San Diego County, CA Fire Regulations: Smoke Detectors (2026)

Smoke alarm requirements in the unincorporated area are set by the 2022 California Residential Code (CRC) Section R314, adopted by reference into San Diego County Code Title 9 (Building Regulations) and enforced by the County of San Diego Department of Planning and Development Services Building Division. CRC R314.1 requires smoke alarms to comply with NFPA 72 and be listed in accordance with UL 217. CRC R314.3 specifies installation locations: in each sleeping room; outside each separate sleeping area in the immediate vicinity of bedrooms; and on each additional story of the dwelling, including basements and habitable attics (excluding crawl spaces and uninhabitable attics). CRC R314.4 requires interconnection so that activation of one alarm activates all alarms in the unit, audible in all bedrooms over background noise with intervening doors closed. CRC R314.6 requires alarms in new construction to receive primary power from the building wiring (commercial source) with battery backup. CRC R314.2.2 requires existing dwellings to be retrofitted with smoke and carbon monoxide alarms when a building permit is issued for alterations, repairs, or additions exceeding $1,000 - battery-only alarms are permitted in retrofits where no interior wall or ceiling finishes are removed. California Health and Safety Code Section 13113.7 requires smoke alarms in every dwelling intended for human occupancy. Section 13113.8 requires sellers of single-family dwellings (including one- or two-unit dwellings, excluding manufactured homes and mobilehomes) to deliver a written statement of compliance to the buyer prior to transfer of title; the exclusive remedy for non-delivery is actual damages up to $100. Tenant-occupied rentals: the property owner is responsible for installing and maintaining smoke alarms; tenants must notify the owner of inoperability under Health and Safety Code Section 13113.7. In Wildland-Urban Interface (WUI) areas of the County (designated under CRC R327 / California Fire Code Chapter 49), smoke alarm rules are unchanged but additional ignition-resistant construction and defensible-space rules apply.