Spring Hill, TN Building Safety: Building Permits (2026)

Chapter 1 of Title 12 adopts the International Building Code, 2018 edition, for commercial buildings, and § 12-401 adopts the 2018 International Residential Code for one- and two-family dwellings, with the single-family sprinkler provision of R313.2 removed under the state's exemption. Section 12-402(B) rewrites the R105.2 list of work exempt from the permit requirement. Among the changes, the amendment states that the sidewalks and driveways exemption is deleted. Its mechanical-work list exempts replacement of an HVAC unit where heating and cooling capacity and fuel source are not changed, decks not exceeding 9 square feet in area that are not more than 30 inches above grade at any point, and roof covering replacement that does not involve the replacement of the roof deck or framing.

Sheds up to 32 square feet and fences not over 32 inches high are also exempt. Section 12-402(C) replaces R105.3.2: building permits expire 180 days after issuance unless voided for suspension, abandonment or failure to commence the work. The Building Official can extend the date by up to 180 days on written request showing circumstances beyond the applicant's reasonable control, and extensions are reported to the Board of Mayor and Aldermen monthly. After expiration, a new application is required. A permit issued under the old 365-day limit stays valid for its stated term, but extending it requires paying any fee or tax increases adopted since issuance. Under § 12-102, the Building Inspector of the City of Spring Hill administers the Building Code.