADUs are built to your local building codes and in some cases, go above and beyond what is required. This means you won’t need to worry about modifying anything to fit the regulations; everything will be handled by our experienced team of builders and designers.
Can an ADU Have Multiple Bedrooms and Bathrooms?
Absolutely! Many Tennessee areas allow ADUs up to 1,000 square feet which gives ample room for multiple bedrooms and bathrooms. If you have a two story ADU, you increase the potential for a multi-bedroom space.
Zook Cabins offers several models that can be either one or two bedrooms, depending on your specific needs. Plus, we even have the Grove Model, which can be designed with two bathrooms!
Are ADUs A Good Investment?
Definitely. ADUs are an excellent investment because they can offer an additional source of income and increase your property value. Plus they offer the options for multi-generational living, a life-changing investment.
If your area allows it, consider turning your modular ADU into an Airbnb or long-term rental. For long-term rentals, monthly income could range from $1,940 to $2,600, or in some cases, even higher, depending on your area. The national average for renting out a 600 sq ft ADU long-term is around $1940 per month. Short-term rentals could go for even more, causing a quick ROI.
Curious how you can finance your ADU? Check out our blog post on the best ways to finance your ADU!
What Are the Requirements for ADUs in Each County in Tennessee?
Does Anderson County Allow ADUs?
The Anderson County Zoning Resolution restricts accessory structures generally and primarily addresses agricultural and storage uses which would not be not true ADUs with independent living facilities.
There is currently no explicit language authorizing residential ADUs separate from the primary single-family dwelling. Based on available zoning documents, it’s unclear whether ADUs are permitted—the zoning code treats accessory uses narrowly and does not describe ADUs intended for independent habitation. If you’re considering an actual ADU, you’d likely need to confirm with the County Planning & Development office.
Does Bedford County Allow ADUs?
Like other Tennessee counties, Bedford County’s zoning codes addresses general accessory-use regulations, but from the text available, there’s no specific definition or allowance for ADUs as habitable secondary dwellings.
The county does explicitly permit tiny homes, which are allowed provided they adhere to residential building codes (IRC Appendix Q). But tiny-home allowances don’t necessarily mean ADUs are permitted. Tiny homes might be primary dwellings and occasionally ADUs, but the Bedford zoning code does not clearly reference ADUs as an accessory to a primary home. So although tiny dwellings are regulated, it is advised to reach out to the Bedford Zoning Department for the most up-to-date information.
Does Benton County Allow ADUs?
No.
Benton County does not currently allow ADUs under its zoning ordinance. The county’s regulations make a clear distinction between accessory structures like garages and sheds, and residential structures. The county does not permit independent accessory dwellings with full living facilities such as kitchens and bathrooms.
There have been discussions and draft proposals to amend this policy to allow ADUs with conditions—such as limiting the ADU to 50% of the main home’s size and prohibiting rental use, but these changes have not been adopted into law. As it stands, ADUs are not permitted, and any attempt to add one would likely require a zoning change or special exception through the County Office.
Does Bledsoe County Allow ADUs?
It is unknown at this point.
Bledsoe County’s zoning and building regulations do not explicitly address ADUs, making their status unclear. The county does permit tiny homes under 400 square feet, provided they are built to IRC Appendix Q standards. These tiny homes may be used as primary dwellings, but the county’s zoning code offers no guidance on whether a second, independent residential unit can be placed on the same lot as a main home.
There is no definition of “accessory dwelling unit” in the public zoning materials, and no language supporting the use of detached or attached secondary living units with separate kitchens and bathrooms. Therefore, while a small home can serve as a main residence, it is unclear whether Bledsoe County permits ADUs in any legal capacity. Contact the Bledsoe Planning and Zoning for more information.
Does Blount County Allow ADUs?
Blount County’s zoning regulations allow for accessory buildings such as garages, barns, and storage sheds, but there is no explicit provision for ADUs as independent, habitable dwellings.
The county does not define ADUs in its zoning code, and it does not provide specific guidelines for permitting detached or attached secondary residences with full living facilities. As such, ADUs are not formally recognized or authorized, and it would likely require case-by-case approval or a zoning variance to move forward with one. The Blount County Office may be able to provide some more assistance on the ADU process.
Does Bradley County Allow ADUs?
Bradley County’s zoning documents do not appear to explicitly address or permit ADUs as defined secondary dwelling units. Multiple area plans authored by the county acknowledge that “Accessory dwelling units may be appropriate in some areas” but these references are vague and illustrative and do not explicitly outline any regulations for ADUs.
The official zoning resolution does not provide a definition of ADUs, nor set specific standards or allowable zones for ADU development. Until regulations are clarified or updated, ADUs are neither explicitly allowed nor clearly disallowed. Contact the Bradley Planning Office for answers to more questions.
Does Campbell County Allow ADUs?
Campbell County in Tennessee does not show any such amendments or definitions in its publicly available zoning or building codes. Tennessee statutes and local planning documentation for Campbell County, TN, do not include ADU definitions or explicit allowances, aside from standard accessory buildings and the general state allowance for tiny homes under. Therefore, it remains unclear whether ADUs are recognized or permissible in Campbell County, TN.
Does Cannon County Allow ADUs?
Yes!
Cannon County zoning materials show that the county’s permitting forms explicitly include an “Accessory Dwelling” option for new detached structures on the same lot as a principal dwelling. However, zoning district codes (e.g. R‑1) only list customary accessory buildings—not clearly residential ADUs—with the permitted accessory uses set in rear yards under setback rules.
So while the county apparently supports a process for permitting ADUs, the detailed ordinances lack comprehensive zoning language defining or regulating ADUs, making the allowance formally partially unclear. For more information, we advise reaching out to the Planning Commission for the clear regulations.
Does Carroll County Allow ADUs?
