City of Los Altos pre-approved ADU plans

The pre-approved ADU plans City of Los Altos publishes, copied as published, with a link to the official page and the date A-du last checked it.

Official page: https://www.losaltosca.gov/211/Accessory-Dwelling-Units-ADUs (A-du last checked it October 29, 2026).

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.

The plans

1-Bedroom

Bedrooms:
1
Designer:
Not named on the agency page
Status:
No status label on the agency page

The agency page says: “Modifications to the City plans are not allowable.”

Agency page for this planSee it on A-du Build

Listed on the agency page when A-du checked it on October 29, 2026.

2-Bedroom

Bedrooms:
2
Designer:
Not named on the agency page
Status:
No status label on the agency page

The agency page says: “Modifications to the City plans are not allowable.”

Agency page for this planSee it on A-du Build

Listed on the agency page when A-du checked it on October 29, 2026.

Studio/1-Bedroom

Bedrooms:
Studio or 1
Designer:
Not named on the agency page
Status:
No status label on the agency page

The agency page says: “Modifications to the City plans are not allowable.”

Agency page for this planSee it on A-du Build

Listed on the agency page when A-du checked it on October 29, 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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