The Bathroom Renovation Checklist (Canada): Every Decision, In Order

Last updated: 11 June 2026 · By Mossy Tariq, Founder — Property Blueprint Co.

A bathroom is the highest-risk room in the house to renovate, and the one homeowners plan the least. It is small, so it feels simple — but it is a wet room with plumbing, electrical, and a waterproofing layer that has to be right the first time, packed into a few square metres where every trade depends on the one before it. The projects that go wrong almost never go wrong because of the trades. They go wrong because the decisions were made late, on site, out of order.

A checklist is what turns a wish list into a plan. A wish list is the bathroom you want. A checklist is every decision that has to be made, in the order it has to be made, so that no trade arrives to find the choice they need has not been settled — and so that the one layer you cannot inspect later, the waterproofing, is never rushed. This is that checklist, built for a Canadian bathroom renovation, in the order the decisions actually fall.

A wish list describes the bathroom you want. A checklist is every decision that gets you there — including the one layer you only get to do once.

Work through it in sequence and you arrive at the first contractor conversation already holding the answers most homeowners are still improvising halfway through the build. It is the planning layer beneath the twelve phases of a renovation, and it is what keeps the budget in what a bathroom renovation costs from drifting once the work starts.

Why a bathroom renovation needs a checklist, not a wish list

Because a bathroom is a dependency chain with a point of no return in the middle of it. A missed decision does not stay missed — it surfaces two trades later as a stall or a variation. The tiler needs the waterproofing signed off before starting. The plumber needs the layout before the rough-in. The vanity cannot be set before the floor is tiled. And the waterproofing, once it is under the tile, cannot be checked again without removing everything on top of it. Deciding late in a bathroom is more expensive than in any other room, because the room is small and the wet layer is unforgiving.

The checklist also protects the budget in a way a wish list never can. A defined bathroom can be priced once and held to a written scope; an undefined one is priced as a low quote and finished as a series of variations at construction rates. The homeowner who works the checklist before quoting is the one who can compare quotes honestly and refuse the changes that were never theirs to absorb — the pattern set out in the bathroom renovation mistakes that cost the most.

The planning and budget checklist

This is the work that happens before a single tile is chosen, and it is the work that decides whether the project is real. Complete every item here before moving to design.

• Define the scope tier. Decide honestly whether this is a cosmetic refresh, a full mid-range renovation, or a high-end rebuild with the layout moved, because the tier sets the number more than any single finish.
• Build the budget from the trades up. Estimate each line — vanity and fixtures, tiling and waterproofing, plumbing, electrical, ventilation, flooring, permits, and tax — rather than a single hoped-for total.
• Add GST or HST to the budget. Sales tax applies to renovation labour and materials, and the rate depends on your province; put it in the plan, not in the surprise pile.
• Set a contingency of 10 to 20 percent. In a bathroom the condition behind the walls — old plumbing, a rotted subfloor under a leaking shower, wiring that no longer meets code — is the one cost you cannot choose, and it is discovered at demolition.
• Decide whether the layout moves. Keeping the toilet, vanity, and shower where they are keeps the plumbing small; moving the toilet drain or relocating the shower is the decision that triggers significant plumbing and usually a permit.
• Confirm the household can run without the bathroom. Set a realistic timeline and a plan for the days the only bathroom is out of service before the start date, not after.

The design and selections checklist

Every selection here has to be final before quotes go out, because every trade downstream prices and builds against it. A selection changed after this point does not just cost the change — it costs every dependent stage that has to wait for it.

• Lock the layout and the fixture positions. Fix the position of the toilet, vanity, shower, and bath, and confirm whether any of them move, before anything else is chosen.
• Choose the shower type. A standard valve, a thermostatic valve, or a curbless wet-room shower each demand a different rough-in and a different waterproofing approach, so the choice is made before the plumber arrives.
• Select the vanity, toilet, tub, and tapware. The vanity and toilet set the drain and supply positions the rough-in has to hit; the tapware sets the valve type.
• Settle the tile, flooring, and waterproofing system. Tile format and the waterproofing membrane affect the substrate and the floor build-up, and a heated floor, if wanted, has to be planned into the layers now.
• Specify the ventilation and lighting. An exhaust fan vented to the outside and the lighting plan, including any fixtures in the shower zone rated for it, are part of the specification, not an afterthought.
• Document every selection in one specification. One written document, with model numbers and finishes, is what every contractor prices against so the quotes are comparable.

The trades, permits, and contract checklist

This is where the plan meets the people who will build it, and where a clear scope turns into a contract that protects you. Complete it before any work begins.

• Confirm what triggers a permit where you live. Building, plumbing, and electrical permits and the code itself vary by province — each adapts the National Building Code of Canada and the National Plumbing Code — so confirm with your municipal building department.
• Issue one written scope to every contractor. Hand each one the same specification so the quotes price the same bathroom and can be compared honestly.
• Verify licensing and insurance. Confirm the electrician and plumber are licensed for work to the Canadian Electrical Code and provincial plumbing code, and that the contractor carries liability insurance and provincial workers' compensation coverage.
• Confirm who waterproofs, and to what standard. Establish which trade applies the waterproofing membrane and that it will be done as a defined, inspectable step, not folded invisibly into the tiling.
• Read every quote for what is excluded. The lowest quote is usually the one that left the most out; price the gaps before you choose.
• Sign a contract with staged payments and a holdback. Progress payments released against completed, inspected work, a defined variation process, and the provincial construction lien holdback — often around 10 percent — confirmed for your province.

