Skip to main content
Sign inGet started free

TN · County

Williamson County, TN.

Williamson is in TN (IECC zone 3A, design wind 90 mph).

Coverage in progress
Adopted edition

IRC 2021

Local amendments override state floor.

Design wind speed

90 mph

ASCE 7 Risk Cat II, 3-second gust at 33 ft. Drives fastener spacing, hold-downs, and opening protection.

Climate zone (IECC)

3A

Drives R-value, fenestration U-factor, and air-leakage envelope rules.

Special zones
  • HVHZ
  • WBDR
  • WUI
  • FEMA SFHA possible
Permit office

Williamson County Building Department

NULL

Common amendments + overlays

What's specific to this county.

  • §01County has local amendments to the state floor — consult the building department.

City directory

2 cities indexed in Williamson County.

Each city page lists the local amendments (if any), parent county, and the local permit office.

Working in Williamson County?

Pull an address-levelcode packetfor any property in Williamson County. SkyCanvass resolves the parcel, looks up the adopted edition + the Williamson County-specific amendments listed above, and emits a cited packet ready for permit submittal.

See theTennessee state overviewfor the broader context, or browse thestate directory.

Pull a Williamson County code packet.

Free to start — property lookups, state code access, the hail map, and your first storm report on us. No credit card required to look up an address.

Export this county's code packet.See TN overview