ADU Builder Serving Alvadore, OR
ADU Builder — built by Eugene’s garage & ADU master craftsman, serving Alvadore since 1969.
Thinking about an ADU in Alvadore? A backyard ADU adds rental income, room for family, and lasting property value — and Red Umbrella has been building garages, ADUs, and additions across Lane County since 1969. Alvadore lies just north of Fern Ridge Reservoir on flat Willamette Valley farmland; the area has seen quiet growth as Eugene professionals buy small farms here, and new detached garages on these parcels frequently include finished living space above — structurally a good fit given the single-story main houses and level grading.
Building an ADU in Alvadore
Alvadore sits 10 mi northwest of Eugene near Fern Ridge Reservoir. Is surrounded by working farmland where efu zoning and generous setbacks shape what — and where — you can build. Building permits here go through Lane 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, Alvadore is known for Fern Ridge Reservoir north shore and the Royal Avenue rural corridor, and we tailor every build to fit the lot, the neighborhood, and how you actually live.
ADU Builder in Alvadore: 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 Alvadore 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 Lane County and make the whole path simple.
Alvadore ADU questions
Will an ADU increase my property taxes in Oregon?
In Oregon, adding an ADU triggers a reassessment only on the value added, not on the entire property, so your existing home’s assessed value is unaffected. The new ADU square footage is added to your tax roll, typically increasing property taxes by a few hundred dollars per year — far less than the rental income most Alvadore ADUs generate. Your Lane County Assessor can provide an estimate once construction is complete.
Does Red Umbrella handle all the inspections during construction?
Yes — Red Umbrella schedules and manages every required municipal inspection, including foundation, framing, rough electrical, rough plumbing, insulation, and final inspection. The homeowner does not need to coordinate with City or county inspectors; Red Umbrella handles all communication and corrects any inspection comments before re-inspecting. You receive a copy of all final inspection approvals.
Does building an ADU or addition increase my home’s value?
Adding an ADU or a well-designed addition generally increases a home’s resale value in the Alvadore market, though the increase depends on location, finishes, and buyer demand. An ADU that generates rental income is especially appealing to buyers who can offset their mortgage with rent. Red Umbrella builds to quality standards that hold up over time and support strong appraisals.
We also build these in Alvadore.

Garage Conversion
A garage conversion is the fastest, most affordable way to add finished living space.
Learn more →
Custom Garage
A custom garage means covered parking, a real workshop, RV storage, or an apartment above.
Learn more →
Home Additions
A seamless addition adds the room you need without the cost and upheaval of moving.
Learn more →ADUs near Alvadore
We build throughout Lane County — here are nearby towns we also serve:
Trusted across the valley.
"Bari built us a fine, 600 sq ft cottage (ADU) in our back yard. Helpful from start to finish through the permit process."
"Our garage was crushed by a tree in the ice storm. Red Umbrella, garage specialists, were perfect for the job."
"Bari at Red Umbrella is a solid contractor! We hired him to remodel our garage in College Hill, and it became a special place to live and enjoy."
Planning an ADU in Alvadore?
Bari will look at your lot and give you an honest number — permits handled, up to 120% financing, usually a reply within one business day.
Get My Free Estimate → Call (541) 515-3843