City of Spring Hill, Tennessee - Building Codes and Inspection Department

City of Spring Hill, Maury and Williamson Counties, Tennessee

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Spring Hill, TN

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TWO CITY SOURCES GIVE DIFFERENT EDITIONS AND THIS ENTRY REPORTS BOTH RATHER THAN CHOOSING. The Building Codes and Inspection Department states on its own page that it "provides building inspection services to assure compliance with the 2018 International Residential Code." The adopting ordinance the same page links, however, is an ordinance amending Title 12 of the City Code to adopt the 2024 editions across the suite - the International Fire Code, International Building Code, International Plumbing Code, International Fuel Gas Code, International Mechanical Code and, at Title 12 Chapter 4 Section 12-401, the "International Residential Code for One and Two-Family Dwellings, 2024 Edition." Note that the document is captioned Ordinance 26-07 although the city's link labels it Ordinance 20-16, and that it is published as a scanned redline in which struck and inserted edition years sit side by side, so the edition text in the exhibit is not everywhere legible. Confirm which edition governs with the Building Codes Department before relying on any provision that changed between the two. The ordinance recites the state rule that produces this churn: the City "is required to adopt and enforce building, plumbing, gas, residential, mechanical, energy and fire codes that are within seven (7) years of the edition adopted by the State of Tennessee." ONE LOCAL ROOF REQUIREMENT APPLIES WHICHEVER EDITION GOVERNS, and it is unusual enough to plan around: among the city's further code modifications, "in R802.4.2, all primary roofline structure design shall maintain a minimum of 6:12 pitch, exclusive of dormers and porches, eaves and rakes shall have one foot minimum overhang."

Not required — Spring Hill imposes no impact-resistance or hail-rating requirement on roof coverings. The city's adopting ordinance and the exhibit carrying its residential code modifications were read in full - the permit exemption list, the twelve further code modifications and the seven additions, covering framing, foundations, fireplaces and chases, plumbing, insulation and roof pitch. They contain no reference to UL 2218, to FM 4473, or to a Class 4 or Class IV impact classification, and no requirement of that kind in any other wording.

Two layers maximum - one overlay is permitted, and a second existing layer requires a tear-off. THE EDITION QUESTION DESCRIBED IN THE ADOPTED CODE ENTRY DOES NOT AFFECT THIS ANSWER, WHICH IS WHY IT CAN BE STATED PLAINLY: the two candidate editions are the 2018 and the 2024 International Residential Code, and both bar a roof recover "where the existing roof has two or more applications of any type of roof covering" - the 2018 edition at section R908.3.1.1 and the 2024 edition in the Exceptions block closing section R908.4. The city's own modifications were read in full and amend the permit exemptions, wall and floor framing, foundation drainage, attic access, roof pitch, chimneys, insulation and the energy tables; none of them amends section R908 or any other part of the roof assemblies chapter. The other two bars apply whatever the layer count: a covering that is water soaked or has deteriorated to the point that it is not an adequate base for additional roofing, and a covering of slate, clay, cement or asbestos-cement tile.

9.75% in the City of Spring Hill - the 7% Tennessee state sales tax plus the 2.75% local tax levied by the county the address sits in. Tennessee sets the state rate and lets each county or incorporated city levy its own local tax on top: the Department of Revenue states that "any county or incorporated city, by resolution or ordinance, may levy the local sales and use tax on the same privileges that are subject to the state's sales or use tax," and that "the local tax rate may not be higher than 2.75% and must be a multiple of .25." THAT CAP IS WHY A CITY RATE IS NOT ADDED TO ITS COUNTY RATE: several Tennessee cities levy the full 2.75% while sitting in a county that levies less, and stacking the two would exceed the statutory maximum. Where an incorporated city has its own rate, that rate is the local rate inside the city; where it has none, the county rate applies. The figures here are from the Department of Revenue's own machine-readable rate file for the third quarter of 2026, which the Department publishes for use in tax calculation applications. SPRING HILL LIES IN TWO COUNTIES AND THE ANSWER IS STILL ONE RATE. The city spans Maury and Williamson counties, and it levies no separate municipal sales tax - it has no entry of its own in the Department of Revenue rate file - so the county rate applies. Both counties levy 2.75%, the statutory maximum, so the combined rate is 9.75% on either side of the county line and a roofer does not need to establish which county a particular address sits in for sales tax purposes. Contrast Kingsport, which also spans two counties but whose two counties levy different rates.