Alhambra, CA Building Safety: Fire Sprinkler Requirements (2026)

030(K). New construction gets a flat, occupancy-blind threshold: an automatic fire sprinkler system must be installed throughout all new buildings or structures exceeding 6,000 square feet in total fire area, with only open parking structures excepted. 1 and R-4 occupancies: any addition of 700 square feet or more of new fire area within a rolling 12-calendar-month period requires a retrofit of the whole structure, and so does any framing alteration or repair, within the same 12-month window, that touches more than 50% of the home's existing square footage, a calculation the fire code official applies to roof-structure framing work as well.

A combination of an addition and a framing alteration that together cross the 50% threshold in 12 months triggers the same requirement. 2, also locally amended, closes an obvious workaround: any sprinkler system installed voluntarily, even where not required, must be installed throughout the entire building, because partial installation of fire sprinkler systems is prohibited. Alterations to buildings other than one- and two-family dwellings face a parallel rule keyed to 50% of replacement cost rather than square footage.