ADU Builder Serving Corvallis, OR

Thinking about an ADU in Corvallis? A backyard ADU adds rental income, room for family, and lasting property value — and Red Umbrella has been building garages, ADUs, and additions across Benton County since 1969. Corvallis ADU demand runs high because of OSU’s off-campus housing crunch — the city’s permitting office processes more ADU applications than most Oregon cities its size, and we know the workflow.

Building an ADU in Corvallis

Corvallis sits 47 mi north of Eugene via I-5 & OR-34. Sits on the Willamette Valley floor with established neighborhoods and city-run permitting, so a project moves on a predictable timeline. Building permits here go through City of Corvallis — a process we know well — and for an ADU, that shapes how utilities connect and whether a detached cottage or an attached unit fits best.

Locally, Corvallis is known for Oregon State University campus, Willamette River, Mary’s River, strong bicycle culture, and we tailor every build to fit the lot, the neighborhood, and how you actually live.

ADU Builder in Corvallis: what we build

We build detached backyard cottages, attached units, and ADUs above or beside a garage — designed, permitted, and built end to end.

• Detached & attached ADUs, 400–900+ sq ft
• Garage-to-ADU conversions (our specialty)
• Permits, utilities & site work handled
• Up to 120% financing — cash-flows as a rental

Why Corvallis homeowners choose Red Umbrella

• Garages and ADUs under one roof — the rare shop that masters both, so a garage-with-a-suite is one project, one crew.
• Master Electrician in-house — owner Bari Swartz wires it himself, to code, no waiting on a sub.
• Building since 1969 — you work directly with Bari, not a sales rep or a rotating cast of subs.
• Permits handled & up to 120% financing — we know City of Corvallis and make the whole path simple.

Corvallis ADU questions