City of San Mateo Building Department: Permits, Inspections, CSS Portal, Forms and Official Contact
Planning a remodel, addition, ADU, commercial tenant improvement, sign, roof, electrical service upgrade, plumbing work, mechanical system, tree-related project or new construction in San Mateo starts with the City of San Mateo Building Division and the Customer Self-Service Online Permit Center.
This guide explains how to use the official San Mateo permit resources in a practical way, including when a permit is required, how the CSS portal works, what information is needed before inspections, how the daily inspection schedule works, and which related permits may involve planning, trees, public works, fire safety or business licensing.
Office
San Mateo City Hall, 330 West 20th Avenue, San Mateo, CA 94403.
Phone
Call 650-522-7172 for building permit and inspection help.
Email building.info@cityofsanmateo.org for Building Division questions.
Portal
Use the CSS Online Permit Center for applications, payments, resubmittals and inspection scheduling.
Official City of San Mateo Building Permit Links and Resources
Email: building.info@cityofsanmateo.org. City Hall address: 330 West 20th Avenue, San Mateo, CA 94403. Use the CSS Online Permit Center for building permit applications, planning applications, private tree removal applications, payments, comments, resubmittals and inspection scheduling.
What the City of San Mateo Building Division Does
The Building Division helps review construction plans, issue permits, support online permit applications and inspect work for compliance with approved permits and plans.
San Mateo building permits are required to build, enlarge, alter, remove, demolish or repair a structure. This includes work on houses, garages, commercial construction, tenant improvements and signs. Depending on the project, the work may also need electrical, mechanical, plumbing, planning, fire, public works, tree or business-license review.
Building permits
Required for construction, enlargement, alteration, removal, demolition or repair of structures.
Online applications
The CSS Portal lets users submit building permits, planning applications and private tree removal applications online.
Inspections
Inspections confirm projects are constructed in compliance with codes, the approved permit and approved plans.
Common San Mateo Projects That Need a Permit
San Mateo’s official Building Permits page gives broad permit categories. The table below turns those rules into practical examples users usually search for.
Project type | City guidance | Practical tip |
|---|---|---|
Structural work | Permits are required to build, enlarge, alter, remove, demolish or repair a structure. | Submit construction drawings, application form and required fees. |
New homes, additions and ADUs | Residential projects can be submitted through the CSS Online Permit Center. | Check planning, zoning, setbacks, tree, fire and utility requirements early. |
Commercial work and tenant improvements | Commercial building applications can be submitted online for offices, retail, restaurants, warehouses, schools and medical offices. | Commercial projects may need fire/life safety, accessibility, business license and planning review. |
Electrical work | Electrical permits are required for new electrical service equipment, relocations, service upgrades and fixed appliance or equipment connections. | Use a licensed contractor where required and schedule rough/final inspections before covering work. |
Mechanical work | Mechanical permits are required for heating, ventilating, cooling and refrigeration systems. | Have equipment details ready for HVAC, furnace, AC and refrigeration work. |
Plumbing work | Plumbing permits are required for plumbing, gas, drainage piping and fixture or water heating equipment work. | Water heater, sewer, gas and fixture changes can trigger permit and inspection needs. |
Signs | The city includes signs in the building permit examples. | Check zoning, sign standards and business-license needs before fabricating signs. |
City of San Mateo CSS Portal: Apply, Upload, Pay and Resubmit Online
San Mateo’s Online Permit Center lets users submit building permits, planning applications and private property tree removal applications through the Customer Self-Service CSS Portal.
CSS task | What it helps with | Practical tip |
|---|---|---|
Register account | Create portal access and confirm your email before starting. | Use an email address you monitor because review comments and status updates may arrive through the portal. |
Submit application | Submit building, planning and private tree removal applications securely online. | Select the correct application type from the Apply menu. |
Upload plans and documents | Provide construction drawings, supporting documents and other project materials. | Use clear file names such as Site Plan, Floor Plan, Structural, Energy Forms and Response Letter. |
Pay fees | Pay associated fees securely online by credit card or other available method. | The city notes credit/debit card service fees may apply; cash, check or e-check can avoid those fees where available. |
Respond to comments | Receive comments, provide resubmittals and collaborate with staff. | Do not upload random revised plans. Respond clearly to each correction item. |
Schedule inspections | Schedule new or subsequent building inspections. | Use your permit number and correct inspection type. |
Virtual Over-the-Counter Building Plan Review for Minor Projects
San Mateo offers Virtual Over-the-Counter Building Review for minor projects through the CSS Portal. After submitting the project with all requirements, the city says applicants are contacted within one business day to schedule a virtual building plan review.
