San Francisco Soft-Story Retrofit — Tier I-IV Compliance + $60K-$150K Cost

If your wood-frame building has a ground-floor garage and sits on a 1978-or-earlier permit, the retrofit is not optional. It is already overdue.

What "soft-story" actually means — the physics

A soft-story building is a wood-frame structure in which the ground floor is substantially weaker and more flexible than the residential floors stacked above it. In San Francisco, that weakness is almost always caused by the same architectural feature: a large open ground level built for retail, tuck-under parking, or a roll-up garage door, with two, three, or four residential stories carried on top. The open walls are what makes that first story "soft." There are no shear walls doing the work that the walls above are doing.

Under horizontal seismic load, the first story is the level that fails. Engineers call it a weak-story collapse, and the failure mode is brutally consistent: the ground floor racks sideways, the building rotates about the weak level, and the residential floors pancake down onto whatever was parked or sold at street level. You can still see photo documentation of this failure pattern from Loma Prieta in 1989 in the Marina District and from Northridge in 1994 at the Northridge Meadows apartments, where 16 residents died in a single three-story wood-frame building with a tuck-under garage.

San Francisco inventoried roughly 4,400 buildings that fit this profile — wood-frame, five or more residential units, two or more stories above a weak ground level, permitted before 1978. The Community Action Plan for Seismic Safety (CAPSS), adopted by the Board of Supervisors in 2012 and codified in 2013, concluded that these buildings collectively house more than 58,000 San Franciscans and represent the single largest preventable source of life-safety loss in the next major Bay Area earthquake. The mandatory retrofit ordinance is the direct outcome of that work.

Who is required to retrofit — the four criteria

A building is a "covered building" under the 2013 Mandatory Soft-Story Ordinance (Chapter 34B of the San Francisco Building Code) only if all four of the following are true:

• Wood-frame construction. Concrete, steel, and masonry buildings are regulated under different SF ordinances (URM, non-ductile concrete) and are not covered here.
• Five or more residential units. Four-unit buildings and single-family-with-in-law configurations are excluded.
• Two or more stories above a soft, weak, or open-front first story. A "soft" story typically means the ground level has less than half the lateral stiffness of the story above.
• Permit of original construction issued before January 1, 1978. Buildings permitted in 1978 or later were built under a code that already required adequate first-story shear.

Within those four criteria, the San Francisco Department of Building Inspection (DBI) sorted every covered building into four tiers based on occupancy and unit count, and each tier carried its own hard deadline:

• Tier I — buildings with A (assembly), E (education), or R-2.1 (residential care) occupancies on the ground floor. Highest-risk mixed-use. Deadline: September 15, 2017.
• Tier II — buildings with 15 or more residential units. Deadline: September 15, 2018.
• Tier III — buildings with 5 to 14 residential units (no ground-floor A/E/R-2.1 occupancy). Deadline: September 15, 2019.
• Tier IV — all remaining covered buildings, including those containing ground-floor retail without A/E/R-2.1 classification. Deadline: September 15, 2020.

Every tier deadline has passed. If your building is covered and has not filed proof of compliance with DBI, you are not "getting around to it." You are in active enforcement and have been for multiple years. See the Earthquake Safety Implementation Program (ESIP) soft-story page at sfgov.org for the current non-compliance list.

The three retrofit approaches

Not all retrofits cost the same, because not all buildings qualify for the cheapest engineering path.

1. Prescriptive path. Most common, typical cost $60,000 to $100,000 for a building under 20,000 square feet. This uses DBI's pre-engineered prescriptive standards published under Administrative Bulletin AB-107. A licensed structural engineer still signs the drawings, but the design follows a cookbook: steel moment frames at the front garage opening, plywood shear walls tied to new foundation hold-downs at the building corners, Simpson Strong-Tie hardware at every framing tie, and anchor bolts epoxied into the existing perimeter foundation. Construction is four to eight weeks and tenants usually stay in place.

2. Engineered alternative. Typical cost $80,000 to $150,000. Required when the building falls outside the prescriptive envelope — irregular footprint, shared party walls, cripple-wall conditions, multiple soft stories, or a ground floor too open for the prescriptive moment-frame solution. Uses ASCE 41 "Seismic Evaluation and Retrofit of Existing Buildings" as the analysis standard. The engineer of record models the building in software, establishes a target performance level (usually Life Safety at the BSE-1E hazard level), and designs specific interventions. Plan-check takes longer because DBI's plan reviewer has to read calculations, not just verify a cookbook.

3. Performance-based design. Typical cost $120,000 to $200,000+. Reserved for mixed-use buildings with historic designation, unusually tall soft-story configurations, or owners who want a higher performance target (Immediate Occupancy). Uses nonlinear pushover or time-history analysis. Rare. If your building needs this path, you are not shopping on price.

The cheapest legal retrofit is the one that qualifies for the prescriptive path. A competent SF soft-story structural engineer will tell you in the first site visit which path your building can use, and you should get that determination in writing before you sign any GC contract.

