What an ADU costs in Whittier (2026)
Whittier runs its own ADU permits and offers free preapproved ADU plans. Here are typical numbers, the local rules, and your next step.
Typical ADU numbers in Whittier
- 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 Whittier
ADU permits and local rules in Whittier
Who runs permits
City of Whittier Community Development: the Planning Division and Building.
Pre-approved ADU plans
Yes. The city gives out preapproved ADU plans for free. You sign a hold harmless form, and you can't change the plans.
What can slow you down
- Hillside lots near the Puente Hills may face fire zone rules.
- Historic homes may need extra review.
- You still need a full site plan and energy report.
Sources: City of Whittier Preapproved ADU Plans page; Whittier hold harmless form. State ADU law. General information, not legal advice. Updated October 2026.
Free lot check in Whittier
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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