Shed permit rules in Altadena, CA — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
Sheds 120 sq ft or smaller and ≤12 ft tall typically don't need a building permit in Altadena, but they still must comply with Altadena CSD setbacks. Anything larger needs a permit.
Under California Building Code §105.2 (adopted via LA County Title 26), one-story detached accessory structures used as tool/storage sheds are exempt from building permits if the floor area is ≤120 sq ft. Electrical, plumbing, and mechanical work still require permits regardless of size. The structure must still comply with Altadena CSD setbacks (typically 5 ft side, 5 ft rear in R-1) and the lot-coverage formula in CSD 22.306.070.A.4 (max GSA/lot coverage = 0.25 × lot area + 1,000 sq ft, capped at 9,000 sq ft).
Sheds over 120 sq ft without a permit are a building/zoning violation — can require retroactive permit, removal, or a Variance.
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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 shed rules.
See how Altadena's shed rules rules stack up against other locations.
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