You may or may not have a case for the contractor to redo.
If it meets these standards (which are pretty loose), it will be harder to force them to fix it.
Lippage - Floor DetectiveFloor Detective
Quote:
Lippage
The Tile Council of north America defines Lippage as “a condition where one edge of a tile is higher than an adjacent tile, giving the finished surface an uneven appearance. Lippage is inherent in all ceramic installation methods and may also be unavoidable due to the tile tolerances, in accordance with ANSI A137.1. The following is excerpted from ANSI A108.02, Section 4.3.7:
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Good luck.