The Poly-B Replacement Process, Step by Step
If you've decided (or you're almost decided) to replace your Poly-B pipe, the biggest remaining question is usually "what is this actually going to be like to live through?" Here's the honest, day-by-day answer — from your first quote to the final walkthrough — so there are no surprises once the crew shows up.
The Short Answer First
A typical single-family Poly-B replacement in Calgary runs from a few days to about a week, depending on the size of the home and how many fixtures need new lines. Your contractor works through the house one zone at a time — usually the basement and main mechanical areas first, then upstairs bathrooms and kitchen — so you're never without water for more than a few hours on any given day. The job includes a free on-site assessment, a permitted install, a pressure test on every line, drywall patched to paint-ready, and a final walkthrough with documentation you'll want later for insurance or resale. Below is the detailed breakdown of what actually happens at each stage.
The Full Process, Stage by Stage
-
Free On-Site Assessment & Written Quote
Before anything is scheduled, a plumber walks your home to see how the Poly-B is routed — behind walls, through the ceiling, in the basement joists — and checks fixture count, water heater and furnace access, and any spots that look like prior leaks or repairs (see our warning signs guide if you're not sure what to look for). You'll get a written quote covering the material choice (we install PEX — compare it to the alternatives on our Poly-B vs PEX vs copper page), the estimated timeline, how much drywall access will be needed, and confirmation that a permit is included. Nothing should start until you've seen this in writing.
-
Permit Application
For a full repipe, your contractor should pull the required City of Calgary plumbing permit before any pipe comes out. This isn't red tape for its own sake — a permitted, inspected job is what gives you a paper trail proving the work was done to code. That paper trail is exactly what an insurance adjuster or a home buyer's lawyer will ask to see later, so it's worth the short wait it adds to the schedule up front.
-
Prep Day: Protecting Your Home
On day one, the crew lays down floor runners and drop cloths through the work path and sets up dust barriers around the areas being opened up. Before the crew arrives, it helps to clear a clean path to your water heater and furnace room, empty out from under sinks in bathrooms and the kitchen, and move anything fragile or sentimental away from the walls being worked on. A little prep here means less handling of your belongings once the real work starts.
-
The Repipe: Zone by Zone
Rather than shutting off water to the whole house for the entire job, most Calgary repipes are worked one zone at a time — basement and main mechanical lines first, then up through the main floor, then the upper floor and bathrooms. Water in that day's zone gets shut off while new PEX lines are run, then turned back on by end of day so you're not stuck without water overnight. Expect some small, targeted access cuts in drywall or ceiling near existing fixtures — this is normal and unavoidable with a repipe, and it's exactly what gets patched back up later.
-
Pressure Test & Inspection
Before any wall gets closed back up, every new line is pressure-tested to confirm there are no leaks at the fittings or joints. Where your permit requires it, a City inspector signs off on the rough-in before the drywall goes back — this is the step that actually protects you if a hidden leak ever became a dispute with an insurer down the road.
-
Drywall Patch & Clean-Up
Once everything's tested and signed off, the access cuts get patched, taped, mudded, and sanded to a paint-ready finish. Colour-matched painting itself is usually something you arrange separately afterward, unless your contractor specifically offers it as an add-on — worth asking about at the quote stage if you'd rather have it bundled in. The crew does a broom-clean sweep of the work areas before they leave for the day and again at the end of the job.
-
Final Walkthrough & Documentation
The last step is a walkthrough with your plumber to confirm every fixture has full pressure and there are no lingering issues. You'll receive your permit sign-off, final invoice, and any warranty paperwork — hang onto these. They're useful when you file an insurance claim, and they're the kind of documentation buyers and their lawyers ask for when you eventually sell the home, and they can affect your home insurance premiums going forward too.
How to Prepare Before Crew Arrives
Clear Access Areas
Empty out from under sinks and clear a path to the water heater, furnace, and main shut-off so the crew can get straight to work instead of moving your things first.
Plan for Pets & Kids
Cutting and drilling is noisy and dusty for stretches of the day. If you can arrange for pets or young kids to be elsewhere during work hours, it makes for a calmer day for everyone.
Expect Short Water Outages
Plan around a few hours without water in whatever zone is being worked that day — fill a jug for coffee or dishes and you won't be caught off guard.
Decide on Your Paint Plan
Patches come back paint-ready, not painted. Have your touch-up colour on hand, or ask your contractor upfront if painting can be bundled into the job.
Confirm the Permit
Ask to see confirmation the City permit has been pulled before work begins — it's a quick check that protects you later.
Keep the Quote Handy
Have your written quote on hand during the job so you can confirm scope, material, and timeline match what was agreed to.
Why This Process Matters
- Zone-by-zone scheduling: you keep water access most of each day instead of losing it for the whole job.
- A pulled permit: gives you documented proof of code-compliant work that protects your insurance coverage and resale value.
- Pressure testing before closing walls: catches leaks while they're still easy to fix, not after drywall is back up.
- Paint-ready patching and clean-up: means you're not left with a construction site to deal with after the plumbers leave.
- Final documentation: gives you paperwork you can hand straight to an insurer, a buyer, or a future contractor without digging for it.
Frequently Asked Questions
Do I need to be home the whole time?
You should be around (or reachable) at the start and end of each day so the crew can walk you through progress and confirm water is back on, but you don't need to watch over the whole job. Plenty of clients work from another room or head out for part of the day.
What happens to my basement stuff and furniture?
The crew protects floors and moves or covers items right in the work zone, but it's on you to clear small items from under sinks and around the water heater or furnace beforehand so nothing's in the way or at risk.
Is a permit really necessary?
For a full repipe, yes — your contractor should be pulling a City of Calgary plumbing permit. It's a small delay upfront in exchange for an official record that the work meets code, which matters a lot if you ever make an insurance claim or sell the house.
How many days will my water actually be off?
Only a few hours at a time, in whichever zone is being worked that day — not the whole house for the whole job. Most crews get full water service restored by the end of each work day.
Will I need to repaint after the drywall patching?
Usually, yes. Patches are finished smooth and paint-ready, but the actual painting is typically a separate step you arrange yourself unless your contractor offers it as part of the job — worth asking about when you get your quote.
Ready to See What It Would Look Like at Your Place?
Book a free on-site assessment and we'll walk your home, explain the zones we'd work in, and give you a written quote and timeline before anything is scheduled.
Get Your Free Quote