About Us

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

View more

Find My Zoning Permit Center Make an Appointment Flood Hazard Resources All Public Meetings How Are We Doing?
Major Projects
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

View All Major Projects
trees.jpgSignificant & Heritage Trees houses logoHome for All Graphic of person at help deskDepartment Services
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 - 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