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Bathroom Renovations

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Update or fully redo a bathroom, ensuite or powder room. Tell us about your bathroom renovation project and we’ll help you find local bathroom renovation contractors who serve your area.

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A bathroom renovation packs a lot of trades into a small room. In a few square metres you have water supply and drains, electrical circuits close to water, ventilation, waterproofing, tile, glass, cabinetry and lighting, and every one of them has to be done in the right order. That density is why bathrooms are among the most demanding renovations for their size, and why the work you never see matters more than the finishes you pick.

Homeowners renovate bathrooms to replace worn or dated fixtures, to repair water damage, to swap a tub for a walk-in shower, to add a second bathroom or to make the room safer as they get older. In a Canadian home, a bathroom also has to cope with winter: humid air that isn't exhausted outdoors ends up as condensation on cold windows and exterior walls, and eventually as mould.

A well-planned renovation starts with the layout and the condition of what's behind the walls and under the floor, then moves through demolition, rough-in, waterproofing and finishing, with accessibility and ventilation planned before the first wall comes down.

Bathroom refresh, tub-to-shower conversion or full remodel: scope and timeline

A refresh keeps the fixtures where they are and replaces surfaces and fittings: a new vanity, toilet, faucet, lighting, paint and perhaps flooring. A tub-to-shower conversion or a new shower means opening walls, adjusting the drain and rebuilding the waterproofing. A full remodel strips the room to the studs and subfloor, often moves fixtures and may change the size of the room. The further you go down that list, the more trades, inspections, drying and curing time the project needs.

  • Custom items such as a vanity, a glass shower enclosure or a stone countertop are usually measured after the tile is in and can take time to make.
  • Hidden damage, such as rotten subfloor around the toilet or tub, has to be repaired before anything new goes in.
  • Membranes, mortar, levelling compounds and grout need their full drying or curing time, which can't be rushed without risking failure.
  • If it is the only bathroom in the house, the work may need to be staged so a toilet stays usable, which stretches the schedule.

Bathroom renovation process, from demolition to finishing

  • Protection and demolition: the water is shut off, the rest of the house is protected from dust, and fixtures, tile and drywall come out, down to the studs and subfloor where needed.
  • Structural check: the crew looks for rot, soft subfloor, mould and damaged joists, and repairs them before going further.
  • Plumbing and electrical rough-in: licensed trades adjust the supply lines, drains and vents, add circuits for lighting, a heated floor or the fan, and blocking goes into the walls for grab bars and accessories.
  • Ventilation: an exhaust fan is installed with a duct that runs all the way outdoors, not into the attic, a wall cavity or the space between joists.
  • Backer and waterproofing: cement board or another tile backer goes up in wet areas, followed by a continuous waterproof membrane on the shower walls and floor, carefully sealed at seams, corners, niches and pipe openings.
  • Tile and fixtures: tile is set and grouted, then the vanity, toilet, shower valve trim, glass and accessories are installed.
  • Final connections and inspection: the plumber and electrician make their final connections, the work is inspected where the permit requires it, and every drain, fixture and seal is checked for leaks.

Waterproofing behind tile and building a curbless shower

Tile and grout are not waterproof. Water gets through grout lines and hairline cracks every time the shower runs, so what keeps the walls and floor dry is the layer behind the tile. In a shower, that means a moisture-resistant backer such as cement board, covered by a waterproof membrane, either a sheet product or a liquid-applied coating, that runs continuously from the drain up the walls, with every seam, corner, niche and valve opening sealed. Many installers flood-test the shower floor before any tile goes down.

A curbless shower is popular for both its looks and its accessibility, but it asks more of the floor. The shower area has to slope to the drain while the rest of the bathroom floor stays level, which often means recessing the subfloor between the joists or using a linear drain along one wall. On a wood-framed floor, lowering or notching joists is structural work: have the contractor confirm how it will be done, and by whom, before you settle on the design.

Accessible bathroom and aging-in-place ideas

A renovation is the easiest moment to make a bathroom simpler to use later, because the walls are already open. Solid blocking behind the drywall around the toilet, tub and shower lets you add grab bars whenever they're needed, and a curbless shower with a handheld showerhead and a seat works for someone using a walker or wheelchair as well as for young children. CMHC's list of accessibility modifications also includes slip-resistant flooring or a slip-resistant coating on tile, a shallow sink usable standing or seated, D-shaped handles on cabinets and drawers, a raised toilet seat, and grab bars and a safety mat in the tub.

  • Wall blocking for grab bars beside the toilet and in the tub or shower, even if the bars come later.
  • A curbless shower with a handheld showerhead on a slide bar and a built-in or fold-down seat.
  • Lever faucets and D-shaped cabinet handles that are easy to use with weak or sore hands.
  • A wider doorway with a door that swings out or slides, so someone who falls inside can still be reached.
  • Good, even lighting with switches at the entrance, plus a night light for trips to the bathroom.
  • A sink that can be used standing or seated, with open space below if a wheelchair user needs it.

