Corvallis Home Addition Builder

Thinking about a home addition in Corvallis? A seamless addition adds the room you need without the cost and upheaval of moving — 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 a home addition 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 a home addition, that shapes how the new space ties into existing rooflines, the foundation, and the permit path.

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.

Home Additions in Corvallis: what we build

We build room additions, primary suites, second stories, and bump-outs that match your home’s lines like they were always there.

• Room & multi-room additions
• Primary suites with spa baths
• Second stories, engineered & permitted
• Sunrooms, bump-outs & matched rooflines

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 home addition questions