Do I need a building permit
in Daly City, CA?

Do I need a permit in Daly City, CA?

What's specific to Daly City permits

Daly City sits in a transitional climate zone: coastal areas are 3B-3C (marine influence, minimal frost), while hillside neighborhoods climb into 5B-6B zones with frost depths of 12–30 inches. This matters for decks and foundations. If your lot is in a hillside neighborhood (many are in western Daly City), your deck footings must extend below the local frost depth — typically 18–24 inches minimum — to prevent frost heave. The Building Department will ask for your specific elevation and lot position to determine which zone applies. Coastal lots near the Bay usually skip this requirement entirely, but don't assume. Call before you design.

Daly City is in the San Francisco Bay Area, which means Bay Mud soils in lower elevations and expansive clay in some sections. Bay Mud compresses under load and has poor bearing capacity — you'll see this flagged immediately on foundation work, grading, or deck projects. The Building Department requires a soil engineer's report for any foundation work or substantial fill/cut. Expect to budget $500–$1,500 for a preliminary soil report if the inspector suspects Bay Mud. Hillside lots with granitic soils are typically more forgiving, but again, confirmation saves rework.

The city adopted the 2022 California Building Code with San Mateo County amendments. One quirk: Daly City is aggressive about energy-code compliance (Title 24, Part 6). Any permit involving the thermal envelope — new windows, insulation, HVAC replacement — triggers an energy audit requirement. You can't just install a new furnace; you'll document the existing insulation and duct conditions, and the city may require upgrades as a condition of permit approval. This adds 1–2 weeks to plan review. Budget for it.

Electrical and plumbing work absolutely require permits. California law (Business & Professions Code § 7044) allows owner-builders to pull permits for their own work, but only the owner-builder themselves can file — not a contractor on their behalf. Moreover, electrical and plumbing must be done by a California-licensed electrician or plumber (or the owner themselves if they hold the license, which is rare). The Building Department will ask for proof of licensure before final inspection. A lot of homeowners try to hire a friend to 'help' with the rough-in and then file under owner-builder. That doesn't work. Be honest about who's doing the work.

The City of Daly City Building Department operates Monday–Friday, 8 AM–5 PM (verify hours locally — they can shift seasonally). Most routine permits are processed in 1–2 weeks if complete on arrival. Complex projects (multi-family, commercial, or anything requiring a variance) take 4–8 weeks. The department maintains an online permit portal; check the city's website for the link and login instructions. You can file some permits online (primarily simple residential additions and alterations), but many still require in-person submission with original signatures. Call ahead to confirm your project's filing method.

Most common Daly City permit projects

These are the projects that land on the Building Department's desk most often. Each has its own thresholds, fee structure, and common rejection points. Click through for Daly City-specific guidance on what to file, what it costs, and what inspections to expect.