After 25 years of bathroom renovations in Toronto and the GTA, we have seen every mistake homeowners make going into a project. Most of them are avoidable. Here are the ten things we wish every client knew before we started.
1. Waterproofing Is Everything
The tile is what you see. The waterproofing is what determines whether the renovation lasts five years or twenty-five. Failed waterproofing is the single most common cause of structural damage in renovated bathrooms water gets behind the tile, into the framing, and causes mold and rot that costs far more to fix than getting it right the first time. Ask every contractor specifically what waterproofing system they use and what warranty they back it with. See our guide on what Wedi Pro waterproofing is and why it matters.
2. Substrate Preparation Matters More Than the Tile You Choose
Large-format tile on an improperly prepared floor will crack. Any tile on a wall with movement will pop. The substrate the surface the tile is bonded to has to be flat, stable, and moisture-resistant. This preparation work is invisible once the project is done, but it determines how long everything holds up. A contractor who skips or rushes this step is saving time at your expense.
3. Budget for What You Cannot See
Toronto homes, particularly pre-war and post-war builds, regularly produce surprises behind the walls. Old waterproofing failures, galvanized supply lines, knob and tube wiring, subfloor rot. A responsible contractor documents every discovery and gets your approval before doing anything additional. Set aside 10 to 15 percent of your budget as a contingency for exactly this reason.
4. Some Projects Require Permits and That Is Not Optional
Moving a drain, relocating a toilet, adding a showerhead on a new wall, or any structural change typically requires a permit. A contractor who tells you permits are not necessary for these changes is either wrong or cutting corners. Work done without required permits can cause problems when you sell, and some insurance policies will not cover damage in unpermitted spaces.
5. Plan for the Real Timeline, Not the Optimistic One
A small bathroom renovation takes 2 to 3 weeks. A master bathroom takes 4 to 6 weeks. These are realistic timelines from demolition to final walkthrough not best-case scenarios. Material lead times, inspection scheduling, and the occasional discovery behind a wall all affect the schedule. A contractor who quotes you a week for a full gut renovation is either very optimistic or leaving things out.
6. Lock In Your Design Before Demolition Starts
Changing your mind about tile layout after the substrate is in costs money. Changing it after tile is ordered costs more. Changing it mid-installation costs the most. Our free 3D design process exists specifically to front-load all decision-making before anything is demolished. See exactly what your finished bathroom looks like, make every change at the design stage, and start construction only when you are certain. Learn more about our free 3D design service.
7. If You Only Have One Bathroom, Make a Plan
Most clients with a single bathroom stay in their home during the renovation. A good contractor will sequence the work to minimize the period where the bathroom is completely non-functional typically the first few days of demolition. Talk to your contractor about this in advance. Some clients arrange to stay elsewhere for the first few days. Others make arrangements with neighbours or family. Either way, have the conversation before demo day.
8. The Cheapest Quote Is Rarely the Best Value
A quote $8,000 lower than the others you received is almost certainly missing something. Waterproofing. Substrate preparation. Permit fees. Disposal costs. Fixture installation. Compare quotes line by line, not number to number. See our guide on how to choose a bathroom renovation contractor for what to look for.
9. Material Lead Times Are Real
The tile you want may not be in stock. Custom vanities take 6 to 10 weeks. Specific fixtures can have 4-week lead times. A contractor who starts demo before materials are confirmed and on order is creating a scheduling risk. We do not schedule demolition until all materials are either in stock or have confirmed delivery dates that align with the construction timeline.
10. Communication Is Part of the Job
A professional contractor communicates proactively. You should not be calling to find out what is happening in your home your contractor should be telling you. Before work starts, establish how you will communicate, how often, and who to call with questions. At Pilkowski, every client has a direct line to Chris throughout the project. If something changes, you hear about it the same day.
If you are planning a bathroom renovation and want to talk through any of these points, get in touch. We offer free in-home consultations with no obligation.
