ADU design
Studio ADU floor plans: small layouts that work
By the HyreADU research desk. Last checked .
The short answer
Studio ADU floor plans in California agency plan sets run from 224 to about 480 square feet.
Anaheim’s Plan 001 is 224 sq ft, Fresno’s 340, Sacramento’s Shelf Ready studio 367, Santa Cruz County’s 425, Burbank’s city plan 432 and Santa Barbara County’s about 480.
A studio puts sleeping, living and cooking in one room with a separate bathroom.
| Agency | Studio plan | Note from the agency page |
|---|---|---|
| City of Anaheim | Plan 001, 224 sq ft | Free |
| City of Fresno | Plan 1, 340 sq ft | Free |
| City of Sacramento | 367 habitable sq ft | Shelf Ready |
| County of Santa Cruz | 425 sq ft, optional 1-bed version | Unincorporated county |
| City of Burbank | 432 sq ft, 1-story | Garage conversions excluded |
| City of Torrance | 440 sq ft (VL Architects) | About 80% complete for permitting, per the city |
| County of Santa Barbara | About 480 sq ft | Unincorporated county |
Zoning one room
A studio works when the room has zones: a sleeping area away from the door, a living area by the main window, and a kitchen on one wall. A half-height wall, shelving or a change in flooring marks the zones without closing them off.
What the law allows
California bars cities from setting minimum sizes that would prohibit an efficiency unit (Gov. Code § 66321(b)(1)), so a small studio is a legal ADU. Building codes still set room minimums and require an emergency escape opening where people sleep.
Who a studio suits
A studio suits one person: a student, a single tenant or a parent who wants simple living. A small studio may also qualify for a garage conversion of one car. Compare on studio vs 1-bedroom and ADU vs tiny home.
A mistake to avoid
The mistake to avoid is a studio with no storage. With one room, every item is on view. Plan a full-height closet, storage under the bed and cabinets above the kitchen from the first drawing.
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 small can a studio ADU be?
Agency plans above start at 224 sq ft. The building code sets minimum room sizes.
Does a studio need an egress window?
Where the room is used for sleeping, the code requires an emergency escape opening.
Can a studio be a JADU?
A JADU is a California category of 500 sq ft or less inside the house. A detached studio is a full ADU.
Are studio plans free?
Some cities, such as Anaheim and Fresno, offer free plans. Others are bought from designers.
Sources
- City of Anaheim, Pre-Approved Plan Catalogue. Checked September 5, 2026.
- City of Fresno, ADU and Small Homes Program. 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 § 66321 (size and height standards a city may not impose). Checked September 5, 2026.
- International Residential Code 2021 (R305 ceiling height, R310 emergency escape). 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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