What an ADU costs in Santa Clarita (2026)
Santa Clarita runs its own ADU permits, but LA County Fire and other groups also sign off. Here are typical numbers, the local rules, and your next step.
Typical ADU numbers in Santa Clarita
- 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 $3,400 a month for 750 sq ft.
- Home value nearby: about $550 per sq ft (Inland and east area).
Run the free ADU and new home cost calculator for Santa Clarita
ADU permits and local rules in Santa Clarita
Who runs permits
City of Santa Clarita Planning Division, then Building and Safety. LA County Fire reviews too.
Pre-approved ADU plans
We didn't find a pre-approved ADU plan program. Ask us for the latest.
What can slow you down
- In high fire zones, the ADU needs safe road access.
- Oak trees on the lot need an Urban Forestry sign-off.
- Lots on septic need LA County Health review.
Sources: City of Santa Clarita ADU handout; Santa Clarita Building and Safety ADU plan requirements. State ADU law. General information, not legal advice. Updated October 2026.
Free lot check in Santa Clarita
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.
More cost guides for Santa Clarita
- What a new home costs in Santa Clarita
- What a restaurant, shop or office build-out costs in Santa Clarita
- What an apartment building costs in Santa Clarita
Cost guides for more of LA County
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