About Us

Welcome to the County of San Mateo Planning and Building Department. Our mission is to plan and regulate land use and development within the county's unincorporated areas so that diverse and livable communities can thrive. We serve the County's residents, businesses, and visitors by preparing and administering land use plans and regulations and reviewing land use proposals to ensure they are consistent with those plans and regulations.

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Major Projects
Get There Together: An Action Plan for Transportation Choices in Half Moon Bay and the Midcoast

An action plan of strategies to improve and make better use of the transportation options we already have on the coastside today.

North Fair Oaks Rezoning and General Plan Amendment Project & EIR

A Draft Environmental Impact Report (DEIR) for the North Fair Oaks Rezoning and General Plan Amendment Project is now available.

Sequoia Avenue Condominium Subdivision

The applicant is seeking a Major Subdivision to construct a new four-story, 23-unit residential condominium building.

Moss Beach State Route 1 Congestion & Safety Improvements Project

A project to study improvements along State Route 1 (SR-1) in Moss Beach.

San Mateo County Housing Element Update 2023-2031

San Mateo County is updating its Housing Element.

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Planning and Building Department – Main Office
455 County Center
2nd Floor
Redwood City, CA 94063Get Directions
Monday - Thursday:
8:00 am - 4:00 pm
(closed 12:00 pm - 1:00 pm for lunch)
Friday - Sunday:
Contact Information
Main Phone: (650) 363-4161 Planning Counter: (650) 363-1825 Building Inspection: (650) 599-7311 Code Compliance: (650) 363-4825 Automated Inspection Scheduling: (650) 295-3650 Email: plngbldg@smcgov.org