Tennessee Building Codes, Permits and Contractor Rules
Here’s every rule from our 50-state guides for Tennessee on one page: the residential building code, frost depth, retaining wall permits, the 811 dig law, drainage law, contractor licensing, deposit limits, mechanics lien deadlines, workers’ comp, planting zones and frost dates. Each section links the official source and the full 50-state comparison.
Tennessee at a glance
- Building code: 2018 IRC (statewide; local enforcement varies)
- Frost depth: Set by your local building department
- 811 notice: At least 3 working days (72 hours excluding weekends and holidays) but not more than 10 full working days before excavation
- Contractors: License for some trades/amounts only
- Deposits: No statewide cap
- Liens: Suit within 1 yr of completion (prime only)
- Workers’ comp: 5+ (construction: 1+)
- Drainage rule: Civil law (natural flow)
- Planting zones: 6a to 8a
| Topic | Tennessee | Compare |
|---|---|---|
| Residential building code | 2018 IRC (statewide; local enforcement varies) | All states |
| Frost line depth | Set by your local building department | All states |
| Retaining wall permit | Set locally. The state's residential program requires state permits only for new one- and two-family dwellings and townhouses and for additions of 30 sq ft or… | All states |
| 811 notice before digging | At least 3 working days (72 hours excluding weekends and holidays) but not more than 10 full working days before excavation | All states |
| Contractor license | License for some trades/amounts only | All states |
| Deposit limit | No statewide cap | All states |
| Right to cancel | 3 business days, sales made at home | All states |
| Lien filing deadline | Suit within 1 yr of completion (prime only) | All states |
| Workers’ comp required | 5+ (construction: 1+) | All states |
| Drainage between neighbors | Civil law (natural flow) | All states |
| Planting zones (2023 USDA) | 6a to 8a | All states |
| Frost dates (NOAA) | Last frost mid-Mar (Memphis) to mid-Apr (Crossville); first frost late Oct (Crossville) to mid-Nov (Memphis) | All states |
Tennessee residential building code
- Code
- 2018 International Residential Code with Tennessee amendments (adopted by the State Fire Marshal, Rule 0780-02-23-.02)
- How it applies
- Statewide, but municipalities can opt out
- In effect since
- July 16, 2020
- Code agency
- Tennessee State Fire Marshal's Office, Codes Enforcement (Department of Commerce & Insurance)
- Who enforces it
- Cities and counties that enforce their own residential code are exempt, and local governments may opt out of state residential enforcement. Elsewhere, permits come through state-authorized permit agents. Sprinklers are not required in homes.
- Good to know
- Tennessee's state residential code is based on the 2018 IRC. Many cities and counties enforce their own code instead, so check who issues permits where you live.
Compare building codes in all 50 states
Frost line depth in Tennessee
- Who sets it
- Local building department
- Local examples
- Knox County: 12 in. minimum below undisturbed ground or finished grade (no frost depth stated)
- Good to know
- Knox County gives a minimum footing depth, not a frost depth. For Memphis, Shelby County or Nashville, check with the local codes department.
Frost line depth in every state
Retaining wall permits in Tennessee
- Permit exemption
- Set locally. The state's residential program requires state permits only for new one- and two-family dwellings and townhouses and for additions of 30 sq ft or more of interior space (Rule 0780-02-23-.05); retaining walls aren't covered. Cities and counties that enforce their own codes decide.
- Who decides
- Your city or county building department decides (in opt-out jurisdictions, under its own code).
- Good to know
- The state's permit program covers only new homes and additions of 30 sq ft or more of interior space, not retaining walls. Cities and counties that enforce their own codes decide.
Retaining wall permit rules in every state
811 dig law in Tennessee
- One-call center
- Tennessee 811
- Notice before digging
- At least 3 working days (72 hours excluding weekends and holidays) but not more than 10 full working days before excavation
- Ticket good for
- 15 calendar days from the start date and time on the ticket
- Hand-dig zone
- Facility width plus 2 ft (24 in.) on each side; strip at least 4 ft wide
- Homeowners
- Partial exemption: the notice requirement does not apply to 'a property owner utilizing non-mechanized tools or equipment on their own property' (T.C.A. § 65-31-106(e)(1)), with no depth or easement condition. Otherwise 'excavation' includes hand digging; agricultural tilling and fence-post holes on private property are excluded only outside a recorded operator easement and more than 100 ft from a street or highway pavement edge. Any mechanized digging requires a call. Tennessee 811's pages do not mention the owner exemption.
