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
Sequoia Avenue Condominium Subdivision

The applicant is seeking a Major Subdivision to construct a new four-story, 23-unit residential condominium building that includes a ground-level garage for 33 parking spaces, bike lockers, and storage on a legal 18,951 sq. ft parcel in the Sequoia Tract area of San Mateo County.

Moss Beach State Route 1 Congestion & Safety Improvements Project

The County of San Mateo and the San Mateo County Transportation Authority (TA), in cooperation with the California Department of Transportation (Caltrans), are initiating 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 to include assessments of the County’s housing need over the next eight years, policies and programs to address that need, and identification of available locations for housing development.

Palmer Lane General Plan Map and Zoning Map Amendments, Subdivision and Grading

Project Number PLN2018-00271 Location 501 Palmer Lane, North Fair Oaks

Zmay Minor Subdivision

Project Number PLN2014-00410 Contact Erica D. Adams, Project Planner (650) 363-1828

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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