Unincorporated San Mateo County permits residential holiday decorations without permits. Displays must comply with electrical code, not obstruct public rights-of-way, and respect noise ordinance quiet hours (10 PM to 7 AM). Coastal zone properties may have additional restrictions.
San Mateo County does not regulate residential holiday decorations through specific ordinance, treating them as protected expression. No permits required for typical home displays. Electrical installations must use UL-listed outdoor-rated equipment per California Electrical Code (Title 24, Part 3) and not overload circuits; GFCI protection required for outdoor outlets. Inflatables must be secured against Pacific coastal winds. Displays cannot obstruct sidewalks, driveways, or sight triangles at intersections. Amplified music or sound effects must comply with Ordinance Code Chapter 4.88 (noise) — 60 dBA daytime, 50 dBA 10 PM–7 AM at property line. Coastside areas (Montara, Moss Beach, El Granada, Pescadero) may have stricter dark-sky limits affecting light displays. HOA communities in Emerald Hills and other subdivisions may impose additional timing rules (typically Thanksgiving through January 10).
Obstruction of public way: notice to correct. Electrical hazard: Building Department may order removal. Noise violations: Sheriff's response, $100-$500 fine. HOA fines governed by CC&Rs. Coastal Commission permits may be triggered in sensitive habitat areas.
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