The Roofing Book

Permitting Authorities / Tennessee / Williamson County, Tennessee - Building Codes Department

Do you need a permit to replace a roof in Unincorporated Williamson County, TN?

Adopted code

Williamson County, Tennessee - Building Codes Department

No, Unincorporated Williamson County, TN does not require a permit for like-for-like roof replacement (Williamson County, Tennessee - Building Codes Department).

Roof code checklist: Unincorporated Williamson County, TN

ItemAnswerCode citeSourceVerified
Permit to replace a roofNowilliamsoncounty-tn.gov2026-08-27
Repair permit thresholdPublishedR105.2williamsoncounty-tn.gov2026-08-27
Layer limit / roof-overNot published
Deck & sheathingNot published
Drip edgeNot published
Ice & water shieldNot published
Mid-roof inspectionNowilliamsoncounty-tn.gov2026-08-27
Impact-resistant (Class 4) roofingNot published
Wind design criteriaNot published
Adopted codePublishedwilliamsoncounty-tn.gov2026-08-27
Contractor license / registrationYestn.gov2026-08-27
Sales & use taxPublishedtn.gov2026-08-27

Each row comes from the sourced record on this page; full wording is in the table below. "Not published" means no official source for that item was found when the record was last verified.

Jurisdiction
Unincorporated Williamson County, Tennessee
Jurisdiction type
county
Address
1320 West Main St., Franklin, TN 37064
Contact
  • url: https://www.williamsoncounty-tn.gov/163/Building-Codes
  • phone: 615-790-5718
Roofing permit required
Not required
Contractor registration required
Required
Registration details
  • license: STATE licensing, with no county registration on top of it — and note that a Williamson County roofer needs the state license even though the County requires no permit for the work. The Tennessee Board for Licensing Contractors requires a Contractor's License (T.C.A. tit. 62, ch. 6) before contracting, bidding or negotiating a price on any project of $25,000 or more, and the Board's own guidance names roofing expressly: subcontractors "must be licensed when contracting directly with a contractor...to perform electrical, mechanical, plumbing, HVAC, or roofing work when that portion of the project is $25,000 or more." Tennessee's separate lower-tier Home Improvement License (threshold $3,000 to $24,999, which also names roofing) applies only in nine named counties — Bradley, Davidson, Hamilton, Haywood, Knox, Marion, Robertson, Rutherford and Shelby — and Williamson County is not among them. So in unincorporated Williamson County a state contractor's license is triggered only at the $25,000 project or subcontract threshold, and a smaller roofing job is reached by neither state licence tier. This is the same analysis the Franklin, Tennessee record carries, because Franklin sits inside this county.
Adopted code
Williamson County (unincorporated) has adopted and enforces the 2021 edition of the International Residential Code. The County's Building Codes Department states it in its own signed guidance letter of August 1, 2025, over the name of the Director/Building Official: "Williamson County (unincorporated) adopted and enforces the 2021 version of the International Residential Code (IRC)." The same letter directs that reroofing work "shall comply with adopted codes and ordinances, including Chapter 9/Roof Assemblies of the 2021 IRC" even where no permit is required. Whether the County has enacted local amendments to that code has not been established here; no county amendment list was read, so no claim is made either way.
Mid-roof inspection
Not required — No inspection of any kind is required for a residential roof repair or replacement in unincorporated Williamson County, so there is no mid-roof, deck, dry-in or final stage to schedule. The County's own August 1, 2025 guidance letter states it directly: "a building permit and inspection is not required for residential roof repairs or replacements," and again "Even though a permit and inspection is not required for a roof repair or replacement..." The letter closes by saying the Building and Neighborhood Services Department "is regularly asked about roof repairs and replacements and there is no other action for us in such cases." The absence of a mid-roof inspection here follows from the absence of any permit at all, which is a different situation from a jurisdiction that permits the work and inspects it only once at completion.
Repair permit threshold
NO PERMIT AT ANY SIZE, and no dollar or square-footage threshold exists to cross. This is unusual and it is the County's own published position, not an inference. Williamson County Building Codes issues a standing letter, "Re: Code Requirements for Roof Repair or Replacement," dated August 1, 2025 and signed by the Director/Building Official, which reads: "Per section R105.2.2 of the Code, application or notice to the Building Official is not required for ordinary repairs to structures. Accordingly, a building permit and inspection is not required for residential roof repairs or replacements." The letter applies to repairs and to full replacements alike and sets no size, cost or scope limit on the exemption. Two limits do apply and the County states both. First, quoting IRC Section R105.2: "exemption from permit requirements of the Code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of this jurisdiction." Second: "Even though a permit and inspection is not required for a roof repair or replacement the construction shall comply with adopted codes and ordinances, including Chapter 9/Roof Assemblies of the 2021 IRC," and "roof assemblies and materials shall be installed in accordance with the manufacturer's installation instructions." So the work is unpermitted, not unregulated: the code still governs, there is simply no county application, fee or inspection attached to it. This applies in the unincorporated county only — Franklin, Brentwood, Nolensville, Thompson's Station, Fairview and the Williamson County portion of Spring Hill run their own permitting.
Sales & use tax
9.75% combined. That is the Tennessee state rate of 7.00% plus the Williamson County local-option rate of 2.75%. The county rate was read directly from the Tennessee Department of Revenue's own quarterly Streamlined Sales Tax rate file for the quarter beginning July 1, 2026, jurisdiction code 187 (Williamson County), which carries 2.75% with an effective date of April 1, 2018 and no end date — the same file shows the prior 2.25% rate running from April 1, 1991 to March 31, 2018. Tennessee's local sales tax is levied at the county level with no separate city add-on layer, so 9.75% applies throughout Williamson County, inside its municipalities as well as in the unincorporated area this record covers.

