What an ADU costs in Pasadena (2026)
Pasadena runs its own permits and its own ADU rules, on top of state law. Here are typical numbers, the local rules, and your next step.
Typical ADU numbers in Pasadena
- A 750 sq ft backyard ADU with a standard finish costs about $300,000 to build, all in: building, site work, city fees and design.
- Typical ADU rent: about $4,300 a month for 750 sq ft.
- Home value nearby: about $850 per sq ft (Close-in area).
Run the free ADU and new home cost calculator for Pasadena
ADU permits and local rules in Pasadena
Who runs permits
City of Pasadena, Planning & Community Development (planning and building permits).
Pre-approved ADU plans
Yes. Pasadena has a free ADU Standard Plans Program. The main plan is a 374 sq ft studio. Other plans are only for Eaton Fire lots. Plan check takes about 3 to 4 weeks. The plans can't be used on hillside or slope lots.
What can slow you down
- Many historic districts and landmarks. They can add design review.
- Hillside and fire zones in some areas. These can limit ADU size.
- Eaton Fire lots have their own rebuild rules.
Sources: City of Pasadena ADU Standard Plans Program page. State ADU law. General information, not legal advice. Updated October 2026.
Free lot check in Pasadena
Send Hemisphere A&E your address. We look up your zoning and lot size, what fits (ADU, junior ADU, SB 9, new home, apartments, remodel or business space), red flags like fire zones or hillside rules, and a rough cost range. No cost, no pressure. Email info@hemisphereae.com or call (619) 762-7144.
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