Backyard ADUs in Alsea, Oregon

Thinking about an ADU in Alsea? 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. Alsea sits in one of Benton County’s most remote valleys, which means contractor lead times and material deliveries require planning a week or two further out than typical — we account for that upfront.

Building an ADU in Alsea

Alsea sits 47 mi northwest of Eugene via OR-34. Follows a river corridor, so floodplain mapping and riparian setbacks are real factors we plan around from day one. Building permits here go through Benton County — 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, Alsea is known for Alsea River (premier steelhead fishery), Hayden Covered Bridge, OR-34, Alsea Charter School K–12, and we tailor every build to fit the lot, the neighborhood, and how you actually live.

ADU Builder in Alsea: 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 Alsea 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 Benton County and make the whole path simple.

Alsean ADU questions