Interior of a new ADU in Portland with vaulted ceiling, skylights and loft railing
ADUs & additions

Add a home
to your home.

A detached ADU in the back yard. An attached one off the house. A finished basement. Permitted, built and finished.

One-bedroom ADU, Portland
What it actually takes

Twenty trades.
One conversation.

Drawings, a permit, a foundation, framing, a roof, plumbing, electrical, HVAC, insulation, sheetrock, tile, cabinets, floors, doors, paint. Handled one at a time, that is twenty phone calls and a lot of waiting. With a general contractor it is one point of contact who lines up every trade, in order. One conversation.

An ADU means dealing with the city: building codes, permits, inspections, and knowing what happens when. That part is ours. If the job needs an architect or an engineer, we say so, and we work with yours.

Foundation to door hardware.How we build an ADU

Built to belong to the house.

Trim profiles, siding, roof pitch and windows chosen to match the main house, so the new building reads as though it was always there. Inside, vaulted ceilings, a loft and skylights make a one-bedroom feel bigger than its footprint.

One-bedroom ADU built by Kenton Woodwork in Portland, Oregon, exterior
One-bedroom ADU · Portland

Got a back yard and a question? Tell us the address and the idea.

Framing for a new apartment in a Portland basement

Or go down
instead of out.

Finished basements and additions. Plumbing, egress, insulation, framing. The same permits, the same care.

New apartment in a basement
Straight answers

Questions.

Do you do free estimates?

It depends on the project. The first meet-up is always free. If it's a larger project (over $20k) with a lot of elements, we use a pre-construction contract to cover the time spent exploring your options properly.

Do I need an architect, engineer or designer?

Are you getting the project permitted? We recommend doing things the right way rather than taking shortcuts, and larger projects often require these professionals. Outside of custom woodwork we don't do CAD or design work, but we're glad to work alongside your designer or architect.

Where do you work?

We're based in North Portland, Oregon, and work across the Portland metro. We're also licensed in Washington (L&I KENTOWL766Q1) for projects in Clark County.

Our house was built before 1978. Does that change anything?

Houses from before 1978 can have lead-based paint under the newer coats. The federal rule (the EPA's Renovation, Repair and Painting rule) says anyone paid to disturb painted surfaces in those homes has to be certified, and in Oregon that is a licence from the CCB. Kenton Woodwork holds the Lead-Based Paint Renovation licence (CCB 230699), so the dusty parts of the job are contained, cleaned up and done the way the rule says. You can check it on the CCB's lead-safe contractor search.