Carroll County has not adopted the state’s International Residential Code for residential structures, meaning there’s no statewide mandate for tiny homes or ADUs. In terms of zoning, there’s no clear language defining or permitting ADUs in publicly available documents.
While the absence of adoption of the state code offers flexibility in construction, it does not translate into explicit approval of ADUs. Due to this lack of clarity, we suggest you contact the County Office to find answers for more specific questions.
Does Carter County Allow ADUs?
Carter County allows tiny homes between 200–400 ft built to IRC Appendix Q and permanently anchored to a foundation as primary residences.
However, there’s no zoning code or building ordinance that defines or authorizes ADUs as secondary units on a lot with an existing primary house. Indeed, the county specifically prohibits conversion of non‑residential accessory buildings (like sheds) into tiny homes due to safety concerns. For more ADU-specific regulations, contact the Carter County Zoning Department.
Does Cheatham County Allow ADUs?
Yes!
Cheatham County’s zoning code does include a definition for “Accessory Dwelling”, referencing a second dwelling unit that is incidental to the principal building on the same lot Importantly, the code specifies that an ADU may not be rented, and the owner of the principal dwelling must reside in either the main house or the accessory unit. Although the size and setback requirements are not clearly outlined, the Cheatham County Planning Department is a great place to find out more information.
Does Chester County Allow ADUs?
Chester County permits tiny homes up to 400 ft under the state’s International Residential Code (IRC Appendix Q), and a building permit is required for any such structure.
However, publicly available zoning documents do not define or reference ADUs. There is no zoning language in Chester County that explicitly authorizes, defines, or regulates detached or attached habitable units with independent facilities as accessory dwellings. As a result, if you are interested in installing an ADU, you will need to reach out to the Chester County Zoning Department.
Does Claiborne County Allow ADUs?
Claiborne County has opted-out of Tennessee’s statewide residential building code system, meaning there is no countywide adoption of IRC Appendix Q, though incorporated areas may adopt local codes.
With no clear zoning provisions or process for ADUs, their permissibility in Claiborne County remains unclear and is likely dependent on local municipalities or conditional approvals. The Claiborne County Zoning Department can offer more guidance on the process.
Does Clay County Allow ADUs?
Clay County follows Tennessee’s building code, including IRC Appendix Q, so tiny homes under 400 ft are permitted, subject to state permitting and utility requirements. However, Clay County’s publicly available zoning ordinance does not define ADUs or specify whether one may be built as an accessory to a primary home.
The zoning code sections that do exist outline accessory uses generally but provide no language for habitable dwelling units as accessory structures. This means ADUs are not clearly addressed and likely require case-by-case zoning interpretation or variance. Contact the Clay County Planning Department for more information.
Does Cocke County Allow ADUs?
Yes! Cocke County’s supports ADUs with an economic development plan that recommends permitting ADUs in all residential zones except agricultural districts, and it explicitly discourages short‑term rental use for those units.
While the official zoning code online doesn’t show a detailed definition, this planning guidance strongly implies that ADUs are permitted, with the likely expectation they’ll be regulated via planning commission review. Still, you’ll want to confirm directly with the Zoning Department whether permitting standards and definitions are in place.
Does Coffee County Allow ADUs?
Coffee County’s publicly accessible zoning or planning materials do not include any definition or mention of accessory dwelling units, despite staffing for codes and planning.
There’s no online language indicating that habitable secondary dwellings are recognized or permitted in county zoning. In other words, ADUs are not explicitly allowed, and the county provides no code-based framework for them. The Coffee County Codes Compliance is the best place to find out further information regarding ADUs in Coffee County.
Does Cumberland County Allow ADUs?
Cumberland County’s online documentation, which is focused on subdivision rules, does not define or mention ADUs nor discuss accessory residential units in its zoning resolutions or subdivision ordinances. That silence makes it clear: the county zoning code does not formally authorize ADUs, nor offer any process for conditional use or permitting of secondary living units. To find out how you can have an ADU in Cumberland County, reach out to the Planning Commission.
Does Davidson County Allow ADUs?
At the county level, there are no official regulations around ADUs. In certain cities like Nashville, zoning clearly recognizes Detached Accessory Dwelling Units (DADUs) within designated overlay districts.
Other municipalities within Davidson County may also allow ADUs but at this time, there are no county wide regulations. For the most accurate information, reach out to your local planning department.
Does Decatur County Allow ADUs?
Decatur County’s publicly available zoning regulations do not contain any mention or definition of ADUs. The zoning ordinance and planning documents are silent on accessory dwelling units, and there appears to be no official process or language authorizing a secondary, habitable dwelling.
Based on available materials, ADUs are not explicitly permitted at the county level but the Decatur County Planning Department can offer more guidelines and regulations on ADUs.
Does DeKalb County Allow ADUs?
DeKalb County operates without a county-wide zoning ordinance—since 2011, there has been no zoning code governing unincorporated areas. The county relies solely on the state building code for construction standards.
Because there’s no zoning authority or code language addressing ADUs, accessory dwelling units are not formally recognized or allowed under county jurisdiction. However, there is more information on zoning, buildings, and permits on the DeKalb County website.
Does Dickson County Allow ADUs?
In a way, yes. Dickson County’s zoning ordinance does include an “Accessory Apartment” definition, describing a temporary unit within a one-family dwelling that is subordinate in size and appearance which is essentially an internal ADU but not a detached secondary dwelling.
There is no explicit allowance for a detached accessory dwelling unit. Thus, while internal accessory apartments may be permitted under strict conditions, full standalone ADUs are not clearly authorized. To request a special-use permit or variance, reach out to the Dickson County Zoning Department.
Does Dyer County Allow ADUs?
Right now, it’s unclear what Dyer County allows regarding ADUs. The county’s zoning resolution provides district classifications and allows accessory structures generally, but there is no zoning language or definition permitting ADUs for full residential use.
