Can I retile my shower walls myself?

Retiling shower walls yourself is technically possible, but it's one of the more challenging DIY projects a homeowner can take on — and the consequences of doing it wrong go well beyond cosmetic issues.

The core challenge isn't the tile itself — it's the waterproofing underneath. A shower wall system has to manage constant water exposure, steam, and temperature changes. If the waterproof membrane is improperly installed, water infiltrates behind the tile, leading to mold, rot, and eventually structural damage that can cost far more to fix than hiring a professional in the first place. Most DIY shower tile failures aren't visible for 1-3 years, by which point the damage is significant.

What's involved in a proper shower retile goes beyond pulling off old tile and sticking new ones up. You need to assess the existing substrate (cement board, Schluter Kerdi, or similar), apply a proper waterproof membrane with correctly lapped seams, use the right thinset mortar for the tile type, maintain consistent grout joints, and seal everything correctly. Large-format tiles (increasingly popular in Ottawa bathrooms) also require back-buttering and a very flat substrate — any deviation causes lippage and cracking.

In Ottawa's climate, freeze-thaw cycles and humidity swings put extra stress on tile installations. Grout and caulk joints at corners and transitions need to be done correctly to flex with the building movement — a common DIY miss that leads to cracking and water infiltration.

If you're set on DIY, the most honest advice is: limit it to a cosmetic retile over a solid, verified substrate — and even then, invest in a quality waterproof membrane like Schluter Kerdi or RedGard. If there's any doubt about what's behind your current tile, or if you're seeing soft spots, discoloration, or failing grout, that's a job for a licensed contractor.

For a proper shower retile with waterproofing done right, Ottawa homeowners typically invest $3,000–$8,000 depending on size and tile selection. For a free estimate on your project, feel free to reach out to Ottawa Bathrooms — we're happy to walk you through what's involved before you decide which route to take.