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).
Section 22.306.070.A.4 of the Altadena CSD limits residential GSA and lot coverage by the formula: (0.25 × net lot area) + 1,000 square feet, with an absolute cap of 9,000 sq ft regardless of lot size. GSA includes total floor area of all enclosed areas including storage, but excludes cellars and garages/carports designed and used for automobile storage. Lot coverage includes all structures on the property. The Altadena CSD also applies the 23-ft height cap within 15 ft of property lines and the 2-story limit.
Exceeding GSA or coverage requires a Variance (Ch. 22.194). Permits will not be issued for projects in excess of these caps.
Altadena, CA
LA County allows backyard chickens in R-1 zones in unincorporated areas (including Altadena) subject to coop setbacks under LA County Code Title 10 and Title...
Altadena, CA
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Altadena, CA
Trimming protected oak trees (≥8 in DBH) requires an Oak Tree Permit if the work enters the protected zone or removes >25% of crown. Street trees in the publ...
Altadena, CA
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Altadena, CA
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Altadena, CA
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Side-by-side rule comparisons with other cities in Los Angeles County.
See how other cities in Los Angeles County handle lot coverage limits.
See how Altadena's lot coverage limits rules stack up against other locations.
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