Dark Sky Rules: San Mateo vs South San Francisco
How do dark sky rules rules compare between San Mateo, CA and South San Francisco, CA?
San Mateo has fewer restrictions than South San Francisco.
San Mateo, CA
San Mateo County
San Mateo does not have a dedicated dark sky ordinance. Outdoor lighting on new development is regulated through the zoning code to minimize glare and light trespass. California Title 24 energy code sets efficiency requirements for outdoor lighting.
View full San Mateo rules →South San Francisco, CA
San Mateo County
Unincorporated San Mateo County has no countywide dark-sky ordinance, but the Development Code's design standards require exterior lighting to be designed and located so that direct light and glare are confined to the site and directed away from neighbors, with low-level, downward-directed lighting encouraged.
View full South San Francisco rules →Key Facts Comparison
| Fact | San Mateo | South San Francisco |
|---|---|---|
| Dark Sky Ordinance | None | - |
| New Development | Shielded, downward lighting required | - |
| Energy Code | CA Title 24 applies | - |
| Light Trespass | Nuisance complaint available | - |
| Contact | Code Enforcement — 650-522-7200 | - |
| Countywide Dark-Sky Ordinance | - | None (design standards apply) |
| Governing Code | - | Development Code (Title 8) design standards |
| Core Standard | - | Light/glare confined to site |
| Preferred Lighting | - | Low-level, downward-directed |
| Scenic Corridors | - | Minimize light and glare |
| Coastal Zone | - | Coastside Design Review / CDP |
Highlighted rows indicate differences between cities.
San Mateo FAQ
Does San Mateo have dark sky rules?
No standalone ordinance. New development must have shielded, downward-directed lighting per zoning standards.
Can I complain about bright neighbor lights?
Yes. File a nuisance complaint with Code Enforcement at 650-522-7200.
South San Francisco FAQ
Does unincorporated San Mateo County have a dark-sky ordinance?
Not as a single countywide ordinance. Instead, the Development Code's design standards require exterior lighting to confine light and glare to the site and direct it away from neighbors, encouraging low-level downward lighting.
What lighting standard applies to new homes?
County single-family design standards require all exterior, landscape, and site lighting to be designed so light and glare are directed away from neighbors and confined to the site, minimized, and architecturally integrated.
Are there stricter lighting rules near the coast?
Yes. In the Coastal Zone, outdoor lighting is reviewed through the Coastal Development Permit and Coastside Design Review process so that light and glare are contained on the parcel and not visible from adjacent uses or public views.
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