How much does an ADU cost in Portland?

Portland-area ADUs typically run $200,000 to $400,000 depending on size, finishes, and site conditions. JOCS gives clear, fixed quotes after a free site visit.

How long does it take to build an ADU?

Most ADUs in Portland take 5-8 months from permit issuance to move-in. Bigger units or harder sites take a bit longer.

Can I build an ADU on my Portland lot?

Most Portland and Gresham lots allow ADUs. JOCS does a free feasibility check before you commit to design or plans.

ADU Builder Portland & Gresham OR | New Home Construction

Why ADUs

Add Space. Add Value. Add Income.

An ADU (Accessory Dwelling Unit) is one of the smartest moves a Portland homeowner can make. Use it for family. Rent it out. Live in it and rent your main home.

Portland and Gresham both allow ADUs. Build rules are friendly. We know the process.

Detached ADUs — backyard cottages
Attached ADUs — additions to your home
Garage conversions to ADUs
Basement ADUs with their own entrance
600 to 1,200 sq ft — most popular sizes
Built to code, with all permits pulled

Custom detached ADU build with covered porch and cedar fence — JOCS Construction Portland

Also Available

Full New Home Builds.

Custom New Homes

Building from scratch on your lot? We do single-family homes too. Real craft, start to finish.

Foundation through framing
Plumbing, electrical, HVAC
Insulation, drywall, paint
Cabinets, counters, floors
Final landscaping and grading

Built the JOCS Way

One crew. One number to call. Weekly updates. Real prices. No surprises.

Free site visit and feasibility check
Fixed quote — in writing
Permit pull and inspection management
Trusted local subs we've worked with for years
Warranty on every job

How It Works

Four Steps to a New Build.

1

Site Check

We look at your lot. Check zoning, setbacks, and what's possible. No charge.

2

Plans & Permits

Work with our architects or bring your own. We handle the city paperwork.

3

We Build

Foundation. Framing. Finish. Weekly updates the whole way.

4

Move-In Day

Final walk-through. We fix what's off. Keys in your hand. Done.

Common Questions

ADU & New Build Questions.

How long does an ADU take to build?

Most ADUs in the Portland area take 5–8 months from permit to move-in. Bigger units or tricky lots can take a bit longer.

How long does a full new home take?

Most new homes take 10–14 months from permit to move-in. Size, complexity, and city review times all matter.

Can I build an ADU on my lot?

Most Portland and Gresham lots allow ADUs. We'll do a free feasibility check before you commit to plans.

How much does an ADU cost?

Portland-area ADUs typically run $200,000 to $400,000 depending on size and finishes. We give a clear, fixed quote — not a guess.

Do you work with construction lenders?

We don't lend, but we work with construction-to-perm lenders across Oregon. Happy to connect you.

ADUs & New Homes — Built from the Ground Up.