If you want to remodel, retrofit, or build homes in the city, the first question is which license you actually need. There is no separate residential contractor license San Francisco issues on its own. Every contractor working on a house, flat, or multi-unit building in the city is licensed by the California Contractors State License Board (CSLB), and that license is valid statewide. What makes San Francisco different is everything after the license: Department of Building Inspection permits, Planning Department review, historic preservation rules, soft-story retrofits, and one of the oldest housing stocks in California.
This guide matches the residential projects San Francisco contractors actually take to the right CSLB classification, then covers requirements, exams, fees, bonds, home improvement contract rules, and the local steps needed to operate legally in the city.
Start With the Project, Then Pick the License
Many applicants pick a classification first and then discover it does not cover the work their clients want. In San Francisco, where one Victorian renovation can involve foundations, framing, electrical, plumbing, and finish carpentry, that mismatch is expensive. Let your projects decide the license.
Full Remodels and Additions on Existing Homes
A bathroom relocation, an attic conversion, a rear addition on an Edwardian flat. These jobs involve two or more unrelated trades and usually touch structure. This is Class B (General Building) territory. The B license lets you contract for the whole job, self-perform framing and carpentry, and subcontract the trades. Our B License guide covers the classification in depth.
Remodels That Stay Inside the Existing Envelope
If your work is limited to improving existing homes, consider the B-2 Residential Remodeling classification. The B-2 covers projects on existing residential structures involving at least three unrelated trades, such as cabinets, flooring, drywall, finish plumbing, and lighting in one contract. It does not allow structural changes, additions, or new construction. For a contractor who wants a steady interior-remodel business without load-bearing work, the B-2 is a realistic and often faster path, because remodeling experience alone can qualify you.
Ground-Up Homes, ADUs, and New Units
A new single-family home, a detached accessory dwelling unit, or a new legal unit inside an existing building is new construction with framing. That requires Class B. A B-2 holder cannot take these jobs, so if you want to grow into new builds, plan for the B from the start.
Seismic and Soft-Story Retrofits
Retrofit work on wood-frame buildings, including the city’s mandatory soft-story program, involves foundation bolting, shear walls, steel moment frames, and often concrete. A Class B contractor can take the whole retrofit and subcontract the specialty pieces. A C-8 Concrete or other specialty license may handle a defined portion, but the prime contractor is almost always a B.
Single-Trade Jobs
If you only intend to do one trade, a Class C specialty license is enough. A C-10 Electrical contractor can rewire a 1905 flat. A C-36 Plumbing contractor can replace galvanized supply lines. A C-39 Roofing contractor can handle a flat roof on a Sunset District row house. You do not need a B license for single-trade work, and a B license does not let you self-perform trades you lack experience in. See our C-10 electrical license guide for an example of a specialty path.
| Typical San Francisco Residential Project | CSLB Classification That Fits | Why |
|---|---|---|
| Whole-house remodel with structural changes | Class B | Multiple trades plus framing and structure |
| Kitchen and bath remodel, no structural work | B-2 or Class B | Three or more unrelated trades on an existing home |
| Rear addition or vertical addition | Class B | New framing and foundation work |
| ADU or new unit construction | Class B | New construction |
| Soft-story seismic retrofit | Class B (with specialty subs) | Structural scope across trades |
| Rewiring only | C-10 | Single trade |
| Repiping only | C-36 | Single trade |
| Roof replacement only | C-39 | Single trade |
When a License Is Required
As of 2026, a CSLB license is required for any project where labor and materials total $1,000 or more (raised from $500 by AB 2622, effective January 1, 2025). In San Francisco, almost any residential job clears that figure, so the practical answer is that all residential work requires a license. Confirm current figures at cslb.ca.gov.
Unlicensed contracting is a misdemeanor, with up to six months in jail and a $5,000 fine for a first offense. DBI checks license status at permit filing, and homeowners can verify any contractor at cslb.ca.gov.
Requirements for a Residential Contractor License in San Francisco
Because the license is statewide, the requirements are the same whether you work in San Francisco or Los Angeles. The California CSLB guide covers the full process; here is what matters most for residential applicants.
