Shower Remodel Montreal: Plumbing Requirements and Cost Guide (2026)
Quick Answer
Shower remodeling in Montreal costs $2,500 – $12,000+ depending on scope. A basic shower replacement runs $2,500 – $6,000, a tub-to-shower conversion costs $6,000 – $12,000, and a custom walk-in shower with glass enclosure can reach $8,000 – $15,000+. The plumbing portion alone typically runs $1,500 – $5,000. Your bath plumber is the most critical trade in the project.
The #1 shower remodel mistake: choosing tile before confirming what the plumbing can support.
A shower remodeling project is one of the highest-impact upgrades you can make to a Montreal bathroom. Whether you are replacing a worn-out shower stall, converting an old bathtub into a modern walk-in shower, or building a custom tiled enclosure from scratch, the result transforms both the look and the daily experience of the space. Walk-in showers are now the most requested feature in Montreal bathroom renovations.
But here is what most homeowners underestimate: the plumbing layer underneath determines everything. The drain location, valve type, water pressure, venting, and waterproofing all need to be right before a single tile goes up. This guide focuses on the plumbing requirements and real costs your bath plumber needs to handle so you can plan a shower remodel that looks great, functions perfectly, and does not spring leaks two years later.
Types of Shower Remodels and What They Cost
Not all shower remodels are equal. Here is what each type involves and what Montreal homeowners pay in 2026:
Biggest Cost Driver: Moving the drain location. A shower drain in the same spot means simple plumbing. Moving it even 2 feet requires cutting the concrete floor, rerouting the drain line, and adding new venting. This single change can add $2,000 – $4,000 to the plumbing bill.
6 Plumbing Requirements for a Shower Remodel
Every shower remodeling project has plumbing requirements that must be met for the shower to function properly and pass code inspection. Here is what your bath plumber handles behind the scenes:
Shower Valve (Mixing Valve)
The valve controls water temperature and flow. Modern shower remodeling projects use pressure-balanced or thermostatic valves that prevent scalding if someone flushes a toilet elsewhere in the home. A pressure-balanced valve costs $150 – $400; a thermostatic valve costs $300 – $800. The valve body is installed during rough-in (before drywall and tile) and the trim kit goes on last.
Drain and P-Trap
A 2-inch drain line is standard for most showers. The P-trap holds water that blocks sewer gas from entering the home. For curbless (zero-threshold) walk-in showers, a linear drain is used instead. These require precise floor slope (minimum 2% grade toward the drain) and careful plumber coordination with the tile installer. Linear drains cost $200 – $600 more than standard centre drains.
Vent Stack
Every drain needs a vent to allow air into the drainage system. Without proper venting, your new shower will drain slowly and gurgle. In many older Montreal bathrooms, the vent is undersized or non-compliant with the current Quebec Construction Code. Adding or upgrading the vent costs $500 – $1,500. This work is invisible once finished but essential for proper function.
Supply Lines (Hot and Cold)
If your home has galvanised or old copper supply piping, this is the time to replace it with PEX. Modern PEX lines are flexible, resist freezing better (critical in Montreal), and do not corrode. Replacing supply lines in the shower wall costs $500 – $1,500. If you are planning a rain head or body jets, your plumber needs to verify that your water heater and main line can deliver adequate pressure and volume.
Waterproofing
This is the most commonly skipped requirement in budget renovations and the most costly to skip. Every tiled shower needs a continuous waterproof membrane (Kerdi, RedGard, or equivalent) on all wet-area surfaces before tile is installed. The membrane prevents moisture from reaching the wall structure and causing mould and rot. Waterproofing costs $800 – $2,000. Skipping it causes $5,000 – $15,000 in mould remediation within 3 to 5 years.
Shut-Off Valves
While the wall is open for shower remodeling, replace any old gate valves with quarter-turn ball valves. This ensures you can isolate the shower for future repairs without shutting off the entire home’s water supply. Cost: $100 – $250 per valve. It is also an ideal time to inspect the main shut-off valve.
Planning a Shower Remodel? Start with the Plumbing.
