How Much Flooring Should I Order? Waste Allowance Explained
One of the easiest flooring mistakes to make is ordering exactly the same number of square metres as the measured floor area.
If your project measures 80m², ordering exactly 80m² may sound correct — but in most cases, it leaves no allowance for cuts, offcuts, damaged boards or future repairs.
That extra material is known as the waste allowance.
For many standard flooring projects, a practical starting point is around 5–10% extra, while more complex layouts may require more.
So, how much flooring should you actually order?
This guide explains how to calculate your floor area, choose an appropriate waste allowance, convert the result into complete boxes and decide whether to keep spare flooring for future repairs.
Quick Answer: For many straightforward residential projects, allow around 5–10% extra flooring above the measured area. Use less for simple rectangular rooms and more for complex layouts, diagonal installations or specialised patterns.
Then round up to complete boxes.
Why Do You Need a Waste Allowance?
Flooring cannot usually be installed using every plank exactly as it comes out of the box.
Boards often need to be cut around:
- Walls
- Doorways
- Hallways
- Corners
- Kitchen cabinetry
- Built-in wardrobes
- Columns
- Room transitions
Some offcuts can be reused, but others will be too short, the wrong orientation or unsuitable for the next row.
Extra flooring may also be needed for:
- Incorrect cuts
- Damaged boards
- Manufacturing defects
- Pattern selection
- Future repairs
- Replacement boards
Waste allowance is part of the installation plan — not simply wasted material.
Step 1: Calculate the Floor Area
For a simple rectangular room:
Length × Width = Floor Area
For example:
5m × 4m = 20m²
If the project includes several rooms, measure each area separately and add them together.
Step 2: Add the Waste Allowance
Once you know the measured area, multiply it by the waste factor.
| Waste Allowance | Calculation |
|---|---|
| 5% | Area × 1.05 |
| 7% | Area × 1.07 |
| 10% | Area × 1.10 |
| 15% | Area × 1.15 |
For example, if the measured floor area is 60m²:
60 × 1.10 = 66m²
So with a 10% allowance, you would plan for 66m² of flooring.
Flooring Waste Calculator: Quick Reference
| Measured Area | 5% Extra | 10% Extra | 15% Extra |
|---|---|---|---|
| 20m² | 21m² | 22m² | 23m² |
| 40m² | 42m² | 44m² | 46m² |
| 60m² | 63m² | 66m² | 69m² |
| 80m² | 84m² | 88m² | 92m² |
| 100m² | 105m² | 110m² | 115m² |
Is 5% Extra Flooring Enough?
It can be.
A waste allowance around 5% may be reasonable where the project is very straightforward, such as:
- One large rectangular room
- Straight plank installation
- Few doorways
- Minimal cutting
- Experienced installation
- Simple wall lines
However, 5% does not leave much margin for error.
For a whole-home project or a layout with several rooms, 5% may be too tight.
When Is 10% a Better Allowance?
For many residential projects, around 10% is a practical planning allowance.
It is particularly useful where the installation includes:
- Multiple rooms
- Hallways
- Several doorways
- Kitchen areas
- Built-in cabinetry
- Irregular wall lines
- More complex cuts
For many Melbourne homes, 10% is a sensible starting point when the project is more complex than one simple rectangular room.
When Might You Need More Than 10%?
Some layouts naturally create more waste.
A higher allowance may be needed for:
- Diagonal installation
- Herringbone
- Chevron
- Small irregular rooms
- Multiple narrow hallways
- Many corners
- Strong pattern matching
- Selective colour grading
In these situations, 10–15% or more may be appropriate.
The correct allowance should be based on the actual layout and installation pattern rather than a fixed rule.
Straight Lay vs Diagonal Lay
Straight Lay
Boards are installed parallel to the main wall or room direction.
This generally creates less waste because suitable end cuts can often be reused at the start of another row.
Diagonal Lay
Boards are installed at an angle.
This creates more angled perimeter cuts and generally produces more offcuts that cannot be reused.
Decorative installation patterns usually require a higher waste allowance than standard straight-lay flooring.
What About Herringbone Flooring?
Herringbone usually requires a higher waste allowance than standard plank flooring.
Reasons include:
- More perimeter cuts
- Pattern alignment
- Left/right board orientation
- Smaller reusable offcuts
- Greater layout complexity
Do not automatically use the same 5–10% allowance you would use for standard straight planks.
For specialised patterns, calculate the requirement specifically for that product and layout.
Measure Each Room Separately
If the property contains several rooms, measuring them separately is usually more accurate than estimating the entire home as one large rectangle.
