Do I need a permit to replace my water heater in San Francisco?

Yes. Any new water heater installation in San Francisco requires a Building Department permit, even if it's a direct replacement. The permit allows the inspector to verify that the installation meets current code (which includes earthquake strapping and proper venting). This is a simple permit — usually issued over-the-counter — but you need one. The permit costs about $75–$150. A licensed plumber must pull the permit or do the work (you can pull the permit yourself if you're owner-building, but the licensed plumber doing the work is responsible for compliance). Plan-review time is minimal — 1–2 days for water-heater permits.

What's the difference between a Building Department permit and a Planning Department review in San Francisco?

The Building Department ensures the project meets the California Building Code and is constructed safely. The Planning Department ensures the project complies with zoning, height limits, setbacks, and neighborhood character rules. Many residential projects need both. For example, a room addition needs a Building Department permit (structural, electrical, plumbing) and a Planning Department zoning review (will it violate height limits? setback rules? is the lot a historic property?). Planning review is a separate application and fee, typically $100–$500. Plan on submitting to Planning first; once you get zoning approval, you can file the Building permit. The total timeline is 6–10 weeks for both reviews combined.

How much does a residential permit cost in San Francisco?

Building Department permit fees are based on the project valuation — typically 1.5–2% of the estimated construction cost. A $50,000 kitchen remodel might cost $800–$1,000 in Building Department fees. A $100,000 addition might cost $1,500–$2,000. Plan review deposits are required upfront (usually $300–$800 for residential work); if plan review costs exceed the deposit, you pay the difference upon issuance. Add 20–30% to the Building fee for expedited review if you want a faster turnaround. Planning Department zoning reviews are typically $100–$300 flat fee. Historic Preservation Commission review (if applicable) is $200–$400. Structural engineering for additions or seismic work is a separate cost, usually $2,000–$5,000. Geotechnical reports for foundation work run $1,500–$3,000.

Can I do the construction work myself in San Francisco (owner-builder)?

Yes, under California Business and Professions Code Section 7044, you can be an owner-builder on a single-family home and pull your own permits. However, California law prohibits owner-builders from performing electrical, plumbing, or gas work — those must be done by licensed trades. You can also hire general contractors or specialty contractors (framers, roofers, etc.) to do work while you remain the permit holder. If you pull a permit as an owner-builder, you are legally responsible for code compliance and permit terms; the Building Department will cite you if work doesn't meet code. Many homeowners hire a general contractor or use a licensed contractor to pull the permit on their behalf — this shifts some liability but requires a written agreement about who's responsible for inspections and corrections.

How long does plan review typically take in San Francisco?

Standard residential projects (kitchens, bathrooms, small additions) typically take 4–6 weeks for Building Department plan review. Larger projects (second stories, major additions) take 6–10 weeks. Projects that require Planning Department zoning review or Historic Preservation Commission review add another 2–4 weeks. Electrical and plumbing permits are faster — usually 2–3 weeks. Expedited review is available (for an extra 20–30% fee) and typically cuts 1–2 weeks off the timeline. Seismic assessments and geotechnical reviews can add 2–3 weeks if they're required. Once plan review is complete and the permit is issued, inspection scheduling and corrections typically take another 4–8 weeks depending on project complexity.

What happens if I start work without a permit in San Francisco?

San Francisco Building Inspection actively inspects properties and citations are common. If the department discovers unpermitted work, you'll be issued a citation (fine, typically $200–$500) and ordered to stop work. You'll then need to file for a retroactive permit, which includes a penalty (usually 50–100% of the normal permit fee) and requires the work to be inspected for code compliance — meaning some work may need to be torn out and redone. Any unpermitted electrical or plumbing work discovered during a future renovation or sale inspection creates additional liability; banks and title companies often require permits to be in place before financing or closing. The safe move is to file a permit before you start — it's cheap insurance against fines and future complications.

Do I need a permit to paint my house exterior in San Francisco?

Not for paint itself. Exterior painting alone doesn't require a permit. However, if your property is in a Historic District, certain colors or finishes may require Historic Preservation Commission approval — check with the department first if you're in a historic area. If painting involves removing and replacing siding, power-washing that affects the foundation, or scaffolding work that requires safety measures, those aspects may trigger permit requirements. Routine painting: no permit. Painting with siding replacement or structural access work: check with the department.

