San Mateo Building Permit — Filed & Tracked For You

San Mateo is a Peninsula city of about one hundred three thousand residents midway between San Francisco and San Jose, with a dense downtown, an established residential grid and a large office and biotechnology base. Its Building Division, within Community Development at City Hall on West Twentieth Avenue, is the sole building authority inside the city.

This guide covers the Building Division, its online permit centre, Title 24 with city amendments, and the tree, expiry and review-route rules that shape San Mateo projects.

This guide covers work inside the City of San Mateo limits. Unincorporated San Mateo County and neighbouring cities are separate authorities.

What requires a building permit in San Mateo?

California builds on a single statewide code — the California Building Standards Code, known as Title 24 — adopted on a three-year cycle by the California Building Standards Commission. The 2025 edition took effect on January 1, 2026 and governs statewide. Cities and counties enforce Title 24 and may adopt local amendments, but an amendment must be filed with the state and may only be equal to or more restrictive than the state code, justified by local climatic, geologic or topographic conditions. So the first question in San Mateo is which authority has jurisdiction — the city on incorporated parcels, the county in unincorporated territory — and what local amendments sit on top of Title 24.

Local amendments and thresholds differ from one jurisdiction to the next, so an exempt list from a neighbouring city is not reliable — a project waved through in one place needs a full permit set in the next. An exemption from a building permit is never an exemption from zoning, the statewide energy or green-building codes, or an electrical or plumbing permit. Confirm scope with Building Division before work starts.

The statewide layers that apply everywhere

Several parts of Title 24 apply on top of the base building code and routinely catch projects owners assume are exempt: the California Energy Code (Part 6), among the strictest in the nation; CALGreen (Part 11), California’s mandatory statewide green-building code; and the accessibility provisions in Chapters 11A and 11B. Seismic design is built into the code statewide, and in fire-prone areas the wildland-urban-interface rules of Chapter 7A and Cal Fire defensible-space requirements add a further layer. In the City of San Mateo, the Building Division administers Title 24 with city amendments, and the municipal code sets the expiry periods that govern plan check approval and issued permits.

Who handles permitting in San Mateo?

The Building Division handles plan check, permit issuance and inspections for the City of San Mateo, with the Planning Division reviewing height, size and occupancy type alongside.

The Building Division runs plan check, permit issuance and inspection for the City of San Mateo from City Hall, with a counter that runs a split daily schedule. Building permit applications, planning applications and private tree removal applications all move through the city’s customer self-service portal, and plan checkers hold virtual over-the-counter slots each weekday morning for qualifying minor projects.

Confirm the parcel is inside the city first; unincorporated San Mateo County and the neighbouring Peninsula cities file with different authorities under their own amendments.

Permit types

Residential permits

Residential work inside the city is permitted and inspected by the division under Title 24 and city amendments. Building permits are required to build, enlarge, alter, remove, demolish or repair a structure, and separate electrical, mechanical and plumbing permits apply to those trades. Express permits are issued at the counter or online where no plan review or construction drawings are needed.

How California contractor credentials work

California licenses contractors statewide through the Contractors State License Board, not locally. The CSLB issues three license types — Class A for general engineering, Class B for general building, and the Class C specialty classifications for individual trades — and a contractor must hold the classification that matches the work. A license is required for any project valued at one thousand dollars or more in combined labour and materials, and, in practice, for any work that requires a permit regardless of value.

Commercial permits

Commercial and multi-family work goes through division plan check against the California Building Code, the Energy Code and CALGreen, with city amendments. Submittals follow the city’s electronic review requirements, plans are generated as PDFs at the published minimum size, and food facility work carries additional review.

Licenses, trade classifications and design professionals

Practically, three credential layers appear on California projects: a CSLB license in the correct classification for the contractor pulling the permit; the specialty C-classifications for the electrical, plumbing and mechanical trades; and, on commercial and larger residential work, drawings stamped by a California-licensed architect or engineer. Confirm what Building Division requires for the specific building before filing.

San Mateo permit costs and fees

Budget the city building permit and plan-check fees, separate trade permits, the state Building Standards and seismic surcharges, and any development impact fees. Plan check approval and issued permits both expire on periods set in the municipal code; confirm the position for your filing date.

