Marin County, CA Fire Regulations: Smoke Detectors (2026)

14 (Additional Verifications for Final Inspection), enacted by Ordinance No. 3788 in 2023 and since amended by Ordinance Nos. 2 as a local permit-closure requirement. The dollar threshold matters: the smoke alarm check attaches specifically to alterations or improvements to a dwelling unit valued at one thousand dollars or more, so a very small repair permit under that value does not by itself trigger the alarm verification, though it can still trigger the separate carbon monoxide and water-fixture checks in the same section if those conditions apply.

Once the threshold is met, the alarms installed must be approved by the State Fire Marshal, matching the statewide standard. 14: permits that required plan review get an in-person check from a Marin County Community Development Agency building inspector during final inspection, while permits that bypassed plan review (minor improvement or maintenance permits) are closed out on a signed affirmative declaration from the applicant, retained permanently in the permit file. The building inspector's approval of final inspection itself stands as the county's record of compliance on the plan-reviewed track.