Can I convert my garage into a room in San Francisco?

Yes, but it requires a permit. Garage conversions involve removing the garage door, infilling the opening, adding windows and ventilation, and possibly rerouting utilities. All of this requires a Building Department permit plus Planning Department zoning review (to ensure the lot still has required parking or an off-street parking exception). Most San Francisco lots don't require on-site parking as long as the home is within walking distance of transit, but the Planning Department makes that call. The permit typically takes 5–7 weeks. Expect costs of $800–$1,500 for the permit, plus $3,000–$8,000 for the construction work (door infill, framing, drywall, windows).

What's the frost-depth requirement for decks and fences in San Francisco?

Most of San Francisco is in the coastal zone with no frost-heave risk — frost depth is not a concern for deck or fence footings in the city proper. However, if you're building at elevation in Twin Peaks, Mount Sutro, or other hilltop areas, you're in USDA zone 5B–6B with potential frost depths of 12–30 inches. For any footing work in those areas, use 30 inches as a conservative minimum. Bay Mud and soft soils (Marina, Mission Bay, parts of Sunset) may require special footing designs regardless of frost depth — check with the Building Department if you're in those neighborhoods.

Do I need a permit to build a shed or small outbuilding in San Francisco?

Yes. Any accessory building (shed, pergola, playhouse) larger than 120 square feet in San Francisco requires a Building Department permit. Sheds under 120 square feet may be exempt from permits in some jurisdictions, but San Francisco is stricter — check with the department. Most sheds need electrical and potentially plumbing permits as well if they include power or water service. Setback and property-line requirements apply to sheds just as they do to main structures. A simple 8x10 shed permit typically costs $150–$300 and takes 2–3 weeks for plan review.

Building Permits in San Francisco, CA (2026)

Do I need a permit in San Francisco, CA?

San Francisco's permitting system is managed by the San Francisco Building Department, which enforces the 2022 California Building Code (with San Francisco amendments) and handles all residential construction permits for the city. The city's complex zoning, seismic requirements, and aggressive affordability rules make San Francisco permits more involved than most Bay Area jurisdictions — and much more involved than inland California. Most residential projects require a permit: decks, fences, electrical upgrades, plumbing work, room additions, accessory dwelling units (ADUs), and kitchen or bathroom remodels. Even small projects like replacing a water heater or installing solar panels need a permit in San Francisco. The reasons are layered: San Francisco sits on Bay Mud and reclaimed land in many neighborhoods, triggering geotechnical review; the city's seismic retrofit requirements apply to most older structures; and the Planning Department has discretionary authority over projects that affect neighborhood character or historic districts. Owner-builders can pull permits for most work under California Business and Professions Code Section 7044, but electrical, plumbing, and gas work must be performed by licensed trades — you can hire them and pull the permit yourself, but the licensed contractor is legally responsible for code compliance. Plan review times in San Francisco are longer than average because the department coordinates with the Planning Department, Department of Building Inspection, Fire Department, and sometimes the Historic Preservation Commission. Expect 4–8 weeks for standard residential projects, longer for anything touching zoning, density, or historic designation.

What's specific to San Francisco permits

San Francisco uses the 2022 California Building Code with local amendments — the most restrictive version in the state. This means seismic requirements, energy-efficiency standards, and water-conservation rules are tougher than surrounding counties. Any structural work, roof replacement, or addition triggers seismic review. Most pre-1978 buildings are flagged for soft-story or cripple-wall assessment; if your home is on pilings or has an open first floor (common in neighborhoods like Marina and Sunset), structural calculations are mandatory. The city also requires all new electrical panels to be arc-fault protected, and all plumbing to meet current water-conservation standards — which means a simple water-heater swap often requires panel upgrades or pipe rework that wouldn't be mandated elsewhere.

Zoning in San Francisco is granular and heavily mapped. The city uses a two-letter zoning system (RH, RD, RC, etc.) that determines height limits, setbacks, and density. Adding a room, converting a garage, or building an ADU requires Planning Department review, even if it's code-compliant structurally. Many neighborhoods have Historic District overlays; if your property is in one, exterior changes and some interior work need Historic Preservation Commission approval before Building Department permits are issued. This adds 2–4 weeks to plan review. The Planning Department also charges separate fees (usually $100–$500) for zoning compliance review, on top of Building Department permit fees.

