Are There Specific Regulations for Soft-Story Retrofits in the San Francisco Area?
Short answer: yes. In San Francisco and the surrounding Bay Area cities, soft-story retrofits aren’t just “good ideas” – for many multi‑unit buildings they’re written into law.
This article gives you the owner‑level version: what’s required in San Francisco, what’s happening in nearby cities, and what it means if you own a soft‑story building or a living‑over‑garage home.
For a deeper dive on risk and costs, start here:
Bay Area Soft-Story Homes: Why You Must Retrofit Now to Avoid $150,000+ in Earthquake Losses
1. What Counts as a “Soft-Story” Building?
In the Bay Area, “soft story” usually means:
- Wood‑frame building
- Upper stories with lots of walls and small rooms
- Ground floor that’s mostly open (tuck‑under parking, big garage doors, large shop windows)
- The lowest story is much weaker and more flexible than the one above
That weak ground story is where buildings collapsed in past quakes like Loma Prieta and Northridge.
If your building has parking or big openings at the ground level and was built before 1990, you’re probably in the soft‑story risk category. More on how we retrofit those here:
Soft-Story Retrofits
2. San Francisco’s Mandatory Soft-Story Retrofit Program (MSSP)
San Francisco has a Mandatory Soft Story Retrofit Program for certain multi‑unit buildings. In plain language, it targets:
- Wood‑frame buildings
- With 5 or more dwelling units
- Three or more stories, or two stories over a basement/underfloor area that extends above grade
- Built under permits dated before January 1, 1978
- With no prior seismic strengthening
If your building fits that profile, you’re not just “allowed” to retrofit – you’re on the City’s list and expected to meet specific screening, design, and construction requirements and close out permits.
Owners who don’t comply can face:
- Notices of violation
- Fines and enforcement under the SF Building Code
- “Earthquake Warning” placards posted on the building
The details, deadlines, and enforcement are all handled through the Department of Building Inspection.
If you already have plans or are comparing bids under this program, we can help you sort them out:
Plan Review, Value Scope & Bidding Support
3. Other Bay Area Cities With Soft-Story Ordinances
San Francisco is not alone. Other Bay Area jurisdictions have their own soft‑story rules for multi‑unit wood‑frame buildings, including:
- Oakland and Berkeley (older ordinances focused on multi‑unit soft‑story apartments)
- San Jose, with a new program that brings in many 3–4‑unit buildings and sets screening and retrofit deadlines by group
For San Jose’s specifics (groups, deadlines, and building definitions), see:
San Jose Soft-Story Retrofit Ordinance: What Owners Need to Know (and How to Prepare)
Each city defines:
- Which buildings are “subject”
- What standards designs must meet
- Deadlines for screening, permitting, and construction
- How compliance is documented and enforced
If your building has tuck‑under parking or big ground‑floor openings, assume you’re in the target audience until an engineer or experienced contractor proves otherwise.
4. What About Single-Family “Living Over Garage” Homes?
Most single‑family and small condo soft‑story homes (living space over a garage) in the Bay Area are not under a mandatory ordinance yet.
That does not mean they’re safe; it just means:
- The city isn’t forcing you (yet)
- Earthquakes don’t care what zoning you’re in
For these homes, retrofits are usually voluntary, but the risk and failure mode are the same as multi‑unit buildings: weak garage level, stiff upper floors.
If this sounds like your house, read this first:
Bay Area Soft-Story Homes: Why You Must Retrofit Now to Avoid $150,000+ in Earthquake Losses
5. Code Standards Behind Soft-Story Retrofits
Under SF and other city programs, soft‑story retrofits must comply with:
- The local building code (California Building Code as amended locally)
- Specific guidance for existing soft‑story wood‑frame buildings (often based on FEMA / CEBC provisions)
- City‑approved engineering design and permitting
Practically, that means you’ll see:
- Steel moment frames or
- New/strengthened wood shear walls, or a combination
- New foundations/grade beams under those frames/walls
- Upgraded connections between floors, walls, and foundations
In many Bay Area projects, designs lean on concepts from FEMA P‑1100‑2B for living‑over‑garage conditions, then adapt them to the specific building and local ordinance.
We live in that intersection every day:
Soft-Story Retrofits
ESS Retrofits (Earthquake Soft-Story Retrofits)
6. How to Move From “Regulations” to a Concrete Plan
If you own a soft‑story building in the San Francisco area, here’s the order that actually works:
- Confirm if you’re in a program
- Check city notices and jurisdiction maps
- Ask your engineer or a contractor who knows these ordinances
- Get a real field assessment
- Document foundations, framing, utilities, access, and tenant/parking realities
- Support your engineer with actual site data, not guesses
- Have an engineer design to the ordinance and your building
- No one‑size‑fits‑all frames dropped into every opening
- Make sure designs are buildable in your specific conditions
- Choose a contractor who has lived through these programs
- Someone who understands both code compliance and operations (tenants, parking, disruption)
That is exactly how we structure soft‑story work in the Bay Area:
Soft-Story Retrofits
If you already have plans or a city letter and want a second set of eyes before you commit to a six‑figure project, start here:
Plan Review, Value Scope & Bidding Support
