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Bathroom floors take more punishment than almost any other surface in the home. Splashes from the shower, damp towels, bare feet, cleaning sprays, dropped bottles and years of daily traffic all combine to test whatever you lay down. Tiles cope with this better than most alternatives because the surface itself is hard-wearing, water-resistant and simple to wipe clean.
That said, not every tile suits every bathroom. A beautiful wall tile can be a poor choice underfoot, and a cheap box of ceramics may not survive a busy family bathroom. The decisions that matter most are the material, the finish, the slip rating and how you handle the joints between tiles. Get those right and a tiled floor can last decades with very little fuss.
Both are clay-based, but they are made differently and behave differently underfoot. Porcelain is pressed more densely and fired at higher temperatures, which gives it a water absorption rate below 0.5 per cent. That makes it strong, stable and effectively impervious to bathroom moisture. It is the better choice for wet rooms, heavily used family bathrooms and anywhere the floor might get properly soaked.
Ceramic is softer and more absorbent, so it is usually cheaper and easier to cut. It performs perfectly well in a lightly used en-suite or cloakroom, but it chips more readily and can crack if the substrate flexes. If you are tiling over timber, porcelain with a flexible adhesive is the safer bet.
Look at the tile body as well as the face. A glazed tile with a red or white biscuit underneath will show chips clearly, whereas a full-body porcelain carries its colour all the way through and hides minor damage. Standard floor tiles are usually 8–10mm thick; anything thinner is likely intended for walls.
This is the detail people most often overlook, and it matters more than colour or pattern. Bare wet feet on a polished tile are genuinely dangerous, particularly for children and older family members.
Two rating systems are commonly quoted in the UK:
In practice, a matt or lightly textured finish is what you want. Polished and highly glazed tiles look lovely on walls but should stay off the floor. Also remember that slip resistance deteriorates if the surface is coated in soap scum or leftover cleaning product, so regular mopping with a diluted neutral cleaner keeps the rating doing its job.
Grout is where most bathroom floors begin to look tired. Cementitious grout is porous and will absorb dirt and moisture unless it is sealed, so plan to re-seal it once a year in a busy bathroom. Epoxy grout costs more and is fiddlier to apply, but it is far more stain-resistant and does not need sealing, which makes it a strong option for shower zones.
Think about joint width too. Larger tiles mean fewer joints to maintain, but very narrow 2mm gaps can be tricky to clean thoroughly. A 3mm joint is a good compromise. Whatever you choose, keep a spare box of tiles and a little grout stored away; matching a discontinued tile later is far harder than storing a few.
Tile feels cold underfoot, and in a British bathroom that chill is noticeable from October onwards. Electric underfloor heating is the simplest retrofit: a mat or loose cable laid over an insulated backer board, then tiled directly on top. Insulation boards are worth the extra cost because they push heat upwards instead of into the floor structure.
A typical installation runs at around 150–200 watts per square metre and is controlled by a thermostat with a timer. Set it to come on half an hour before you usually shower rather than leaving it running all day. The benefits go beyond comfort: a warm floor dries faster, which discourages mould in grout lines and keeps the room feeling fresher. If you are renovating anyway, a wet system connected to the central heating is more efficient to run, though it needs a greater floor build-up.
Most failed tiled floors fail because of what is underneath, not the tile itself. The substrate needs to be rigid, clean and flat to within about 3mm over a 2 metre straightedge. Over floorboards, screw down any movement and overlay with cement backer board before tiling. Use a flexible adhesive and always allow a small expansion gap at the perimeter, hidden by the skirting or silicone.
Plan your layout on paper first. Avoid slivers of cut tile at the doorway or beside the bath, and centre the pattern on the most visible sightline. Finally, check the height difference between the bathroom floor and the hallway; a slim transition strip looks far neater than a thick wooden threshold. Take your time over these practical points and the finished floor will look considered for years to come.
Interior Matters shares practical, down-to-earth guidance on uk home interiors and practical design inspiration for readers across the UK.
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