ADU · Orange
Attached ADU, Orange
An attached ADU in Orange that reads as a seamless extension of the main house — shared wall, independent entrance, and a full kitchen and bath inside a footprint that preserved the backyard.
Project record
550
sq ft
approx.
- City
- Orange, CA
- Builder
- Avorino · Lic. #1107538
- Typical budget
- $200K–$350K+ (attached ADU)
- Typical timeline
- 5–8+ months build, after design + permits
- Warranty
- 1-yr fit & finish · 4-yr systems · 10-yr structural
- Layout
- approx. 1 bed · 1 bath
- Stories
- Single-story
- Build
- Attached
Sizes and room counts marked approx. are estimates from plans and photos.
Scope of work
What this build involved.
- Attached ADU sharing one wall with the main residence
- Independent entrance + address-ready separation
- Full kitchen and bath
- Sound-isolation detailing at the shared wall
- Roofline + exterior finish matched to the main house
Permits & process
Orange applies design review in its historic quarters (Old Towne runs a dedicated review board), but standard residential lots follow the regular plan-check path. Matching the existing structure's exterior kept review friction low.
The build
Attached units trim the site-work bill — one shared wall, shorter utility runs — which is why they anchor the value end of the full-size ADU range.
Plates
Finish + structural detail.
13 finished frames
During construction
Slab to framing.
During construction — from our Instagram story
Slab rebar over the sand pad inside the forms First wall framing and header beam on the new slab Wall framing and roof rafters against the sky Sheathed wall with the framed window opening Framed hallway with double headers and ceiling joists
Next step
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