What an ADU costs in Lancaster (2026)
Lancaster runs its own ADU permits and has a well-known set of city ADU plans. Here are typical numbers, the local rules, and your next step.
Typical ADU numbers in Lancaster
- 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 Lancaster
ADU permits and local rules in Lancaster
Who runs permits
City of Lancaster Planning and the Building and Safety Division.
Pre-approved ADU plans
Yes. Lancaster offers five pre-approved ADU designs (Poppy, Juniper, Goldenbrush, Primrose and Sunflower). Each comes in California Ranch or Mediterranean style.
What can slow you down
- You still need a site plan made for your lot.
- Rural lots may be on septic and need extra checks.
Sources: City of Lancaster Pre-Approved ADU Plans page. State ADU law. General information, not legal advice. Updated October 2026.
Free lot check in Lancaster
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 Lancaster
- What a new home costs in Lancaster
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- What an apartment building costs in Lancaster
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