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Add-On Plumbing • Mount Angel & the Willamette Valley
Home Addition, ADU & Shop Plumbing
Adding square footage — a primary suite, an ADU for family or rental income, a shop with a bathroom — means extending your home's plumbing the right way: properly sized supply, correctly sloped drains, venting that meets Oregon code, and permits that close cleanly.
Tannor handles the full sequence on additions: connecting to your existing system without starving pressure elsewhere, rough-in coordinated with framing and concrete, and finish work once surfaces are in.
What this covers
- Full plumbing for room additions and primary suites
- ADU and guest-house plumbing, permit-ready
- Shop and garage conversions — bathrooms, utility sinks, hose bibs
- Water and drain line extensions from the main house
- Water heater sizing for the added demand
- Rough-in and finish phases, inspection-ready
What to figure out before you build
- Where the new drains will tie in — and whether the existing main can handle it
- Whether your water heater can serve another bathroom, or needs upsizing
- Trenching and slab decisions happen early; plumbing layout should come first
- ADUs have their own code requirements — plan for them before the permit application
Why Mathias Plumbing
Licensed, Bonded & Insured — CCB #230155
Family owned and based in Mount Angel, serving Salem, Keizer, Silverton, Woodburn and the surrounding Willamette Valley. When you call, you get Tannor Mathias — the licensed plumber who answers the phone, gives you an upfront price, and does the work himself.
Questions
Frequently Asked
Can my existing water heater and main line handle an addition?
Sometimes. A load calculation tells the truth: fixture count, pipe sizing and pressure determine it. Tannor checks this up front so you budget for upsizing before construction, not during.
Do you handle the plumbing permits?
The work is done to Oregon code and inspection-ready. Permit logistics vary by project and city — discuss your situation with Tannor and he'll tell you exactly how it works for your build.
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