ADU Plumbing (Accessory Dwelling Units)
Plumbing for detached and attached ADUs, garage conversions, and backyard cottages across the Portland-Vancouver metro.
ADUs are small but technical. The biggest decisions happen before the walls go up: tie into the existing home service or run new water and sewer laterals, fit a compact kitchen and bath efficiently, and choose space-saving equipment like tankless water heaters. We handle the rough-in, the equipment, and the permit and inspection coordination so your ADU comes online cleanly.
What Sets ADUs Plumbing Apart
Service Tie-In or New Laterals
We assess whether to tie into your existing water and sewer service or run new laterals, and execute either.
Compact, Efficient Rough-In
Kitchen and bath rough-ins laid out to make the most of a small footprint.
Tankless & Space-Saving Equipment
Tankless water heaters and compact equipment that free up square footage in the unit.
Garage & Basement Conversions
Adding full plumbing to garage and basement conversions, including drainage and venting.
Why Builders Choose All County
Licensed in WA & OR
Fully licensed, bonded, and insured in both states - one contractor across the metro.
Schedule You Can Trust
Crews sized to your build calendar so plumbing never holds up the next phase.
Code & Inspection Ready
Built to current code, with inspections scheduled, met, and documented.
Local Partner Since 1999
A family-owned crew that knows the local jurisdictions, inspectors, and suppliers.
Request a Bid
Tell us about your project and we will follow up within one business day with next steps and a quote.
Get a detailed quote for your construction project
ADUs Plumbing FAQs
Should my ADU tie into the existing service or get its own?
It depends on the existing service capacity, distance, and your local jurisdiction. We assess both and recommend the most cost-effective option that meets code.
Can you plumb a garage or basement conversion?
Yes. We add full kitchen and bath plumbing to garage and basement conversions, including the drainage, venting, and any required ejector systems.
Do you help with ADU permits and inspections?
Yes. We build to current WA and OR code and coordinate the plumbing permit and inspections so your ADU passes and powers on cleanly.
We Build For Every Kind of Project
Explore the other builder segments we serve across the Portland-Vancouver metro.