How to lay carpet tiles

Inspired by a helpful YouTube guide. We based this walk-through on B&Q's "How to Lay Carpet Tiles", which covers the full process from room prep through to cutting borders neatly. Well worth a watch before you start — the bit about tile arrow direction alone is easy to miss in written instructions.

1. Prepare the subfloor

Carpet tiles need a flat, dry, clean base. Sweep or hoover thoroughly and fill any deep hollows with floor levelling compound. Bumps and dips underneath will telegraph through once you are walking on the tiles every day.

If the floor is concrete, check for damp before you lay anything. Carpet tiles trap moisture. A damp subfloor will ruin the adhesive and, eventually, the tiles. A moisture meter takes the guesswork out of it.

2. Find the centre of the room

Measure both pairs of opposite walls and snap chalk lines between the midpoints. Where the lines cross is your starting point. Starting from a corner looks sensible on paper but almost always leaves narrow, awkward slivers along two walls.

Dry-lay a row of tiles from the centre to the wall before you stick anything down. If the gap at the wall is less than half a tile wide, shift the chalk line slightly so both sides land on something more workable.

3. Check the tile arrows

Turn a few tiles over and look at the backing. Most carpet tiles have an arrow. You can lay them all pointing the same way for a consistent colour, or rotate them 90° in a quarter-turn pattern to hide wear and create a subtle chequerboard effect.

Decide before you start and stick with it. Mixing directions by accident — which happens more than you'd think — creates visible patches that look like two different carpets in the same room.

4. Apply adhesive to the centre

Use a proper carpet tile adhesive. A pressure-sensitive type allows tiles to be lifted and replaced later. A full-bond type is better if the tiles are staying put permanently. Spread with a notched trowel and let it go properly tacky before placing the first tile.

Work in manageable sections. Adhesive that skins over before you get to it will not grip reliably.

5. Lay the first tiles from the centre outwards

Place the first tile exactly on the chalk cross. Press firmly from the centre outwards to push out any air. Then work in quadrants rather than row by row — this keeps the pattern aligned from the middle and makes it easier to catch any drift before it compounds.

Butt tiles tightly together as you go. A gap between tiles will collect grit and look shabby within weeks.

6. Cut border tiles

Measure each border gap individually. Rooms are rarely perfectly square and the gaps vary from wall to wall. Place a loose tile directly on top of the last full tile, slide it to the wall, and mark where to cut using the overlap as your guide.

A sharp Stanley knife and a metal straight-edge will cut carpet tiles cleanly. Score firmly two or three times rather than trying to get through in one go. Blunt blades drag and fray the cut edge.

7. Cut around obstacles

Pipes, columns, hearths and doorframes all need careful templating. Make a paper template first, test it for fit, then transfer the shape to the tile. A jigsaw with a fine blade handles awkward curves that a straight knife cannot manage cleanly.

Take your time here. A badly cut tile around a radiator pipe is the first thing visitors notice. To be fair, a well-cut one is the first thing they do not.

8. Finish the edges and press everything down

At doorways, fit carpet tile trim or threshold strips to cover the cut edge and protect it from foot traffic. Exposed edges fray quickly without protection.

Once the whole floor is laid, press every tile down firmly, paying particular attention to joints and border cuts. A carpet roller, or simply walking methodically over each tile, beds them into the adhesive properly.

When to call a handyman

Call Richard if the subfloor needs levelling first, the room has awkward shapes or lots of obstacles, or you just want it done in a day. Laying carpet tiles is satisfying when the room is straightforward. When it is not, an extra pair of hands makes a real difference.