San Francisco's Earthquake Safety: The Rules That Matter

Every city handles earthquake safety a little differently. In San Francisco, California, there are 4 distinct rules that residents and property owners should be aware of. Some are stricter than what neighboring cities enforce, and others are more relaxed. Here is what you need to know.

Seismic Gas Shutoff

California law requires seismic gas shutoff valves on new construction and major renovations. San Francisco follows state requirements under California Health and Safety Code Sections 19200-19204. Valves automatically close the gas supply during earthquakes to prevent fires.

Key details: State Law: CA H&S Code 19200-19204. Standard: CRSC 12-12-1. New Construction: Required at gas meter. Existing Buildings: Required on major renovation. Trigger Level: Typically 5.1+ magnitude.

New construction without required seismic gas shutoff valves will not pass final inspection. Failure to install during required trigger events may result in code compliance orders from DBI.

Soft-Story Retrofit

San Francisco's Mandatory Seismic Retrofit Program (Ordinance 66-13, signed April 2013) requires seismic strengthening of wood-frame soft-story buildings with 5+ units built before 1978. All building tiers had compliance deadlines that passed by September 2021. Non-compliant buildings face escalating penalties.

Key details: Ordinance: 66-13 (April 2013). Building Type: Wood-frame, 5+ units, pre-1978. Buildings Affected: ~4,900 identified. Compliance Deadline: All tiers passed (Sep 2021). Origin: 1989 Loma Prieta lessons.

Non-compliant buildings face escalating penalties, potential condemnation, and restrictions on sale or refinancing. DBI may issue Notices of Violation and require compliance before issuing other building permits.

This is not one of those rules that cities tend to ignore. San Francisco actively enforces its soft-story retrofit requirements.

Unreinforced Masonry

San Francisco Ordinance 225-92 mandated seismic retrofit of approximately 2,000 unreinforced masonry buildings. Voters approved $350 million in bonds for low-interest loans to building owners. Over 95% of identified UMBs have been retrofit or demolished as of 2014.

Key details: Ordinance: 225-92 (July 1992). Buildings Identified: ~2,100 URM buildings. Bond Measure: $350 million approved. Compliance Rate: Over 95% (as of 2014). Retrofit Standards: SFBC Chapters 16B and 16C.

Non-compliant URM buildings face Notices of Violation, increasing penalties, potential condemnation, and restrictions on occupancy. DBI tracks compliance status.

Compared to other cities, San Francisco takes a harder line on unreinforced masonry. The enforcement and penalty structure reflects that.

Foundation Anchoring

San Francisco encourages foundation anchoring (bolting) for older wood-frame homes to prevent earthquake damage. Foundation bolts anchor the wooden structure to its concrete foundation, and cripple wall bracing prevents collapse. The city offers expedited permit processing for voluntary seismic upgrades.

Key details: Method: Mudsill bolting + cripple wall bracing. Target: Pre-1940 wood-frame homes. Permit: Standard plan (over-the-counter). Grant Program: Earthquake Brace + Bolt (up to $3,000). Code: CRC Section R403.1.6 (new construction).

Foundation anchoring is generally voluntary for existing buildings. However, during major renovations or additions, DBI may require seismic upgrades. Failure to comply with permit conditions during renovation may result in stop-work orders.

The Bottom Line

San Francisco is tougher than many cities when it comes to earthquake safety. Out of the 4 rules covered here, 2 are rated strict. If you are a homeowner, renter, or business owner in San Francisco, take the time to understand these requirements before they become a problem. Most violations come with fines, and some repeat violations can escalate.

Keep in mind that San Francisco can amend these rules at any council meeting. For the most current version of any rule mentioned here, check the specific ordinance page, where we track updates as they happen.