Standard accessory buildings are permitted, but habitable secondary units with independent facilities are not mentioned. For specific regulations, the Dyer County Planning Department can offer assistance.
Does Fayette County Allow ADUs?
Fayette County’s zoning resolution addresses accessory structures and development standards, but it does not define or authorize ADUs, no zoning provisions recognize living units separate from the main residence.
Without explicit code language or permitting procedures for ADUs, they appear to not be permitted in unincorporated areas. Contact your local zoning department for the next step forward.
Does Fentress County Allow ADUs?
Fentress County does not have any county zoning regulations or formal permitting for accessory dwellings. In unincorporated areas, no zoning code defines ADUs or offers a pathway for approval.
ADUs are not recognized or permitted at the county level; any regulation would depend on private covenants or municipal jurisdictions within the county. The Fentress County Zoning Department can assist you further with any additional questions.
Does Franklin County Allow ADUs?
Yes!
Franklin County’s zoning resolution explicitly defines and permits ADUs, stating that one accessory dwelling is allowed per lot with a single-family dwelling, with a maximum size of up to 1,000 sq ft, and certain owner-occupancy conditions apply. This ADU allowance is exciting news for potential ADU homeowners in Franklin County, and the next step would be reaching out to the Franklin County Zoning Department.
Does Giles County Allow ADUs?
It is unknown at this point. The publicly available Giles County online zoning materials do not include any language describing or permitting ADUs. Accessory structures are generally referenced, but there is no definition or authorization for separate dwelling units on a property.
Without explicit zoning allowances, ADUs appear to be not formally permitted, although at the local level, there might be more ADU regulations. The Giles County Planning Department may also be able to assist with more questions.
Does Grainger County Allow ADUs?
Grainger County zoning documents don’t show any accessible sections regarding ADUs. With no available references or formal zoning definitions, the permissibility of ADUs is unclear, but current absence suggests they are not explicitly allowed pending further verification. Grainger County Zoning Department can also offer more guidance on the ADU process.
Does Greene County Allow ADUs?
From available online sources, Greene County zoning lacks any definition, code section, or administrative rule addressing ADUs. Accessory structures may be permitted, but there is no zoning-based pathway for building a secondary habitable dwelling. ADUs appear to be not recognized at the county level. To find out the next steps forward, contact the Greene County Planning Commission.
Does Grundy County Allow ADUs?
Grundy County is currently embroiled in legal scrutiny over whether its zoning regulations were properly enacted, but publicly available ordinances do not include specific definitions or allowances for ADUs, especially second units attached or detached from a primary residence for the purpose of living in. As such, it remains unclear and you will need to reach out to the Grundy County Planning Office to see how they can further assist you.
Does Hamblen County Allow ADUs?
Per other Tennessee counties, the county’s zoning resolution includes generic accessory building provisions but does not define or permit accessory dwellings with full living facilities. Application forms for accessory buildings distinguish between with- and without-plumbing uses, but there’s no mention of ADUs as secondary residences with kitchens and baths. In short: ADUs are not explicitly authorized but the Hamblen County Government can offer further assistance.
Does Hamilton County Allow ADUs?
Yes! Hamilton County recently amended its zoning provisions to officially allow ADUs in any zoning district permitting single-family detached dwellings (except the A‑1 Agricultural District).
Regulations permit one ADU per principal dwelling, limit height and size, require same ownership, and prohibit ADUs on lots with duplexes or condos. To start the ADU process, reach out to the Hamilton County Planning Commission for guidance on the next steps.
Does Hancock County Allow ADUs?
Hancock County’s online regulations (subdivision codes) and planning documentation do not include zoning language recognizing or permitting ADUs. Planning documents focus on platting and setbacks, not dwelling types, and there’s no accessible zoning ordinance defining ADUs Thus, ADUs appear not permitted in unincorporated areas absent further local codes. Remember that this does not mean ADUs are not allowed in local municipalities. Therefore, you should reach out to your local zoning department to see what they have to say.
Does Hardeman County Allow ADUs?
It’s not clear at this point. Hardeman County’s zoning resolution lists accessory structures but provides no zoning definition or allowance for habitable accessory dwelling units equipped with kitchens and baths. The code distinguishes accessory buildings generically and doesn’t enable secondary residences independent from the primary dwelling. Therefore, ADUs are not formally recognized or allowed. However, they could still be permitted at the local level, so contact the Hardeman County Zoning Compliance to see what they suggest in terms of moving forward.
Does Hardin County Allow ADUs?
Hardin County’s online zoning references list permitted uses by the zoning district but provide no mention or definition of ADUs with full living facilities. The county’s formal zoning ordinance does not define ADUs or authorize secondary residences on lots with a principal home. Based on available land use guidance, ADUs are not clearly permitted under the existing zoning framework. This means you can reach out to the Hardin County Office for more specific ADU regulations.
Does Hawkins County Allow ADUs?
Hawkins County does not issue its own building or zoning permits, instead, permits are handled at the state level, and county documentation makes no mention of ADUs. The publicly available codes reference general accessory structures but offer no pathway or code language recognizing habitable secondary units. Therefore, if you want to learn more about ADUs in Hawkins County, you would need to reach out to the Hawkins County Planning Department.
Does Haywood County Allow ADUs?
At this time, Haywood County’s zoning resolution addresses general land use and districting but does not include a definition or allowance for ADUs. The county’s zoning text is silent on habitable accessory dwellings, and planning materials focus on district maps and appeals without mention of secondary living units. As it stands publicly, ADUs are not formally authorized so any interested ADU homeowners will need to contact the Haywood County Zoning Department.
Does Henderson County Allow ADUs?
