San Mateo building permits

Tips & gotchas

• A SUBMITTED INSPECTION REQUEST IS NOT A BOOKED ONE, AND THE CITY SAYS SO IN TERMS: "Inspection requests are not confirmed until you get a confirmation email by our automated system", arriving around 5:00 PM the night before. Combined with the 3:00 PM next-day deadline and the refusal of same-day requests, the confirmation lands only two hours after the deadline that produced it - so a request made at 2:55 PM is unconfirmed for the rest of the afternoon and there is no same-day recovery if it fails.
• VIRTUAL INSPECTIONS EXIST BUT THE APPLICANT CANNOT CHOOSE ONE: they "are initiated by the building inspector assigned to the project." Santa Rosa decides the medium on the morning and tells you; San Mateo puts the decision with the named inspector and asks you to approach them directly. Neither city lets the applicant book the format, and both tell you which it is at the same moment you learn your window.
• THE CITY TELLS YOU WHOSE PHONE NUMBER TO PUT ON THE FORM, which is unusual and practical: "It is best not to use the call center or dispatch number, but the actual person who will be present at the inspection." The pre-9:00 AM call carries your two-hour window and the in-person-or-virtual decision, so a number that reaches a switchboard loses both.
• A 1997 MODEL CODE IS STILL IN FORCE HERE, AND IT IS DELIBERATE RATHER THAN STALE: "THE DANGEROUS BUILDING CODE (SMMC 23.30): 1997 Uniform Code for the Abatement of Dangerous Buildings." The UCADB is a distinct model code covering abatement of dangerous structures, and many California cities still adopt an old edition of it because the state code does not occupy that ground. This is the opposite case to a page citing superseded building-code section numbers - here the city names the edition, the year and the municipal code section.
• THE REACH CODES ARE ADOPTED BUT NOT YET APPROVED, AND THAT GAP IS THE WHOLE POINT. "On March 16, 2026, the San Mateo City Council adopted an ordinance... The following reach codes are pending the Building Standards Commission (BSC) and California Energy Commission (CEC) approval." A designer reading the requirement table without the sentence above it would design to rules that are not yet enforceable; a designer ignoring the table entirely may be caught when approval lands mid-project. Ask the Building Division which state the ordinance is in on the day you apply.
• AND THE REACH CODES BITE ON ORDINARY RENOVATIONS, NOT JUST NEW BUILDS: a renovation of 1,000 SF or more must "Choose from a menu of energy efficiency, electrification and/or electric readiness measures to meet target score of 12 points", and a kitchen or laundry renovation alone triggers "Electric-readiness measures (reserved breakers space, receptacles, conduit)." Replacing a cooling system requires a heat pump or AC "with energy efficiency measures that exceed State Code." These are the projects homeowners do without expecting a code conversation.
• TWO OF THE SIX PUBLISHED DESIGN CRITERIA ARE POINTERS RATHER THAN NUMBERS - seismic design category "CBC 1613.1" and wind exposure "CBC 1609.4" send you to the code to work the value out, while wind speed, climate zone, soil bearing and roof drainage are given outright. Victorville publishes twelve values with no pointers; San Mateo publishes six, half of them by reference. A design-criteria list is not automatically a list of answers.
• RE-INSPECTION FEES HAVE TWO TRIGGERS AND ONE OF THEM IS ADMINISTRATIVE: not being ready, or not having the plans and permit card on site, and separately "late cancellations of less than 24 hours prior or same day." Cancelling politely but late costs the same as failing.
• AFTER-HOURS INSPECTIONS ARE PAID FOR BEFORE THEY ARE REQUESTED: fees "must be paid prior to requesting the after-hours inspection", and the request itself starts with contacting your project inspector "to review necessity and availability." Two gates before the booking exists.
• INSPECTORS ARE ALL-TRADE, WHICH SIMPLIFIES SCHEDULING: "Building Inspectors are all-trade combinations and can perform all trades inspections." One visit can cover rough frame, electrical rough and plumbing rough rather than three separate attendances.
• THE FEE SPLIT IS THE SAME SHAPE AS ANTIOCH'S, IN ONE SENTENCE: "General building permit fees are based on the valuation of the project. Itemized fee are charged for subcontract permits, such as plumbing, electrical, mechanical, sign and fire department life/safety permits." Asking whether this city charges by valuation gets a yes for the building permit and a no for the trades hanging off it.
• CHICKENS AND BEES ARE ON THE EXPRESS PERMIT LIST, alongside reroofs and water heaters - "Small Animals & Fowl (Chicken and Bee Hive Keeping Annual Permits)". They are annual permits rather than one-off construction approvals, which is a different kind of obligation to the other nine express types.