Minor project path
VOTC is designed to save time on eligible minor building projects.
Plan checker availability
The city lists plan checkers for VOTC review Monday-Friday, 9:00 AM to 12:00 PM through the CSS Portal.
Complete package required
Submit all required documents first, or the city may not be able to schedule review quickly.
Permit issuance after approval
After approval and payment of all fees, the permit can be issued according to the city’s VOTC process.
How to Apply for a City of San Mateo Building Permit Without Missing Key Details
A complete online application helps avoid resubmittal delays. Start with the official CSS Portal and use the city’s checklists and guidelines before uploading plans.
Step 1: Confirm city jurisdiction
Make sure the property is inside City of San Mateo jurisdiction, not another city or unincorporated county area.
Step 2: Choose the correct permit path
Use the Building Permits page, Online Permit Center and permit application types to choose residential, commercial, VOTC or other routing.
Step 3: Prepare documents
Gather construction drawings, application information, project documents, valuation, contractor details and any required forms.
Step 4: Submit through CSS
Register, confirm your email, select Apply, complete the application and upload plans and materials.
Step 5: Pay and respond
Pay required fees and respond to comments or resubmittal requests through the portal.
Step 6: Schedule inspections
Use CSS to schedule inspections and check the daily inspection schedule by permit number.
How to Schedule City of San Mateo Building Inspections
Building inspections confirm that construction is completed in compliance with codes and the approved permit and plans. San Mateo uses the CSS Portal to schedule new or subsequent building inspections.
Inspection item | Official guidance | Practical tip |
|---|---|---|
Scheduling route | Use the CSS Portal to schedule new or subsequent inspections. | Use your permit number and correct inspection type. |
Before requesting | Have permit number, contractor name, site contact phone, project address, inspection type and desired inspection date ready. | Missing or wrong contact information can delay inspection coordination. |
Inspector trade coverage | Building inspectors are all-trade combinations and can perform all trade inspections. | Clearly request the inspection type, such as rough frame, electric rough or plumbing rough. |
Daily schedule | The daily inspection schedule is posted at 9:00 AM and sorted by Building Permit number. | Find your permit number on the job card, approved plans or permit issuance document. |
2-hour window | An inspector will call by 9:00 AM to confirm the 2-hour inspection window. | Keep the site contact phone available that morning. |
Cancel inspection | To cancel a building inspection, contact the city at 650-522-7172. | Cancel early if work will not be ready or the site will be inaccessible. |
San Mateo Building Forms, Checklists, Guidelines and Project Handouts
San Mateo’s permits and business portal organizes many project-specific documents. Use the official forms and handouts before applying, because requirements differ by project type.
Project resource | Where it appears | When users need it |
|---|---|---|
Accessory buildings | Develop or Renovate a Property resources. | Use for sheds, detached accessory structures and related site work. |
New single-family residence or second story | Develop or Renovate a Property resources. | Use for new homes, second-story additions and major residential projects. |
Commercial building / tenant work | Develop or Add to a Commercial Building resources. | Use for commercial construction, tenant improvements and business-related work. |
Multi-family residential | Develop or Add to a Multi-Family Residence resources. | Use for apartments, condos, townhouses and multi-family construction. |
Electrical permits | Permits and Business License portal. | Use for service upgrades, appliance connections and electrical work. |
Fences | Develop or Renovate a Property resources. | Use before installing or modifying fences. |
Sewer lateral or cleanout | Develop or Renovate a Property resources. | Use when sewer work, cleanout installation or wastewater issues are part of the project. |
Construction and demolition recycling | Permits and Business License portal. | Use for projects that generate demolition or construction debris. |
San Mateo Building Permit Fees and CSS Payment Notes
San Mateo says building permit fees vary by construction type. General building permit fees are based on project valuation, while itemized fees are charged for subcontract permits such as plumbing, electrical, mechanical, sign and fire department life-safety permits.