For example:
| Area | Length | Width | Area |
|---|---|---|---|
| Living Room | 6m | 5m | 30m² |
| Dining Area | 4m | 3m | 12m² |
| Bedroom | 4m | 3.5m | 14m² |
| Hallway | 6m | 1.2m | 7.2m² |
| Total | 63.2m² |
At a 10% allowance:
63.2 × 1.10 = 69.52m²
So the planned requirement is approximately 69.5m² before rounding to full boxes.
Step 3: Convert Square Metres Into Boxes
Flooring is generally sold by the carton, not by an exact square metre amount.
Each carton covers a fixed area.
For example:
Coverage per box: 2.20m²
Required flooring including waste:
69.5m²
Calculation:
69.5 ÷ 2.20 = 31.59 boxes
You cannot buy 31.59 boxes.
You need to round up to:
32 boxes
That gives:
32 × 2.20 = 70.4m²
Always round up to complete boxes. Never round the carton quantity down.
How Many Boxes of Flooring Do I Need?
| Flooring Required | Coverage Per Box | Calculation | Boxes to Order |
|---|---|---|---|
| 44m² | 2.2m² | 44 ÷ 2.2 | 20 |
| 50m² | 2.2m² | 50 ÷ 2.2 = 22.73 | 23 |
| 66m² | 2.2m² | 66 ÷ 2.2 | 30 |
| 69.5m² | 2.2m² | 69.5 ÷ 2.2 = 31.59 | 32 |
Should You Add Waste Before or After Calculating Boxes?
Add the waste allowance before calculating how many cartons you need.
The correct sequence is:
- Measure the floor area.
- Add the waste allowance.
- Divide by the coverage per box.
- Round up to the next complete box.
Boxes Required = (Measured Area × Waste Factor) ÷ Box Coverage
Then round up.
Should You Subtract Kitchen Cabinets?
Not automatically.
Many hybrid and laminate products are installed as floating floors and should not be trapped beneath permanent cabinetry.
In these installations, flooring may be laid around fixed cabinets rather than underneath them.
But the correct measurement depends on:
- Flooring type
- Installation method
- Cabinet layout
- Installation sequence
- Manufacturer requirements
Measure according to where the flooring will actually be installed. Confirm the flooring and cabinetry plan before deducting fixed areas.
What About Wardrobes?
If flooring is going inside a wardrobe, include that area.
Do not exclude a wardrobe just because it is a small space.
Across several bedrooms, wardrobes can add a meaningful amount to the total flooring requirement.
Should You Keep an Extra Box for Future Repairs?
In many cases, yes.
Flooring ranges can change or disappear over time.
A product available today may later be:
- Discontinued
- Updated
- Replaced
- Produced in a different batch
- Difficult to match exactly
Keeping one spare carton from the original installation can be useful if a damaged board needs to be replaced years later.
If you have storage space, keeping one spare box from the original batch is often worth considering.
Where Should Spare Flooring Be Stored?
Store spare boards in a clean, dry area protected from:
- Rain
- Ground moisture
- Excessive humidity
- Extreme heat
- Direct sunlight
Keep the original product label if possible.
Useful information may include:
- Product name
- Colour
- Batch number
- Plank dimensions
- Supplier details
This can make future identification much easier.
Should You Order Extra for Colour Variation?
Potentially.
Some timber-look flooring includes deliberate colour and grain variation between boards.
During installation, boards may be selected from several boxes to create a balanced appearance across the room.
A small amount of extra material can provide more flexibility where the floor has strong visual variation.
This is particularly relevant for products designed to reproduce a more natural timber appearance.
Can You Reuse Flooring Offcuts?
Yes, when the offcut is suitable.
A good installation layout often reuses end cuts at the beginning of later rows.
This can reduce waste while helping create a natural stagger.
However, reused boards still need to comply with:
- Minimum plank-length requirements
- End-joint spacing
- Locking-system requirements
- Visual layout
- Manufacturer instructions
Don’t force every offcut back into the floor simply to reduce waste. Good layout and joint placement are more important than achieving zero waste.
Why Ordering Too Little Can Be Expensive
Running short partway through installation can create several problems.
The product may:
- Be temporarily out of stock
- Come from a different production batch
- Have a slight colour variation
- Be discontinued
- Take several days or weeks to reorder
The installation may also need to stop until the additional material arrives.
Ordering slightly too much is usually easier to manage than discovering you are one box short halfway through the installation.
But Don’t Automatically Order 15–20% Extra
More is not always better.