- The law
- Tenn. Code Ann. §§ 65-31-101 to 65-31-120
- Good to know
- If work isn't finished within 15 calendar days of the start date, you need a new notice. Tennessee 811 says to update tickets at least 3 working days before they expire.
Drainage law and stormwater permits in Tennessee
- Rule
- Civil law (natural flow)
- The rule
- Natural drainage (label assigned; Tennessee appeals courts say the common enemy rule does not apply): lower land must receive water that naturally flows from higher land, a landowner may not gather or obstruct the natural flow so as to turn it onto a neighbor's property to the neighbor's injury, and wrongful interference with natural drainage is an actionable nuisance. These statements come from the Court of Appeals; no Tennessee Supreme Court decision was found.
- Why Secondary source
- The cases are from the Tennessee Court of Appeals; no Tennessee Supreme Court decision was found.
- Leading case
- Blackwell v. Butler (with Butts v. City of South Fulton). Blackwell v. Butler, 582 S.W.2d 760 (Tenn. Ct. App. 1978); Butts v. City of South Fulton, 565 S.W.2d 879 (Tenn. Ct. App. 1977); citing Slatten v. Mitchell, 22 Tenn. App. 547, 124 S.W.2d 310 (1938)
- What it means for your yard
- Tennessee appeals courts expect natural drainage to be left alone: your downhill neighbor has to take water that naturally runs off your lot, but if your regrading, downspouts or patio gather water or block its natural path and turn it onto a neighbor's property, causing damage, you can be liable for a nuisance. The cases are from the Court of Appeals, not the state Supreme Court.
- Construction stormwater permit
- Tennessee Department of Environment and Conservation (TDEC), Division of Water Resources: 1 acre or more of disturbance, or less if part of a larger common plan of development or sale (TNR100000; the final 2026 permit is effective Oct. 1, 2026 to Sept. 30, 2031)
- State rules below 1 acre
- No statewide rule below the 1-acre permit found; check your county and town.
- Local rules
- Tennessee cities and counties with MS4 programs often require grading or land disturbance permits for smaller projects.
- Good to know
- Tennessee appeals courts say the 'common enemy' rule does not apply: downhill land must take natural runoff, but gathering or blocking water so it floods a neighbor can be a nuisance. There is no Tennessee Supreme Court decision on point, so get local legal advice on a dispute. State construction stormwater permits start at 1 acre.
Contractor licensing in Tennessee
- Statewide rule
- License for some trades/amounts only
- Agency
- Tennessee Board for Licensing Contractors (Dept. of Commerce and Insurance)
- Who needs it
- Prime contractors on projects of $25,000 or more need a state contractor license. In Bradley, Davidson, Hamilton, Haywood, Knox, Marion, Robertson, Rutherford and Shelby counties, residential remodeling jobs of $3,000 to $24,999 need a home improvement license.
- When it applies
- Contractor license for projects of $25,000 or more; home improvement license for residential remodeling of $3,000 to $24,999 in nine counties
- Check a contractor
- Official lookup
- Licensed separately
- Subcontractors doing electrical, mechanical, plumbing, HVAC or roofing work need a license when their portion is $25,000 or more (masonry $100,000 or more).
- Good to know
- The home improvement license applies only in counties that have adopted the law. A surety bond option for license limits was added July 1, 2026.
Contractor license requirements in every state
Contractor deposits and your right to cancel in Tennessee
- Deposit limit
- No statewide cap.
- Right to cancel
- Home solicitation sales: may cancel until midnight of the third business day after signing; the right can't be waived except for a signed, dated emergency request where the seller has substantially started (Tenn. Code §§ 47-18-701 to 47-18-708, § 47-18-703).
- Other protections
- Contractor's license required for projects of $25,000 or more; a Home Improvement license (with a $10,000 bond or equivalent) is required for $3,000–$24,999 residential remodeling jobs in Bradley, Davidson, Hamilton, Haywood, Knox, Marion, Robertson, Rutherford and Shelby counties (Tenn. Code § 62-6-501 et seq., per the Board for Licensing Contractors).