The ESIP enforcement pathway

When a covered building misses its tier deadline, DBI follows a four-step enforcement sequence documented on the ESIP soft-story program page:

1. Notice of Violation (NOV) issued under Chapter 34B. Recorded against the property. Gives the owner 30 days to come into compliance or file a compliance plan.
2. Director's Hearing. If the NOV is ignored, DBI holds an administrative hearing and issues an order.
3. Order of Abatement + lien. DBI records a lien on the property title for the cost of an anticipated city-ordered retrofit plus administrative penalties. The lien blocks refinance. It does not block sale, but the title company will require escrow to fund full compliance before closing.
4. Referral to City Attorney. The City of San Francisco can pursue civil penalties under San Francisco Building Code Chapter 34B Section 604. Penalties accrue daily.

As of 2026, DBI has recorded more than 200 liens against non-compliant soft-story buildings and has referred several to the City Attorney's office. Sale of a non-compliant building is the most common trigger for owners who had been sitting on unresolved NOVs — the escrow check cannot close with the lien in place.

Rent Ordinance constraint — you cannot pass the cost to tenants

This is the part that catches new out-of-state landlords by surprise. San Francisco's Residential Rent Stabilization and Arbitration Ordinance (the "Rent Ordinance"), Section 37.9, governs capital improvement pass-throughs. A landlord who performs voluntary capital improvements can petition the Rent Board to amortize a portion of that cost into tenant rent.

Mandatory seismic retrofits are explicitly excluded from the capital-improvement pass-through. The San Francisco Rent Board's Regulation 7.16 bars pass-through of any work the city requires the owner to perform. The soft-story retrofit is required. The landlord pays 100% of the retrofit cost. No rent increase is permitted to recover it.

Temporary tenant displacement during retrofit is also regulated. If the retrofit requires temporary vacancy (uncommon for prescriptive-path work, sometimes required for engineered alternative work that touches interior walls), the owner must follow Section 37.9(a)(11) procedures: written notice, relocation payment set annually by the Rent Board (currently around $7,500 per tenant with adjustments for elderly, disabled, and minor occupants), and a guaranteed right of reoccupancy at the prior rent. The landlord cannot use the retrofit as a pretext for permanent eviction or rent reset.

Timeline — six to twelve weeks construction, four to eight weeks plan-check

A typical prescriptive-path SF soft-story retrofit moves through three phases:

• Design and plan-check: four to eight weeks at DBI. Your structural engineer submits drawings through DBI's Permit Tracking System. Plan-check is handled by the DBI Structural Plan Check Division. Over-the-counter review is available for straightforward prescriptive-path submittals that include all required AB-107 details. Integrated electrical and mechanical scope, if any, runs concurrently.
• Construction: four to eight weeks. Longer for occupied buildings where the GC cannot work from a fully open ground floor. Work almost always includes: demo of existing ground-floor drywall and non-structural partitions, installation of new anchor bolts and hold-down hardware, erection of steel moment frames at the garage opening, sheathing of new plywood shear walls, and reinstatement of finishes.
• Final inspection and recording: one to two weeks. DBI inspector verifies the work matches the stamped drawings. A Certificate of Final Completion is issued. The owner files proof of compliance with ESIP and the NOV, if one was recorded, is released.

Why Baily matches one CSLB B contractor with 10+ soft-story retrofits

Baily is not a lead-generation platform. For a compliance-mandated structural project where the owner's title is on the line, matching three or four GCs is malpractice. Baily matches exactly one Certified Partner GC, and for SF soft-story retrofits the match filter is specific:

• Active California CSLB B (General Building) license — verified on the CSLB contractor lookup at the time of match.
• Minimum 10 closed SF soft-story retrofits in the past 36 months, confirmed via DBI permit history.
• $1M or higher general liability, active, with SF as covered territory.
• Licensed California Professional Engineer (structural discipline) on the GC's regular design panel — soft-story work cannot proceed without a wet-stamped SE.
• Section 37.9 Rent Ordinance experience if the building is occupied. This matters — a GC who has never sequenced work around tenant noise-hour restrictions will overrun the schedule.

The Better Business Bureau SF rating and recent SF DBI complaint history are reviewed on every match. If the partner GC loses any of these conditions, Baily's match pool rejects them on the next scheduled sync.

Frequently asked questions

Is my San Francisco building subject to the soft-story retrofit ordinance?

Your building is a covered "soft-story" building under Chapter 34B of the SF Building Code if all four of these are true: it is wood-frame construction, contains five or more residential units, has two or more stories above a soft or weak or open-front first story (typically a tuck-under garage or ground-floor retail), and was permitted for original construction before January 1, 1978. You can confirm coverage by looking up your property on the ESIP building list, which DBI publishes and updates. If your building is on that list and you have not filed proof of compliance, you are already out of deadline. Concrete, steel, and masonry buildings are regulated under separate ordinances (URM and non-ductile concrete) and are not part of this program. Single-family homes and buildings with four or fewer units are not covered.

