Structure Height Limits: Castaic vs Santa Monica
How do structure height limits rules compare between Castaic, CA and Santa Monica, CA?
Castaic and Santa Monica have similar restriction levels.
Castaic, CA
Los Angeles County
Building height limits in unincorporated LA County are set by Title 22 zoning district. Height limit exceptions exist for elevator shafts, stairwells, and similar features per Section 22.110.060.C. Community Standards Districts may impose stricter height requirements.
View full Castaic rules →Santa Monica, CA
Los Angeles County
Building height in Santa Monica R1 districts is limited to 28 ft. Vertical wall height is limited to 23 ft for flat-roofed structures. No more than 25% of any facade may be mirrored or highly reflective material.
View full Santa Monica rules →Key Facts Comparison
| Fact | Castaic | Santa Monica |
|---|---|---|
| Varies By | Zone and Community Standards District | - |
| Exceptions | Elevator shafts, stairwells exempt | - |
| ADU Detached | 16 ft per state law | - |
| Reference | Title 22, Section 22.110 | - |
| R1 Max | - | 28 feet |
| Wall Height | - | 23 ft for flat roofs |
| Reflective Material | - | Max 25% of any facade |
| Code | - | SMMC Ch. 9.07 |
Highlighted rows indicate differences between cities.
Castaic FAQ
How tall can I build in unincorporated LA County?
In most R-1 residential zones, the limit is 35 feet or 2.5 stories, whichever is less. Height limits vary by zone. Check your zoning district in Title 22 or at planning.lacounty.gov.
How is building height measured?
Height is measured from the lowest point of the natural or finished grade (whichever is lower) to the highest point of the roof, including ridges and equipment.
Can I get a height exception?
Yes, through a Conditional Use Permit or variance from the Regional Planning Commission. This requires a public hearing and demonstration that the exception is justified. Contact (213) 974-6411.
Santa Monica FAQ
What is the max height for a house?
Typically 35 feet or 2.5 stories in residential zones. Check Santa Monica zoning code for your specific district.
Do chimneys count toward height?
Chimneys and similar projections are usually exempt up to a limited additional height above the roof.
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