For a simple rectangular room, ordering 15–20% extra may be unnecessary.
Excess material means:
- Higher upfront cost
- More delivery weight
- More storage
- More unused stock
The aim is to order enough for the project plus a sensible margin — not to maximise the waste percentage.
Common Flooring Measurement Mistakes
1. Ordering Exactly the Measured Area
A 50m² floor does not normally mean you should order exactly 50m² of flooring.
You still need an allowance for cuts and offcuts.
2. Forgetting Small Areas
Hallways, wardrobes, pantry areas and small connecting spaces can add several square metres.
3. Rounding the Box Quantity Down
If your calculation gives 21.2 cartons, you need 22 cartons.
4. Assuming Every Offcut Is Reusable
Some offcuts cannot be reused because of size, joint direction or layout requirements.
5. Not Keeping Spare Material
Finding an exact colour and batch match several years later may be difficult.
Whole-Home Example
Imagine the flooring areas in a Melbourne home are:
| Area | Floor Area |
|---|---|
| Living / Dining | 42m² |
| Kitchen | 14m² |
| Hallway | 8m² |
| Bedroom 1 | 13m² |
| Bedroom 2 | 12m² |
| Bedroom 3 | 11m² |
| Total | 100m² |
With a 10% allowance:
100 × 1.10 = 110m²
If each box covers 2.2m²:
110 ÷ 2.2 = 50 boxes
If you choose to keep one additional box for future repairs:
51 boxes = 112.2m²
Measured area: 100m²
10% allowance: +10m²
Installation quantity: 110m²
Optional spare carton: +2.2m²
Total purchased: 112.2m²
What Waste Allowance Should You Use?
| Project Type | Practical Starting Allowance |
|---|---|
| Simple rectangular room | Around 5% |
| Typical residential project | Around 7–10% |
| Multiple rooms / complex layout | Around 10%+ |
| Diagonal installation | Around 10–15%+ |
| Herringbone / specialised pattern | Calculate specifically |
These are planning guides rather than fixed rules.
The correct amount depends on:
- Room layout
- Plank dimensions
- Installation direction
- Pattern
- Installer experience
- Product requirements
Our Verdict: How Much Flooring Should You Order?
For many standard residential projects, 5–10% extra flooring is a useful starting point.
Simple rectangular rooms may require closer to 5%.
Whole-home projects with hallways, multiple rooms and more cuts often justify something closer to 10%.
Specialised patterns may need considerably more.
But the percentage is only part of the calculation.
The best approach is to:
- Measure every flooring area accurately.
- Choose a waste allowance appropriate to the layout.
- Calculate the total square metres.
- Divide by the carton coverage.
- Round up to full boxes.
- Consider keeping spare boards for future repairs.
Click Floor Verdict: Don’t simply order the measured square metres and hope for the best. Measure accurately, allow for the real layout, round up to complete boxes and keep matching spare material where practical.
For many standard Melbourne projects, around 10% is a sensible starting point, but the right allowance depends on the actual installation.
Frequently Asked Questions
How much extra flooring should I order?
For many standard residential installations, allow around 5–10% extra.
More complex layouts and specialised patterns may require a higher allowance.
Is 10% waste enough for flooring?
Often, yes.
For many standard residential projects, 10% provides a useful margin for cuts and offcuts.
However, complex or decorative layouts may need more.
How do I calculate flooring with 10% waste?
Multiply the measured floor area by 1.10.
For example:
80m² × 1.10 = 88m²
Then divide by the square metres covered by each box and round up to a full carton.
Is 5% flooring waste enough?
It can be for a simple rectangular room with minimal cuts.
For larger or more complicated projects, a higher allowance may be safer.
Should I keep spare flooring?
If possible, yes.
Keeping spare boards from the original batch can make future repairs much easier if the range is later discontinued or changes slightly.
How many boxes of flooring do I need?
Calculate the flooring area including waste, divide by the coverage per box and round up to the next complete carton.
Should I include wardrobes in the floor measurement?
Yes, if flooring will be installed inside them.
Only exclude areas where flooring will genuinely not be installed.
Not Sure How Much Flooring You Need?
At Click Floor, we help Melbourne homeowners, renovators, builders and property investors work out the right flooring quantity before ordering.
The correct amount depends on more than just the room size — layout, installation direction, waste allowance, carton coverage and future repair requirements all matter.
Whether you’re flooring one room or an entire home, our team can help you calculate the quantity and choose suitable hybrid flooring or laminate flooring for your project.
