Lot Coverage Limits: Altadena vs Torrance
How do lot coverage limits rules compare between Altadena, CA and Torrance, CA?
Altadena and Torrance 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 →Torrance, CA
Los Angeles County
Front yards may not be paved more than 50% and must have maintained landscaping. Lot coverage ratios vary by zoning district under TMC Division 9.
View full Torrance rules →Key Facts Comparison
| Fact | Altadena | Torrance |
|---|---|---|
| Code Section | Altadena CSD 22.306.070.A.4 | TMC 92.5.14 |
| GSA Formula | 0.25 × lot area + 1,000 sf | - |
| Maximum Cap | 9,000 sq ft | - |
| Excluded From GSA | Cellars + auto garages/carports | - |
| Front Yard Paving | - | Max 50% |
| Landscaping | - | Must be maintained |
| Coverage by Zone | - | Varies (R-1, R-2, etc.) |
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.
Torrance 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 Torrance zoning for your district’s maximum.
Compare other topics
See how Altadena and Torrance compare on other ordinance categories.
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