ADU Plumbing (Accessory Dwelling Units)
Plumbing for detached and attached ADUs, garage conversions and backyard cottages across Southwest Washington.
- Family-owned since 1999
- Licensed in WA & OR
- Plan-to-final coordination
- 4.5 on Google · 50 reviews
Service request
Start a project conversation.
Project type, location and your contact details. We follow up for plans and timing.
Office hours: Mon-Fri 7:00 AM - 4:00 PM
From the field
New-construction work from the field.
Our own crew, our own jobs and our own yard in Vancouver. No stock photos.
Oct 2026
Fitting the faucet on a freestanding tub before it goes in place.
From the archive
A completed new-construction home.
From the archive
Two vans parked at a framed house on a new-construction job.
The project
Plumbing shaped around this kind of build.
ADUs are small but technical, and the big decisions happen before the walls go up: tie into the house or run new laterals, and where the compact kitchen, bath and water heater go.
Scope priorities
What this work requires.
Tie-in or new laterals
We assess the existing water and sewer service and build whichever option fits.
Compact rough-in
Kitchen and bath rough-ins laid out for a small footprint.
Space-saving equipment
Tankless water heaters and compact equipment that give the square footage back.
Garage and basement conversions
Full plumbing, drainage and venting added to converted spaces.
Why All County
A plumbing contractor that works inside the build sequence.
01
Licensed in WA and OR
WA License: ALLCOCP795PK. OR CCB: 147151.
02
Schedule coordination
Plumbing phases planned around site access and the builder calendar.
03
Inspection milestones
Rough-in, trim, testing and final inspection, in that order.
04
Local since 1999
A Vancouver-based, family-owned contractor working across Southwest Washington.
Project request
Give us enough to review the fit.
Project type, location, plans and schedule. This longer form lets us review the details before we follow up.
Get a detailed quote for your construction project
ADUs plumbing questions
Should my ADU tie into the existing service or get its own?
It depends on the existing service capacity, the distance and your jurisdiction. We look at both and recommend the option that meets code at the lower cost.
Can you plumb a garage or basement conversion?
Yes. Full kitchen and bath plumbing, including drainage, venting and any ejector system the layout needs.
Do you help with ADU permits and inspections?
Yes. We build to current WA and OR code and coordinate the plumbing permit and inspections.
Other project types