A Resident's Guide to San Mateo's Local Ordinances

San Mateo is a mid-sized city in San Mateo County, California, with about 106000 residents. Like most cities its size, it has a set of local rules that may differ significantly from neighboring municipalities. Here is an overview of 106 ordinances across 25 categories that affect daily life in San Mateo.

Environmental Rules

Coastal Development: The City of San Mateo is located on the eastern (bay) side of the San Francisco Peninsula and is not within the California Coastal Zone. The California Coastal Commission has no jurisdiction in San Mateo, and no Coastal Development Permit is required for projects in the city..

Also covered: Flood Zones (moderate), Stormwater Management (moderate), Grading & Drainage (moderate). See the full environmental rules guide for San Mateo for details.

Soliciting & Door-to-Door

Solicitor Permits: Solicitors and peddlers in San Mateo must comply with city business licensing requirements. The city regulates commercial solicitation to protect residents from aggressive or fraudulent practices.

Also covered: No-Knock Registry (moderate). See the full soliciting & door-to-door guide for San Mateo for details.

Landscaping Rules

Weed Ordinances: San Mateo requires property owners to maintain their lots free of overgrown weeds, dead vegetation, and fire hazards. Code Enforcement addresses complaints about unmaintained vegetation.

Also covered: Tree Trimming (moderate), Water Restrictions (moderate), Grass Height Limits (moderate). See the full landscaping rules guide for San Mateo for details.

Trash & Recycling

Bulk Item Disposal: Recology San Mateo County provides scheduled bulk item pickups for residential customers. Additional large items may be taken to the Ox Mountain Landfill or Shoreway Environmental Center.

Also covered: Recycling Requirements (moderate), Pickup Rules & Schedules (moderate), Bin Placement Rules (moderate). See the full trash & recycling guide for San Mateo for details.

Noise Ordinances

Construction Hours: San Mateo limits permitted construction to 7 AM–7 PM weekdays, 9 AM–5 PM Saturdays, and noon–4 PM Sundays/holidays. Equipment cannot exceed 90 dB at 25 feet.

Also covered: Aircraft Noise (moderate), Quiet Hours (strict), Barking Dogs (moderate). See the full noise ordinances guide for San Mateo for details.

Outdoor Lighting

Light Trespass: San Mateo addresses light trespass through zoning development standards and nuisance provisions. New development must shield exterior lighting.

Also covered: Dark Sky Rules (permissive). See the full outdoor lighting guide for San Mateo for details.

Property Maintenance

Property Blight: San Mateo enforces property maintenance standards through Code Enforcement. Blight conditions including overgrown vegetation, accumulated junk, graffiti, and dilapidated structures are subject to enforcement.

Also covered: Garage Sale Rules (permissive), Vacant Lot Maintenance (moderate), Snow & Sidewalk Clearing (permissive). See the full property maintenance guide for San Mateo for details.

Drone Rules

Recreational Drones: Recreational drone flying in San Mateo must comply with FAA regulations. Drones are prohibited in San Mateo County parks.

Also covered: Commercial Drones (moderate). See the full drone rules guide for San Mateo for details.

Fire Regulations

Smoke Detectors: The City of San Mateo enforces smoke alarm and carbon monoxide alarm requirements through the California Residential Code (CRC R314 and R315) as adopted under San Mateo Municipal Code Title 23, plus California Health & Safety Code Sections 13113.7 and 17926. Alarms are required in every sleeping room, outside each separate sleeping area, and on every story including basements.

Also covered: Fire Pit Rules (strict), Fireworks (strict), Outdoor Burning (strict). See the full fire regulations guide for San Mateo for details.

Short-Term Rentals

Registration Rules: The City of San Mateo requires every short-term rental host to obtain a Short-Term Rental Registration under San Mateo Municipal Code Chapter 5.66 before advertising or accepting guests. Hosts must also hold a city Business License, file a Transient Occupancy Tax (TOT) certification, and follow operating standards.

Also covered: Night Caps (strict), Noise Rules (moderate), Parking Rules (moderate). See the full short-term rentals guide for San Mateo for details.

Rental Property Rules

Just Cause Eviction: San Mateo adopted an emergency just cause eviction ordinance (Ord. 2019-12) providing local protections that complement AB 1482.

Also covered: Rent Control (moderate), Rental Registration (permissive). See the full rental property rules guide for San Mateo for details.

Animal Ordinances

Wildlife Feeding: Wildlife feeding in San Mateo is discouraged through the city's nuisance provisions and California Fish and Game Code Section 251.1 which prohibits feeding big game mammals. San Mateo County Animal Control handles wildlife complaints.

Also covered: Breed Restrictions (moderate), Exotic Pets (moderate), Dog Leash Laws (moderate). See the full animal ordinances guide for San Mateo for details.

