adu-construction

Q: Can Gencon handle both the ADU construction and interior finishing?

Yes. Gencon is a full-service ADU contractor. We handle everything from site prep and framing through interior finishing — flooring, cabinetry, bathroom fixtures, and paint. You get a turn-key unit, not a shell you have to finish yourself.

Custom ADU construction featuring quality exterior windows and elevated craftsmanship by Gencon, Clackamas County

Additional Dwelling Unit Contractors Near You — Clackamas County

More Than an ADU Build.
A Long-Term Investment.

Gencon is a family-owned additional dwelling unit construction company serving homeowners throughout Clackamas County. Founded by brothers Max, Alex, and Oleg, we bring hands-on craftsmanship and large-project management expertise to every accessory dwelling unit we build — from compact in-law suites to fully detached backyard cottages. If you've been searching for local ADU builders who deliver both design excellence and honest pricing, you've found them.

Our approach is design-first by nature. Your ADU should feel like a natural extension of your property — thoughtfully sited, beautifully finished, and built to the same standard as the main home. Whether you're building for rental income, multigenerational living, or long-term property value, Gencon delivers a turn-key unit you can be proud of.

20+

Years Master Craftsmanship

Brothers, One Vision

100%

Turn-Key Builds

For Your Estimate

Why Homeowners Build ADUs

The Smartest Investment on Your Property

+26%

Property Value Increase

ADUs consistently add significant resale value to Oregon properties, far outpacing the cost of construction in most Clackamas County markets.

$1,500+

Monthly Rental Income

Clackamas County's rental market means a well-built ADU can generate substantial monthly income — often paying back construction costs within a decade.

HB 2001

Oregon ADU Law

Oregon's landmark legislation dramatically expanded ADU rights for homeowners. Clackamas County has implemented these changes — meaning more properties qualify now than ever before.

100%

Turn-Key Delivery

Gencon handles every phase — design, permits, build, and finish — so your ADU is move-in ready on day one, not a half-finished shell requiring additional contractors.

What We Build

ADU Construction Services
Tailored to Your Property

From ADU contractors handling a garage conversion to full custom detached builds — Gencon covers every ADU type with expert precision throughout Clackamas County.

Detached ADU Construction

A fully separate structure on your property — the gold standard for rental income and privacy. Gencon builds detached accessory dwelling units from foundation through final finish, sited and designed to complement your existing home.

Attached ADU Builder

Connected to your main home but with its own entrance, kitchen, and living space — attached ADUs are an efficient way to add rentable square footage to your property without the complexity of a full detached build.

Garage Conversion ADU

Transform an underused garage into a fully permitted, livable accessory dwelling unit. Gencon handles insulation, drywall, plumbing, electrical, and full interior finishing — turning a storage space into a revenue-generating rental unit.

In-Law Suite Construction

Purpose-built for multigenerational living — our in-law suite contractor services create comfortable, accessible spaces for aging parents or family members who want independence without the distance. Thoughtfully designed to integrate with your home.

Backyard Cottage Builder

A custom backyard cottage built from the ground up — designed to feel like a real home, not an afterthought. Gencon builds backyard ADUs with the same design-forward thinking and master craftsmanship we bring to every project.

Junior ADU (JADU) Conversion

Convert a bedroom, basement area, or attached space into a fully permitted Junior ADU — a code-compliant dwelling unit within the existing footprint of your home. Ideal for properties with limited lot space or budget flexibility.

Our Work

Custom ADU Builds Near You

Every ADU Gencon builds reflects the property, the homeowner, and the vision. These are completed projects by our ADU builders throughout Clackamas County.

Completed ADU construction project by Gencon — quality craftsmanship throughout Clackamas County, Oregon

Interior finish work in a Gencon ADU build — design-forward craftsmanship, Clackamas County

Custom ADU exterior and detail work by Gencon — accessory dwelling unit construction near you

How It Works

Our ADU Construction
Contractor Process

We've built a clear, five-step process so your ADU build in Clackamas County runs smoothly — on time, on budget, and code-compliant from day one.

Free Property Consultation

One of the Gencon brothers visits your property, assesses your lot and existing structures, discusses ADU type options, and provides a clear, honest estimate — no pressure, no obligation.

Design & Space Planning

We develop a design plan for your ADU — layout, exterior finish, interior materials, and utility connections. Everything is locked in before construction begins so there are no surprises mid-build.

