Short definition
An extra percentage added to a flooring quantity to cover offcuts, pattern matching, damaged pieces and installation losses.
Wastage allowance is the buffer between the raw measured area of a floor and the amount of flooring actually ordered. If you measure a 100 m² job and order exactly 100 m² of vinyl plank, you will run out — every cut around a doorway, every short plank in a row, every damaged board is material removed from the usable pile.
Typical wastage allowances by material:
• Vinyl plank: 7–10% • Vinyl sheet: 5–10% depending on shape complexity • Carpet (broadloom): 5–15% depending on room dimensions vs roll width (a 5m room from a 3.66m roll has higher wastage than a 3m room) • Carpet tiles: 5–7% • Laminate / engineered timber: 7–10% • Tile: not a single figure per material. It is derived per room from the lay pattern, straight 10%, brick bond 12%, diagonal 15%, herringbone 20–30%, plus 2% where a tile has a side of 600 mm or more and 5% where the room is under 3 m². See tile wastage by pattern.
The allowance compounds two effects: real material loss (cuts, damage, the offcut at the end of a plank row) and a safety margin so the job does not stop because someone has to drive back to the warehouse for one more box.
In AreaSum, you set a wastage percentage per material on each project. Tile is the exception: a tile room takes its figure from the lay pattern, and any room can override it. The exported report shows both the raw measured area and the area with wastage applied, so the customer sees the basis of the quote and the order line matches what gets installed.
Worked example
A 95 m² vinyl plank job at 10% wastage means ordering 95 × 1.10 = 104.5 m² of plank. Round up to whole boxes per the supplier carton size.