More roof permit pages in Tennessee

Bartlett, TNRoof permit Brentwood, TNRoof permit Chattanooga, TNRoof permit Clarksville, TNRoof permit Collierville, TNRoof permit Roofing in TennesseeState hub

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The permitting authority for unincorporated Williamson County, Tennessee, in the Nashville metropolitan area, south of Davidson County. Its Building Codes Department enforces the 2021 International Residential Code in the unincorporated county. Incorporated municipalities inside the county — Franklin, Brentwood, Spring Hill (in part), Nolensville, Thompson's Station and Fairview — administer their own building codes and issue their own permits, so this record does not reach work inside those city limits.

Hail reports near the center of Williamson County, TN

Reports, last 24 months
37
Largest, last 24 months
3.00 in May 20, 2025
Most recent
May 20, 2025 3.00 in
Reports, last 5 years
51
5 most recent reports, last 5 years
DateHail sizeDistance
May 20, 20253.00 in3 mi SSE
May 20, 20253.00 in7 mi SE
May 20, 20252.75 in5 mi WSW
May 20, 20252.50 in5 mi S
May 20, 20252.00 in6 mi W

Source: NOAA Storm Prediction Center severe weather database and daily storm reports (reports since the start of the current year are preliminary), within 10 miles of the center of Williamson County, TN. Data through Oct 7, 2026, not updated since. A report is an observation, not a damage record.

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Sources

Roofing questions: Unincorporated Williamson County, TN

Do you need a permit to replace a roof in Unincorporated Williamson County, TN?

No, Unincorporated Williamson County, TN does not require a permit to replace a roof. NO PERMIT AT ANY SIZE, and no dollar or square-footage threshold exists to cross. This is unusual and it is the County's own published position, not an inference. Williamson County Building Codes issues a standing letter, "Re: Code Requirements for Roof Repair or Replacement," dated August 1, 2025 and signed by the Director/Building Official, which reads: "Per section R105.2.2 of the Code, application or notice to the Building Official is not required for ordinary repairs to structures. Accordingly, a building permit and inspection is not required for residential roof repairs or replacements." The letter applies to repairs and to full replacements alike and sets no size, cost or scope limit on the exemption. Two limits do apply and the County states both. First, quoting IRC Section R105.2: "exemption from permit requirements of the Code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of this jurisdiction." Second: "Even though a permit and inspection is not required for a roof repair or replacement the construction shall comply with adopted codes and ordinances, including Chapter 9/Roof Assemblies of the 2021 IRC," and "roof assemblies and materials shall be installed in accordance with the manufacturer's installation instructions." So the work is unpermitted, not unregulated: the code still governs, there is simply no county application, fee or inspection attached to it. This applies in the unincorporated county only — Franklin, Brentwood, Nolensville, Thompson's Station, Fairview and the Williamson County portion of Spring Hill run their own permitting.

Do roofing contractors need a license or registration in Unincorporated Williamson County, TN?

Yes. STATE licensing, with no county registration on top of it — and note that a Williamson County roofer needs the state license even though the County requires no permit for the work. The Tennessee Board for Licensing Contractors requires a Contractor's License (T.C.A. tit. 62, ch. 6) before contracting, bidding or negotiating a price on any project of $25,000 or more, and the Board's own guidance names roofing expressly: subcontractors "must be licensed when contracting directly with a contractor...to perform electrical, mechanical, plumbing, HVAC, or roofing work when that portion of the project is $25,000 or more." Tennessee's separate lower-tier Home Improvement License (threshold $3,000 to $24,999, which also names roofing) applies only in nine named counties — Bradley, Davidson, Hamilton, Haywood, Knox, Marion, Robertson, Rutherford and Shelby — and Williamson County is not among them. So in unincorporated Williamson County a state contractor's license is triggered only at the $25,000 project or subcontract threshold, and a smaller roofing job is reached by neither state licence tier. This is the same analysis the Franklin, Tennessee record carries, because Franklin sits inside this county.

What building code does Unincorporated Williamson County, TN use?

Williamson County (unincorporated) has adopted and enforces the 2021 edition of the International Residential Code. The County's Building Codes Department states it in its own signed guidance letter of August 1, 2025, over the name of the Director/Building Official: "Williamson County (unincorporated) adopted and enforces the 2021 version of the International Residential Code (IRC)." The same letter directs that reroofing work "shall comply with adopted codes and ordinances, including Chapter 9/Roof Assemblies of the 2021 IRC" even where no permit is required. Whether the County has enacted local amendments to that code has not been established here; no county amendment list was read, so no claim is made either way.

Is a mid-roof inspection required in Unincorporated Williamson County, TN?

No. No inspection of any kind is required for a residential roof repair or replacement in unincorporated Williamson County, so there is no mid-roof, deck, dry-in or final stage to schedule. The County's own August 1, 2025 guidance letter states it directly: "a building permit and inspection is not required for residential roof repairs or replacements," and again "Even though a permit and inspection is not required for a roof repair or replacement..." The letter closes by saying the Building and Neighborhood Services Department "is regularly asked about roof repairs and replacements and there is no other action for us in such cases." The absence of a mid-roof inspection here follows from the absence of any permit at all, which is a different situation from a jurisdiction that permits the work and inspects it only once at completion.