Civic Data Works · Plans catalog · County of Santa Clara

County of Santa Clara — preapproved ADU plans

County of Santa Clara ( County) posts 2 preapproved accessory dwelling unit plans on its own website, verified 2026-08-05.

Agency: County of Santa Clara
County
Plans posted: 2
Verified: 2026-08-05

What’s posted

County Planning & Development's Pre-Approved ADU Program page describes a free 800 sq ft, 2BR/1BA plan available in Standard (Traditional) or Contemporary style for unincorporated county residents, and a direct plan PDF is hosted and linked.

Sources: https://plandev.santaclaracounty.gov/services/development-services/building/pre-approved-adu-program, https://stgenpln.blob.core.windows.net/document/SCC_Preapproved_ADU_Plans_800SF.pdf

The county's own PDF is the operative evidence. ADVERSARIALLY RE-VERIFIED 2026-08-05: independent re-fetch confirmed real, held posted.

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 County of Santa Clara’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 County of Santa Clara’s plans have moved or you find an error, write to [email protected] and we will correct this page. Back to the full catalog.