Does the Ontario New Home Warranty cover defective tile installation in a new Ottawa build?

Yes, the Ontario New Home Warranty program — administered by Tarion Warranty Corporation — covers defective tile installation in new Ottawa homes, but the coverage has specific terms, timelines, and limitations that homeowners need to understand to protect their interests.

Tarion warranty coverage for new homes in Ontario is structured in tiers. For tile installation defects, the most relevant coverage periods are the one-year warranty covering defects in materials and workmanship, and the two-year warranty covering defects in materials, including water penetration through the building envelope and defects in plumbing, heating, and electrical systems. Tile installation issues typically fall under the one-year workmanship warranty, which covers problems like poorly laid tile with visible lippage, cracked or loose tiles, defective grouting, improper tile layout, and tiles that debond from the substrate due to poor installation technique.

The two-year warranty becomes relevant when tile defects involve water penetration — for example, if defective waterproofing behind shower tile allows water to penetrate into the wall cavity or subfloor. This is actually the more serious and more common warranty issue with tile in new Ottawa builds. A shower that was not properly waterproofed during construction may not show visible signs of failure for months, but by the time water stains appear on the ceiling below or mould develops in the wall cavity, the damage can be extensive.

Tarion also provides a seven-year major structural defect warranty, which could apply in extreme cases where defective tile work in a shower or bathroom has caused structural damage — significant water damage to floor joists, subfloor rot, or compromised load-bearing elements — though this is relatively rare.

To make a warranty claim, you need to submit your concerns to Tarion within the applicable warranty period using their online portal or by contacting them directly. Tarion follows a specific process: first, you must notify your builder in writing of the defect and give them a reasonable opportunity to repair it. If the builder does not address the issue satisfactorily, Tarion will investigate and may order the builder to perform repairs. Document everything with dated photographs from the day you first notice the defect.

There are important limitations to be aware of. Tarion's warranty does not cover normal wear and tear, damage caused by the homeowner's actions or neglect, or cosmetic imperfections that were visible at the pre-delivery inspection (PDI) but not noted at that time. This makes your PDI critically important — inspect every tiled surface carefully for lippage, cracked tiles, grout voids, uneven surfaces, and any signs of poor workmanship. Note every deficiency on the PDI form, no matter how minor it seems. Defects documented at the PDI are much easier to get resolved than issues raised later.

For Ottawa homeowners taking possession of a new build, pay particular attention to shower and bathroom tile waterproofing. Ask your builder to confirm the waterproofing system used (membrane type, installation method) and whether it was inspected before tile was installed. A proper waterproofing system is invisible once the tile is in place, but it is the single most important element of the installation.

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