Unincorporated Williamson County
Williamson County, Tennessee
Last verified September 16, 2026
Unincorporated Williamson County is the unincorporated portion of Williamson County, Tennessee — the area outside the limits of any city or town, with an online portal for searching and pulling active or historical building permits. Use the contact information below to reach the local building department, or the mailing address if the jurisdiction needs to be listed as a certificate holder on a contractor's insurance documentation.
Contact
- Phone
- 615-790-5718
- Department Site
- Williamson County Building Codes Division (opens in a new tab)
Permit Search
Certificate Holder Mailing Address
Williamson County Building Codes Division1320 West Main Street, Suite 400
Franklin, TN 37064
Use this address when the jurisdiction needs to be listed as a certificate holder on a contractor's insurance documentation.
Additional Notes
County-run: issues permits only for unincorporated Williamson County; Franklin, Brentwood, Fairview, Nolensville, Spring Hill, and Thompson's Station each run their own city departments. (Verified directly with the department's official website, September 2026.)
What You Need Before Applying for a Permit
Most building departments ask for the same core package before they'll issue a permit: a completed application naming the property owner and contractor, the contractor's state license number and proof of insurance (general liability, and workers' comp if employees are on the job), a notice of commencement or equivalent recorded filing for larger jobs where the state requires one, and scaled plans or a site plan for anything beyond minor repairs. Roofing, fence, pool, and solar permits typically have their own simplified checklists — Unincorporated Williamson County's department (above) can confirm exactly what applies to your project.
Why this matters for insurance: permit history is one of the first things an underwriter or adjuster checks. Unpermitted work — a finished basement, an added bedroom, a rebuilt roof — can complicate a claim or even void coverage for that portion of the loss, and it routinely surfaces during a home inspection. Pulling the right permit up front, and keeping the closed-permit record on file, protects both the property's value and its insurability at resale.
More in Williamson County
See Williamson County property and court records →
Other building permit jurisdictions in Williamson County: