Large-format tile has become the default aspiration for bathrooms and kitchens in Central London. The appeal is obvious: fewer grout lines, a quieter surface, a sense of scale that makes a small room read as less cluttered. It photographs beautifully, which is most of why it is everywhere.
It is also the finish that most reliably exposes the building it is fixed to. Everything a period flat naturally has — walls that lean, floors that dip, decks that flex, corners that are not square — is precisely what large tile refuses to tolerate. This is a good choice, frequently, but it is a specification decision with consequences, and it deserves to be made with the consequences in view rather than from a showroom board.
Why a big tile is harder than a small one
A small tile is a forgiving thing. It is short, so it only has to agree with the background over a short distance, and each grout joint is a small opportunity to correct. Lay enough small tiles across a wavy wall and the wall's undulation is quietly distributed across dozens of joints. Nobody sees it.
A large tile is rigid and long. It cannot follow a hollow; it bridges it. Where the background dips away, the tile stays straight and the adhesive bed has to make up the difference. Where the background bulges, the tile is pushed proud of its neighbours. That difference in height at the joint is lipping, and on a large tile with a narrow joint it catches the light along its whole length. In a room lit from one end, which describes most London bathrooms, raking light along a wall makes lipping the first thing anyone sees.
So the flatness tolerance required behind a large tile is substantially tighter than for a small one. This is the central fact, and everything below follows from it.
The background is the entire job
In a mansion-block flat in Marylebone or a converted terrace in Bayswater, the background is unlikely to be ready. Walls are lath and lime plaster, patched with gypsum, with a later stud somewhere and a boxing around a soil pipe. They lean. Two walls in the same room lean by different amounts. Corners are approximate.
Making that acceptable to large tile is not a coat of something. Depending on what is found, it means stripping back to a sound background, overboarding, battening and re-boarding to bring a leaning wall back to plumb, replacing failed plaster, or building out. This work is invisible in the finished room and can be a large share of the price. It is also the part that separates a quote that holds from one that moves.
There is a knock-on people rarely anticipate: bringing walls plumb and flat eats the room. In a compact bathroom, battening out two walls to correct a lean takes real centimetres out of an already tight space, and that can affect whether the bath still fits. Worth knowing before the tile is ordered rather than after.
Floors: flatness is only half of it
On a floor, large tile has a second problem that walls do not: movement.
Period flats have timber floors on joists, and those decks flex. Tile does not. A floor that gives underfoot puts the stress into the weakest point of a rigid surface, which is either the adhesive bond or the tile itself, and the result appears months later as cracked grout, a hollow-sounding tile, or a crack running across a slab of porcelain for no apparent reason.
Dealing with it properly means addressing the deck rather than the finish: checking and stiffening the floor, adding a suitable board, and considering an uncoupling layer so that small movement in the structure is not transmitted directly into the tile. Levelling is separate again, because a period floor commonly dips towards a load-bearing wall, and a large tile will show that dip as lipping just as a wall does. All of this sits below the finish and all of it costs money, which is the honest answer to why a large-format floor in a period flat is not a cheap operation. The wider picture is in our guide to tiling cost per square metre.
Weight is worth a thought too. Large porcelain, plus a thick adhesive bed, plus levelling, plus boarding, adds real load and real height. The height matters immediately: thresholds, door bottoms and the step into the room all have to still work.
Getting them into the flat
This is the part that gets underestimated, and it is specific to how people actually live here.
A large-format tile is heavy, awkward, and vulnerable in exactly the way that matters: it is strong once bonded to a wall and surprisingly fragile carried flat. They travel on edge, they usually take two people, and the bigger formats need care and often a frame or handling gear to move without cracking them.
Now put that in a Central London mansion block. The delivery arrives on a street with no parking, in a loading window if you are organised. It crosses a communal hall with a carpet that must be protected. It goes into a lift that must be booked with the porter, protected, and is possibly too small to take the tile flat or on edge — which is a question worth asking with a tape measure before the order is placed, not on delivery day. If the lift will not take them, they go up the stairs, around a half-landing, by hand. Our guide to porter access for mansion-block works covers how this is arranged.
Breakage is a real cost, not a theoretical one, and it is why sensible ordering includes proper allowance for waste and spares. Buy the spares at the outset from the same batch. Trying to match a large-format tile from a later batch, months on, is a lottery.
Cutting, in a flat, with neighbours
Large tile means wet cutting on a bridge saw or equivalent. That needs space, water and power, and it produces slurry, noise and mess.
In a house with a garden, this is a non-issue. On the fourth floor of an occupied block with no outside space, it is a genuine planning question: where does the saw go, how is the water managed, where does the slurry go, and how do you avoid it reaching a communal part or a drain it should not be in. It has to be contained, and containing it takes room and time.
Noise is the other half. Cutting is loud, and noisy work is commonly restricted to set hours in Westminster and under individual block rules — see our guide to working hours restrictions. A large-format job cannot simply run long days to catch up. It runs the hours it is allowed to run, and the programme reflects that.
Cuts themselves are less forgiving. A poor cut on a small tile is a small tile wasted. A poor cut on a large one is an expensive tile wasted and possibly a delay while another arrives. Holes for pipes and outlets in a large tile are worse: the tile is already in your hands with everything committed to it.
Setting out, and small rooms
The irony of large tile in a Central London flat is that the rooms are small. A compact bathroom may be only two or three tiles wide, which means the setting out is the design. There is nowhere to hide a bad decision.
Where the cuts land, which wall absorbs the error from a room that is not square, whether a joint runs into the middle of the bath, how the wall grid relates to the floor grid, whether a sliver of tile ends up in the sightline from the door — all of it is decided before anything is fixed, and none of it can be adjusted later. With small tile you can nudge. With large tile you commit.
The other small-room reality is penetrations. Fewer, bigger tiles means a higher proportion of the tiles in the room have something cut into them, and every one of those is a large tile carrying risk.
Movement joints and the perimeter
Rigid surfaces in buildings that move need somewhere to move. Perimeter joints at walls and thresholds, and joints where the tiling meets a different material or crosses a change in the structure, are not a detail to skip because they interrupt the look. Filling a perimeter with rigid grout instead of a flexible sealant is a common shortcut, and it is one of the reasons grout cracks along an edge a year later, which we cover in our guide to regrouting versus retiling a bathroom.
Consent and the flat below
If large-format tile is part of a bathroom refurbishment, the usual Central London constraints apply. Most leases require the freeholder's or managing agent's consent for alterations, sometimes as a formal licence, and floor build-ups and anything touching waste or soil pipes are commonly the sensitive areas — see our guide to freeholder consent for a bathroom refurbishment. Where a tiled floor changes the build-up in a flat with someone below, lease provisions about floors may be engaged as well, which is worth checking against our guide to floor noise rules in mansion blocks. Check your lease and confirm with your managing agent before ordering, because this is not the tile to buy on spec.
When it is the right choice
None of the above is an argument against large tile. It is an argument for going in informed. Large format is a genuinely good answer on a sound, prepared background, where the deck has been dealt with, where access has been checked with a tape measure, and where the budget recognises that most of the work is behind the finish. Done properly it is a beautiful surface and it lasts.
How we work with it
We check the background and the deck before we agree the tile, and we will tell you if what you have chosen is going to fight your building. We measure the lift. We plan the cutting and the waste rather than improvising on the day. Our tiling work starts from £55/m² and is confirmed by a fixed quote before we begin, with preparation shown separately so you can see what you are buying. Ask us before you order the tiles, not after.