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

040(A). Pre-manufactured homes are exempt outright. Repairing fire or other natural damage to an R3 home does not trigger the requirement unless the structure is demolished and rebuilt. But a residential addition that exceeds 50 percent of the existing structure's overall floor area requires sprinklers installed throughout the entire building, with a carve-out for additions built specifically to create an accessory dwelling unit. Local design add-ons layered onto the NFPA 13D standard include pilot heads in every roof pitch of a compartmentalized attic, a passive purge connection with CPVC piping run to the toilet stub-out, a spare sprinkler head box holding at least three heads plus a wrench, an exterior alarm bell on a dedicated, lockable circuit, sprinkler heads required under any stairwell containing a compartment or closet, and coverage for covered patios or California rooms with a permanently installed gas line.

070(F) requires a full NFPA 13 system, not NFPA 13D, in existing Group R1 and R2 buildings whenever a remodel's valuation exceeds 50 percent of the property's assessed value.