The build, waterproofing, and sign-off checklist

The planning is done; this is how you hold the line through construction so the project finishes where it was priced — and so the wet layer is right. These are the checks that happen on site, in order.

• Order the long-lead items first. The vanity, tub, shower enclosure, and tile are ordered the day the contract is signed, because their lead time sets the schedule.
• Verify the rough-in before it is closed. Confirm the plumbing and electrical positions match the plan while the walls are open, including a GFCI-protected circuit and the exhaust fan ducted to the outside under the Canadian Electrical Code and the building code.
• Hold the waterproofing as a sign-off step. The membrane is applied to the wet areas, allowed to cure, and inspected before any tiling begins — this is the hold point that protects the whole room.
• Confirm the scald-protection valve. A pressure-balanced or thermostatic valve limits the water temperature, with the National Plumbing Code setting a maximum of 49°C at the shower and tub to prevent scalding.
• Walk a defects list before final payment. Check the falls to the drain, silicone lines, tile lippage, the vanity and toilet sitting true, and the fan running clear, before releasing the final payment.
• Collect the paperwork at completion. Obtain the permit sign-offs, the electrical certificate, warranties, and manuals before the project closes.

The decisions that have to be locked, in order

If the full checklist is too much to hold at once, these are the decisions that everything else depends on, in the order each one has to be made. Settle these six and the rest of the bathroom falls into place around them.

1. The scope tier and the budget. Decide what kind of renovation this is and build the number from the trades up, with tax and contingency in it, before anything else.
2. The layout, and whether the plumbing moves. Fix the positions of the toilet, vanity, and shower, because this is what triggers the plumbing and the permit.
3. The shower and the waterproofing system. Choose the shower type and the waterproofing approach together, because they set the rough-in and the wet layer.
4. The fixtures, tile, and ventilation. Select the vanity, toilet, tub, tapware, tile, and exhaust fan, because they set the drains, the substrate, and the electrical.
5. The written scope and the contract. Document the bathroom, issue it to every contractor, and sign a contract with staged payments, a holdback, and a variation process.
6. The inspection and sign-off plan. Decide which inspections happen when — above all the waterproofing — and what is checked before final payment, before the first wall is opened.

That order is not arbitrary. Each decision unlocks the next and constrains the ones after it, which is why making them out of order is what produces the variation invoice — or the leak — two trades later. The checklist is the order, made visible before the project starts. The household renovating more than one room will recognise the same discipline in the kitchen renovation checklist, applied to the next room.

The 12-Phase System is built to put this checklist in the homeowner's hands before the project starts — every decision, in order, with the waterproofing hold point and the Canadian permit, code, and tax points that change by province built in. Phase awareness is what turns a homeowner from someone improvising decisions on site into someone who settled them at the planning desk, where they are cheap.

If the cost baseline is the right first step, use the free Renovation Cost Calculator — a trade-by-trade estimate for your specific bathroom, in under 5 minutes, before any contractor has quoted.

Frequently asked questions

What should be on a bathroom renovation checklist?

A complete bathroom renovation checklist runs in four stages: planning and budget, design and selections, trades and permits and contract, and build and sign-off. It covers the scope tier, a trade-by-trade budget with tax and contingency, the layout and whether the plumbing moves, the shower type and waterproofing system, the fixtures, tile, and ventilation, a written specification, comparable quotes, a staged contract with a holdback, the permits and inspections, and a defects list before final payment. Above all it treats the waterproofing as a defined, signed-off step.

What is the most important step in a bathroom renovation?

The waterproofing. It is the one layer that cannot be inspected after the tile goes on, and a failure behind finished tile is a strip-out, not a repair. The membrane has to be applied to the wet areas, allowed to cure, and checked before any tiling begins. Confirming who applies it, to what standard, and that it is signed off as its own step is the single most important item on the checklist.

Do I need a permit to renovate a bathroom in Canada?

It depends on scope and province. A like-for-like cosmetic refresh that does not move plumbing or electrical often needs no permit. The moment you relocate the toilet, vanity, or shower, add or move circuits, or alter the structure, a building, plumbing, or electrical permit is generally required and the work must be inspected. Permit triggers and the code vary by province, each adapting the National Building Code and National Plumbing Code of Canada, so confirm with your municipal building department before work starts.

In what order should a bathroom renovation be done?

Planning and budget first, then design and selections, then trades, permits, and contract, then the build: order long-lead items, demolition, structural and first-fix plumbing and electrical, inspection of the rough-in, backer board, waterproofing and its sign-off, tiling, second-fix plumbing and electrical, the vanity, toilet, and fixtures, ventilation, and a defects inspection before final payment. The waterproofing sits in the middle as a hold point that the tiling cannot start before.

How much contingency should a bathroom renovation budget include?

Between 10 and 20 percent of the project cost. A bathroom is a wet room, so the condition behind the walls — plumbing that must be brought up to code, a subfloor rotted by an old leak, or wiring that no longer meets the Canadian Electrical Code — is both common and discovered only at demolition. A contingency turns that into a planned line rather than a crisis negotiated from weakness.

What temperature should bathroom water be limited to in Canada?

The National Plumbing Code of Canada sets a maximum of 49°C at showers and bathtubs, achieved with a pressure-balanced or thermostatic valve that protects against scalding. The valve type is part of the shower selection, because it affects the rough-in, so it belongs on the design checklist rather than being discovered at second fix. Confirm the requirement that applies in your province.