BuildBatch

How many tiles for a 2 x 2.5 m bathroom?

A 2 × 2.5 m bathroom, 2.4 m high, with one door, has 20.09 m² of wall, tiled to the ceiling, and needs 22.1 m² of tile with 10% extra for cuts: 23 boxes of 1 m² (23 m²), with 0.9 m² left over. The box size and the allowance are generic example figures, not a product’s: use the square metres per box printed on your tiles.

This worked example tiles all four walls of one rectangular bathroom up to the ceiling. It takes the door off the wall area, counts the tiles in whole boxes with an allowance for cuts, and lists the adhesive, grout, waterproofing, trim and tools to buy or check.

Worked example · Updated 2 October 2026

How this example was made

It was worked out when this page was built, by the same room planner and formulas as the editable list. The room figures are round examples. Product coverage, pack and allowance figures are the planner’s labelled generic examples, not figures for a product.

AI tools drafted the page and automated tests compare its list with the planner. It has not been checked by a tradesperson or anyone outside the build. No price is shown or used.

The room and assumptions

Room: 2.5 m × 2 m, 2.4 m high; 1 door, 0 windows. Work: tiling the walls.

  • One rectangular room, 2.5 m × 2 m, 2.4 m high, measured in metres.
  • 1 door taken off the wall area; nothing is taken off the ceiling or the floor.
  • Wall tiles: 9 m round × 2.4 m to the ceiling = 21.6 m², less 1.509522 m² of doors and windows = 20.090478 m². Boxes by area, with 10% extra for cuts.
  • Every quantity is rounded once, at the end, up to whole packs. Working uses unrounded figures.
  • Wall tiles use generic example figures, not the figures of any product. Enter the figures from the tin or pack for a closer answer.

The shopping list

4 lines marked Need and 6 marked Check first. Lines that this job does not need are left out here; the full planner shows them too.

Check before using this list

  • Older paint can contain lead and textured coatings applied before 2000 can contain asbestos: do not sand or scrape a coating you are not sure about; get advice first.

Need

  • Wall tiles

    Need

    23 × 1 m² box (23 m²)

    Why?

    Walls: 20.09 m² to tile, to the ceiling, plus 10% for cuts, in boxes that cover 1 m² each.

    Working: Least left over among the pack options in this example (no prices to compare): 23 × 1 m² = 23 m², about 0.9 m² more than the 22.1 m² needed.

  • Tile spacers or levelling clips

    Need
    Why?

    To keep the joints even while the adhesive sets.

  • Notched trowel, tile cutter or wet saw, spirit level, grout float, sponge, bucket and mixing paddle

    Need
    Why?

    To spread the adhesive, cut and set the tiles level, and grout them.

  • Safety glasses, gloves and a dust mask

    Need
    Why?

    Cutting tiles throws sharp chips and dust; adhesive and grout are hard on the skin.

Check first

  • Wall tile adhesive

    Check first
    Why, and what to check

    For the walls: 20.09 m² to cover.

    Check: The bag says how many m² it covers for your tile size and trowel; enter that and it will be counted.

  • Wall tile grout

    Check first
    Why, and what to check

    For the walls: 20.09 m² to cover.

    Check: The bag says how many m² it covers for your tile size and joint width; enter that and it will be counted.

  • A flat, sound wall to tile on

    Check first
    Why, and what to check

    Tiles go on a flat, sound, dry wall: old wallpaper off, loose plaster made good, gloss paint sanded or scored.

    Check: The adhesive says what it will stick to, and whether plaster or plasterboard needs priming first. Heavy tiles may need the wall checked.

  • Waterproofing (tanking) round a shower or over a bath

    Check first
    Why, and what to check

    Grout and tiles are not waterproof: the wall behind a shower, or over a bath with a shower, is waterproofed before tiling.

    Check: Only where water hits the wall. The kit says how much area it covers.

  • Tile trim for the edges and corners

    Check first
    Why, and what to check

    For external corners, such as a window reveal or a boxing-in.

    Check: Sold in lengths: divide the length above by the length sold and round up. A round-edged tile can finish an edge without one.

  • Sanitary silicone sealant

    Check first
    Why, and what to check

    Where tiles meet a bath, shower tray, basin or worktop, and round the edge of a tiled floor: grout cracks there.

    Check: One tube usually does a bathroom; the tube says how far it goes.

Before you use it

  • Measure the walls, the ceiling height and the door again.
  • Use the square metres per box, the allowance for cuts and the adhesive and grout coverage from the tiles you choose.
  • Check that the walls are flat and sound, and whether a shower or bath needs waterproofing (tanking) before any tile goes on.

Built and checked with AI tools, not yet by a tradesperson or anyone outside the build. Estimates are arithmetic on your measurements and the figures shown with them: follow each product's own instructions.

Other room sizes: How many tiles do I need for a bathroom? A table by room size · All example shopping lists · How the estimates are worked out