What does a soft-story retrofit actually cost in SF in 2026?

For a typical wood-frame building under 20,000 square feet that qualifies for the prescriptive-path design under DBI Administrative Bulletin AB-107, expect $60,000 to $100,000 total — inclusive of structural engineering, DBI plan-check fees (roughly $3,000 to $8,000 on a typical job), steel moment frame material, plywood sheathing, Simpson Strong-Tie hardware, anchor bolt installation, and finish restoration. Buildings that require the engineered alternative path under ASCE 41 run $80,000 to $150,000 because the design effort is higher and the intervention is building-specific rather than cookbook. Performance-based design, which is rare and usually only seen on historic mixed-use or unusually tall soft-story configurations, runs $120,000 to $200,000 or more. Get the path determination in writing from the structural engineer before signing a GC contract — the cheapest legal retrofit is always the one that qualifies for AB-107 prescriptive, and a competent engineer will tell you that on the first site visit.

Can I pass the retrofit cost through to my tenants?

No. San Francisco Rent Board Regulation 7.16 excludes mandatory seismic retrofits from the capital-improvement pass-through rules in Section 37.9 of the Rent Ordinance. Because the soft-story retrofit is required by Chapter 34B of the SF Building Code, the landlord absorbs 100% of the cost and no rent increase is permitted to recover it. If the retrofit requires temporary tenant displacement (uncommon for prescriptive-path work), the owner must follow Section 37.9(a)(11) procedures, which include written notice, a relocation payment set annually by the Rent Board and currently around $7,500 per tenant with adjustments for elderly, disabled, and minor occupants, and a guaranteed right of reoccupancy at the prior rent. Attempting to use the retrofit as a pretext for eviction or rent reset is a Rent Board violation and exposes the owner to civil penalties and wrongful-eviction claims.

What happens if I missed my tier deadline?

You are in the ESIP enforcement pipeline. DBI's sequence under Chapter 34B Section 604 is: a recorded Notice of Violation against the property giving you 30 days to come into compliance or file a compliance plan, followed by a Director's Hearing if the NOV is ignored, followed by an Order of Abatement with a lien recorded on the title for anticipated city-ordered retrofit cost and administrative penalties, followed by referral to the City Attorney for civil penalties that accrue daily. The lien blocks refinance. Sale is still possible but the title company will require escrow to fund full retrofit compliance before closing, which is why sale is the single most common trigger for owners to finally break ground. As of 2026, DBI has recorded over 200 liens against non-compliant buildings and has referred multiple cases to the City Attorney. The longer you wait, the higher the accrued penalties. The ESIP soft-story page publishes the current non-compliance list.

How do I find a soft-story retrofit contractor who knows SF DBI prescriptive guidelines?

Start with three verifications, in this order. One, confirm active California CSLB B (General Building) license on the CSLB contractor lookup — not a B-2, not a C-50 framing sub, a full B. Two, confirm the GC has closed at least 10 SF soft-story retrofits in the past 36 months by cross-referencing DBI permit history on the SF DBI permit tracking system against the GC name and their structural engineer of record. Three, confirm the GC works with a California-licensed Professional Engineer (structural discipline) on the design panel — a SE stamp is required on every soft-story drawing set that goes to DBI, and GCs without an established SE partner will cause schedule slippage during plan-check. If the building is tenant-occupied, ask for a Section 37.9 Rent Ordinance compliance plan as part of the bid package. A GC that has never worked occupied will not price that correctly. Baily's match filter runs all four checks automatically and matches one partner GC rather than the three-to-five-bid race that leads to the cheapest contractor winning and the owner paying twice when the work fails inspection.

Disclaimer

Baily is an AI scoping tool, not a licensed contractor or structural engineer. All estimates, regulatory summaries, and permit guidance on this page are preliminary and informational. Final scoping, engineering, DBI permits, tenant-relocation plans, and all construction work are performed by Baily's vetted Certified Partner GC in San Francisco, who holds all required CSLB licenses, insurance, and has a licensed California structural engineer on the design panel.

Sources

• CAPSS — Community Action Plan for Seismic Safety, City and County of San Francisco
• ESIP Soft-Story Retrofit Program, Earthquake Safety Implementation Program
• San Francisco Building Code Chapter 34B — Mandatory Earthquake Retrofit of Wood-Frame Buildings
• DBI Administrative Bulletin AB-107 — Prescriptive Standards for Soft-Story Retrofit
• SF DBI Permit Tracking System
• San Francisco Rent Board — Ordinance and Regulations
• SF Rent Board Rules and Regulations (Regulation 7.16, capital improvement pass-through exclusions)
• California Contractors State License Board — CSLB Contractor Lookup
• ASCE 41 — Seismic Evaluation and Retrofit of Existing Buildings, American Society of Civil Engineers

Last updated: 2026-04-19