Most flooring jobs need 5 to 10 percent extra for straight-lay plank or tile in simple rooms, 10 to 15 percent for diagonal layouts or chopped-up floor plans, and 15 to 20 percent for herringbone, chevron or large-format tile in small spaces. Broadloom carpet and sheet vinyl are the exception. Their waste comes from roll width and seam placement, so you work it out from a seam layout, not a flat percentage.
Get waste wrong in one direction and you run short, then wait on a reorder that may not match the original dye lot. Get it wrong in the other and you carry hundreds or thousands of dollars of extra material in your bid, which is how you lose to the contractor down the street. Here is how to set waste so neither happens.
What a waste factor covers
A waste factor is the percentage you add to the net measured area (what actually gets covered) to get the gross quantity you order. It covers:
- Cuts at walls, doorways, columns and casework
- Offcuts too short to reuse
- Breakage and damaged pieces, especially tile and stone
- Boards culled for defects or color
- Pattern matching in carpet, sheet goods and directional products
- Rounding up to full cartons or rolls
It does not cover attic stock. More on that below.
Waste factor by material and layout
These are the starting ranges published across flooring guides and calculators (Flooring Clarity, Calcuris). Treat them as a starting point and adjust for the job in front of you.
| Material | Straight lay, simple rooms | Diagonal or chopped-up rooms | Herringbone, chevron or patterned |
|---|---|---|---|
| LVP, LVT, laminate | 5–10% | 10–15% | 15–20% |
| Engineered and solid hardwood | 5–10% | 10–15% | 15–20% |
| Ceramic and porcelain tile | 10% | 15% | 20% |
| Large-format tile (24 in and up) | 10–15% | 15% | 15–20% |
| Carpet tile | About 5% | 5–10% (small rooms, borders) | Add more for multi-color patterns |
| Broadloom carpet and sheet vinyl | From the seam layout | From the seam layout | Seam layout plus pattern repeat |
What pushes waste up or down
Room shape. One big open area wastes less than the same square footage split into offices, closets and corridors. Every wall, jog and doorway produces an offcut.
Piece size vs. room size. Long planks and big tiles look great, but in a 5-foot closet a 72-inch plank leaves an offcut you may never reuse. Small rooms with large-format material are where waste climbs fastest.
Layout direction. Diagonal layouts leave a triangular offcut at every wall. Herringbone and chevron add angled cuts at every edge.
Pattern repeat and direction. Patterned carpet needs extra to match the repeat at seams. Directional products, such as some carpet tile and LVT visuals, limit how you can reuse cuts.
Material grade. Lower grades of hardwood come with more boards you will cull.
Rounding. You cannot buy 0.4 of a carton. Round up per finish code across the whole job, not room by room, or you will buy a partial carton of waste for every room.
Why roll goods need a seam layout, not a percentage
Broadloom carpet usually comes off 12-foot rolls, and how a room’s dimensions divide by 12 drives most of the waste.
Take a 15 ft x 20 ft room: 300 SF, or 33.3 SY.
- Run the carpet the long way (20 ft drops). You need a 12 ft x 20 ft piece plus a 3 ft x 20 ft fill. If you cut that fill from a second 20 ft drop and cannot use the leftover 9 ft x 20 ft anywhere else, you have bought 480 SF to cover 300.
- Run it the short way (15 ft drops). You need a 12 ft x 15 ft piece plus an 8 ft x 15 ft fill cut from a second 15 ft drop. Now you buy 360 SF (40 SY) and throw away a 4 ft x 15 ft strip.
Same room, very different material cost. Across a full building, leftovers from one room can fill another, which is why estimators lay out roll goods in seaming software such as MeasureSquare or RFMS Measure (compared here) instead of guessing a percentage. Seams also have to respect traffic flow, light direction and pile direction, so the cheapest layout is not always one you can use. Sheet vinyl and sheet rubber follow the same logic; 6 ft 6 in and 12 ft rolls are common widths.