Unfortunately, the lack of online resources Henderson County has means we are not able to find specific county-wide zoning ordinance language addressing ADUs. That said, municipal codes in the city of Hendersonville include accessory dwelling provisions. In the absence of county-level zoning text recognizing ADUs, the permissibility at the unincorporated county level is unclear, but the best next step is to reach out to the Henderson Planning Commission or talk to your local building inspector.
Does Henry County Allow ADUs?
Currently, Henry County does not maintain zoning in unincorporated areas and building permits are not required in those zones. Since there is no formal zoning authority governing accessory dwelling units in rural county areas, ADUs are not defined or recognized at the county level. You will need to contact your local municipality’s zoning department for the most accurate information.
Does Hickman County Allow ADUs?
It remains unknown at this time. Hickman County’s zoning resolution and subdivision amendments include general accessory structure language, but no specific reference to ADUs with independent kitchens or baths.
Review of county land use documentation and future land use plans confirms no zoning code provision for ADUs. As such, ADUs are not explicitly allowed and remain unrecognized by county zoning. The Hickman County Office can provide more specific ADU regulations and guidance.
Does Houston County Allow ADUs?
Following the pattern of other Tennessee counties, there is no indication in Houston County’s available zoning regulations that ADUS are defined or permitted. Searches show no ADU language or permitting guidelines, suggesting that ADUs are not explicitly allowed. As always, check with your local planning department or reach out to the Houston County Planning Department to see what regulations surround ADUs.
Does Humphreys County Allow ADUs?
In Humphreys County, the publicly posted documents cover subdivision standards and general development rules but there is no zoning ordinance language defining or authorizing ADUs.
County permitting materials also lack guidance on secondary dwellings. It appears ADUs are not formally recognized or allowed under county zoning. Because of this lack of clarity, it is important to call the Planning and Zoning Department or reach out to your local zoning department.
Does Jackson County Allow ADUs?
Jackson County’s countywide zoning materials are not readily available online, and no public references specify ADUs. While building permits may be handled by the state, there is no visible zoning language that defines or allows accessory dwelling units with full living facilities.
In the absence of explicit code language, ADUs are not clearly permitted. To find out more information, reach out to the Jackson County Planning Department.
Does Jefferson County Allow ADUs?
Yes!
Jefferson County does include ADU provisions. Its zoning resolution and Accessory Uses section outline requirements such as compatibility in architectural style, parking per bedroom, and occupancy limits, showing that ADUs are formally permitted under regulated conditions. For specific size and permit requirements contact the Jefferson County Zoning Office.
Does Johnson County Allow ADUs?
Like other Tennessee counties, Johnson County does not maintain zoning rules in unincorporated areas and relies on state-level permitting. Since no county zoning ordinance defines ADUs, there is no formal mechanism for permitting habitable secondary dwellings via local code.
As such, ADUs are not officially recognized or permitted at the county level, but local municipalities may still allow them. Contact your local building department for the clearest information and regulations.
Does Knox County Allow ADUs?
Yes! Knox County updated its zoning code to explicitly allow one internal, attached, or detached ADU per single-family lot, with clear standards covering owner‑occupancy, utility capacity, size limits, setbacks, parking, and design compatibility.
The code treats ADUs as permitted by right with the exception that they can not be placed in agricultural areas. For more information on how you can install an ADU on your Knox County property, reach out to the Planning Department.
Does Lake County Allow ADUs?
Lake County’s Unified Development Ordinance (UDO) governs land use in unincorporated areas, but there is no provision or definition of ADUs. The code does not recognize habitable secondary dwellings, and no permitting pathway exists for them.
Based on available zoning documents, ADUs are not explicitly permitted in Lake County but municipalities within Lake County may permit them. Because of this lack of clarity, it is important to call the Planning and Zoning Department or reach out to your local zoning department.
Does Lauderdale County Allow ADUs?
Just like other Tennessee counties, Lauderdale County makes no mention of ADUs in its development regulations or permit guidelines. Planning documents and permit office materials contain no definitions or processes for accessory dwelling units. Therefore, homeowners are left needing to reach out to the Permit Office for specific information regarding ADUs.
Does Lawrence County Allow ADUs?
Online resources for Lawrence County do not reveal any zoning provisions defining or allowing ADUs. Planning and municipal codes emphasize subdivision control and guest house provisions rather than accessory living units.
With no ADU language or permitting process found, they appear not officially permitted at the county level, although at the local level, they may be regulated more. Contact the Lawrence County Office for more specific ADU information.
Does Lewis County Allow ADUs?
Lewis County does not require building permits in unincorporated areas and has no codes department overseeing zoning. There is no zoning ordinance or regulation that defines, authorizes, or permits ADUs.
With no structured permitting or code language, ADUs are not recognized or permitted in unincorporated Lewis County. For more information contact your local zoning department or visit the zoning page of the Lewis County website.
Does Lincoln County Allow ADUs?
Lincoln County has a zoning resolution in place, but a review of the publicly available document contains no definition or allowance for ADUs. Permitted uses, accessory structures, and district regulations are described, yet ADUs are not included among them.
As a result, ADUs are not explicitly permitted under current county zoning regulations. To find specific regulations surrounding ADUs in Lincoln County, homeowners should contact the Planning and Zoning Department.
Does Loudon County Allow ADUs?
Loudon County’s zoning resolution specifies that only one principal building per lot is permitted, alongside customary accessory structures such as sheds or barns. There is no mention of ADUs anywhere in the ordinance. Thus, Loudon County’s zoning code does not authorize ADUs in unincorporated areas but for more information reach out to the Planning and Codes Enforcement.
Does McMinn County Allow ADUs?
McMinn County does not maintain a countywide zoning ordinance and only subdivision standards are publicly documented, which govern lot dimensions and utilities but make no reference to ADUs.
