ADU design
2-bedroom ADU floor plans: sizes, layouts and the fee line
By the HyreADU research desk. Last checked .
The short answer
2-bedroom ADU floor plans in California agency plan sets range from about 746 to 998 square feet.
Sacramento’s Shelf Ready 2-bedroom is 747 sq ft and Placer County lists 746 and 749, both under the 750 sq ft line above which impact fees may apply.
Santa Clara County’s is 800, Anaheim’s 990 with two baths, and Santa Cruz County’s 998.
| Agency | 2-bedroom plan | Note from the agency page |
|---|---|---|
| City of Sacramento | 747 habitable sq ft | Shelf Ready; confirm code cycle |
| County of Placer | 746 sq ft; 749 sq ft with optional garage | Unincorporated county |
| County of Santa Clara | 800 sq ft, 2-bed/1-bath | Free for unincorporated residents |
| County of Sacramento | 870 sq ft (Redwood) | Unincorporated county |
| County of Santa Barbara | 909 sq ft | Unincorporated county |
| City of Anaheim | 990 sq ft, 2-bed/2-bath | No changes on the Express track |
| County of Santa Cruz | 998 sq ft, 2-bed/1-bath | Updating to the 2025 code |
Layouts that work for two bedrooms
The strongest 2-bedroom layouts put the bedrooms at opposite ends with the living area between, so two adults sharing get privacy. A plan with one bathroom saves space; a second bath suits housemates. Each bedroom needs its own emergency escape window.
The 750 square foot line
In California, an ADU of 750 square feet or less of interior livable space pays no impact fees; above that, fees must be proportional to the main house (Gov. Code § 66311.5). A city cannot cap a 2-bedroom ADU below 1,000 square feet (§ 66321(b)(2)). Check your city’s numbers with the ADU fee calculator.
Will two bedrooms fit your lot?
Two bedrooms need a larger footprint or a second story. Run your setbacks and coverage through the size envelope calculator, then compare one-story vs two-story.
A mistake to avoid
The mistake to avoid is adding a second bedroom without checking parking.
In California, where parking is required, it is capped at one space per unit or per bedroom, whichever is less, so a second bedroom does not raise it above one space.
State exemptions remove it entirely in some cases, including garage conversions. Ask your city which applies.
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
How big is a 2-bedroom ADU?
Agency plans above run from 746 to 998 sq ft. Yours depends on your lot and city cap.
Can a 2-bedroom ADU be under 750 sq ft?
Yes; Sacramento’s and Placer County’s are.
Do 2-bedroom ADUs need two bathrooms?
No. Most agency plans above have one.
Can I use a county plan inside a city?
Usually not; county plans cover unincorporated areas. Ask your city.
Sources
- City of Sacramento, Preapproved ADUs and Shelf Ready ADU Plans. Checked September 5, 2026.
- County of Sacramento, Shelf Ready ADU Program. Checked September 5, 2026.
- County of Santa Barbara, Pre-Approved ADU Building Plans. Checked September 5, 2026.
- County of Santa Cruz, Pre-Designed ADU Plans. Checked September 5, 2026.
- City of Anaheim, Pre-Approved Plan Catalogue. Checked September 5, 2026.
- Gov. Code § 66311.5 (ADU impact fees, connection fees and capacity charges). Checked September 5, 2026.
- Gov. Code § 66321 (size and height standards a city may not impose). Checked September 5, 2026.
- Gov. Code § 66314 (ADU standards: parking, setbacks, sprinklers). 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.
Rules vary by state and city; California rules are labeled as such. Spotted an error? Tell us through our corrections page. Licensed professionals can also contribute as named sources.