Why Accurate Measuring Matters More Than You Think

Ordering new flooring is one of the most satisfying moments in a home refresh, but it is also the point where small arithmetic errors become expensive ones. Under-order by a single box and you may find yourself waiting weeks for a matching batch; over-order by three and you have spent money that could have gone towards underlay, beading or a well-chosen wool runner. Getting the numbers right takes half an hour with a notepad, a tape measure and a willing helper, and it will save you both money and mild panic.

Before you start, clear the room as far as you reasonably can. Move furniture to one side, lift rugs, and remove anything that blocks the skirting boards. You are measuring the floor, not the clutter, and a clear run along each wall makes life considerably easier.

Start With the Basic Rectangle

For a simple rectangular room, measure the length and the width at their widest points, not where the carpet edge or an old piece of furniture happens to sit. Measure in metres and centimetres rather than in feet and inches, because flooring is sold in metric and converting later invites mistakes.

Take each measurement twice, once along each opposite wall. Older British homes are rarely perfectly square, and a difference of five centimetres between one end of a room and the other is entirely normal. If the two figures differ, always use the larger one. Then multiply length by width to get your square metre figure.

• Measure wall to wall, skirting board to skirting board, not from the edge of the existing floor covering.
• Write both readings down immediately, in metres, with a note of which wall they relate to.
• Round each measurement up to the nearest ten centimetres before you multiply.

Don't Forget the Alcoves and Odd Corners

Period properties are full of character, and character usually means chimney breasts, alcoves, bay windows and boxed-in pipework. The safest approach is to divide the room into rectangles: measure the main floor area first, then measure each recess, alcove or bay separately and add the figures together.

For a chimney breast, measure the alcove on each side as its own rectangle, including its depth. For a bay window, treat the straight central section as one rectangle and each angled return as another, measuring to the widest point of the curve. A useful trick is to sketch a rough plan of the room on paper and write each measurement directly on the sketch. It sounds old-fashioned, but nothing beats a drawing when you are standing in a shop trying to remember whether the alcove was 1.2 or 1.4 metres deep.

If your room has an awkward L-shape, split it into two clear rectangles, calculate each, then add them together. Never average the widths of an irregular room; that method produces a figure that is wrong in both directions.

Add Your Wastage Allowance

Once you have your total square metreage, add a wastage allowance. This covers cutting around door frames, matching a pattern repeat, and keeping a spare board or tile for future repairs.

• Straight lay, plain flooring: add 5 per cent.
• Diagonal or herringbone laying: add 10 to 15 per cent, as the cuts at each edge are considerably more wasteful.
• Patterned carpet or tile with a repeat: add 10 per cent, and check the repeat size before ordering.
• Rooms with many alcoves and angles: add 10 per cent regardless of laying pattern.

Also remember that most flooring is sold in fixed pack sizes covering a set number of square metres. Divide your total, including wastage, by the pack coverage and round up to the next whole pack. Two packs rather than one and a half is not waste; it is insurance.

Measure for Underlay, Beading and Accessories

Underlay is usually sold by the square metre or in rolls, and it should match your floor area before wastage, since it is laid edge to edge with minimal cutting. Order the same figure you calculated for the room itself.

For scotia beading or skirting, measure the total perimeter of the room, then add roughly 10 per cent for mitred corners and mistakes. Door bars and thresholds are counted individually, so note how many doorways the flooring passes through. If you are fitting a runner or stair carpet, measure each step individually rather than multiplying one step by the total, as treads and risers often vary slightly in an older house.

A Final Check Before You Order

Lay your notes out and read them back as though someone else had written them. Check that every measurement is in the same unit, that your alcoves have been added rather than forgotten, and that your wastage percentage is included in the final figure. Confirm the batch or dye lot with your supplier where possible, and ask them to hold the quote while you double-check the room one last time.

Ten minutes of careful checking at this stage protects both your budget and the elegant, considered finish you are working towards. Beautiful British interiors are built on quiet precision, and it begins underfoot.