ADU Rules in Pasadena.
Local ADU regulations, permit fees, setback requirements, and typical timelines for Pasadena. Last updated 2026-05-27.
Pasadena ADU Requirements
Attached ADU: up to 25 ft
Most of Pasadena qualifies for the transit proximity exemption.
Design 4 weeks · Permit 6 weeks · Build 36 weeks
Plain-language summary
In Pasadena, a detached ADU requires a minimum 4-foot side setback and 4-foot rear setback. The maximum height for a detached ADU is 16 feet, while an attached ADU may be up to 25 feet. The maximum size for a detached ADU is 1,200 sq ft; a Junior ADU (JADU) is limited to 500 sq ft. Replacement parking is not required for most projects. Typical permit fees range from $7,000 to $14,000. A typical project takes approximately ~11 months from design start to move-in, including 4 weeks of design, 6 weeks for permit review, and 36 weeks of construction.
⚠️ ADU rules change frequently. Always verify current requirements with the Pasadena Building & Safety Department before submitting plans. Official source →
What to Watch Out For
- Historic District Overlay Zones (Old Pasadena, Bungalow Heaven, Madison Heights, etc.) require Design Review Board approval — allow 4–6 additional weeks.
- For properties in historic districts, demolition of existing structures may be restricted.
- Pasadena offers an ADU pre-application checklist that can streamline the process.
How Long Does It Take to Get an ADU Permit in Pasadena?
Site study, floor plans, elevations, structural drawings.
Plan check, corrections, and permit issuance by Pasadena Building & Safety.
Foundation, framing, MEP rough-in, finishes, final inspection.
A licensed engineer on your lot, free.
30 minutes. We walk the property, figure out what's feasible, and answer any questions you have.
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