What an ADU costs in Alhambra (2026)
Alhambra runs its own ADU permits and gives faster review to pre-approved plans. Here are typical numbers, the local rules, and your next step.
Typical ADU numbers in Alhambra
- 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 $3,750 a month for 750 sq ft.
- Home value nearby: about $650 per sq ft (County median area).
Run the free ADU and new home cost calculator for Alhambra
ADU permits and local rules in Alhambra
Who runs permits
City of Alhambra Planning Division and Building Division, with Fire and Public Works review.
Pre-approved ADU plans
Alhambra's code says a detached ADU built from a pre-approved plan gets a decision in 30 days. Ask us which plans are on the city list.
What can slow you down
- Homes on a historic register may face extra rules.
- Fire and Public Works charge their own plan check fees.
Sources: Alhambra Municipal Code section 23.22.040 (ADUs). State ADU law. General information, not legal advice. Updated October 2026.
Free lot check in Alhambra
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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