Civic Data Works · Plans catalog · County of Riverside

County of Riverside — preapproved ADU plans

County of Riverside ( County) posts 4 preapproved accessory dwelling unit plans on its own website, verified 2026-08-07.

Agency: County of Riverside
County
Plans posted: 4
Verified: 2026-08-07

What’s posted

Riverside County TLMA Building & Safety 'Permit Ready ADU' program hosts four free, downloadable, code-compliant architectural plan sets (499-909 sf) directly on the county's own building.rctlma.org domain.

Sources: https://building.rctlma.org/permit-ready-adu, https://building.rctlma.org/sites/g/files/aldnop406/files/2026-05/PRADU%20Plan%201_499_sf_V2.pdf

Direct WebFetch of building.rctlma.org returned 403 (bot-blocked); content retrieved via r.jina.ai proxy, which returned the program page text plus 4 explicit plan PDF links (Traditional/Craftsman/Spanish styles). Second independent check: a direct WebFetch attempt on one plan PDF exceeded the 10MB tool size limit, consistent with a genuine large multi-sheet architectural PDF rather than a broken or placeholder link.

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