Civic Data Works · Plans catalog · City of Los Altos

City of Los Altos — preapproved ADU plans

City of Los Altos ( County) posts 9 preapproved accessory dwelling unit plans on its own website, verified 2026-08-07.

Agency: City of Los Altos
County
Plans posted: 9
Verified: 2026-08-07

What’s posted

Los Altos posts 9 free 'City Permit-Ready ADU' plan sets (3 unit sizes x 3 architectural styles, 525-1,190 sf), each with architectural drawings, title sheet, and CalGreen checklist PDFs stated as 'developed for the City of Los Altos and available free of charge,' plus 3 additional privately-designed preapproved plans requiring designer contact.

Sources: https://www.losaltosca.gov/211/Accessory-Dwelling-Units-ADUs, https://www.losaltosca.gov/DocumentCenter/View/257

Second independent WebFetch of one plan document (DocumentCenter/View/257) confirmed a real, valid 344KB PDF file (PDF-1.7 header, drawing-object structure) rather than a broken/placeholder link, though its text content could not be OCR'd by the fetch tool.

Any other agency can adopt these plans

Cal. Gov. Code § 65852.27, added by Stats. 2023, ch. 759, amended by Stats. 2024, ch. 7 (SB 477) (§ 65852.27(a)(5)) lets any California local agency admit into its own program plans “A local agency may also admit the following accessory dwelling unit plans into the program: (A) Plans that have been developed and preapproved by the local agency. (B) Plans that have been preapproved by other agencies within the state.” A city or county without a preapproval program of its own can post City of Los Altos’s plans as part of its own program instead of designing new ones — see the full statewide catalog for more options.

We build and maintain the program page, the plan library and the required third-party submission path for agencies that want to stand this up: $1,950 setup + $3,600/year (year one all-in $5,550).

Get started — $1,950 setup Questions? Email [email protected]

Data from Civic Data Works’ AB 1332 compliance scan. If City of Los Altos’s plans have moved or you find an error, write to [email protected] and we will correct this page. Back to the full catalog.