California layers two uniform state surcharges — the Building Standards Administration fee and the Strong Motion Instrumentation seismic fee — on top of the local charges, so they appear on permits everywhere. The building and plan-check fees themselves are local and change, and California law limits them to the reasonable cost of providing the service, so a figure from a neighbouring city is not reliable — ask Building Division for the schedule in force on your filing date.

Trade permits and who may pull them

Trade permits are separate from the building permit and, on projects that require one, generally cannot be issued until the building permit is in place. Each trade follows its own part of Title 24 — the California Electrical, Plumbing and Mechanical Codes — and is tied to a contractor holding the matching CSLB specialty classification, the same license statewide.

• Electrical work follows the California Electrical Code and a C-10 electrical contractor.
• Plumbing work follows the California Plumbing Code and a C-36 plumbing contractor.
• Mechanical work follows the California Mechanical and Energy codes and a C-20 HVAC contractor.

How to apply for a San Mateo building permit

Review, corrections and what actually causes delay

In California, the first cause of delay is uncertainty over jurisdiction — filing with the county when a city should have it, or missing a local amendment on top of Title 24. After that come Title 24 energy and CALGreen documentation, a CSLB classification that does not match the scope, and, in fire or coastal areas, defensible-space or coastal-zone requirements that were not addressed up front. Build the plan-check time into the schedule and confirm the checklist with Building Division before filing.

Inspections in San Mateo

Where a permit is required, standard checkpoints include footing and foundation, framing, rough-in electrical, plumbing and mechanical, insulation and Title 24 energy, CALGreen measures, fire systems on commercial work, and final, with a certificate of occupancy before use. Inspections are scheduled through the customer self-service portal against the issued permit record.

California inspections are keyed to the code editions in force when the permit issued, so the approved plans and any energy and green-building documentation need to be on site for the inspector to check against. Confirm the notice Building Division needs and schedule around its inspection windows.

Do not cover work before the required inspection has been approved. Keep the issued permit, the approved plans, product listings, Title 24 energy documentation and your correction responses available on site.

San Mateo permit search and official resources

Permit records in California sit with the local authority that issued them. Where the City of San Mateo Building Division is the authority for the City of San Mateo limits, it holds the building permit, the inspection history and the certificate of occupancy. If you are buying, refinancing or renovating, confirm that past work was permitted rather than assuming it was — and confirm the code edition that was in force.

These are the primary sources behind this guide. Codes, fee schedules and procedures change — confirm the position for your filing date.

• City of San Mateo Building Division
• California Building Standards Commission (Title 24)
• Contractors State License Board (CSLB)
• California Energy Commission (Energy Code)
• California Department of Housing and Community Development

Frequently asked questions

Who issues building permits in the City of San Mateo?

The city Building Division at City Hall. The City of San Mateo and the County of San Mateo are separate authorities, and unincorporated parcels file with the county in Redwood City.

Is there a faster review route?

Yes. Plan checkers hold virtual over-the-counter slots each weekday morning for qualifying minor projects, with a response inside one business day of a complete submittal.

Do I need a tree permit?

Removing a protected tree from any property in the city requires a permit from the city arborist, and the city asks applicants to consider alternatives first.

Do I need a local contractor registration?

No. California licenses contractors statewide through the CSLB; the license must be active and carry the classification that matches the work.

Do permits expire?

Yes. The municipal code sets expiry periods for both plan check approval and issued permits, and the building official may grant written extensions on justifiable cause.

How do I run a San Mateo permit search?

The division holds the city’s permit and inspection records through the self-service portal; confirm past work was permitted before buying or renovating.

Simplify San Mateo permitting with Alliance Permitting

San Mateo rewards a filing routed to the right authority and kept inside its expiry windows. City and county are easy to confuse, and permits here do lapse.

Trusted by leading builders, developers, and national contractors — 22 years of filing in the jurisdictions we write about.

Contractors and builders choose Alliance for San Mateo because the work is done by people who have stood at the counter:

• We confirm the parcel is inside the city rather than the county.
• We file through the self-service portal with the right application type.
• We check protected tree status before the site plan is fixed.
• We use virtual over-the-counter review for qualifying scopes.
• We track the plan check and permit expiry clocks through final.

Alliance Permitting is a permit documentation and submission company. We prepare your paperwork, file it correctly and coordinate with the permitting authority through issuance. We are not a contractor and we do not perform licensed plan review or inspections; that work stays with your licensed team and the jurisdiction.