Experience
You need four years of journey-level or higher experience (foreman, supervisor, or contractor) within the last ten years in the classification you are applying for. Up to three years can be credited for education, apprenticeship, or technical training, but at least one year must be hands-on. A qualified certifier, such as an employer, fellow journeyman, licensed contractor, union representative, or building inspector, must verify it.
For Class B, the experience must include framing or rough carpentry plus two other unrelated trades. For B-2, residential remodeling experience across three or more unrelated trades is enough, which is why many remodelers qualify for the B-2 first.
Exams
Once the CSLB accepts your application, you sit two multiple-choice exams at a PSI testing center: the Law and Business exam and the trade exam for your classification. Waivers exist in limited cases, such as already holding a license in the same classification or serving as qualifying individual for a licensed firm for five of the last seven years.
Fingerprinting and Background Check
Live Scan fingerprinting with a DOJ and FBI background check is mandatory.
Business Structure and the Qualifying Individual
You can license as a sole proprietor, partnership, corporation, LLC, or joint venture. Corporations and LLCs must name a qualifying individual: a Responsible Managing Officer (RMO) or Responsible Managing Employee (RME) who holds the experience and passes the exams for the company. An RMO who owns at least 10 percent of the business avoids the additional qualifier bond.
Fees, Bonds, and Insurance
Figures are as of 2026; confirm current amounts at cslb.ca.gov.
| Item | Amount | Notes |
|---|---|---|
| Original application fee | $450 per classification | Nonrefundable |
| Initial license fee | $200 sole owner / $350 non-sole owner | Paid after passing exams |
| Live Scan fingerprinting | About $49 to $75 | Varies by provider |
| Exam rescheduling | $100 | Per reschedule |
| Renewal (every 2 years) | $450 active sole owner / $700 active non-sole owner | Late fees apply |
| Adding a classification | $230 | Plus trade exam if required |
| Contractor License Bond | $25,000 | Premium roughly $100 to $600 per year |
| LLC Employee/Worker Bond | $100,000 | LLC licensees only |
| Bond of Qualifying Individual | $25,000 | If qualifier owns under 10 percent |
The $25,000 Contractor License Bond must stay in force continuously. Our contractor license bond guide explains how premiums are set.
The Workers’ Compensation Rule for B-2
This catches many remodelers off guard. Workers’ compensation is normally required only if you have employees, but anyone holding a B-2 must carry it regardless of employees. The same rule applies to C-8 Concrete, C-20 HVAC, C-39 Roofing, and C-61/D-49 Tree Service. If you are weighing B-2 against Class B as a one-person operation, budget for this policy. Under SB 216, every CSLB licensee will need workers’ compensation or a certificate of self-insurance starting January 1, 2028.
Home Improvement Contract Rules
Residential work carries the CSLB’s strictest consumer protection rules, and San Francisco homeowners tend to know them. Any home improvement contract over $500 must meet CSLB requirements:
- The contract must be in writing, with a clear scope, total price, and progress payment schedule.
- The down payment is capped at $1,000 or 10 percent of the contract price, whichever is less.
- The homeowner has a three-day right to cancel after signing, extended to five days for seniors. The contract must include the cancellation notice in the required form.
- Progress payments cannot exceed the value of work performed or materials delivered.
Violations are grounds for discipline against your license. Build compliant contract templates before you take your first job.
San Francisco Permits, Planning, and Local Rules
Your CSLB license gets you in the door. The city determines what you can build and how long approval takes. This is where holding a residential contractor license in San Francisco differs from the rest of California.
Department of Building Inspection (DBI)
Residential building permits are issued by the San Francisco Department of Building Inspection at 49 South Van Ness Avenue. Most work touching structure, electrical, plumbing, or exterior walls requires a permit. Over-the-counter permits cover limited scopes, but layout changes, additions, and new units go through full plan review. DBI verifies your license and workers’ compensation status at filing.
