Do I need a building permit
in Half Moon Bay, CA?

Do I need a permit in Half Moon Bay, CA?

What's specific to Half Moon Bay permits

Half Moon Bay is a coastal city, and that shapes almost every permit decision. If your property is within the Coastal Zone (generally the area west of Highway 1, but verify with the city), you'll need a Coastal Development Permit in addition to your building permit. This isn't just paperwork — it adds 2-4 weeks to review because the city staff has to write up findings showing the project is consistent with the California Coastal Act. Even small residential projects like a deck, shed, or exterior remodel can trigger CDP review. The California Coastal Commission itself only reviews certain projects; most Half Moon Bay permits are reviewed by the city under delegated authority. Ask the Building Department up front: Is my property in the Coastal Zone? If yes, plan for dual permitting.

Hazard-zone overlays affect a lot of Half Moon Bay properties. The city sits in or near multiple hazard areas: liquefaction hazard zones (Bay Mud and bay-side soils can liquefy in earthquakes), fault-line setback zones (several regional faults run through San Mateo County), wildfire hazard areas (especially inland foothills), and tsunami inundation zones (coastal areas). These aren't automatic deal-killers, but they do mean geotechnical reports, soil testing, or enhanced structural requirements get bundled into plan review. A foundation repair or new construction project in a liquefaction zone will likely require a Phase I geotechnical report; the city will ask to see it before they'll approve footing placement. Costs for these investigations run $1,500–$3,500, but they're required by code, not optional.

California Building Code (Title 24) is your baseline, and the city adopts it with local amendments. California's code is stricter than the national IBC in several ways: solar-readiness requirements for new residential (CA Title 24 § 110.2), stricter energy efficiency than national baselines, and mandatory CALGreen measures (water conservation, waste management during construction). If you're doing a major remodel or addition, expect the plan reviewer to flag energy-code compliance — insulation values, window U-factors, duct leakage, HVAC efficiency. It's not optional, and a plan check can bounce if energy documentation is missing.

Owner-builder work is allowed in California, but with important limits. You can pull a permit and do the work yourself for residential projects (up to four units) on property you own or are building for yourself. However, electrical work must be done by a licensed electrician — you cannot do this yourself, even in a single-family home, without a commercial electrical license. Same for plumbing (licensed plumber required) and gas work (licensed gas fitter). Framing, roofing, siding, decks, interior finishes — those you can do. But the moment you're connecting a wire, running a new water line, or tapping the gas line, you need a licensed trade pulling the subpermit. This is state law, not local, and Half Moon Bay enforces it strictly.

Permit timelines and fees. Half Moon Bay processes over-the-counter permits (simple stuff like fence repairs, non-structural interior work, small accessory structures) in 1–2 weeks. Projects requiring plan review — additions, new construction, significant remodels, anything in the Coastal Zone — take 3–6 weeks for initial review, then revisions, then re-review. Coastal Development Permits add another 2–4 weeks. Building permit fees are based on valuation: typically 0.5%–1% of the estimated construction cost for residential work, with a minimum fee of $65–$150 (vary by jurisdiction). If you're adding Coastal Development Permit review, add a flat fee ($300–$500 range) plus plan review hours. Total cost for a simple deck might be $200–$400; a full-house remodel in the Coastal Zone can run $800–$2,000+ in permit fees alone, plus any required consulting reports.

Most common Half Moon Bay permit projects

Half Moon Bay homeowners and contractors most often ask about decks, fences, sheds, additions, and coastal remodels. These are the projects where local conditions and overlays hit hardest. A deck facing the Pacific needs different footings than one in an inland suburb, and Coastal Development Permit review changes the timeline. Check the project that matches yours below, or call the Building Department to confirm if your specific work needs a permit.

California context for Half Moon Bay permits

California Building Code (Title 24) is the state standard, and all cities adopt it with local amendments. Half Moon Bay uses Title 24 as written, plus local overlays for coastal protection and hazard zones. One state-level rule that affects homeowners directly: California Business & Professions Code Section 7044 allows owner-builders to pull permits and do their own work, but electrical, plumbing, and gas work must be done by licensed trades. This is strict — no exceptions for single-family homes. Also note that California requires a Notice of Cessation or Notice of Completion to release mechanic's lien rights after construction. Most contractors file this; homeowners should ask about it when closing out their permit. Seismic design is another state overlay: the California Building Standards Commission updates seismic requirements regularly, and Half Moon Bay's proximity to the San Andreas and other faults means new construction and significant remodels get seismic scrutiny in plan review. Finally, California's Title 24 solar-readiness rule (Section 110.2) requires that all new residential construction be designed to accommodate a future solar electric system, even if you're not installing solar now. Plan reviewers will check this.

Common questions