Chattanooga, TN Building Safety: Fire Sprinkler Requirements (2026)
Key Facts
- Townhouse sprinklers
- R313.1 deleted, no mandate
- 1-2 family sprinklers
- R313.2 deleted, no mandate
- 3-4 family size cap
- Under 5,000 square feet
- 3-4 family height cap
- Under 3 stories
- Fire-rating condition
- 2-hour wall/floor/ceiling separation
Summary
Chattanooga deleted the IRC's mandatory sprinkler sections for townhouses and one- and two-family homes, and also exempts smaller three- and four-family buildings that meet a fire-rating standard.
Section R313.1 Automatic Fire Sprinkler Systems for Townhouses is deleted in its entirety... Section R313.2. One and Two Family Dwelling Automatic Fire Systems is deleted in its entirety... The state fire marshal and local building officials shall not mandate automatic fire sprinkler systems for three-family dwellings and four-family dwellings where structures are under five thousand (5,000) square feet in area and less than three (3) stories in height and where two-hour fire-resistance-rating for wall, floor, and ceiling separation assemblies is met.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 40 Update 1).
Full Breakdown
City Code § 10-3 amends the 2018 International Residential Code by deleting Section R313.1 (townhouse automatic fire sprinkler systems) and Section R313.2 (one- and two-family dwelling automatic fire systems) in their entirety, so no local sprinkler mandate applies to those unit types. For three- and four-family dwellings, the state fire marshal and local building officials may not mandate automatic sprinkler systems where the structure is under 5,000 square feet, less than three stories, and meets a two-hour fire-resistance rating for wall, floor, and ceiling separation assemblies between units.
Violations & Fines
No local sprinkler mandate applies to qualifying homes and small multi-family buildings; structures that exceed the 5,000-square-foot, three-story, or two-hour fire-rating thresholds fall back under standard code sprinkler requirements enforced through the permit process.
Frequently Asked Questions
Does Chattanooga require fire sprinklers in new homes?
Are triplexes and fourplexes exempt too?
Sources & Official References
Other rules in Chattanooga
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