ADU design and drafting in Bend and Deschutes County.
Preedin Design designs and drafts accessory dwelling units (ADUs), including detached cottages, above-garage units, and conversions, for properties in Bend and across Deschutes County. In the City of Bend an ADU can be up to 800 square feet, and a lot with a single-unit home can have up to two ADUs. Rural ADUs in unincorporated Deschutes County follow separate county rules, including a 900-square-foot limit on usable floor area.
What's included
- Feasibility review of your lot's zoning
- ADU floor plan and exterior design
- 3D renderings of the unit on your site
- Permit-ready construction drawings
- Coordination with utilities and your engineer
ADU rules in Bend
The City of Bend allows ADUs on residential lots that have a single-unit home, townhome, or manufactured home. A lot can have up to two ADUs; the first can be up to 800 square feet and a second up to 500 square feet. Detached ADUs generally need at least six feet of separation from other dwellings on the lot. Neighborhood CC&Rs can be stricter than city code, so we check those too.
Rural ADUs in Deschutes County
Since late 2023, Deschutes County has allowed rural ADUs in certain rural residential zones. Eligible properties generally need at least two acres, the ADU must be within 100 feet of the main house, and usable floor area is capped at 900 square feet. Unincorporated communities such as Tumalo, Terrebonne, and Sunriver fall outside the rural ADU program, so the right approach depends on exactly where your lot sits.
Designing a small home well
A good ADU feels bigger than its square footage: tall ceilings where they count, built-in storage, windows placed for light and privacy, and a layout that works for a renter, a relative, or a guest. We design the unit to belong with the main house and the neighborhood.
Related projects
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Common questions
How big can an ADU be in Bend, Oregon?
In the City of Bend a single ADU can be up to 800 square feet. If a lot has two ADUs, the second is limited to 500 square feet. Always confirm current limits with the City of Bend before designing.
Can I build an ADU on rural land in Deschutes County?
Possibly. Deschutes County allows rural ADUs in certain rural residential zones on eligible lots, generally two acres or more, with a 900-square-foot usable floor area cap and a location within 100 feet of the main house. Unincorporated communities such as Tumalo and Sunriver are not eligible under that program.
Do you design garage conversions and above-garage ADUs?
Yes. We design detached ADUs, units above garages, and conversions of existing space, and draft the permit set for each.
ADU Design across Central Oregon
Sisters
Our home base. Custom homes, shops, and additions in and around Sisters.
Bend
Custom homes, infill, ADUs, and west-side projects including Tetherow.
Redmond & Tumalo
Acreage homes, shops, and infill across Redmond, Tumalo, and Powell Butte.
Black Butte Ranch
Custom homes and remodels prepared for ARC review, including Rock Ridge.
Sunriver
Resort homes and cabin remodels prepared for SROA Design Committee review.
Official sources and resources
Codes and local rules change. Confirm current requirements with the reviewing agency before you build.
Ready to start your project?
Every inquiry gets a reply within two business days with a scope, a fee, and an honest read on fit.