Valuation-based fees
General building permit fees are based on the project valuation.
Subcontract permit fees
Plumbing, electrical, mechanical, sign and fire/life-safety permits may have itemized fees.
Online payment
CSS lets users pay fees securely online once application fees are available.
Card service fees
The city notes credit/debit card payments are subject to service fees paid to the processing company.
How to Search San Mateo Permit Records and Track a Project
San Mateo’s CSS Portal lets users search records by address, date range, permit number or parcel number. It also supports interactive map search, which can help property buyers, agents and owners review building activity.
Search by address
Use CSS to search permit records by property address when reviewing past work.
Search by permit or parcel
If you have the permit number or parcel number, use those for more targeted lookup.
Use map search
Interactive map search can help when address formatting or parcel details are unclear.
Why San Mateo Building Permits and Inspections Get Delayed
Most delays are preventable. They usually happen because the wrong CSS application type is selected, plan files are incomplete, payment is not made, resubmittal comments are not answered, related permits are missed or inspections are requested before work is ready.
Common delay | What it usually means | How to avoid it |
|---|---|---|
Wrong application type | Project may route incorrectly in CSS. | Review online permit application types before clicking Apply. |
Incomplete plans | Staff cannot confirm scope or code compliance. | Use checklists, guidelines and forms before uploading files. |
Payment not completed | The project may not move forward for review until fees are paid. | Watch CSS fee notices and save receipts after payment. |
Comments not answered | The city is waiting for resubmittal or correction responses. | Respond to each comment clearly and upload corrected files through CSS. |
Related permits missed | Tree, public works, fire, planning, wastewater or business license items may still be open. | Check the Permits and Business License Portal for related applications. |
Inspection not ready | Work is incomplete, covered, inaccessible or missing approved plans. | Request inspection only when the work is ready and job-site documents are available. |
City of San Mateo Building Department Phone Number, Email, Address and Map
Use the official contact information below for building permits, CSS Portal questions, plan review, inspection scheduling, daily inspection schedule, permit status, forms, checklists and related city permit routing.
Building Division
Phone: 650-522-7172
Email: building.info@cityofsanmateo.org
City Hall:
330 West 20th Avenue
San Mateo, CA 94403
Building Counter Hours
Monday: 8:00 AM-12:00 PM and 1:00 PM-4:30 PM
Tuesday: 8:00 AM-12:00 PM; closed in afternoon
Wednesday-Thursday: 8:00 AM-12:00 PM and 1:00 PM-4:30 PM
Friday: 8:00 AM-12:00 PM; afternoon by appointment only
Related permit phone numbers
Parking / events / outdoor seating / public right-of-way: 650-522-7300
Business license: 650-522-7113
Tree permits: 650-522-7420
Inspection schedule
Use the CSS Portal to schedule inspections. The daily inspection schedule is posted at 9:00 AM and sorted by Building Permit number.
Map shows San Mateo City Hall at 330 West 20th Avenue, San Mateo, CA 94403. For most permit activity, start with the official CSS Online Permit Center before visiting or calling.
City of San Mateo Building Department FAQs
These FAQs focus on the most common user searches around San Mateo building permits, CSS Portal, inspections, daily inspection schedule, permit fees, forms, planning, tree permits and official contact details.
QHow do I contact the City of San Mateo Building Department?
Contact the City of San Mateo Building Division at 650-522-7172 or building.info@cityofsanmateo.org. San Mateo City Hall is located at 330 West 20th Avenue, San Mateo, CA 94403.
QWhere do I apply for a City of San Mateo building permit online?
Use the official City of San Mateo Customer Self-Service CSS Online Permit Center. The portal lets users submit building permits, planning applications and private property tree removal applications securely online.
QWhen is a San Mateo building permit required?
Building permits are required to build, enlarge, alter, remove, demolish or repair a structure in the City of San Mateo. This includes houses, garages, commercial construction, tenant improvements and signs.
QAre electrical, mechanical and plumbing permits required in San Mateo?