The absence of zoning language defining ADUs indicates that they are not formally permitted via zoning code in unincorporated areas. If you are interested in owning an ADU in McMinn County, you should reach out to the County Commissioner for more details.
Does McNairy County Allow ADUs?
McNairy County’s publicly available resources do not include a zoning code that defines or allows accessory dwellings with full facilities. While the county issues building permits in partnership with fire marshal and state inspectors, the zoning resolution and planning materials are silent on ADUs. There is no formal ADU-related permitting process or zoning definitions in evidence, implying that ADUs are not recognized or permitted under current county code.
Does Macon County Allow ADUs?
Macon County does maintain a formal zoning ordinance which does include an “Accessory Apartment” definition—described as a subordinate, temporary dwelling unit contained within the main single-family structure, without substantially altering its character.
However, this only covers internal ADUs, not detached accessory dwellings. There is no language permitting separate buildings with living facilities. As such, while internal accessory apartments might be allowed, detached ADUs are not clearly authorized under the county zoning code.
Does Madison County Allow ADUs?
Yes! Madison County zoning explicitly includes ADU provisions in the zoning ordinances indicating that habitable secondary units are recognized as conditional accessory uses. County building permit FAQs further clarify that accessory structures cannot be converted into residences without full compliance and a specific change-of-use permit. To find out the specific requirements for ADUs including size and permits, it is best to reach out to the Madison County Building Department.
Does Marion County Allow ADUs?
Marion County does not maintain zoning for its unincorporated areas, according to county planning FAQs. That means there is no zoning ordinance defining or permitting accessory dwelling units in rural parts of the county. Although subdivisions may be subject to covenants or HOA rules, there is no local zoning code that allows ADUs as habitable secondary residences. Therefore, to find out more specific information, homeowners in Marion County will have to reach out to their local zoning department for more information.
Does Marshall County Allow ADUs?
Yes, however, it is still a little unclear, but Marshall County is in the process of amending its zoning resolution and ADU standards.
Recent public documents show proposed amendments to clarify ADU square‑foot limits and unit criteria within the zoning code. This indicates that the county either already allows or is moving toward formalizing ADUs through zoning amendments.
While the final ordinance is still pending, the proposed code changes and zoning department materials suggest a regulated ADU allowance under defined standards. In the meantime, homeowners can still contact the Building and Zoning Office for the most up-to-date information.
Does Maury County Allow ADUs?
Here again, Maury County’s existing zoning resolution covers permitted accessory uses generally under defined zoning districts, but there is no ADU definition, size limit, or review process.
A public draft of an updated zoning ordinance is underway (as of mid-2025), which may include new ADU regulations, but as things currently stand, the county code does not express formal allowance for ADUs. Until more information is publicly available, you can contact the Building and Zoning Office.
Does Meigs County Allow ADUs?
Like other Tennessee counties, Meigs County does have subdivision regulations and a Zoning Resolution in place; however, publicly available documentation does not say anything about ADUs. This would indicate that regulations for ADUS are left up to the specific municipalities. If you live in Meigs County, reach out to your local building department for more guidance.
Does Monroe County Allow ADUs?
Monroe County includes zoning regulation within municipalities like Tellico Plains but while its zoning ordinance covers accessory buildings and lot standards, there is no formal ADU language visible, nor any specific accessory dwelling definition. Although local municipality texts (e.g. city of Monroe) mention accessory buildings, no evidence was found of allowed or regulated secondary living units as accessory dwellings in unincorporated areas. Therefore, to find out more specific information, homeowners in Monroe County will have to reach out to their local zoning department for more information.
Does Montgomery County Allow ADUs?
Montgomery County (unincorporated areas around Clarksville) operates under a formal zoning resolution—yet no sections were found defining or permitting ADUs within the county code.
Although municipal jurisdictions like Clarksville have ADU forms, the county’s zoning resolution itself does not reference habitable accessory dwelling units. To find out more about your municipality’s requirements, contact your local building department.
Does Moore County Allow ADUs?
It remains unclear at this point. Like many Tennessee counties, Moore County maintains zoning and subdivision rules, but the sections focus on accessory buildings such as storage or agricultural structures with no mention of ADUs. It is likely that the regulations for ADUs are not managed at a county level and are left up to the discretion of municipalities. To find out more useful information, go to the Moore County Building Permits.
Does Morgan County Allow ADUs?
Morgan County officially maintains a Planning & Zoning office; however, public resources provide no zoning ordinance sections or supplemental material that define ADUs or offer a mechanism for permitting accessory dwellings. General building permit and planning info lack any mention of habitable secondary units. This requires any further questions to be directed to the official Morgan County website.
Does Overton County Allow ADUs?
Overton County does not enforce building codes or zoning restrictions in unincorporated areas; building permits are not required outside of the city limits. Without zoning or permitting authority at the county level, there is no code-based allowance for ADUs. Accessory dwelling units are not regulated, recognized, or authorized by zoning outside municipal boundaries. To find out specific regulations regarding ADUs, homeowners should contact Permits and Zoning.
Does Perry County Allow ADUs?
Perry County’s online presence offers no zoning ordinance or code language regarding ADUs. The county appears to have limited land use regulation documentation accessible, and publicly posted material provides no process or definitions recognizing accessory dwellings as living units. The absence of zoning text or permitting guidance suggests that ADUs are not explicitly permitted in unincorporated Perry County. More guidance can be found at Perry County Planning Department.
Does Pickett County Allow ADUs?
The information for Pickett County is very limited to mapping and parcel information, and no zoning ordinance or ADU language is found. Without explicit zoning provisions, ADUs are not recognized or permitted in unincorporated Pickett County. For more information, reach out to the Pickett County Office for up-to-date regulations.
Does Polk County Allow ADUs?
