Lot Coverage Limits: Altadena vs Santa Clarita
How do lot coverage limits rules compare between Altadena, CA and Santa Clarita, CA?
Altadena and Santa Clarita have similar restriction levels.
Altadena, CA
Los Angeles County
Altadena R-1 max Gross Structural Area (GSA) and lot coverage = (0.25 × net lot area) + 1,000 sq ft, never exceeding 9,000 sq ft total (Altadena CSD 22.306.070.A.4).
View full Altadena rules →Santa Clarita, CA
Los Angeles County
Lot coverage varies by zone and is set in SCMC Chapter 17.57. Outdoor storage areas must be screened by 6 ft walls. No mechanical equipment in front setbacks.
View full Santa Clarita rules →Key Facts Comparison
| Fact | Altadena | Santa Clarita |
|---|---|---|
| Code Section | Altadena CSD 22.306.070.A.4 | SCMC 17.57 |
| GSA Formula | 0.25 × lot area + 1,000 sf | - |
| Maximum Cap | 9,000 sq ft | - |
| Excluded From GSA | Cellars + auto garages/carports | - |
| Coverage | - | Varies by residential zone |
| Outdoor Storage | - | Must be screened by 6 ft wall |
| Front Yard | - | No portable canopies |
Highlighted rows indicate differences between cities.
Altadena FAQ
How big a house can I build on a 10,000-sq-ft Altadena lot?
Maximum GSA = 0.25 × 10,000 + 1,000 = 3,500 sq ft (excluding garage and cellar). The absolute cap is 9,000 sq ft on any lot.
Santa Clarita 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 Clarita zoning for your district’s maximum.
Compare other topics
See how Altadena and Santa Clarita compare on other ordinance categories.
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