Bathroom Renovation Plumbing: A Calgary Planning Guide
Where the rough-in decisions get made, what your builder needs from a plumber, and how to avoid opening the same wall twice.
Short answer: Bathroom plumbing decisions get made at rough-in, before the walls close, not when the fixtures arrive. Settle the layout, choose the actual tub, shower valve, toilet and vanity, and get the spec sheets to your plumber before rough-in. Keeping fixtures where they are costs least. Moving drains is what swings the budget.
Get the rough-in right and the finish goes smoothly. Get it wrong and you are opening the same wall twice. Here is what to decide, and when.
What gets decided at rough-in?
| Fixture | What the plumber needs | Why it matters early |
|---|---|---|
| Shower valve and system | The exact valve, body sprays and rain head, and the finished wall depth | Valves have specific rough-in depths. Wrong depth means trim that will not fit |
| Freestanding tub | The tub model and a floor-mounted filler | The drain and filler are placed to the inch in the floor |
| Toilet | Floor-mount or wall-hung, and its rough-in distance | Wall-hung toilets need a carrier in the wall |
| Vanity and sinks | Vanity height, sink type and faucet | Sets the drain and supply heights |
| Curbless or linear-drain shower | The drain type and floor slope plan | The floor structure may need changes before anything else happens |
What drives the cost?
- Whether fixtures move. Keeping everything in place is far cheaper than relocating drains and supply lines, especially across joists or over a finished ceiling.
- Fixture choice. Thermostatic systems, body sprays, freestanding fillers and wall-hung toilets all add rough-in work.
- What is behind the wall. Old Poly-B, undersized drains or a stack in the way change the scope. If the house was built from the late 1970s to the late 1990s, here is how to check for Poly-B.
Because fixture selection swings the number so much, a good plumber quotes from your actual drawings and spec sheets rather than a flat guess.
Who does what on a bathroom renovation?
The plumber handles drains, venting, supply lines, the shower valve, fixture connections and the permit. Waterproofing, tile and the structure of a curbless shower are done by your builder or tile trade. The plumber sets the drain and valve so those trades can finish around them. Clear lines between trades are what keep the job on schedule.
Do you need a permit?
If you are moving or adding plumbing, yes. In Calgary, a plumbing permit is required when a plumbing system is built, extended or altered. Replacing existing faucets and fixtures in the same spot does not need one.
The order it happens in
- Layout and fixtures chosen, spec sheets to the plumber
- Demolition
- Plumbing rough-in, plus any framing changes
- Inspection
- Waterproofing, drywall and tile
- Fixtures set, trim installed and tested
Worth adding while the walls are open
- In-floor heat under the tile
- Access panels for the shower valve and any jetted tub pump
- New shut-off valves at every fixture
- Replacing any Poly-B in the walls you have open
Common questions
Can I move my toilet during a bathroom renovation?
Usually, but it is one of the bigger cost swings, because the drain is large and has to slope correctly. Moving it a short distance in the same direction as the joists is easiest.
When should I choose my fixtures?
Before rough-in. The plumber needs the actual valve, tub and toilet specs to place everything correctly.
How long does bathroom plumbing take?
Rough-in is usually a few days, depending on how much moves. The finish connections come after tile and are quicker.
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