Yes. Electrical permits are required for new service equipment, service relocations, service upgrades and fixed appliance or equipment connections. Mechanical permits are required for heating, ventilating, cooling and refrigeration systems. Plumbing permits are required for plumbing, gas, drainage piping and fixture or water-heating equipment work.
QHow do I schedule a San Mateo building inspection?
Use the City of San Mateo CSS Portal to schedule new or subsequent building inspections. Have your permit number, project address, inspection type, contractor or site-contact phone and desired inspection date ready.
QWhere can I see the San Mateo daily inspection schedule?
Use the official Daily Building Inspections Schedule page. The city says the schedule is posted daily at 9:00 AM and sorted by Building Permit number.
QWill the San Mateo inspector give a 2-hour inspection window?
Yes. The city says an inspector will call to confirm the 2-hour inspection window by 9:00 AM the morning of the inspection.
QCan San Mateo simple alteration permits be approved while I wait?
The city says simple alteration projects can often be approved while you wait. For specific permit requirements, call a permit technician at 650-522-7172.
QWhat can be submitted through the San Mateo CSS Online Permit Center?
The city says users can submit building permits, planning applications and private property tree removal applications through the CSS Online Permit Center.
QCan I search San Mateo permit records online?
Yes. The CSS Portal lets users search records by address, date range, permit number or parcel number, and the city also mentions interactive map search.
QDo San Mateo tree projects need permits?
San Mateo says all public trees and many privately-owned trees require a permit before pruning or removal. Use the city’s tree permit resources before cutting, pruning or removing trees.
QIs Building-Department.org the official City of San Mateo website?
No. Building-Department.org is an independent guide. Official permit applications, payments, inspections, plan review decisions, planning approvals and code actions must be handled through the City of San Mateo or its official CSS Portal.
Khushboo Bobade is a public records researcher and editorial writer specializing in government service documentation and construction permit systems.
Her research focuses on explaining building permits, inspection procedures, zoning regulations, and public permit records maintained by local government building departments across the United States.
Professional profile: View LinkedIn Profile
Check Permit Type, Estimate Fees, Prepare Inspections and Find Official Building Department Links
Use this free tool before applying for a building permit, booking an inspection, checking zoning rules, or searching permit records. It helps homeowners, contractors, landlords, buyers, and business owners understand the next step before visiting the official building department portal.
What building department task do you need help with?
Choose your goal. The tool will suggest the right next step, what to prepare, and which official page to check.
Before starting work, check whether your project needs building, zoning, electrical, plumbing, mechanical, right-of-way, or HOA approval.
Many portals require contractor registration, license details, insurance, plans, owner authorization, and inspection scheduling access.
Building Permit Type Finder
Select the project type to understand which permits or reviews are commonly required. Always confirm with the official local building department.
Permit Fee Estimate Calculator
Estimate a rough permit fee using project value and common percentage-based review assumptions. Local minimum fees, technology fees, impact fees, reinspection fees, and trade fees can change the final amount.
Inspection Readiness Checklist
Use this before scheduling framing, electrical, plumbing, mechanical, roofing, final, or certificate-related inspections.
Zoning and Setback Pre-check
Use this before applying for a permit when your project may affect land use, setbacks, lot coverage, height, parking, signs, fences, accessory structures, or business use.
Plan Review Timeline Estimator
Estimate how complex your review may be. Local staffing, incomplete plans, corrections, holidays, fire review, zoning review, and outside agency review can change timing.
Permit Records Search Helper
Use this if you are trying to find old permits, inspection history, certificate of occupancy details, open permits, or code-related records.
Official Building Department Resource Finder
Enter city/county and state to create safe searches for official permit portals, inspection scheduling, building codes, zoning maps, forms, fees, and contact pages.
Building Department vs Planning/Zoning
- Building Department: permits, plan review, inspections, code compliance, certificates.
- Planning/Zoning: land use, setbacks, height, lot coverage, signs, parking, variances.
Best sitewide placement
Place this tool after the first main guide section or before FAQs. It turns a normal article into a practical permit-preparation page.
Important note
This tool gives educational guidance only. Final permit requirements, fees, inspections, forms, and deadlines must be confirmed with the official local building department.