Lot Coverage Limits: Castaic vs Santa Monica
How do lot coverage limits rules compare between Castaic, CA and Santa Monica, CA?
Castaic and Santa Monica have similar restriction levels.
Castaic, CA
Los Angeles County
Lot coverage in unincorporated LA County varies by zoning district under Title 22. Community Standards Districts may impose additional lot coverage restrictions. Residential zones typically limit coverage to maintain open space, with specific percentages set by zone classification.
View full Castaic rules →Santa Monica, CA
Los Angeles County
Lot coverage in Santa Monica varies by zoning district. R1 district development standards are in Table 9.07.030. The zoning ordinance limits impervious coverage and includes landscape area requirements per SMMC Ch. 9.26.
View full Santa Monica rules →Key Facts Comparison
| Fact | Castaic | Santa Monica |
|---|---|---|
| Varies By | Zoning district and CSD | - |
| Residential | Zone-specific percentage limits | - |
| ADU Exception | State law guarantees 800 sq ft min | - |
| Reference | Title 22, Division 6 | - |
| R1 Standards | - | Table 9.07.030 |
| Landscape Area | - | SMMC Ch. 9.26 requirements |
| Impervious | - | Limited by district |
| Code | - | SMMC Article 9, Division 2 |
Highlighted rows indicate differences between cities.
Castaic FAQ
What is the maximum lot coverage in LA County residential zones?
It varies by zone. R-1 zones typically allow 35-45% lot coverage. R-2 and R-3 zones may allow 40-60%. Check your specific zone in Title 22 or contact the Department of Regional Planning at (213) 974-6411.
Do ADUs count toward lot coverage in LA County?
No. Under California state law (Gov Code 65852.2), ADUs are exempt from lot coverage maximums, floor area ratio limits, and open space requirements.
What counts as lot coverage?
All roofed structures including the main house, garage, carport, and accessory buildings. Uncovered decks, patios, and driveways are generally excluded from coverage calculations.
Santa Monica FAQ
What counts as lot coverage?
All impervious surfaces: buildings, garages, driveways, patios, and walkways. Permeable pavers may be partially excluded.
How do I calculate my lot coverage?
Divide total impervious surface area by total lot area. Check Santa Monica zoning for your district’s maximum.
Compare other topics
See how Castaic and Santa Monica compare on other ordinance categories.
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