The grout lines in our kitchen are uneven width — is that poor workmanship?

Uneven grout lines are typically a sign of poor workmanship, especially if the variation is noticeable and consistent throughout the installation. Professional tile setters should maintain uniform grout line widths using spacers and proper layout techniques.

Several factors can cause uneven grout lines. The most common issue is inconsistent use of tile spacers during installation, or using tiles that aren't perfectly square or uniform in size. Some handmade or rustic tiles naturally have slight size variations, but even then, a skilled installer should compensate with layout adjustments and consistent spacing. Poor substrate preparation can also cause tiles to sit unevenly, making it impossible to maintain uniform grout lines.

In Ottawa's market, quality tile installation should show consistent grout lines typically ranging from 1/16" for rectified tiles up to 1/4" for natural stone, depending on the tile type and design intent. The Ontario Building Code doesn't specify grout line width, but industry standards and manufacturer guidelines do. Most reputable contractors will guarantee their workmanship and should address obvious installation defects.

The width variation matters more than the actual size. If your grout lines vary significantly (more than 1/32" difference), especially in a grid pattern, this suggests the installer didn't use proper techniques. However, if you have natural stone or handmade tiles, some variation might be intentional for aesthetic reasons. The key is whether the variation looks deliberate and professionally executed.

Document the issue with photos and contact your installer if the work was done recently. Most licensed contractors will return to address workmanship issues, especially if the installation doesn't meet industry standards. For future reference, always verify that your contractor uses proper spacers and layout techniques before grouting begins.