No matter what size area you work on, you will generally need to cut at least one tile.
Most tiled areas require at least one hole to be cut. The key to cutting rectangles and squares in tiles is to avoid cutting beyond the corners.
1. Cut circles in tiles
Firstly, Score the circle outline.
Mark the circle on the tiles then score the profile with an angle grinder.
Before removing the excess tile, make short cuts on both sides of the semicircle (A and B).
Connect the cuts (C) by making a series of progressively deeper shallow cuts.
2. Make short radial cuts
Complete the semicircle with a series of spoke-like radial cuts.
Remove the tabs with a tile nipper and clean up the rough edges with the angle grinder.
3. Clean up
Grind the edges smooth, working slowly around each curve.
TIP: Buy a square waste outlet, not a round one, for easier cutting.