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Tub-to-Shower Conversion: Montreal’s Most Requested Remodel
Converting a bathtub to a walk-in shower is the most popular shower remodeling project in Montreal right now. Modern homeowners prefer showers for daily use, and walk-in designs add accessibility as you age in place. Here is what the conversion involves from a plumbing perspective:
Drain modification: A tub drain and shower drain are different sizes and positions. Your bath plumber removes the tub drain and P-trap, then installs a new 2-inch shower drain at the correct position and slope. Cost: $500 – $1,200.
Valve replacement: Old tub/shower combo valves are replaced with a dedicated shower valve (pressure-balanced or thermostatic). If you want multiple outlets (rain head plus hand shower), a diverter valve is added. Cost: $300 – $800 for valve plus installation.
Supply line upgrade: Tub spouts require half-inch supply lines; modern rain showerheads with body jets may need three-quarter-inch supply for adequate volume. Your plumber verifies water pressure and upsizes piping if necessary. Cost: $200 – $800.
Shower base or custom mud bed: Prefabricated acrylic bases ($200 – $800) are fastest. A custom mortar (mud) bed for tile ($400 – $1,200) allows more design flexibility, including curbless entries.
Waterproofing plus tile: The entire shower area (floor, walls, curb, and niche) must be waterproofed before tile is installed. This is where many budget renovations fail. A properly waterproofed and tiled shower enclosure costs $2,000 – $6,000 depending on tile selection.
Wondering about bathtub installation services instead? If you prefer keeping a tub (common for families with young children), a modern freestanding or alcove bathtub replacement costs $1,500 – $5,000 installed. Your bath plumber handles the drain connection, overflow, supply lines, and ensures the subfloor can support the tub’s weight when full. In Montreal’s older triplexes and duplexes, subfloor reinforcement is often needed for heavy freestanding tubs, so budget an extra $300 – $800 for structural support if your home was built before 1970.
Shower Plumbing Cost Breakdown (Montreal 2026)
Here is what the plumbing tasks actually cost, itemised so you can compare against your contractor quote:
Popular Shower Features and Their Plumbing Impact
Modern shower designs go well beyond a single showerhead. Each added feature has plumbing implications your bath plumber needs to plan for:
Rain Showerhead
Requires three-quarter-inch supply line for adequate flow (8 to 12 L/min). Ceiling mount needs in-wall piping routed up through the wall and across the ceiling.
Add: $200 – $600 plumbing
Hand Shower (Secondary)
Needs a diverter valve to switch between heads. Wall-mount slide bar is standard. Plumbing adds one extra outlet from the valve body.
Add: $150 – $400 plumbing
Body Jets
Each jet needs its own supply line. 4 to 6 jets is typical. Requires three-quarter-inch main supply and a thermostatic valve with volume control. Significant plumbing complexity.
Add: $800 – $2,000 plumbing
Curbless Entry
Requires recessing the shower floor below the bathroom floor level. The drain must be set lower and the entire floor sloped precisely. A linear drain is typical.
Add: $1,000 – $3,000 plumbing plus floor work
Why Shower Remodeling Requires a Licensed Bath Plumber
In Quebec, all plumbing work must be performed by a CMMTQ-licensed plumber. This is not just a bureaucratic requirement; it exists because shower plumbing involves pressurised water, drainage, gas venting, and waterproofing in an enclosed wet environment. The consequences of poor installation are severe and often hidden until damage is extensive.
Code compliance: The Regie du batiment du Quebec (RBQ) enforces the Quebec Construction Code for all plumbing installations. Your shower must pass inspection before walls are closed.
Waterproofing integrity: A licensed bath plumber coordinates with the tile installer to ensure the waterproof membrane is continuous around all pipe penetrations, the valve body, the drain flange, and any niches or benches. Gaps in waterproofing cause concealed mould that destroys the wall structure.
Anti-scald protection: Quebec code requires anti-scald (temperature-limiting) shower valves. Your plumber ensures the valve is properly set and tested to prevent scalding, which is especially important in homes with children or elderly residents.
Insurance and resale: Unpermitted plumbing work can void your home insurance and create major complications when selling. Professional installation with inspection documentation protects your investment and ensures full insurance coverage.
5 Ways to Save on Your Shower Remodel
Keep the drain in the same location: The single biggest savings. If the new shower drain lines up with the old drain, you avoid cutting concrete and rerouting the drain line, saving $1,500 – $4,000.
