San Rafael, CA Building Safety: Fire Sprinkler Requirements (2026)
Key Facts
- New homes
- Sprinklers required, one/two-family
- New townhouses
- Sprinklers required (R309.1)
- Existing homes
- Required on 'substantial remodel'
- Threshold
- Over 50% floor area affected
- Base code
- State Residential Code, locally amended
Summary
San Rafael's Residential Code amendment requires automatic fire sprinklers in every newly built one- and two-family home and townhouse, and in existing ones undergoing a 'substantial remodel' within any three-year span.
R309.2 One-and two-family dwellings automatic fire systems. An Automatic residential fire sprinkler system shall be installed in all newly constructed one-and two-family dwellings and in existing one-and two-family dwellings where alterations and/or additions to the existing structure, performed over any 3-year period, qualify as a "Substantial Remodel" as defined in this code. Any addition to a building with an existing fire sprinkler system shall have that system extended to the new portions of the building, irrespective of the size of the addition.
R309.2.1. [Unchanged]
Amend Section R309.3.1.2 by deleting exception #4.
Amend Section R310.7.2 by adding the following:
Smoke alarms shall be tested and maintained in accordance with the manufacturer's instructions. Smoke alarms that no longer function shall be replaced. Replacement of an existing smoke alarm that is hardwired and/or interconnected shall be made with an alarm of the same functionality.
Amend Section R902.1.1 to read as follows:
R902.1.3 Roofing requirements with Fire Hazard Severity Zones or a Wildland-Urban Interface (WUI) area. Roofing requirements for structures located within Fire Hazard Severity Zones or in a Wildland-Urban Interface (WUI) area shall be a fire-retardant roof covering that is at least Class A and shall also comply with Part 7, California Wildland-Urban Interface Code.
Amend Section R902.1.2 to read as follows:
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 37).
Full Breakdown
California's base Residential Code already requires sprinklers in new one- and two-family homes; San Rafael's local amendment at SRMC § 12.255.020 goes further. Amended Section R309.2 mandates an automatic residential fire sprinkler system in every newly constructed one- and two-family dwelling and, separately, R309.1 requires the same for newly constructed townhouses. For existing homes and townhouses, sprinklers are required retroactively whenever alterations or additions performed within any three-year period meet the code's definition of a 'Substantial Remodel': more than 50% of the existing floor area affected. Any addition to a building that already has sprinklers must have the system extended to the new space, regardless of the addition's size.
Violations & Fines
Building without required sprinklers blocks final inspection and occupancy approval; violations of the adopted Residential Code are enforced as building code violations under SRMC Title 12 and Chapter 1.40.
Frequently Asked Questions
Do I need fire sprinklers to build a new house in San Rafael?
Does remodeling my existing San Rafael home trigger a sprinkler requirement?
Sources & Official References
Other rules in San Rafael
California rules heatmap·Compare San Rafael to another location·View the California building safety overview
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