Permits for bathroom plumbing and electrical changes

Replacing a vanity, a toilet or tile in the same place often doesn't need a permit, but many municipalities require one as soon as you move or add fixtures, run new drains or vents, alter the structure or add a bathroom. Check with your municipality before demolition, because inspections have to happen while the walls are still open.

Plumbing and electrical work in a bathroom belongs with licensed trades. In Quebec, plumbing contractors are qualified by the Corporation des maîtres mécaniciens en tuyauterie du Québec (CMMTQ) and electrical contractors by the Corporation des maîtres électriciens du Québec (CMEQ), and the renovation contractor needs an RBQ licence with the right subclasses. The electrician will make sure the outlets, lighting, heated floor and fan meet the electrical code's requirements for rooms with water.

Bathroom exhaust fans and moisture control that protect your renovation

Every shower releases a lot of moisture into a small room. An exhaust fan ducted to the outdoors removes it before it can condense on cold surfaces, peel paint, stain the ceiling and feed mould. A fan that dumps air into the attic simply moves the problem to a place where you won't see it until the roof sheathing is damaged. Ask for a quiet fan sized for the room, with a short, sealed and insulated duct to an exterior hood with a damper.

Once the room is finished, use it: run the fan during every shower and for a while afterwards, or choose a model with a humidity sensor or timer so it runs on its own. Keep an eye on the caulking where the tub or shower meets the walls and floor, and redo it as soon as it cracks or pulls away.

Common bathroom renovation mistakes to avoid

  • Tiling over regular drywall or an old, cracked wall in a shower instead of installing a proper backer and membrane.
  • Venting the exhaust fan into the attic, or skipping the fan because the room has a window.
  • Choosing fixtures after the rough-in, so the valve, drain or wall-hung toilet carrier ends up in the wrong spot.
  • Forgetting blocking for grab bars, towel bars and a heavy vanity or mirror while the walls are open.
  • Leaving no access panel for the tub or shower valve where one is needed.
  • Starting demolition in an older home without first having the plaster, old floor tiles or joint compound tested for asbestos.

Bathroom Renovations: frequently asked questions

What is the first step in a bathroom renovation?

Decide what has to change and what can stay where it is. Keeping the toilet, tub or shower and sink in their current locations simplifies the plumbing a great deal. Then have a contractor look at the condition of the floor and walls, the ventilation and the electrical supply before you choose finishes, so the design fits the room you actually have.

Is a curbless shower a good idea?

It is easy to step into, looks open and works well as you age, but it needs careful planning: the floor has to slope to the drain, the waterproofing must extend beyond the shower area, and on a wood floor the subfloor often has to be recessed. Ask the contractor how they will handle the slope and the structure before you commit.

Does my bathroom fan have to vent outside?

Yes. The whole point of the fan is to get moist air out of the house. A fan that blows into the attic or a wall can cause condensation, mould and rot where you can't see it. A contractor can run a sealed, insulated duct to a wall or roof outlet.

How can we manage while our only bathroom is being renovated?

Ask the contractor to plan the sequence so the toilet stays in service as long as possible or is reinstalled temporarily at night, and to group the steps when the water has to be off. Some families shower at a gym or with relatives while the shower is being waterproofed and tiled; arranging that ahead of time makes the project much less stressful.

Sources

  1. CMHC: Low- and no-cost modifications for accessibility
  2. RBQ: Plumbing licence
  3. CMMTQ: Qualification mandate
  4. RBQ: Electrical work, licence
  5. CMEQ: Licence required
  6. Health Canada: Asbestos and your health

Written by the LokalMatch editorial team. Last reviewed September 10, 2026.

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What affects the cost of bathroom renovation

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Size of the bathroom and whether the layout changes
  • Moving the toilet, shower or drains
  • Tile, fixtures and vanity chosen
  • Walk-in shower, tub or both
  • Water damage or rot found during demolition
  • Ventilation and electrical upgrades

How to compare bathroom renovation contractors before you hire

  • Choose a contractor who can explain how they'll waterproof the shower or tub area, not only what tile they'll use.
  • Ask to see bathrooms they've finished, ideally some that have been in use for a while.
  • Make sure plumbing and electrical work will be done by licensed trades.
  • Get a written quote that lists fixtures, tile, ventilation and who supplies each item.
  • Ask how long the bathroom will be out of use, especially if it's the only one.

Questions to ask bathroom renovation contractors before you hire

  • How will you waterproof the shower, tub and floor?
  • Will you replace or upgrade the exhaust fan so moisture is vented outside?
  • Who supplies the fixtures and tile, and what happens if something is back-ordered?
  • Will plumbing need to move, and does the work need a permit?
  • What will you do if you find rot or mould behind the walls?
  • What warranty do you offer on your workmanship?

When to call a pro for bathroom renovation

  • Soft or spongy floors around the toilet or tub
  • Loose tiles or cracked grout in the shower
  • Mould that keeps coming back or musty smells, which should be assessed by a qualified professional

Bathroom renovation permits and local rules

Some bathroom renovation work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

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