Choose a prefab base over custom mud bed: An acrylic shower base ($200 – $800) is faster to install and cheaper than a custom mortar bed ($400 – $1,200). You can still tile the walls for a high-end look while keeping the base simple.
Bundle plumbing upgrades: While walls are open, replace supply lines, shut-off valves, and address any leaking pipes elsewhere. You save significantly on future access costs. Consider updating your bathroom faucet at the same time.
Do not skip waterproofing: This sounds contradictory, but $800 – $2,000 on waterproofing now prevents $5,000 – $15,000 in mould remediation later. It is the single best ROI item in a shower remodel.
Have fixtures on-site before the plumber arrives: Having your shower valve, showerhead, and drain ready prevents return visits and schedule delays. Your plumber can confirm compatibility and install everything in one trip.
Shower Remodel FAQ
How much does a shower remodel cost in Montreal?
A basic shower replacement costs $2,500 – $6,000. Tub-to-shower conversion runs $6,000 – $12,000. A custom walk-in tiled shower costs $8,000 – $15,000+. The plumbing portion alone is typically $1,500 – $5,000 depending on scope.
How long does a shower remodel take?
A basic shower replacement takes 3 to 5 days. A tub-to-shower conversion takes 5 to 10 days. A full custom walk-in shower takes 7 to 14 days. Add 3 to 5 days if permits and inspections are required.
Do I need a permit for a shower remodel in Montreal?
If you are moving or adding plumbing fixtures, yes, a permit is required from your borough. A same-location shower replacement with no plumbing changes may not require a permit. Confirm with your borough office before starting work.
Is a tub-to-shower conversion worth it?
For most Montreal homeowners, yes. Walk-in showers are the most requested feature in bathroom renovations. They improve accessibility, use less water, and feel more spacious. The exception: if your home has only one bathroom and you have young children, keeping at least one bathtub is recommended for resale value.
What is the difference between a pressure-balanced and thermostatic shower valve?
A pressure-balanced valve ($150 – $400) adjusts water pressure to maintain temperature when other fixtures are used. A thermostatic valve ($300 – $800) maintains an exact set temperature regardless of pressure changes and allows independent volume control. Thermostatic valves are required for multi-outlet showers (rain head plus hand shower plus body jets).
Can I add a shower to my basement bathroom?
Yes, but it requires cutting the concrete floor for drain installation and possibly adding an ejector pump if the drain is below the main sewer line. Budget $5,000 – $10,000 for the plumbing portion of a basement shower. A sump or ejector pump may be required.
How do I find a bath plumber for shower remodeling near me in Montreal?
Look for a CMMTQ-licensed plumber who specialises in bathroom renovations. Verify their licence, ask for references from recent shower remodel projects, and get a detailed written quote that itemises plumbing tasks separately from tile and finishing work. Plumbing Montreal handles all shower plumbing including rough-in, valve installation, waterproofing coordination, and finish work.
What type of shower drain is best?
Standard centre drains ($50 – $150) work for most shower bases. Linear drains ($200 – $600) are required for curbless showers and create a modern look. Tile-insert linear drains ($300 – $500) are nearly invisible and create a seamless floor appearance. Your bath plumber recommends the drain type based on your shower design and floor construction.
Should I install a new bathtub or convert to a shower?
If your home has two or more bathrooms, converting one tub to a shower is a great investment. If you have only one bathroom, consider keeping the tub (or installing a tub and shower combo) for families and resale value. Bathtub installation services cost $1,500 – $5,000 for a standard replacement or $3,000 – $8,000 for a freestanding tub with new plumbing.
How often should a shower be remodeled?
A well-built, properly waterproofed shower lasts 15 to 25 years. Signs it is time for shower remodeling: cracked or missing grout, loose tiles, persistent mould that returns after cleaning, leaking through the floor below, musty smell, or outdated fixtures. Regular plumbing maintenance extends shower life significantly.
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Related Plumbing Services:
Shower Installation |
Bathtub Installation |
Bathroom Renovation |
Sink and Faucet |
Toilet Installation |
Drain Cleaning |
Plumbing Maintenance