ADU design
1-bedroom ADU floor plans: sizes and layouts
By the HyreADU research desk. Last checked .
The short answer
1-bedroom ADU floor plans in California agency plan sets run from about 455 to 672 square feet.
Los Angeles’s city-owned YOU-ADU is a 455 sq ft 1-bedroom; Fresno and Anaheim each offer 499 sq ft plans; Sacramento’s Shelf Ready 1-bedroom is 559; Santa Cruz County’s is 637 and Santa Barbara County’s 672. All sit under the 750 sq ft impact-fee line.
| Agency | 1-bedroom plan | Note from the agency page |
|---|---|---|
| City of Los Angeles | YOU-ADU, 455 sq ft, 1-story | City-owned and free |
| City of Fresno | Plan 2, 499 sq ft | Free; 3 elevations |
| City of Anaheim | Plan 002, 499 sq ft, 1-bath | Free; no changes on Express |
| City of Sacramento | 559 habitable sq ft | Shelf Ready |
| County of Santa Cruz | 637 sq ft plus porch | Unincorporated county |
| County of Placer | 661 sq ft | Unincorporated county |
| County of Santa Barbara | 672 sq ft | Unincorporated county |
Layouts that work
A good 1-bedroom puts the front door into the living and kitchen area, with the bedroom and bathroom behind. The bedroom door should not open straight onto the kitchen. A closet between the bedroom and living room helps with sound.
Under 500 square feet
Plans at 499 square feet are common for a reason in California: under 500 square feet of interior livable space, an ADU is treated as not adding 500 square feet of assessable space for school fees (Gov. Code § 66311.5(c)(3)). See 500 sq ft ADU plans.
Who a 1-bedroom suits
A 1-bedroom suits a couple, a parent, or a tenant who wants a closed bedroom. Compare it on studio vs 1-bedroom and the 2-bedroom plans.
A mistake to avoid
The mistake to avoid is a bedroom with no room for furniture. Check that a bed, two side tables and a closet fit with clear walking space, and that the emergency escape window is not behind the headboard.
What to do next: check your lot with the ADU feasibility checker, read the questions to ask an ADU builder, then tell us about your project. Matching is not live yet, so we reply with information, not a quote.
Get ADU optionsQuestions
What is the smallest 1-bedroom ADU?
The agency plans above start at 455 sq ft. Codes set minimum room sizes rather than a unit minimum.
Is the LA YOU-ADU plan free?
LADBS lists YOU-ADU as city-owned and free. You still need a site plan and permit.
Can I add a porch?
Several county plans include one. Porches can count toward lot coverage.
Does a 1-bedroom ADU need parking?
In California at most one space, and often none under state exemptions.
Sources
- LADBS, ADU Standard Plan Program. Checked September 5, 2026.
- City of Fresno, ADU and Small Homes Program. Checked September 5, 2026.
- City of Anaheim, Pre-Approved Plan Catalogue. Checked September 5, 2026.
- City of Sacramento, Preapproved ADUs and Shelf Ready ADU Plans. Checked September 5, 2026.
- County of Santa Cruz, Pre-Designed ADU Plans. Checked September 5, 2026.
- County of Santa Barbara, Pre-Approved ADU Building Plans. Checked September 5, 2026.
- Gov. Code § 66311.5 (ADU impact fees, connection fees and capacity charges). Checked September 5, 2026.
- HyreADU research: pre-approved ADU plans in California. Checked September 5, 2026.
HyreADU is a publisher. It does not design, permit or build ADUs, has no partner builders, and gives no legal, tax, lending or engineering advice.
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