Bay Mud and soft soils are a real issue in neighborhoods near the Bay (Marina, Mission Bay, parts of the Sunset and Richmond). Any foundation work, piling repair, or basement excavation requires a geotechnical report. San Francisco's Department of Building Inspection will not issue a permit for foundation work without a professional engineer's soils report. This costs $1,500–$3,000 and adds 3–4 weeks to the timeline. If you're in the Sunset, Richmond, or Western Addition, check the USGS Bay Area geological map or call the Building Department to confirm whether your lot is on Bay Mud — it's a yes-or-no answer that determines whether you need a geotechnical study.

The city's online permit portal exists and allows you to check status and request inspections, but initial applications must be submitted in person or by mail at the San Francisco Building Department office. The department has moved toward online filing for some simple permits (small additions, solar, minor electrical), but most residential projects still require a paper application package with wet signatures, title reports, and architect/engineer stamps. The in-person submission requirement is frustrating but unavoidable — plan to visit the department at least once during permitting.

San Francisco has aggressive ADU rules. AB 68 (California state law) allows two ADUs per residential lot; San Francisco adopted this but adds its own requirements. ADU permits are typically faster than full additions (3–5 weeks vs. 6–8 weeks) because the city has streamlined the process, but you still need electrical, plumbing, and sometimes fire-separation review. ADU fees run $800–$2,000 total depending on size and whether the unit requires new utilities. The city also has rent-control implications for ADUs — make sure you understand the tenant-protection rules before filing.

Most common San Francisco permit projects

These are the projects that trigger San Francisco permits most often. Each one has local nuances worth understanding before you call a contractor.

Decks

Any deck or elevated patio over 30 inches high requires a Building Department permit in San Francisco. Ground-level patios (under 30 inches) are usually exempt unless they involve foundation digging or soil disturbance. Decks connected to the house need ledger-board inspection, which is a common failure point — the inspector will verify the ledger is bolted to the rim joist, not the siding or brick.

Fences

San Francisco requires a permit for any fence over 6 feet tall or any masonry wall over 4 feet. Corner-lot setbacks are strict — fences in sight triangles must be lower or set back further. Many fences in San Francisco are shared; if you're replacing an existing fence on a property line, the neighbor has legal standing to object during the permit review.

Roof replacement

Roof replacement permits in San Francisco are routine if you're using like-for-like materials. If you're changing materials (e.g., asphalt to metal or tile), plan review is required. Seismic tie-down requirements apply to most older homes — the inspector will check for proper framing connections and may require bracing work before the new roof is installed.

Electrical work

All electrical work in San Francisco requires a permit, even simple fixtures like ceiling fans or outlet replacement. Panel upgrades, subpanel installations, and EV-charger wiring always need permits. Licensed electricians must pull the permits — you cannot do electrical work yourself in California. Plan on 2–3 weeks for electrical plan review and inspection.

Kitchen remodel

Any kitchen or bathroom renovation that involves plumbing, electrical, or structural changes needs a full Building Department permit in San Francisco. This includes cabinet replacement if you're moving fixtures, countertop installation with plumbing rework, or lighting upgrades. Cosmetic work only (paint, flooring, cabinet refacing with no fixture moves) may be exempt, but it's safer to assume the work needs a permit.

Room additions

Adding a room or second story in San Francisco requires structural engineer drawings, zoning review (Planning Department), and seismic assessment. Most additions trigger height-limit and setback review. Plan on 6–10 weeks for plan review. Seismic retrofit requirements may be imposed as a condition of approval — add another $10,000–$30,000 to the budget if the city requires soft-story reinforcement or cripple-wall bracing.

Solar panels

Solar permits in San Francisco are streamlined under state law (AB 2188). The permitting process is faster than most projects — typically 2–3 weeks. However, rooftop solar in historic districts may require Historic Preservation Commission review, which adds 2–4 weeks. Battery storage systems need a separate electrical permit and fire-department review.

Accessory dwelling units (ADUs)

San Francisco allows ADUs under state law (AB 68) and has streamlined the permitting process. You can build one ADU (junior or full) on most residential lots. ADU permits move faster than traditional additions — typically 3–5 weeks. Electrical, plumbing, and fire-separation are still required. ADU fees are typically $800–$2,000 total.

Do I need a building permit in San Francisco, CA?