Maybe. Polk County operates under subdivision regulations and zoning provisions, but there is no clear provision authorizing ADUs. A historic version of the zoning ordinance does reference “accessory apartments or garage apartments” permitted up to 40% of the primary dwelling’s floor area or a maximum of 750 sq ft, but that ordinance dates back over a decade and may no longer be in effect or updated. The current zoning code posted online does not contain a modern ADU section or definition. Without explicit current zoning language or a formal permitting process, it is advised to reach out to the Polk County Planning Department.
Does Putnam County Allow ADUs?
Yes! Until recently, Putnam County did not have a formal zoning code applied in unincorporated areas, but a newly published zoning ordinance (effective September 2024) introduces the term “Accessory Housing Unit”, defined as a secondary dwelling unit on the same lot as a single-family home with independent living facilities.
This aligns with typical ADU definitions and signals that Putnam County is now formally recognizing and permitting such secondary units under zoning standards. Requirements such as property owner occupancy, lot size, and design standards are still not publicly available, but can be confirmed with the Building Codes Department.
Does Rhea County Allow ADUs?
In Rhea County, public documents offer no definition or reference to Accessory Dwelling Units. While there are housing listings and local news indicating properties with separate living units labeled “ADU”, there is no documented county zoning code language or permitting guidance explicitly authorizing such units. As a result, ADUs are not clearly permitted by the county’s zoning regulations. The Rhea County Planning Commission can help answer any further questions about ADU regulations.
Does Roane County Allow ADUs?
Maybe. Roane County maintains a zoning resolution dating back to 2013 covering general land-use and accessory uses—but it does not include a definition or rules specific to ADUs as habitable secondary dwellings. The county subdivision regulations similarly reference accessory uses broadly, without addressing kitchens or secondary units. As such, ADUs are not formally permitted under the county’s current zoning framework.
Does Robertson County Allow ADUs?
It is not clear. Robertson County amended its zoning code around 2021, and while the updated accessory use section describes smaller accessory structures, it doesn’t specifically mention ADUs. There’s also no ADU-specific permitting process, covenant, or owner-occupancy rule in publicly available zoning materials. Consequently, ADUs are not explicitly authorized in Robertson County’s current zoning ordinance. However, the Robertson County Planning Department may be able to answer any specific questions on ADU regulations in the county.
Does Rutherford County Allow ADUs?
Yes, Rutherford County stands out with a detailed ADU policy. It’s official ADU packet lays out a formal application, declaration of covenant, recorded agreement, and design and occupancy standards.
The homeowner must reside in either the primary dwelling or the ADU with only one ADU is permitted per lot. A detached modular ADU has a minimum size of 300 square feet, and the maximum size is determined by the general accessory structure regulations. It is important to note that only family members or invited guests can lodge in the ADU which means Rutherford County does not allow any short-term rentals, unless given special permission. The Rutherford Planning and Engineering Department can also guide homeowners on the ADU process.
Does Scott County Allow ADUs?
Scott County lacks countywide zoning regulation in unincorporated areas, meaning no ADU-related language exists in county codes. Without zoning oversight, there is no official procedure to permit accessory units as habitable dwellings. The Scott County Development District may be able to field any more specific questions.
Does Sequatchie County Allow ADUs?
Publicly available zoning resources for Sequatchie County remain limited and make no mention of ADUs. The existing materials focus on subdivision standards and outbuilding allowances, but there is no explicit ADU definition or permitting process in county regulations. Thus, ADUs appear not permitted without further municipal overlay language. For more information, we advise contacting the Sequatchie County Department.
Does Sevier County Allow ADUs?
Sevier County’s zoning resolution includes broad “Accessory Use” references but does not define or regulate ADUs explicitly. That absence in the updated 2024 resolution implies that habitable secondary units are not formally permitted at the county level. To receive the proper permission for ADUs, contact the Sevier County Planning Department.
Does Shelby County Allow ADUs?
Yes! Shelby County’s zoning code provides a clear framework for Accessory Dwelling Units, permitting detached ADUs under specific conditions. Standards include unit size limits based on lot size (minimum of 10,000 square feet). ADU homeowners must also comply with design compatibility, reside on the lot and follow all the placement restrictions. Contact the Shelby County Planning Office for more specific details.
Does Smith County Allow ADUs?
Smith County maintains a zoning resolution updated as of 2018, but a review of public code extracts reveals no section explicitly defining or allowing ADUs. Standard accessory use terminology is present, but there is no explicit pathway for permitting full living units secondary to a single-family home. As such, ADU questions should be directed to Mark Nixon at the Planning Office.
Does Stewart County Allow ADUs?
At this time, Stewart County provides no zoning authority or planning commission for unincorporated areas, as confirmed in the 2023 community data profile. With no zoning resolution in force, there is no legal structure to enable or define ADUs. Any accessory dwelling used as a residence would lack formal recognition, meaning more questions should be directed to the Stewart County Office.
Does Sullivan County Allow ADUs?
It remains unknown at this point. Sullivan County’s official zoning resolution (updated May 2025) does not have any explicit language defining Accessory Dwelling Units. Planning & Codes materials make no mention of permitting habitable secondary units. With no established ADU regulations, it is up to the interested ADU homeowner to contact the Sullivan County Zoning Department.
Does Sumner County Allow ADUs?
Yes!
Sumner County allows ADUs in residential zones under its zoning regulations which sets permit requirements and standards for accessory units. An official ADU application form exists, reflecting that ADUs are both recognized and regulated at the county level.
While ADUs must meet criteria such as size limits, owner‑occupancy, and design compatibility, they are formally permitted. For the specific requirements, contact the Sumner County Regional Planning Commission at 615-451-6097.
Does Tipton County Allow ADUs?
Though Tipton County’s zoning code includes accessory structure provisions related to lot setbacks and accessory buildings generally, there’s no provision defining or permitting ADUs and no reference to ADUs in the published zoning resolution.
