What the substrate has to be
Flatness tolerance tightens dramatically with tile size. On a 600x1200 tile, a small hump becomes lippage at the edge and a stress point in the middle.
Floors usually need self-levelling compound; walls often need re-boarding or dubbing out rather than tiling onto an uneven plaster face.
Rigidity matters as much as flatness - any deflection under a large tile concentrates stress in one place.
How they are installed differently
Solid bed coverage with back-buttering, using a large-format notched trowel, so there are no voids anywhere under the tile.
Levelling clip systems to control lippage while the adhesive cures, plus two people for handling on the larger sizes.
Slower setting-out. Cuts around a WC frame or a shower niche in a large tile are expensive to get wrong, so the layout is planned before anything is fixed.
Where the extra cost is worth it
Shower walls and feature walls, where a near-seamless surface is the entire point and grout lines would spoil it.
Small bathrooms, counter-intuitively, because fewer joints make the room feel larger.
It is less compelling on heavily interrupted walls full of niches, pipe boxing and windows, where cutting waste climbs quickly.
Frequently asked questions
Do large tiles cost more to fit?
Yes - more preparation, slower handling and higher cutting waste. The material price is only part of the difference.
Can large tiles go on a plasterboard wall?
Weight per square metre matters. On stud walls we usually recommend tile backer board, which also solves the waterproofing question.
Will I still see grout lines?
Yes, but far fewer. Matching the grout closely to the tile makes them almost disappear.
Can you use large format on a floor with underfloor heating?
Yes, with a flexible adhesive and grout, correct movement joints and a proper commissioning heat cycle.
Next step
We will assess substrate flatness at survey so the quote includes the preparation, not a surprise.
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