- The law
- Tenn. Code §§ 47-18-701 to 47-18-708 (Home Solicitation Sales); § 62-6-501 et seq. (home improvement licensing)
- Good to know
- Tennessee officials advise paying no more than one-third up front. In nine counties, including Davidson, Knox and Shelby, remodelers on $3,000–$24,999 jobs need a state Home Improvement license.
Contractor deposit limits in every state
Mechanics lien deadlines in Tennessee
- Lien deadline (prime)
- No recording is needed to keep the lien against the owner: it lasts 1 year after the improvement is completed or abandoned (Tenn. Code § 66-11-106). To keep priority against later buyers or lenders, record a sworn statement within 90 days after completion or abandonment (§ 66-11-112).
- Lien deadline (sub/supplier)
- No lien on owner-occupied residential property (Tenn. Code § 66-11-146(a)). On other property: serve a written notice of lien on the owner within 90 days after completion or abandonment; the lien then lasts 90 days from service unless suit is filed (§§ 66-11-112, 66-11-115).
- Preliminary notice (sub/supplier)
- Not applicable on owner-occupied residential property, where only the prime contractor has a lien (Tenn. Code § 66-11-146(a)). On other property, remote contractors must serve the owner and prime a notice of nonpayment within 90 days after the last day of each month they worked; that rule doesn't apply to one- to four-family residential units (§ 66-11-145).
- Notice of intent
- Not required.
- Enforce within
- Prime: suit within 1 year after the improvement is completed or abandoned (Tenn. Code § 66-11-106). Remote contractors on non-residential property: within 90 days after serving the notice of lien (§ 66-11-115).
- Homeowner rules
- On a home the owner lives in as a principal residence (one unit, or two to four units with the owner in one), only the prime contractor can claim a lien; subs and suppliers cannot lien the home (Tenn. Code § 66-11-146(a)).
- The law
- Tenn. Code Ann. Title 66, Ch. 11, Part 1 (Mechanics' and Materialmen's Liens), § 66-11-101 et seq.
- Good to know
- In Tennessee, subcontractors and suppliers can't put a lien on a home the owner lives in; only the contractor hired by the owner can. That lien lasts 1 year after the work is completed or abandoned, so suit must be filed within that year, and recording a sworn statement within 90 days protects it against later buyers and lenders.
Mechanics lien deadlines in every state
Workers' comp requirements in Tennessee
- Who must carry it
- Non-construction: 5 or more employees, counting part-time workers, minors and working family members (sole proprietors, partners and LLC owners not counted; full-time corporate officers counted). Construction: 1 or more employees, including seasonal, part-time, family and as-needed workers, based on the nature of the business (T.C.A. Title 50, Ch. 6; Tennessee BWC).
- Owners and officers
- Construction business owners must carry coverage on themselves unless they qualify for and register on the state's Workers' Compensation Exemption Registry; an exemption covers only the named owner, and exempt owners must still cover all employees. Outside construction, owners of sole proprietorships, LLCs and partnerships aren't counted, and full-time corporate officers may exclude themselves with Form I-6 (Tennessee BWC).
- Subcontractors
- A principal, intermediate contractor or subcontractor is liable for compensation to a sub's employees injured on the job premises, like the immediate employer (T.C.A. § 50-6-113(a), (d)); for construction services providers, § 50-6-113 does not apply (§ 50-6-113(f)) and the construction rules in Part 9 (T.C.A. § 50-6-901 et seq.) govern. Check every sub's coverage or exemption before work.
- Penalties
- Employers without required coverage may be assessed a penalty equal to 1.5 times their total estimated annual premium; penalties also apply to employers who misclassify workers as independent contractors or subcontractors (Tennessee BWC Uninsured Employers Fund page).
- The law
- T.C.A. Title 50, Ch. 6; §§ 50-6-102, 50-6-113, 50-6-901 et seq.
- State agency
- Tennessee Department of Labor and Workforce Development, Bureau of Workers' Compensation
- Good to know
- Tennessee construction businesses need coverage with one employee, and owners must cover themselves unless they're on the state Exemption Registry. Other businesses need it at 5 employees.