Accessory Structures

ADU Rules: San Mateo allows ADUs in all residential zones (SMMC Ch. 27.19).

Also covered: Shed Rules (moderate), Garage Conversions (moderate), Carport Rules (moderate). See the full accessory structures guide for San Mateo for details.

Parking Rules

RV & Boat Parking: San Mateo bans RVs, oversized vehicles (7.5+ ft tall/wide or 22+ ft long), and unattached trailers from residential streets. Exception allows RV owners to park in front of their own residence for 24 hours, twice per week..

Also covered: Street Parking Limits (moderate), Driveway Rules (moderate), Commercial Vehicle Restrictions (moderate). See the full parking rules guide for San Mateo for details.

Home Business

Home Daycare: Small family daycare homes (up to 8 children) are permitted by right in all residential zones under California H&S Code Section 1597.45. Large family daycare homes (9-14 children) require a conditional use permit.

Also covered: Customer Traffic Restrictions (moderate), Zoning Restrictions (moderate), Signage Rules (moderate). See the full home business guide for San Mateo for details.

Fence Regulations

Pool Barriers: Pool barriers in San Mateo must comply with the California Building Code (Title 24 Chapter 31) and the Swimming Pool Safety Act. Barriers must be at least 60 inches high with self-closing, self-latching gates.

Also covered: Permit Requirements (moderate), Neighbor Fence Rules (moderate), Height Limits (moderate). See the full fence regulations guide for San Mateo for details.

Swimming Pools & Spas

Fencing Requirements: San Mateo pools must comply with CA H&S §115920: minimum 60-inch (5 ft) barrier, self-closing/self-latching gates, ground clearance under 2 inches, no gaps over 4 inches. Two additional drowning prevention features required..

Also covered: Safety Rules (moderate), Above-Ground Pools (moderate), Pool Permits (moderate). See the full swimming pools & spas guide for San Mateo for details.

Cannabis Regulations

Dispensary Zoning: San Mateo prohibits all cannabis dispensaries and commercial cannabis operations within city limits under Chapter 7.45 (Ordinance 2017-4). No storefront, mobile, or delivery cannabis businesses are permitted.

Also covered: Home Cultivation (strict). See the full cannabis regulations guide for San Mateo for details.

Food Trucks & Mobile Vendors

Food Truck Permits: Food trucks in San Mateo require a San Mateo County Health Permit for mobile food operations and compliance with city zoning and business licensing requirements. Food trucks on private property require property owner consent.

Also covered: Vending Zones (moderate). See the full food trucks & mobile vendors guide for San Mateo for details.

Sign Regulations

Garage Sale Signs: Garage sale signs in San Mateo must comply with Chapter 25 of the sign code. Signs may not be placed on public property or utility poles.

Also covered: Holiday Displays (permissive), Political Signs (permissive). See the full sign regulations guide for San Mateo for details.

Tree Protection

Heritage & Protected Trees: San Mateo has a Protected Trees ordinance (Chapter 13.40) covering Heritage Trees, Street Trees, and trees designated through planning. Heritage Trees are oaks 10 inches+ diameter and other species 15 inches+ at 54 inches above grade.

Also covered: Tree Replacement Requirements (strict), Tree Removal Permits (strict). See the full tree protection guide for San Mateo for details.

Building Setbacks & Zoning

Setback Rules: San Mateo establishes minimum residential setbacks by zone district in Title 27, Chapter 27.22 and the building line/setback standards in Section 27.38.100. Single-family zones require front setbacks of 20-25 feet, side yards of 5-10 feet, and rear yards of 20 feet or 20% of lot depth..

Also covered: Lot Coverage Limits (moderate), Structure Height Limits (moderate). See the full building setbacks & zoning guide for San Mateo for details.

Curfew Laws

Juvenile Curfew: The City of San Mateo does not maintain a local juvenile curfew ordinance. San Mateo County enacted an emergency countywide curfew during the 2020 civil unrest but that was temporary.

Also covered: Park Curfew (moderate). See the full curfew laws guide for San Mateo for details.

Garage & Yard Sales

Frequency Limits: San Mateo does not impose specific numerical limits on garage sale frequency. Frequent or continuous sales resembling retail operations may be cited as unauthorized commercial activity in residential zones under the zoning code..

Also covered: Time Restrictions (permissive), Garage Sale Permits (permissive). See the full garage & yard sales guide for San Mateo for details.

Solar Energy

Panel Permits: San Mateo provides streamlined solar permitting as required by AB 2188 and SB 1222. Residential rooftop systems meeting standard criteria receive ministerial (non-discretionary) approval.

Also covered: HOA Restrictions (permissive). See the full solar energy guide for San Mateo for details.

What to Do With This Information

This overview covers the big picture, but the details matter. Each ordinance page for San Mateo includes the full text, violation penalties, and frequently asked questions. Use those pages when you need specifics.