Order too little and you're making a second supply run mid-job. Order too much and your margin bleeds. Calculate the exact quantity to order—with the right waste factor for material type, pattern, and cut complexity—so your material takeoff is right the first time.
A 10% waste factor on tile doesn't mean your installers are wasteful — it means the cuts required to fit tile around corners, outlets, and edges generate offcuts that can't be reused. A diagonal tile layout generates 15% waste even with perfect cuts because the geometry of a 45° angle requires more material at the perimeter. Complex mosaic patterns can waste 20–25% because every pattern repeat at a wall edge is a partial cut. Understanding why waste happens at each material and layout type is how you order correctly — not with a flat 10% applied to everything regardless of pattern or room shape.
Running out of material mid-installation is never just a supply run. It's an interruption to the crew's rhythm, a potential dye-lot mismatch if the material was from a tinted batch, a delay if the product isn't in stock locally, and a potential extra delivery fee. On tile jobs, a dye-lot mismatch means visible color variation in the finished floor. On flooring jobs, running short on a discontinued product means a full replacement. The cost to order 10% more than you think you need is almost always less than the cost of running short. Overage returns are your safety valve — most suppliers accept returns on unopened boxes.
Whatever excess material remains after the job is complete, leave it with the homeowner — clearly labeled with the product name, lot number, color code, and where it was purchased. A cracked tile in year 3, a damaged plank in year 5, or a paint touch-up in year 2 is a 20-minute fix if the homeowner has matching material. Without it, they're trying to find a color match on a product that may have been discontinued. This is a service point that costs you nothing — the material is already paid for — and every homeowner remembers the contractor who thought ahead.
The Tradesman's Business Starter Kit includes material takeoff worksheets, markup calculator, and service agreement template. Guide from $19 — Complete Kit with all 19 templates, $49.
Get the Business Kit — $19Waste is a cost of doing business, not a mistake — but it needs to be priced in. Enter your material quantity, unit cost, and trade-standard waste percentage to get the correct order quantity and total material cost including waste. Use it to stop under-ordering materials and making mid-job supply runs, or to make sure your quotes include the full cost of what gets cut and discarded.