Permits & Approvals

Alex, our project manager, handles all permit applications and coordinates directly with Clackamas County building officials. Proper permitting protects your investment and ensures your ADU is legally rentable.

Site Prep & Foundation

For detached ADUs, we prepare the site, pour the foundation, and establish utility rough-ins — plumbing, electrical, HVAC — before framing begins. Every phase is inspected before the next begins.

Build, Finish & Walkthrough

Max leads the complete build through framing, MEP systems, insulation, drywall, and all finish work. We don't hand over keys until every detail meets our standard — and yours.

Why Gencon

Among the Best ADU
Builders Near You

Gencon was built by three brothers who believe quality and honesty should never be negotiated. As experienced ADU contractors serving all of Clackamas County, we earn trust through our work — not our marketing.

20+ Years of Master Craftsmanship Max founded Gencon after running multiple successful construction companies, including Honest Quality Construction. His depth of experience sets the bar for every ADU we build.
Large-Scale Project Management Alex managed large multifamily projects across the US at Redwood Construction. That systematic expertise ensures your ADU build is coordinated, compliant, and on schedule.
Design-First, Every Time We're a design-heavy construction company. Your ADU should look intentional, not like an afterthought. Thoughtful design planning before construction begins is what separates our work from the competition.
One Contractor, Start to Finish Gencon handles design, permitting, site prep, build, and full interior finish. You have a single point of contact from consultation through move-in — no finger-pointing between subcontractors.
Medium-High End Value — Maximum ROI We deliver premium-quality ADU construction at a price point that makes financial sense. The goal is a unit that commands top rental rates and holds its value for decades — not a budget build that needs repairs in five years.

The Gencon brothers — Max, Alex, and Oleg — family-owned ADU contractors in Clackamas County, Oregon

Common Questions

ADU Construction FAQ

Can I build an ADU on my property in Clackamas County?

Most residential properties in Clackamas County can accommodate at least one ADU under Oregon's HB 2001 and local zoning codes. Whether you have a detached lot, an attached garage, or interior space to convert, Gencon will assess your specific property and walk you through what's buildable. Call 503-825-0123 for a free, no-obligation property consultation.

What types of ADUs does Gencon build?

Gencon builds detached ADUs (backyard cottages), attached ADUs, garage conversion ADUs, in-law suites, and Junior ADUs (JADUs). We handle the complete build from design through final finish — one contractor, one point of contact, no subcontracted project management or finger-pointing when issues arise.

How long does ADU construction take in Clackamas County?

A garage conversion ADU typically takes 3–5 months from permit approval to move-in. A new detached ADU build generally runs 6–10 months depending on design complexity, site conditions, and material selections. Our project manager Alex coordinates every trade phase to keep your timeline as tight as possible.

Can an ADU be used as a rental unit in Oregon?

Yes. ADUs are legally rentable in Oregon, and many Clackamas County homeowners build them specifically to generate long-term rental income. Gencon builds every ADU to full residential building code so your unit is move-in ready for tenants from day one — with no grey areas around habitability or permitting.

Do I need a general contractor to build an ADU?

Building an ADU requires permits, licensed subcontractors for plumbing and electrical, and careful coordination across multiple trade phases. Hiring a general contractor like Gencon ensures code compliance throughout, proper permit management, and quality oversight from foundation to finish — protecting your investment for the long term.

Does Gencon handle interior finishing for ADUs as well?

Absolutely. Gencon is a full-service ADU builder. We handle everything from site prep and structural framing through interior finishing — flooring, cabinetry, bathroom fixtures, kitchen, paint, and trim. You receive a fully finished, move-in-ready unit, not a structural shell that requires additional contractors to complete.

What makes Gencon the right ADU builder near me in Clackamas County?

Gencon is a family-owned ADU construction company built by three brothers with complementary expertise: Max brings 20+ years of master craftsmanship, Alex brings large-scale project management from Redwood Construction, and our design-first process ensures your ADU is both beautiful and built to last. We serve all of Clackamas County with honest, transparent pricing and no middlemen.

Ready to Build?

Get a Free ADU Construction Estimate

We serve homeowners throughout Clackamas County. Our ADU builders near you are ready to visit your property, assess your options, and give you a clear, honest quote — with no obligation.

503-825-0123

Request a Free Estimate Email Us

Mon–Fri 8am–5pm · Clackamas, OR · [email protected]

More Than an ADU Build. A Long-Term Investment.