SF Soft Story Retrofit Program: what contractors need to know
The San Francisco Soft Story Retrofit Program is a mandatory seismic upgrade ordinance covering thousands of wood-frame multi-unit buildings across the city. It is one of the largest standing regulatory drivers of structural work in the SF market and a meaningful source of project leads for general contractors with engineered seismic experience and for foundation, framing, and concrete subs.
What is a soft story building?
A soft story building is a multi-story wood-frame structure where the ground floor is significantly weaker than the floors above. The typical case is a residential building with a tuck-under garage, an open retail bay, or a row of large windows at street level. Without interior shear walls at the ground floor, the building has no path to resist horizontal seismic forces, and the ground floor is prone to collapse in an earthquake.
Hundreds of soft story buildings collapsed in the 1989 Loma Prieta and 1994 Northridge earthquakes. San Francisco's ordinance is the city's response.
Which SF buildings need a retrofit?
The SF Soft Story Retrofit Ordinance applies to wood-frame residential buildings that meet all of the following:
- Five or more dwelling units
- Two or more stories above a soft, weak, or open-front ground story
- Building permit applied for before January 1, 1978
- Not previously retrofitted to the equivalent or higher standard
The Department of Building Inspection maintains a public list of properties subject to the ordinance. Properties on the list received a notice from the city and a compliance deadline by tier.
What does a soft story retrofit involve?
The retrofit upgrades the ground floor to resist seismic forces. Typical scope includes:
- Moment frames or shear walls. Engineered steel moment frames or plywood shear walls installed at the ground floor.
- Hold-downs and anchorage. Connecting new framing to the foundation and to the upper floor framing.
- Foundation upgrades. Sometimes new footings, sometimes epoxy anchors into existing foundation.
- Garage reconfiguration. Sometimes necessary to make room for shear walls, with implications for parking count.
- Architectural and accessibility upgrades. Triggered if the retrofit affects access paths.
Find SF soft story retrofit filings in real time
PermitPipeline tracks DBI filings daily. Filter by soft story or by parent properties on the compliance list.
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Costs vary widely. A typical small multi-unit retrofit runs $60,000 to $250,000. Larger buildings, hillside lots, garage reconfigurations, and projects that trigger accessibility upgrades run higher. Engineering and permits typically add 10 to 20 percent on top of construction cost.
The permit timeline runs 6 to 16 weeks for the retrofit-specific filing. Because the soft story track has a dedicated reviewer queue at DBI, it can sometimes move faster than a general alteration. Construction typically takes 8 to 16 weeks depending on scope.
What this means for general contractors
SF soft story retrofits are a recurring engineering-driven scope of work. Filings continue across the city as owners hit their deadlines, file extensions, or sell to investors who then retrofit. For a general contractor with structural retrofit experience or for a foundation, framing, or concrete sub, the soft story pipeline is a known stream of work that an owner-driven outreach motion can reach.
The owners are landlords. Many are non-professional building owners who do not have a long-standing GC relationship. Outreach at the time of soft story filing (not after issuance) tends to be the warmest window.
How to spot a soft story filing in DBI data
Soft story retrofits appear in DataSF building permit data with a few signature characteristics:
- Project description references seismic retrofit, soft story, or earthquake retrofit
- Permit type is typically a Building Alteration
- Property is on the DBI Soft Story Retrofit Program list (cross-reference)
- Structural engineer named on the filing
For deeper coverage of how SF DBI filings work, see our SF DBI permit types guide and the SF permit timeline article.