Plumbing Rough In Services in the Niagara Region



Licensed, code-compliant plumbing rough in services for bathrooms, kitchens, laundry rooms, and basement suites—done right the first time by local, licensed & insured plumbers.

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Plumber in St. Catharines performing a rough-in installation, securing new drain and vent pipes in a basement ceiling.

What We Rough In (and Why It Matters)

A proper rough-in sets accurate locations, slopes, and support for everything that comes later. We handle:

  • Drain & vent piping (ABS/Cast Iron/PVC) with correct sizing and slope for reliable flow
  • Water supply lines (PEX/copper) with shut-offs placed where you’ll actually need them
  • Toilet, shower, tub & vanity stubs set to finish heights for a clean final look
  • Laundry boxes & floor drains with trap primers where required
  • Backwater & clean out access for future maintenance (smart insurance against backups)
  • Pressure & leak testing + inspection coordination
Plumber in St. Catharines standing beside a newly completed bathroom vanity and faucet after plumbing rough-in and installation.

Common Rough-In Projects We Do

We trust in a tailored approach regardless of your location:

  • Drain & Vent Piping: ABS, PVC, or cast iron used with proper slope and support
  • Water Supply Lines: PEX or copper with strategically placed shutoffs
  • Fixture Stubs: Toilet, tub, vanity, shower drains at finish-ready heights
  • Laundry, Utility Sinks & Floor Drains: Includes trap primers and backwater valves where needed
  • Clean-Outs & Backflow Prevention: For easier future service and compliance
  • Pressure Testing & Inspection Coordination: Peace of mind that it’s done right
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  • Richard helped put in a new kitchen for us in our basement. Reasonable pricing and a smooth operator. He was great.
    Kelly, I.
    Secord Woods, St Catharines
  • We used Flow State for roughing in a new double vanity in our ‘big’ bathroom. We’re happy our friend gave us their number.
    Laura, W.
    Downtown, Welland
  • Excellent and fairly priced work on our washroom. Nice guys too. We’ll recommend them to friends and family in the future.
    Ava J.
    Lundy’s Lane, Niagara Falls

Why Homeowners & GC’s Choose Flow State:

Code-compliant, inspection-ready work across the Niagara Region specific to each city (St. Catharines, Niagara Falls, Welland and beyond)

Clean sites, clear communication, and accurate timelines

Fixture-ready layouts that make other trades like tilers and finish carpenters happy

Clear Coordination with homeowners or GC’s

Our Rough-In Process


Site Visit – We visit your Niagara Region home to the verify layout, fixture choices, joist directions, slab conditions, and tie-in points. You get a clear scope of work and written quote.

Permits & scheduling – If permits are needed, we’ll guide the process and book inspection windows that keep your project moving.

Install drains, vents & water lines – Precise elevations, slopes, and supports. We protect floors, dust-control the work area, and keep framing tidy for other trades that will come in afterwards.

Testing & inspection – We water test as required, then meet the inspector and handle any notes on the spot.

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Shower and toilet plumbing rough-in in Niagara Falls, showing PEX water lines, ABS drain, and framed wall with cement board partially installed.
Screenshot

Niagara Region Plumbing Rough In Service Areas

St. Catharines: Glenridge, Port Dalhousie, Merritton, Western Hill

Niagara Falls: Stamford, Lundy’s Lane, Chippawa, North End

Welland: Downtown, Cooks Mills, East Side

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Plumbing Rough In in Niagara Region FAQ

Below are some of the most common questions we’ve received from customers across St. Catharines, Niagara Falls and Welland regarding our plumbing rough in services.

If you’re adding, relocating, or significantly altering plumbing, a permit is typically required. We’ll advise and help coordinate inspections.

Most 3-piece basement bath rough-ins take 1–3 days depending on slab work, distances, and inspections.

Yes. We use a wet concrete saw neatly, excavate, place/compact back fill, and patch to a clean finish, ready for flooring.

It depends on the rough in job, the home owner’s or GC preferences but ABS/PVC for drains and PEX or copper for water lines, all to Ontario standards and manufacturer specs. This is St. Catharines plumbing guide for example.

Of course! We set accurate centres, heights, and clearances so vanities, tubs, and showers line up with tile and glass.

Yes, we work with many GC’s and have a great reputation for

Yes, our work is guaranteed. We’re happy to complete the final set & trim so one team owns the whole result.

Ready to Rough-In Your Niagara Region Project?

Contact us send your plans for a fast quote. We’ll handle the plumbing layout, testing, and inspections, so your project finishes cleanly.

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