Planning Department Review
Exterior changes, additions, new units, and changes of use are reviewed by the San Francisco Planning Department before DBI issues the permit. Planning checks zoning, rear yard and height limits, and residential design guidelines. Some projects trigger neighborhood notification, which gives neighbors a window to request a discretionary review hearing. Build this into your schedules and client expectations.
Historic Preservation
Many Victorian and Edwardian buildings are designated or presumed historic resources because of their age. Exterior work on them, including window replacement, siding, and facade changes, can trigger preservation review. Contractors who know how to restore rather than replace period details have a real advantage in this market.
Soft-Story Retrofits and Seismic Requirements
The city’s Mandatory Soft Story Retrofit Program requires wood-frame buildings with five or more units and a soft ground floor, typically garages or storefronts, to be seismically strengthened. Retrofit work remains a steady source of residential contracting. Beyond that program, steep lots and hillside sites bring additional geotechnical and structural requirements for foundations, retaining walls, and drainage.
Business Registration
Anyone doing business in the city must obtain a San Francisco Business Registration Certificate from the Office of the Treasurer and Tax Collector. It is separate from your CSLB license, renews annually, and is required before DBI will issue you permits.
Working in San Francisco’s Housing Stock
The city’s residential inventory is dominated by wood-frame Victorians and Edwardians built between the 1880s and 1920s. They present conditions you will rarely find in newer California suburbs:
- Brick or unreinforced foundations that need replacement before a significant remodel
- Knob-and-tube wiring and galvanized plumbing that must be upgraded when walls are opened
- Zero-lot-line construction with shared walls and dense lots that limit staging and deliveries
- Period millwork, plaster, and facade details that owners and Planning expect to be preserved
The labor market is expensive and strongly unionized. Contractors who hold the right classification and respect the city’s review process earn repeat business quickly.
Application Timeline
- Confirm the classification that matches your project mix: Class B, B-2, or a specialty C license.
- Assemble four years of verified experience and, for a corporation or LLC, identify your RMO or RME.
- Submit the application and $450 fee per classification. CSLB review typically takes four to eight weeks.
- Complete Live Scan fingerprinting.
- Pass the Law and Business exam and the trade exam at a PSI center.
- Submit your $25,000 bond, workers’ compensation certificate if required, and the initial license fee.
- Obtain your San Francisco Business Registration Certificate and set up your DBI account.
From application to license number, the process typically takes three to six months.
Frequently Asked Questions
Does San Francisco issue its own residential contractor license?
No. All contractor licenses in California are issued by the CSLB and are valid statewide. San Francisco requires a Business Registration Certificate and issues permits through DBI, but it does not license contractors.
Can I remodel a kitchen in San Francisco with a B-2 license?
Yes, as long as the project involves at least three unrelated trades and does not include structural changes, additions, or new construction. If you plan to remove a bearing wall or expand the footprint, you need a Class B license.
Do I need a Class B license to do soft-story retrofits?
In most cases the prime contractor holds a Class B license because the work spans foundation, framing, and structural steel. Specialty contractors can perform defined portions under subcontract.
Do I need workers’ compensation if I work alone with a B-2?
Yes. Workers’ compensation is mandatory for every B-2 licensee regardless of employees. Beginning January 1, 2028, it will be required for all CSLB licensees.
What happens if a homeowner cancels after signing?
A homeowner can cancel within three business days of signing, or five days for seniors, with no penalty. You must include the cancellation notice in the contract and return any deposit.
Conclusion
Getting a residential contractor license in San Francisco means choosing the right CSLB classification for the projects you intend to build, then layering on the city’s permit, planning, preservation, and registration requirements. Full remodels, additions, ADUs, and retrofits call for Class B. Interior remodels on existing homes can run under a B-2, with the workers’ compensation rule factored in. Single-trade work belongs under a specialty C license. DBI, the Planning Department, and the Business Registration Certificate complete the picture.
If you would like help choosing a classification, documenting experience, preparing for the exams, or setting up an RMO or RME arrangement, RMO Services Agency is a Los Angeles-based licensing consultant that works with contractors across California, including San Francisco. A short consultation can clarify which path fits your plans and keep your application on schedule.