County of Los Angeles (unincorporated) pre-approved ADU plans
The pre-approved ADU plans County of Los Angeles (unincorporated) publishes, copied as published, with a link to the official page and the date A-du last checked it.
Pre-approved ADU plans
County of Los Angeles (unincorporated)
3 plans in the index·3 on A-du Build
A-du last checked the official page on October 26, 2026.
The plans
Free plan
Build $359k to $615k
Free plan
Build $359k to $615k
Free plan
Build $268k to $459k
A-du is not affiliated with HCD or any city or county. This page copies what each agency publishes about its pre-approved ADU plans and links to the official page. Check the agency's page before you rely on anything here. Nothing on this page is legal advice.
Each plan as the agency publishes it
The details below are copied from the agency’s own pages, field by field, with the date A-du last checked each plan.
Standard ADU Plan A
- Description:
- Standard ADU Plan A (1,200 square feet - 3 bedrooms, 1 bathroom)
- Size:
- 1,200 square feet - 3 bedrooms, 1 bathroom
- Bedrooms:
- 3
- Bathrooms:
- 1
- Designer:
- Not named on the agency page
- Status:
- No status label on the agency page
- Code cycle:
- 2025 California Building Code (listed on plan sheet)
The agency page says: “These Pre-approved ADU Standard Plans cannot be revised and must be permitted as designed.”
Agency page for this planSee it on A-du Build
Listed on the agency page when A-du checked it on October 19, 2026.
Standard ADU Plan B
- Description:
- Standard ADU Plan B (1,200 square feet - 2 bedrooms, 1 bathroom)
- Size:
- 1,200 square feet - 2 bedrooms, 1 bathroom
- Bedrooms:
- 2
- Bathrooms:
- 1
- Designer:
- Not named on the agency page
- Status:
- No status label on the agency page
- Code cycle:
- 2025 California Building Code (listed on plan sheet)
The agency page says: “These Pre-approved ADU Standard Plans cannot be revised and must be permitted as designed.”
Agency page for this planSee it on A-du Build
Listed on the agency page when A-du checked it on October 19, 2026.
Standard ADU Plan C
- Description:
- Standard ADU Plan C (800 square feet - 1 bedroom, 1 bathroom)
- Size:
- 800 square feet - 1 bedroom, 1 bathroom
- Bedrooms:
- 1
- Bathrooms:
- 1
- Designer:
- Not named on the agency page
- Status:
- No status label on the agency page
- Code cycle:
- 2025 California Building Code (listed on plan sheet)
The agency page says: “These Pre-approved ADU Standard Plans cannot be revised and must be permitted as designed.”
Agency page for this planSee it on A-du Build
Listed on the agency page when A-du checked it on October 19, 2026.
Getting a plan permitted
A pre-approved plan still needs a building permit for your lot. For free plans published by a California city or county, you can request an optional flat-fee service, Permitting by Chris Koss, AIA. Chris Koss, AIA, a California-licensed architect who owns A-du, provides this permitting service personally under a separate written agreement with you (the Permitting Services Agreement). It is not performed by A-du, and A-du takes no part of his fee. You can always take a free plan straight to your building department instead. Open any plan on A-du Build to see what applies to it.
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