Just wondering how tilers measure up. I have an area tiled measuring 100 yd2 from my drawings - all floor tiling. had 112 yd2 used including breakage, cutting etc. The tiler has billed me for 120 yd2. The area was not agreed beforehand - just the rate per yd2. I have my drawings, my own measurements and delivery dockets from the tile shop. What should I do?