How Much Extra Flooring Should You Order? The 5%, 10% and 15% Waste Rule

Why the Waste Factor Exists — and Why Skipping It Costs You More

Flooring is sold in cartons covering a fixed square footage. Your room is not a perfect rectangle that fits evenly into carton coverage. Cut pieces are generated at every wall, every doorway, every offset, and every plank that reveals a defect when cut. Those cut-offs cannot be re-used at full length.

The waste factor accounts for this reality. Order too little and you run short before the floor is complete — then face a secondary order (additional shipping), possible dye-lot variation, and a delay that may leave your project unfinished. Order the right amount and you finish the floor cleanly with material left over for future repairs.

The waste factor is not padding invented by flooring retailers to sell more product. It is the documented real-world difference between measured square footage and installed square footage on every flooring project.

When 5% Waste Is Enough

The 5% waste factor is appropriate in a narrow set of conditions:

• A single large, square or rectangular room with no alcoves, closets, or offsets
• Straight installation parallel to the longest wall
• A room where the width divides evenly (or nearly so) into plank width — minimizing narrow cut strips at the far wall
• No diagonal patterns, no irregular angles

In practice, very few residential projects qualify for 5%. Even a bedroom with a walk-in closet, a bay window bump-out, or an irregular angle moves the project to the 10% range. If in doubt, use 10% — the cost of one extra carton is always less than the cost of running short.

When 10% Is the Standard — Most Florida Homes

Ten percent is the industry standard waste factor for most residential flooring projects. It applies when:

• Multiple connected rooms are being floored in the same direction
• The layout includes closets, hallways, or bathroom entries
• The room has at least one non-90-degree angle or offset
• Standard straight installation (planks run parallel to the longest wall)

For Florida open-plan homes — great rooms connecting to dining areas, hallways leading to bedrooms — 10% is almost always the correct starting point. We recommend 10% as the default for every project unless the site assessment clearly qualifies for 5% or requires 15%.

When 12–15% Is Required

Use 12–15% when the layout has:

• Numerous corners — L-shaped or U-shaped floor plans
• Angled walls that are not 90 degrees
• Multiple small rooms being connected (each room end generates a fresh cut row)
• Bay windows, curved walls, or fireplace hearth cut-outs
• A long, narrow hallway connected to a larger room (the plank direction change wastes material at the transition)

Older Florida homes built before open-plan construction became standard — homes with many defined rooms, angular layouts, and separate dining rooms — frequently fall into the 12–15% category.

Diagonal, Herringbone, and Chevron: 15–20%

Pattern installations waste significantly more material because every wall cut produces a large triangular offcut that cannot be reused at the other end of the same row. This is not inefficiency — it is geometry. The angles dictate the waste.

• Diagonal (45°): 15–20% waste. Every wall generates a triangular cut-off the size of half a plank or more.
• Herringbone: 15–20% waste. Short planks in a regular pattern, but the alternating direction generates significant off-cuts at borders.
• Chevron: 18–25% waste. Mitered plank ends mean every plank is cut at an angle — the cut-off from one end cannot fit at another end.

Pattern installations also increase labor cost significantly. Get a professional estimate before committing to a pattern — the material and labor premium is real.

Stairs: Calculate Separately, Not With Room Waste

Stairs must always be measured and ordered as a separate line item — never included in the room waste calculation. Here's why: stairs use dedicated stair tread products, not standard planks from the floor cartons. Adding stair square footage to your room calculation creates a material budget for the wrong product.

How to calculate stair material:

1. Count the number of steps
2. Subtract one for the top landing (which takes a landing nose, not a full tread cap)
3. Order one stair tread per remaining step
4. Order one landing nose for the top edge
5. Add left or right return pieces for any open-sided steps
6. Add 10% extra or one spare piece

For the complete stair measurement guide, read our dedicated article: How to Measure Stairs for LVP Stair Treads.

1,000 Square Foot Reference Table

If you have a 1,000 square foot home, here is exactly how many cartons you need at different waste percentages and carton sizes.

Always round up to the next whole carton. Partial cartons are not available.

Real Product Carton Examples From Our Collections

Here are real coverage numbers from products we carry, so you can use the calculator above with actual numbers rather than guessing:

Coverage per carton varies by plank size and packing. Always use the exact figure printed on the carton label — not the product page — as coverage can change between production runs.

Keep a Repair Reserve — Always

After installation, keep at least one sealed carton in a climate-controlled location inside your home. This is your repair reserve for the life of the floor.

Here is why this matters: LVP products are updated, reformulated, and discontinued regularly. When a plank is damaged by a heavy object drop, pet scratch, or furniture accident two years after installation, you need a piece from the same production run — not a replacement product that looks "close." Even products that remain in the catalog are regularly updated with new dye lots and texture embossing that can differ noticeably from the original.

A single sealed carton costs $30–$120 depending on the product. The peace of mind of knowing you have an exact-match repair piece is worth every cent. This is the single most important advice experienced installers give homeowners after a job is complete.