Tiny homes may still be allowed under state residential building codes, but there’s no explicit ADU pathway by zoning. Without ADU language or conditional-use procedures, habitable accessory units remain—not officially authorized. You will need to contact the Tipton Planning and Development to learn more.
Does Trousdale County Allow ADUs?
It is uncertain at this point. Trousdale County has zoning maps and subdivision regulations in place, yet none of the publicly accessible materials define or authorize Accessory Dwelling Units. There’s no online official reference to ADUs or secondary residences accessory to a main home. Contact Building, Planning, and Zoning to learn more.
Does Unicoi County Allow ADUs?
Unicoi County’s planning department is active, but neither county nor municipal codes present any explicit ADU terminology or allowance. The Town of Unicoi municipal code allows duplexes in certain residential zones but does not mention ADUs or accessory living units with kitchens and bathrooms. While tiny homes built to Appendix Q standards may qualify as primary dwellings under state rules, there’s no zoning framework for ADUs in either the county or town code. This means interested homeowners must contact the Zoning Department for more information.
Does Union County Allow ADUs?
It sure does! Union County’s Subdivision and Zoning Ordinance includes a dedicated ADU information packet. It defines conditions for ADU approval which include minimum qualifications such as being in R1–R4 residential zones, at least 2-acre lot size, presence of a single-family dwelling, and fire protection service. The regulations also state that the ADU cannot exceed 900 square feet and it can not be used for any short-term rental.
Does Van Buren County Allow ADUs?
Currently, any publicly available materials for Van Buren County are limited to maps and county info and there is no zoning ordinance or code addressing. While tiny homes may still be allowable under state building standards, there is no recognized zoning pathway to permit ADUs in Van Buren County. The County Office may be able to provide more clarity on ADU regulations.
Does Warren County Allow ADUs?
Yes! Warren County’s zoning ordinance includes a legal definition for Accessory Apartments (their term for ADUs), describing them as a subordinate unit that can be attached or detached with its own entrance, kitchen, sleeping area, and bath. It must remain subordinate to the primary residence and may not alter the character of a single‑family home or the neighborhood pattern.
Warren County expressly prohibits use of ADUs for unrelated tenants which means the unit may only be occupied by family members or by a single caregiver for someone residing in the principal dwelling. That effectively excludes uses like Airbnb, long‑term unrelated rentals, or secondary‑use income.
The regulations also specify that the ADU may not exceed 50% of the principal residence’s floor area with at least one additional parking space. For detailed dimensions or interpretations—especially if you’re planning an attached versus detached unit—you’ll need to contact the Warren County Building & Environmental Codes Department or the Joint Zoning Office directly for clarification and to ensure compliance
Does Washington County Allow ADUs?
Yes! Washington County’s zoning resolution includes a legal definition for “Accessory Dwelling Unit”, describing it as a full housekeeping unit (attached or detached), with separate entrance, kitchen, sleeping area, and bath.
The zoning resolution also outlines that ADUs can not be used for income purposes like Airbnb rentals or long-term rentals. This definition exists within the county’s adopted code and implies that ADUs are recognized under zoning, provided they comply with all the additional regulations. That said, the specific size requirements are not laid out, so you will need to contact the Washington County Office for more specific information.
Does Wayne County Allow ADUs?
Wayne County doesn’t appear to maintain countywide zoning for unincorporated areas. There’s no county zoning ordinance online that defines or permits ADUs, and building standards rely on state-level regulations.
While tiny homes built to IRC Appendix Q would comply with state code, county land use provisions do not include language permitting ADUs. The absence of zoning clarity means communication with the Wayne County Office is the best way to find out more information.
Does Weakley County Allow ADUs?
It is uncertain at this point because Weakley County has no public zoning ordinance or code language addressing Accessory Dwelling Units. County property records show permit activity handled via the Trustee’s office, but there is no explicit ADU permit pathway or formal requirement for ADUs with independent kitchens and baths. Because the county does not formally regulate ADUs, it is important to reach out to the Weakley County Planning Department for more guidance.
Does White County Allow ADUs?
While White County does operate a Planning Commission and offers residential building permits, there is no zoning resolution or ordinance text online that contains any reference to ADUs. Without published zoning language or ADU-specific sections, ADUs for dwelling purposes remain not explicitly permitted or regulated under county code. Tiny homes may be allowed under state building standards, but zoning appears silent on ADUs. The White County Planning Commission may be able to shed some light on ADU regulations.
Does Williamson County Allow ADUs?
Maybe. Williamson County has no zoning regulations in its unincorporated areas which means anything beyond city limits is governed by county subdivision rules only. ADUs are regulated at the municipal level (e.g. Franklin city), but countywide zoning offers no ADU definition or permitting.
As a result, ADUs in unincorporated parts are not governed by county zoning, and permission would fall to the local level. Contact the Williamson County Planning Department to find out more information.
Does Wilson County Allow ADUs?
Yes, Wilson County allows one ADU per single-family lot and it can either be detached, attached, or an internal conversion. The Building Department offers an ADU permit checklist that outlines further details about size restrictions and setback restrictions. To find out more information, contact the Building Codes Office to start the process.
Accessory Dwelling Unit Requirements by Municipality
| ADU Regulations by Municipality | |
|---|---|
| Nashville | Building Permits Central |
| Knoxville | Zoning User’s Manual |
| Memphis | Building and Zoning |
| Chattanooga | ADU Ordinance |
| Clarksville | Code of Ordinances |
| Brentwood | Planning and Zoning |
| Johnson City | Planning and Development Services |
| Jackson | Zoning Ordinances |
Does Nashville, Tennessee, Allow ADUs?