Workers' comp requirements in every state
Planting zones in Tennessee
- 2023 USDA zones
- 6a to 8a
- Coldest-night range
- −10°F to 15°F
- Warmest area
- Memphis and Chattanooga
- Example cities
- Nashville: 7b, Memphis: 8a, Knoxville: 7b, Chattanooga: 8a
- Good to know
- Most of Tennessee is zone 7b, with Memphis and Chattanooga at 8a. Zones drop with elevation in the eastern mountains, so gardeners there should look up their own ZIP code.
Frost dates in Tennessee
| Station | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|
| Memphis West Tennessee | March 16 | November 16 | 244 |
| Nashville Middle Tennessee | March 31 | November 3 | 217 |
| Knoxville East Tennessee valley | April 1 | November 2 | 215 |
| Crossville Cumberland Plateau | April 16 | October 23 | 189 |
- Typical range
- Last frost mid-Mar (Memphis) to mid-Apr (Crossville); first frost late Oct (Crossville) to mid-Nov (Memphis)
- Good to know
- These are typical (50%) dates from NOAA's 1991–2020 climate normals, so about half of years still bring a 32°F night after the listed spring date. In Tennessee, the last spring frost at the stations listed ranges from mid-March around Memphis to mid-April around Crossville.
- Local frost or planting guide
- University of Tennessee Extension (UTIA)
Frequently Asked Questions
What building code does Tennessee use?
2018 International Residential Code with Tennessee amendments (adopted by the State Fire Marshal, Rule 0780-02-23-.02). It applies as follows: statewide, but municipalities can opt out. Your local building department can confirm the edition and amendments for your address.
How deep is the frost line in Tennessee?
Frost depth is set by local building departments. Footings for houses, additions and attached decks go below it.
How much can a contractor ask for up front in Tennessee?
No statewide cap. Cancel rights: Home solicitation sales: may cancel until midnight of the third business day after signing; the right can’t be waived except for a signed, dated emergency request where the seller has substantially started (Tenn. Code §§ 47-18-701 to 47-18-708, § 47-18-703).
How long does a contractor have to file a mechanics lien in Tennessee?
No recording is needed to keep the lien against the owner: it lasts 1 year after the improvement is completed or abandoned (Tenn. Code § 66-11-106). To keep priority against later buyers or lenders, record a sworn statement within 90 days after completion or abandonment (§ 66-11-112). Subcontractors and suppliers may have different notice rules; see the section above.
What planting zone is Tennessee?
On the 2023 USDA map, Tennessee runs from zone 6a to 8a. Examples: Nashville 7b, Memphis 8a, Knoxville 7b. Enter your ZIP on the USDA map for your exact zone.
Do contractors need workers' comp in Tennessee?
Non-construction: 5 or more employees, counting part-time workers, minors and working family members (sole proprietors, partners and LLC owners not counted; full-time corporate officers counted). Construction: 1 or more employees, including seasonal, part-time, family and as-needed workers, based on the nature of the business (T.C.A. Title 50, Ch. 6; Tennessee BWC). Owner exemptions and subcontractor rules are in the workers’ comp section above.
When is the last frost in Tennessee?
At the NOAA stations we list: Last frost mid-Mar (Memphis) to mid-Apr (Crossville); first frost late Oct (Crossville) to mid-Nov (Memphis). These are typical (50%) dates from the 1991–2020 climate normals, so about half of years still bring a 32°F night after the spring date.
This page is general information, not legal or tax advice. Rules change; the agencies and statutes linked above have the final word.
Tennessee in each 50-state guide: Frost line depth · 811 dig laws · Retaining wall permits · Contractor licensing · Contractor deposit limits · Building codes · Planting zones · Mechanics lien deadlines · Workers' comp · Frost dates · Drainage laws · Noxious weed laws · Rainfall and snowfall · Landscaper pay · Pesticide applicator licensing · Landscaping sales tax · All state guides
Last checked October 31 and November 1, 2026 against official state and local sources for this state. Rules change; your state agency or local building department has the final word. Spot something out of date? Email info@muthlerlandscaping.com and we’ll fix it.
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Cite as: Muthler Landscaping & Construction, “Tennessee Building Codes, Permits and Contractor Rules,” https://muthlerlandscaping.com/state-guides/tennessee/ (last checked November 9, 2026).
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