302 sq ft
From $190,500 at this size
Size-band figure — provisional, design + build, confirmed at feasibility.
1 bed · 1 bath
Footprint 15'-6" X 19'-6"
Living room, Kitchen, Bedroom, Bathroom
Attached ADU
Attached ADUs
Shares at least one wall with the main house — the move when the lot is tight but the structure can extend.
Attached ADU
How it compares to the other two.
Junior ADUCarved out inside the existing houseOpen
You’re hereAttached ADUShares at least one wall with the home
Detached ADUA standalone building in the yardOpenPlans that fit
What this looks like on paper.
A floor plan is not attached-only or detached-only — many layouts can be built either way, and which fits depends on your lot, not the drawing. A sample across our size range:
Rules that apply.
Limits vary by jurisdiction. These are the levers that decide what fits on your lot — we confirm every one of them against your city before design starts.
- Smallest a city may cap you at850 sq ft, or 1,000 sq ft with 2+ bedroomsGov. Code §66321
- Height a city must allow25 ft, or the local zoning limit — whichever is lowerGov. Code §66321
All the rules that apply, with citations
- KitchenFull and independent
- BathroomRequired
These are California state minimums — the floor every city has to allow. Your jurisdiction may permit more, and applies its own setbacks, height and design rules on top. We confirm all of it against your address before design starts. See regulations by city. Statutes reviewed 4 August 2026.
Is this you? When this is the right call
Your lot is too tight for a standalone structure.
You want a full independent unit, not a conversion.
You would rather extend the house than build separately.
Feasibility → design → permit → build — the same four steps as every project we run. See how the process works.
Start with a free consultation.
Under an hour, no pressure — we talk through what your lot allows and give you a ballpark for your property. No charge, and no obligation to go further.