Concerning Carpeteria - San Leandro CA Don't let them near a calculator and recommend the amount of tiles required. Based on the submitted drawings, 76 square feet of 6x3 tiles was the surface area to be covered. They calculated out the number of boxes of tiles required taking into consideration cutting and possible breakage. At the end of the job 2 boxes of tiles (25 square feet) were let over. When asked to return the unopened boxes, they were quick to point out that the signed sales order doesn't allow for returns; regardless of their miscalculation.
The industrystandard is 5% extra for cutting and breakage - they added 25%. That's a quick way to sell more tiles...