Lehi, UT Building Safety: Fire Sprinkler Requirements (2026)

City Code section 10-3-1 finds that an automatic fire sprinkler system must be installed in structures built under the International Residential Code, as adopted in the state construction code, whenever any of six conditions applies. Condition A is location in an urban wildland interface area under the Utah Wildland Urban Interface Code that does not meet the minimum standards in Utah Code section 65A-8-203(3)(a) and Utah Administrative Code rule R652-122-200. Condition B is an area lacking a public water distribution system with fire hydrants meeting Utah Administrative Code rule R309-550-5.

Condition C is a fire apparatus access road with a grade over ten percent for more than five hundred continuous feet. Conditions D, E and F set minimum fire flow by house size: at least 500 gallons per minute for thirty minutes for homes up to 5,000 square feet, 750 gallons per minute for homes between 5,000 and 10,000 square feet, and 1,000 gallons per minute for homes over 10,000 square feet. 1 amendment in section 10-2-1(E), which independently requires sprinklers in new Dry Creek Corridor buildings needing Class 1 or Class 2 ignition-resistant construction; a home in that corridor can trigger both requirements at once.