Accessory dwelling units
Junior, attached and detached accessory dwelling units — designed, permitted and built by one accountable team.
Junior, attached and detached, compared side by side — the size rules, where each sits, and how plans connect to price.
Carved out of the existing house, inside its current walls.
Shares at least one wall with the main house.
A standalone structure in the yard.
Lot, zoning and setback check before any drawing work begins.
Plans drawn to clear plan check, not only to look good.
Submittal, corrections and city liaison handled by us.
Construction and project management to final inspection.
41 sec Timber framing and a drone pass over a two-storey detached ADU under construction.
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.
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.
Our smallest size band — a detached or attached unit around 400 sq ft. Pick a size to see how it moves.
Project size (sq ft)
ADUs run 100–1,200 sq ft. The smallest band is priced on a representative project of about 400 sq ft.
Our fee
$5,750
Drawings, structural, Title 24 and permit coordination — a fixed scope we quote up front.
Construction
$152,000–$200,000
The one that really moves — finish level, site conditions and access. Only meaningful once we have seen your lot.
ADUs run 100–1,200 sq ft. The smallest band is priced on a representative project of about 400 sq ft.
$12,775
Drawings, structural, Title 24 and permit coordination — a fixed scope we quote up front.
$262,500–$352,500
The one that really moves — finish level, site conditions and access. Only meaningful once we have seen your lot.
ADUs run 100–1,200 sq ft. The smallest band is priced on a representative project of about 400 sq ft.
$16,800
Drawings, structural, Title 24 and permit coordination — a fixed scope we quote up front.
$379,500–$517,500
The one that really moves — finish level, site conditions and access. Only meaningful once we have seen your lot.
Estimates for planning, not a quote. Your feasibility report replaces every number here with figures for your actual property — and the consultation that starts it is free.
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.