Perris, CA Building Safety: Fire Sprinkler Requirements (2026)
Key Facts
- New construction
- Sprinklers required, all new homes
- ADUs
- Sprinklers required, § 16.08.051B
- Addition trigger
- 33%+ of area, over 1,000 sq ft
- Governing section
- § 16.08.051B (CRC R309.1)
Summary
Perris requires automatic fire sprinklers throughout new townhouses and accessory dwelling units, plus major additions to existing homes, under a local amendment to the California Residential Code.
R309.1 Townhouse automatic fire sprinklers systems. An automatic residential fire sprinkler system shall be installed in Townhouses as follows: New buildings: An automatic sprinkler system shall be installed throughout all new buildings, and Accessory Dwelling Units. Existing buildings: An automatic sprinkler system shall be installed throughout when ... an addition is 33% or more of the existing building area ... and greater than 1,000 square feet ... within a two-year period.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 13).
Full Breakdown
Perris Municipal Code § 16.08.051B rewrites California Residential Code Section R309.1, mandating an automatic residential fire sprinkler system throughout every new townhouse and accessory dwelling unit built in the city. A parallel rewrite of Section R309.2 extends the same new-construction sprinkler mandate to one- and two-family dwellings generally. Existing buildings must add sprinklers throughout when an addition reaches 33% or more of the existing building area and exceeds 1,000 square feet within a two-year period, when an addition is made to a building that already has sprinklers, or when a remodel is extensive enough that the Building Official finds it comparable to new construction.
Violations & Fines
Building or substantially remodeling a covered home without installing the required sprinkler system violates § 16.08.051B and can block permit final and certificate of occupancy until corrected.
Frequently Asked Questions
Do new accessory dwelling units in Perris need fire sprinklers?
When must an existing Perris home add sprinklers?
Sources & Official References
Other rules in Perris
California rules heatmap·Compare Perris to another location·View the California building safety overview
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