Redwood City, CA Building Safety: Fire Sprinkler Requirements (2026)
Key Facts
- Applies to
- All new R-3 (single-family) homes
- Standard
- CRC §§ R313.1/R313.2, Fire Code §903.3.1.3
- Coverage area
- Garages, carports, attached structures
- Retrofit trigger
- 1,000+ sq ft addition or 50%+ foundation/framing
- Multifamily (R-1/R-2)
- 4 stories or less, Fire Code §903.3.1.2
Summary
Redwood City's locally amended Fire Code requires an automatic fire sprinkler system in every new single-family home (Group R-3) built in the city, installed to the 2025 California Residential Code's R313.1/R313.2 standards and covering attached garages and carports. New duplexes and apartments (R-1/R-2) face the same mandate under a companion section.
903.2.8(b) New R-3 Occupancies. An approved automatic fire sprinkler system shall be installed as per Sections R313.1 and R313.2 of the 2025 California Residential Code. Installation of the automatic fire sprinkler system shall be in accordance with Section 903.3.1.3 of the fire code and with the following areas of the residence to be protected by automatic fire sprinklers: 1. Sprinklers shall be installed throughout garages, carports, and similar attached structures.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Zoning Code: Supplement 29 | City Code: Supplement 61 Update 1).
Full Breakdown
8(a) and (b) to the Fire Code. 2, extending coverage into garages, open attached porches, carports and large combustible under-floor storage areas. 2. 22) extends the mandate further: every new one- or two-family dwelling and any new building of 3,000 square feet or more needs sprinklers, and an attached accessory dwelling unit must be sprinklered if the main structure already has, or is required to have, sprinklers. Existing one- and two-family homes are pulled in too if they add 1,000 square feet or more, replace over 50 percent of the foundation, or replace over 50 percent of the framing above the sill plate, whether in one project or cumulatively within five years.
Any other existing building that grows to 3,000 square feet total, undergoes a 'substantial remodel,' or changes to a more hazardous occupancy group must add sprinklers as well. 1.
Violations & Fines
Building permits for covered new construction, additions, or substantial remodels are conditioned on installing the required sprinkler system; the fire code official can withhold occupancy approval until the system is installed and tested to the applicable Fire Code standard. Because section 903.2.8(b) carries no standalone fine, a violation falls under Redwood City Code section 1.7's general penalty: a misdemeanor punishable by up to $1,000 in fines, six months in jail, or both.
Frequently Asked Questions
Do all new houses in Redwood City need fire sprinklers?
Does my existing house have to be retrofitted with sprinklers?
Do accessory dwelling units need their own sprinklers?
Sources & Official References
Other rules in Redwood City
California rules heatmap·Compare Redwood City to another location·View the California building safety overview
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