Base, transitions and stair parts: count them, do not percent them
Linear and count items do not behave like area. Wall base comes in coils or 4 ft pieces, so measure LF, count inside and outside corners, and add a little for joints and scribing. Transitions come in stock lengths, so a 3 ft doorway might use a third of a 12 ft stick, or a whole stick if the leftovers do not line up with other openings. Stair treads, risers and nosings are counted one by one. A flat 10 percent on these lines is either too much or nowhere near enough.
Waste vs. attic stock
Many commercial specs require you to hand extra material to the owner at closeout for future repairs. It usually shows up in Division 01 or in an “extra materials” or “maintenance materials” article inside the Division 09 flooring section. That material is a deliverable, not waste. Price it as its own line so the GC can see it, and so it does not vanish when someone trims your waste factor to get the number down.
A worked example
Here is how waste flows through a bid. Carton sizes vary by product, so always check the manufacturer’s data.
LVP, straight lay, lots of small rooms. Net area 4,200 SF. Waste of 10 percent gives 4,620 SF. At 23.6 SF per carton that is 195.8 cartons, so you order 196 cartons (4,625.6 SF).
Porcelain tile, 12 x 24, one-third offset, bathrooms and corridors. Net area 850 SF. Waste of 15 percent gives 977.5 SF. At 15.5 SF per carton that is 63.1 cartons, so you order 64 (992 SF).
Price material on the gross quantity. Most installers price labor on the net installed area, so make sure your labor line uses the right number.
The cost of guessing
Too much waste loses bids just as surely as too little waste loses money. On a 20,000 SF LVT job with material at $3.00 per SF, every extra 1 percent of waste adds $600 to your material cost. Pad waste by 5 points “to be safe” and you have added $3,000 before labor, overhead or profit.
Common waste mistakes to watch for:
- One percentage for the whole job
- Adding waste twice, once in the software and again in the spreadsheet
- Using a percentage on carpet or sheet goods instead of a seam layout
- Leaving out attic stock, or burying it inside waste
- Rounding cartons room by room
Frequently asked questions
What is the standard waste factor for flooring?
For straight-lay plank and tile in normal rooms, 10 percent is the most common default. Go lower (5 to 7 percent) on big open areas and higher (15 to 20 percent) for diagonal, herringbone or small rooms with large pieces.
How much extra LVP should I order?
About 5 to 10 percent for a straight lay, 10 to 15 percent for diagonal layouts or lots of small rooms, and 15 to 20 percent for herringbone LVP.
How much extra tile do I need for herringbone?
Plan on 15 to 20 percent, and more with long, narrow tiles or a border. Published guidance for herringbone tile ranges from 10 to 20 percent depending on tile size, room shape and installer skill (Flooring Clarity).
Do you add a waste factor to carpet?
Not as a flat percentage if you can avoid it. Lay out the seams on the actual roll width first, then measure what you need. The gap between a good and a bad seam layout can be bigger than any percentage you would pick.
Should waste be included in my bid price?
Yes. Your material cost should reflect the gross quantity you will buy, including waste and rounding to full cartons or rolls. Labor is usually priced on the net installed area.
Get waste right on your next bid
A good takeoff shows net and gross quantities by finish code, waste set by material and layout, and seam layouts for carpet and sheet goods, so you can see where every square foot comes from. Send your plans to info@floorprotakeoffs.com or call +1 832-583-1156 for a quote. There is no upfront payment: you pay after the takeoff is delivered and you are satisfied. New to estimating? Start with our step-by-step guide to estimating a flooring job, or see our services.
About the author: Syed Umair Ali is the founder of Floor Pro Takeoffs in Sugar Land, Texas. A civil engineering graduate with 8 years in flooring estimating and subcontracting support, he has completed more than 3,000 flooring takeoffs and estimates for contractors, flooring companies and estimating teams.