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

Section 9.42.080(H) sets the smoke alarm standard for permitted short-term rentals: alarms in good working order, installed in accordance with the California Building Code, with a minimum of one in each bedroom and at least one on every level of the unit, including basements and habitable attics. This STR-specific rule sits alongside the county's separate carbon monoxide alarm requirement at Section 9.42.080(I), which mandates CO alarms outside each bedroom and on every level, and the fire extinguisher requirement at Section 9.42.080(J). Compliance is not just a paperwork promise: Section 9.42.050(B)(9) and (10) require the initial STR permit application to list the number and location of smoke alarms and to include a passing fire-life safety inspection, and Section 9.42.080(L) requires fire district staff to re-inspect for smoke alarm compliance, among other items, once every three years or on request.

A fire-life safety inspection that fails twice within a 12-month period results in denial of the STR application under Section 9.42.050(B)(10). Because this smoke alarm rule is written into the STR operational standards article rather than the county's general building code chapters, it applies specifically to permitted rental units in the Eastern Placer County Short-Term Rental Area; the county's building code adopts the California Residential Code for construction generally at Section 15.04.330, but this file does not print a standalone county amendment to the Residential Code's own smoke alarm chapter for owner-occupied homes outside the STR program.