Yes! Nashville allows Detached Accessory Dwelling Units, but only in specific districts designated by Metro Nashville. These zones permit ADUs up to 1,200 square feet provided they meet strict criteria regarding lot area, setbacks, design compatibility, and access rules.
ADU standards include a minimum side and rear yard setbacks of 5 ft. and a 10 ft. separation from the primary dwelling. Nashville prohibits ADUs to be rented out short-term. Additionally, ADUs must be subordinate in size to the main house and remain architecturally compatible. Rental for income is generally prohibited in historic overlay districts. For more information contact the Nashville Planning Commission to learn more about permit processes and the next step forward.
Interested in owning an ADU in Nashville, TN? Zook Cabins would love to help you on your ADU journey. Request a free quote today and start dreaming!
Does Knoxville, Tennessee, Allow ADUs?
It sure does! Knoxville’s updated zoning code permits one ADU per single-family lot, whether internal, attached, or detached. For these ADUs, owner-occupancy is required in either the main dwelling or in the ADU. The ADU is not permitted to be seen from street view and must follow design and size standards laid out in the zoning codes. Depending on the lot size, an ADU of up to 1,200 square feet is allowed, or no more than 40% of the main dwelling. Contact Knoxville Planning and Zoning to start the process of owning your own modular ADU.
Does Memphis, Tennessee, Allow ADUs?
Yes. Memphis permits ADUs in residential zones that fall under the size and setback restrictions, parking requirements, and design compliance. Properties under 10,000 ft cannot have an ADU but lots between 10,000 sf and 1.5 acres may have an ADU up to 700 ft or one-third of the ground floor area. Lots larger than 1.5 acres may allow up to 50% of the primary dwelling’s floor area. Memphis does allow ADUs to be used as a short-term rental as long as the ADU does not have more than 4 bedrooms. For additional information, contact the Memphis Planning and Zoning Department.
Interested in owning an ADU in Memphis, TN? Zook Cabins would love to help you on your ADU journey. Request a free quote today and start dreaming!
Does Chattanooga, Tennessee, Allow ADUs?
Yes, Chattanooga adopted a city-wide ADU ordinance effective June 14, 2022. With this ordinance, ADUs are now permitted in site-built construction zones and they cannot exceed 700 square feet.
Each single-family dwelling is only allowed one ADU and it must be in the rear or side of the primary dwelling. Additionally, detached ADU height is capped at two stories or 24 ft, whichever is lower (and must not exceed the height of the principal structure). Chattanooga has a Department of Planning that is available for any further questions on size, permits, or setbacks.
Does Clarksville, Tennessee, Allow ADUs?
It sure does! Clarksville’s zoning ordinance allows one accessory dwelling unit per lot in residential zones. ADUs must be at least 400 ft and no larger than 40% of the principal building or 800 ft (whichever is smaller). Occupancy is limited to one family with a single sleeping room. Setbacks for all ADUs must meet applicable zone requirements. ADUs require permits and inspections if plumbing, HVAC or electrical work is involved, and must be on a permanent foundation. The Clarksville Regional Planning Commission is a great place to direct any further questions to.
Does Brentwood, Tennessee, Allow ADUs?
Yes! Brentwood passed Ordinance No. 1021 in Jan 2021, allowing ADUs and JADUs in all residential zoning districts. An ADU must be on the same lot as the primary dwelling, have its own full kitchen and bathroom, separate entrance, and meet safety codes. Junior ADUs (up to 500 ft) within the home are also permitted. For more specific information on size and permit requirements, reach out to the Brentwood Planning and Zoning Commission.
If you are ready to take the next step in the ADU journey, Zook Cabins would love to walk you through the process! Simply contact us to talk to a sales representative or request a free quote today!
Does Johnson City, Tennessee, Allow ADUs?
Yes! Johnson City’s zoning code permits “accessory residential units” in R‑zoned districts if certain conditions are met. Restrictions include a maximum ADU area of 700 square feet or 50% of the primary dwelling’s size.
Johnson City only allows one ADU per lot and owners must live on the lot. ADUs must meet building codes and can be converted from accessory structures (garage into an ADU). The Johnson City Zoning Department is available to answer any more questions about ADUs
Does Jackson, Tennessee, Allow ADUs?
Mostly. In Jackson, over 94% of zoned land allows ADUs under the zoning resolution as conditional accessory uses when they meet the size and occupancy guidelines.
The city has even launched an ADU design competition. Conversions (e.g., garage into living space) require proper ADU permitting or residential code approval. ADUs must also meet all the code requirements for plumbing, electrical, gas, and structural changes.
If you are ready to take the next step in the ADU journey, Zook Cabins would love to walk you through the process! Simply contact us to talk to a sales representative or request a free quote today!
Searching For An ADU Builder Serving Tennessee?
If you read this article and discovered your area in Tennessee allows ADUs, Zook Cabins is excited to offer you our ADU services. We service the entire US (excluding Alaska and Hawaii) and would love to install an ADU in your Tennessee area.
Our process starts by contacting us or requesting a free quote to begin visualizing your ideal ADU model. After that, we will walk with you through the whole process, offering guidance on permits, site preparation, and design preferences. The delivery and set up will all be handled by our expert team and you will have a beautiful modular ADU on your property before you know it.
Tiny Homes & ADU Rules By State: How Do They Compare?
Because tiny homes and ADUs both fall into the world of non-traditional living or “tiny living” the regulations surrounding both of them can overlap at times. Tiny homes are allowed in most Tennessee areas under Appendix Q with a few exceptions. As discussed in the article, ADUs are permitted in certain Tennessee municipalities, but not all.
Conclusion…
While every state has its own regulations for ADUs, Tennessee clearly has quite a range of what is and what is not acceptable. When you are ready to start your ADU project, keep us here at Zook Cabins in mind. We would love to help you along the journey of creating your very own ADU.