Bathtub Installation Cost in Canada: Tub, Surround, Plumbing

A full bathroom remodel that includes a new tub typically costs $20,000 (range $15,600 – $26,000) before GST/HST, based on a 5 m² room. A tub-only swap is a slice of that, and the extras around the tub decide where in the range you land.

Our remodel figures cover the whole room, so a tub swap alone will come in well below them. Here is how we break down the job, and where the surprises hide.

How we calculate a tub install

We build the price from labour hours × local rates, plus materials, then check it against market prices and real quotes. For a standard tub the job has five parts:

• Demolition and disposal: removing the old tub, which is heavy and often cast iron or steel.
• The tub itself: acrylic, fibreglass, steel, cast iron or a freestanding model.
• Surround or tile: the walls around the tub.
• Plumbing: drain, overflow, faucet and valve connections.
• Making good: drywall, tile, paint and floor repair around the opening.

Tub-for-tub swap vs a changed layout

A like-for-like swap in the same 60-inch alcove is the cheapest route. The drain and supply lines stay where they are, and the new tub drops into the same footprint.

Costs climb when you change something:

• A different length or depth. The drain position rarely lines up, so the floor may need opening.
• Moving the drain or supply lines. This means cutting into the floor or wall, then repairing both.
• Swapping a tub for a larger soaker or freestanding model. Floor framing, a new drain position and extra finishing all add up.

If the room is being redone anyway, compare the tub swap with the whole job. See our Bathroom remodel guide for full-room pricing.

Surround: the choice that surprises people

The surround is where many quotes diverge. A one-piece acrylic or fibreglass surround is quick to fit and has few joints to leak. Tile looks better and lasts, but it needs a waterproofing membrane, more labour days and a cure time before the tub can be used.

If your old tub sat against tile, expect the tile to be damaged when the tub comes out. Quotes that say "tub only" often assume the surround survives. Ask what happens to the wall when it does not.

For tile, the floor and wall material matters as well. Our Flooring installation guide covers what a porcelain or vinyl floor adds if the bathroom floor is being replaced at the same time. A typical mid-range mix of flooring costs $4,500 for the default 25 m² area; a bathroom is much smaller, so scale accordingly.

Plumbing extras

Plumbing work needs licensed trades and usually a permit, so make sure your quote says who pulls it. Common extras include:

• Corroded or seized drain and overflow. Old galvanized or brass fittings often fail when disturbed.
• Replacing the shut-off valves or the mixing valve. Worth doing while the wall is open.
• Rough-in changes. Moving the drain or supply lines adds both plumbing and finishing time.
• Access panel. If there is no access behind the tub, a plumber may need to cut one in an adjacent wall or ceiling below.

Hidden costs to ask about

• Rot or mould behind the old surround. You only find this after demolition.
• Floor or subfloor repair. Heavy cast iron tubs are sometimes set in mortar or over damaged boards.
• Getting a heavy tub through the house. Narrow stairs and tight turns add labour.
• Painting and trim. Often excluded from "installation" quotes.
• GST/HST. Our figures are before tax. HST is 13% in Ontario and GST is 5% in Alberta.

When a tub swap makes more sense as a remodel

If the tub is the only thing worth keeping out of a tired bathroom, the case for a bigger project grows. Opening walls for plumbing, new waterproofing and new tile is the same labour whether you do one wall or three. Our Walk-in tub guide is worth a look if getting in and out of a standard tub is the real problem, and our Walk-in shower guide covers the alternative of removing the tub altogether.

Checking your quote

Before you sign, ask each contractor to list demolition, the tub, the surround, plumbing, permit and wall repair as separate lines. Then run the total through our "is my quote fair" tool. A low number that leaves out the wall repair or the permit is rarely cheaper in the end.