A small bathroom doesn't have to feel cramped — the right tile choice can genuinely transform how spacious a room feels. Whether you're renovating a classic Kiwi villa bathroom or updating a compact ensuite, understanding how tile size, format, and layout affect perception is the key to getting a great result.
The Short Answer: Larger Tiles Generally Win
It might seem counterintuitive, but larger format tiles tend to make small bathrooms look bigger, not smaller. The reason is simple: fewer grout lines mean less visual interruption across the floor and walls. Your eye travels further without stopping, which creates a sense of openness and continuity.
As a general guide, tiles 300×600mm and larger (sometimes called large-format tiles) work well in compact bathrooms. Formats like 600×600mm, 600×1200mm, and even 800×800mm are increasingly popular in NZ bathrooms and are readily available at suppliers like Bunnings and Mitre 10.
That said, there are practical limits — very large tiles (over 900mm on any side) can be tricky to cut and lay in tight spaces, and may require a more experienced tiler to handle correctly.
Why Grout Lines Matter So Much
Grout lines are the real visual culprit in making a small bathroom feel busy. A floor covered in 100×100mm mosaic tiles has dozens of lines per square metre; a floor in 600×600mm tiles has just a handful. Choosing a grout colour close to your tile colour further reduces contrast and helps the floor or wall read as one continuous surface.
For wet areas, BRANZ recommends ensuring grout joints are appropriate for the tile format and substrate movement — don't go too narrow just for aesthetics, as this can lead to cracking over time.
Best Tile Formats for Small Bathrooms
| Tile Format | Effect | Best Used On |
|---|---|---|
| 600×600mm | Opens up floor space, minimal grout lines | Floors, feature walls |
| 300×600mm (portrait) | Adds height, great for walls | Walls, shower enclosures |
| 600×1200mm | Very contemporary, maximum openness | Floors and walls (larger rooms) |
| Subway (75×300mm) | Classic, adds length | Walls, splashbacks |
| Mosaic (under 100mm) | Adds texture but can feel busy | Shower floors, accents only |
Layout Direction Makes a Difference
How tiles are laid is just as important as their size:
- Horizontal brick/offset pattern on walls draws the eye sideways, making a narrow bathroom feel wider.
- Vertical stacking (portrait orientation) on walls adds perceived height — great for bathrooms with low ceilings.
- Diagonal layout on floors creates a dynamic effect that can make a small floor feel larger, though it does produce more offcuts and waste.
- Large tiles running continuously from floor to wall (with a coved or mitred edge) blur the boundary between surfaces and enhance the sense of space.
Colour and Finish Tips
Tile size works hand-in-hand with colour and finish:
- Light, neutral tones (whites, pale greys, soft stone) reflect light and open up a space.
- Matte finishes reduce glare in small spaces and are easier to keep looking clean.
- Rectified tiles (precision-cut edges) allow for very fine grout joints, which further reduces visual clutter.
- Avoid very dark tiles on all four walls and the floor simultaneously — this can feel cave-like in a small room.
Practical NZ Considerations
In New Zealand, bathroom tiling in wet areas must comply with NZS 4858 (Wet Areas in Buildings) and the NZ Building Code, particularly Clause E3 (Internal Moisture). This means the waterproofing membrane behind your tiles is just as critical as the tiles themselves.
For floors, always check the slip rating of your chosen tile. NZS 4586 sets out requirements for slip resistance — a tile that looks great but is dangerously slippery when wet is not suitable for bathroom floors. Your tiler or tile supplier can advise on the appropriate R-rating or P-rating for your situation.
If your bathroom renovation involves moving or adding plumbing fixtures, this is restricted work under the Plumbers, Gasfitters and Drainlayers Act and must be carried out by a licensed tradesperson registered with the PGDB. Similarly, any electrical work (such as adding heated towel rails wired into the wall, or heat lamps) must be done by a registered electrician — check the EWRB register.
When to Call a Professional
While an experienced DIYer can lay floor tiles in a dry area, wet area tiling (showers, around baths, and anywhere subject to regular water exposure) is best left to a qualified tiler. Incorrect waterproofing or tile installation in wet areas can lead to serious moisture damage, mould, and costly repairs — and may affect your home insurance.
A professional tiler will also ensure large-format tiles are laid on a flat, properly prepared substrate, which is critical to avoid lippage (uneven tile edges) and cracking. If you need a trusted local tiler, you can find qualified tradespeople on tradedirectory.co.nz.