ADU Builder Serving Cottage Grove, OR
ADU Builder — built by Eugene’s garage & ADU master craftsman, serving Cottage Grove since 1969.
Thinking about an ADU in Cottage Grove? 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. Cottage Grove’s historic district design standards apply to façade work near Main Street, but residential garage and ADU additions on surrounding half-acre lots proceed under standard city permits with no historic overlay — good-sized yards leave room for true detached structures.
Building an ADU in Cottage Grove
Cottage Grove sits 20 mi south of Eugene on I-5. Has historic-character streets where design and materials matter, so a build has to fit the period without faking it. Building permits here go through City of Cottage Grove — 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, Cottage Grove is known for covered bridges of the Coast Fork Willamette and the Historic Main Street district, and we tailor every build to fit the lot, the neighborhood, and how you actually live.
ADU Builder in Cottage Grove: 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 Cottage Grove 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 Cottage Grove and make the whole path simple.
Cottage Grove ADU questions
Can I convert my garage into an ADU in Cottage Grove?
Yes — converting an attached or detached garage into a livable ADU is one of the most cost-effective ways to add a rental unit or guest suite in Cottage Grove. A garage-to-ADU conversion typically costs $50,000–$85,000 depending on the existing structure’s condition, desired finishes, and whether plumbing must be added. Red Umbrella specializes in garage conversions and handles permits, electrical, framing, insulation, and finish work under one contract.
What is the timeline from consultation to permit approval for an ADU in Cottage Grove?
After your free consultation and once Red Umbrella prepares drawings (typically 2–4 weeks), the permit application is submitted to City of Cottage Grove Development Services, where plan review takes approximately 6–16 weeks for residential projects depending on current workload. Total time from first call to permit-in-hand is usually 3–5 months. Red Umbrella tracks your application status and responds promptly to any reviewer comments to minimize delays.
How do ADU rental returns compare to the cost of construction in Cottage Grove?
Cottage Grove arean ADUs commonly rent for $1,200–$2,000 per month depending on size, location, and finishes, which can generate $14,000–$24,000 per year in gross rental income. At those rates, a $60,000 garage-conversion ADU can recoup its full cost within 3–5 years in rental income alone. Red Umbrella does not guarantee rental rates, but can connect you with local property managers who know the Cottage Grove market.
We also build these in Cottage Grove.
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 →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 Cottage Grove?
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