Large-format tiles (anything from 600×600 mm up to 600×1200 mm and beyond) can make a room look bigger, cleaner and more modern. They’re also not always the right call. Tile size is a practical decision, not just a style one — and there are a handful of situations where smaller tiles will give you a better finish, an easier install and a more forgiving floor over the long run. Here’s when we’d steer you away from going big.
Small rooms and tight bathrooms
The popular advice is that large tiles make small rooms feel bigger. That’s true up to a point. Drop a 600×1200 mm tile into a 1.5 x 2 metre powder room and you’ll spend half the floor cutting it down — every cut tile reads as a partial, the proportions feel off, and the eye registers a chopped-up layout rather than a clean run. As a rule of thumb, the longest tile dimension should be no more than about a third of the shortest wall. In compact ensuites and laundries, 300×600 mm or 450×450 mm sits more comfortably and you waste less material at the perimeter.
Uneven or out-of-flat substrates
This is the biggest one. Australian Standard AS 3958.1 calls for a substrate flat to within 3 mm in any 2 metre length for tiles over 300 mm, but in practice large-format tiles want even tighter than that — closer to 3 mm in 3 metres. Old slabs, screeded bathroom floors, and timber subfloors with any deflection will telegraph through a 600×1200 mm tile as lippage at every corner. You’ll either need to grind down high spots or self-level the floor before laying — neither of which is cheap. Smaller tiles flex around minor variation and forgive a substrate that isn’t dead flat, which is why renovators on older Sydney terraces workers’ cottages often default to 300×300 mm or 200×200 mm.
Rooms with lots of corners, niches or fixtures
Bathrooms with shower niches, vanities, toilet pans and floor wastes have a lot of cuts. Every cut on a large tile risks a crack or a visible flaw, and you’ll burn through tiles faster than you’d think — budget around 15 to 20% wastage rather than the usual 10%. Kitchens with islands, splashback returns and skirting details are similar. If your room layout is busy, smaller tiles cut cleanly around obstacles and let the tiler keep a consistent grout pattern. Worth checking the 3-4-5 rule for squaring a room before the first tile goes down — out-of-square walls are far more obvious with large tiles than small ones.
Wet areas and slip-resistance
Shower bases and pool surrounds are the classic case for smaller tiles, and it’s not just style. The grout joints between small mosaics or 100×100 mm tiles add micro-texture that improves grip underfoot, which matters when AS 4586 slip ratings come into play. Large tiles in a shower also make falls to the waste harder to build — you need either a linear drain with a single-plane fall, or you cut the large tile into wedges, which defeats the point. For shower floors specifically, mosaics on a mesh sheet are still the most reliable option.
Tall walls and small wall sections
For walls, scale matters too. A 600×1200 mm tile on a 2.4 metre wall can read as just two horizontal bands, which looks blocky rather than considered. On feature walls behind a vanity or in a powder room, a smaller tile (subway, hex, finger mosaic) gives you texture and proportion. Conversely, mixing tile sizes within the same room — say large tiles on the floor and a smaller format on a feature wall — usually works better than running 600×1200 mm everywhere.
Budget and install cost
Large tiles cost more per square metre to lay. They need a thicker bed of adhesive (typically a back-buttered C2TE-rated tile cement around 10 mm rather than 6 mm), often two people to handle, and a tiler who’s set up for them — suction cups, levelling clips and a wet saw that can cut full sheets cleanly. Expect tilers to charge a premium of around $15 to $25 per square metre on top of standard rates. We’ve broken down the full picture in our tiler rates per m2 in Australia guide. If the budget’s tight, a 300×600 mm tile in a similar finish gets you close to the look at meaningfully lower install cost.
High-traffic, high-maintenance areas
Open kitchens and entryways take a beating — dropped pans, dragged stools, sand walked in from the backyard. A chip on a 600×1200 mm tile is far more visible than the same chip on a 300×300 mm one, and replacing a single large tile mid-floor without disturbing surrounding tiles is genuinely difficult. If you want a hard surface in a busy household and are open to alternatives, hybrid or SPC vinyl is worth comparing — see our guide to the best flooring options for kitchens for the trade-offs.
The short version
Large tiles are excellent in open living areas, big bathrooms with flat slabs, and anywhere you want minimal grout lines. They’re the wrong choice in tight bathrooms, on uneven substrates, in shower bases, around busy layouts, or when budget rules out the extra prep and labour. If any of those apply to your project, ask your tiler about a 300×600 mm or 450×450 mm option in the same range — most large-format collections carry one, and you’ll usually end up with a better job for less money.
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