Waste is not simply discarded material. It covers cuts, selection, defects, layout alignment, breakage, and a small reserve for future repairs.
Start with layout complexity
Simple rectangular rooms with straight installation may fit within 8–10%. Diagonal layouts, herringbone, many obstacles, or small-format tile often need 12–20%.
Respect package rounding
A calculated 10% allowance can become a larger effective allowance when the final box rounds up. Review the exact purchase area and whole-box result together.
Keep attic stock
A few matching pieces are valuable because colour lots and product lines change. Store them flat, dry, and labeled with the room and product information.
Practical takeaway
Choose waste from the layout and room—not a fixed habit—and preserve the assumption with the saved project.
Related flooring & tile guides
Tile box coverage: why nominal size is not enough
Use the exact tile carton coverage to turn a measured area into whole boxes, while keeping nominal size, actual dimensions and waste separate.
How to measure an irregular floor
Break an L-shaped or curved floor into auditable rectangles, triangles, and circles.