San Diego County, CA Fire Regulations: Smoke Detectors (2026)
Key Facts
- Applies to
- Mid-rise buildings, 4+ stories, under 75 ft
- Requirement
- Smoke detectors wired to fire alarm system
- Standard
- Installed per NFPA 72 edition
- Jurisdiction
- Unincorporated San Diego County only
- Citation
- County Fire Code § 96.1.324
Summary
In unincorporated San Diego County, newly constructed or fully renovated mid-rise buildings (4 or more stories, up to 75 feet) must install smoke detectors wired into the building's automatic fire alarm system.
Sec. 324.1.2 Smoke detection. Smoke detectors shall be provided in accordance with this section. Smoke detectors shall be connected to an automatic fire alarm system and shall be installed in accordance with the NFPA 72 edition as referenced in Chapter 80 of CFC... Smoke detectors shall be located as follows: 1. In every mechanical equipment, electrical, transformer, telephone equipment, unmanned computer equipment, elevator machinery or similar room and in all elevator lobbies.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-141: Administrative: Current through Ord. No. 11007 (N.S.), effective 7-10-26 | Regulatory: Current through Ord. No. 11008 (N.S.), effective 7-24-26).
Full Breakdown
San Diego County's Fire Code amendments add Section 324 for mid-rise buildings: those four stories or higher but under 75 feet and not classified high-rise under California Building Code § 202. Sec. 324.1.2 requires smoke detectors connected to an automatic fire alarm system, installed to NFPA 72 standards, in every mechanical, electrical, transformer, telephone and elevator machinery room, all elevator lobbies, the main return/exhaust air plenum, and multi-story duct risers, plus Group R-1/R-2 corridors serving 10 or more occupants. This applies only in unincorporated county territory, not inside the City of San Diego or the county's 17 other incorporated cities, which enforce their own fire codes.
Violations & Fines
Violating mid-rise smoke detection requirements is enforced as a County Fire Code infraction or misdemeanor, fined up to $1,000 or six months in county jail; each day of non-compliance is a separate offense.
Frequently Asked Questions
Does this smoke alarm rule apply to my single-family house in unincorporated San Diego County?
Where must smoke detectors be installed in a mid-rise building?
What triggers the requirement?
Sources & Official References
Other rules in San Diego County
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