Tile size is one of those decisions that feels straightforward until you're standing in a showroom surrounded with samples and suddenly second-guessing everything. The truth is, tile sizing affects far more than just aesthetics. Get it right and your space looks considered, larger and easier to live with. Get it wrong and even expensive tiles can make a room feel busy, cramped or just slightly off.
This guide walks through every main room in the home — bathroom, kitchen, living area, laundry and outdoor — and explains which tile sizes tend to work best, and why.
Why Tile Size Matters More Than You Think
Before diving room by room, it helps to understand the two things that tile size actually influences: visual scale and grout line frequency. Larger tiles mean fewer grout lines, which creates a cleaner, more seamless look and less ongoing maintenance. Smaller tiles mean more grout lines, which adds visual texture and pattern but can make cleaning harder and small spaces feel busier.
Room size is an obvious factor, but it is not the only one. Ceiling height, natural light, the direction of the lay and your chosen grout colour all interact with tile size to shape how a finished room reads. A 600x600mm tile in a compact bathroom does not automatically make it feel small — placed well, it can actually make the room feel more open. Context matters more than rules.
Bathroom: Go Larger Than You Think
The bathroom is where most people overthink tile sizing. The common instinct is to choose smaller tiles in a smaller space, but the opposite is usually true.
Floor tiles: 300x300mm used to be the bathroom floor standard, and it still works in very compact ensuite bathrooms. But for most Melbourne bathrooms, 450x450mm or 600x600mm has become the preferred floor size, reducing grout lines and giving the floor a cleaner, more contemporary look.
Shower walls: This is where large-format tile really earns its place. 600x1200mm and 600x900mm formats are increasingly popular for shower walls, creating a near-seamless surface with minimal grout that is easier to clean and looks significantly more premium. If you are considering a floor-to-ceiling feature wall, even larger slab-style porcelain (1200x2400mm) is now available and frequently used in renovation projects across Melbourne.
Feature walls and niches: This is where smaller or mosaic tiles (50x50mm to 100x100mm) genuinely shine. A mosaic or zellige-style tile in a niche or on a single feature wall adds texture and visual interest without overwhelming the space.
One important note on bathroom tiling: waterproofing behind the tiles must comply with Australian Standard AS 3740, which sets out the minimum requirements for wet areas in residential buildings. The Victorian Building Authority (https://www.bpc.vic.gov.au/) provides guidance on what this means in practice — the key point for homeowners is to make sure any tiler working on wet areas is licensed and familiar with these requirements, because the tile itself is only as good as the waterproofing underneath.
Kitchen: Balance Function and Scale
The kitchen has two distinct tiling zones — the floor and the splashback — and they call for very different approaches.
Kitchen floors: Open-plan kitchens that flow into dining or living areas benefit from a consistent tile running through the whole space. In this case, 600x600mm or 600x1200mm tiles avoid the fragmented look of multiple floor breaks. In more defined kitchen-only spaces, 400x400mm or 450x450mm formats work well and are more forgiving with falls to drainage.
Splashbacks: The splashback is where personality comes in. Subway tiles in the classic 75x150mm or 100x200mm format remain reliable and genuinely versatile. Longer, more rectangular formats — 65x250mm "brickwork" or 100x300mm — are popular in 2026 for a slightly more contemporary feel. And for those who want a real statement, a single large-format slab splashback with no grout lines at all is increasingly achievable with porcelain and sintered stone products.
For kitchen floors in particular, slip resistance matters — especially around the sink and cooking areas. Check the slip resistance rating (the R-rating or P-rating) on any tile before buying for a kitchen floor.
Living Areas and Hallways: Think Long and Wide
In open-plan living spaces and hallways, tile size should be proportional to the room. For large open-plan areas, anything under 600x600mm can look dated and will multiply the grout lines across a big surface area. 600x600mm remains a solid all-rounder, but 600x1200mm laid in a brick pattern or stacked bond is increasingly the choice for contemporary Melbourne homes, particularly in new builds and renovations.
Hallways are a special case. Narrow hallways benefit from tiles laid diagonally or in a herringbone or chevron pattern, which draws the eye lengthways and makes the corridor feel wider. The tile size for this use case tends to be slightly smaller — 300x600mm or 400x400mm — because larger tiles can look awkward when cut repeatedly at the walls of a narrow space.
Laundry: Practical First, Then Style
The laundry is often the room where tile budget ends up being stretched thin, but it is worth getting right because it is a genuine wet area. A mid-sized format — 300x300mm to 450x450mm — is practical for laundry floors because it handles the floor falls required for drainage without excessive cutting, and grout lines actually help with slip resistance underfoot.
For laundry walls, a simple field tile in 300x600mm or subway-format keeps the look clean without being overdesigned. Save the feature tile budget for the bathroom.
Outdoor Areas: Safety and Scale
Outdoor tiles work differently to indoor tiles. Slip resistance becomes non-negotiable — R11 or above is the generally recommended rating for outdoor residential use — and larger tiles mean fewer grout lines for weeds to grow into, which is worth considering for paving areas.
For outdoor entertaining areas and alfresco spaces, 600x600mm is a practical and popular format. For pool surrounds and outdoor stairs, mosaic or smaller non-slip tiles (200x200mm and under) are often more appropriate because they follow curved or changing surfaces more easily and provide better grip.
Common Mistakes to Avoid
Using small tiles throughout: Small tiles in every room creates visual noise. Reserve them for specific feature uses and let the main floor and wall tiles breathe.
Matching floor and wall tile size exactly: Some contrast in scale between floor and wall tiles usually creates a more considered result. A large-format floor tile paired with a medium-format wall tile is a well-tested combination.
Not accounting for cuts: In awkward rooms with lots of angles, very large tiles result in lots of wasteful cuts and an uneven layout. Discuss your room dimensions with your tiler before committing to a size.
Ignoring grout width: Grout joint size should suit the tile format. Rectified tiles (precision-cut edges) allow for very fine 1.5–2mm joints. Non-rectified tiles need wider joints to account for variation. The grout colour you choose will also significantly change how the finished tile installation reads.
Finding the Right Tile for Your Melbourne Home
Choosing tile size is easier when you can see samples at scale and talk through your specific rooms with someone who has seen these decisions play out in real Melbourne homes. The team at Joshua Tiles, Melbourne's tile, flooring and bathware specialists with over 30 years of experience and showroom in Keysborough, can help you work through the right format, finish and layout for every room in your renovation — whether you are just starting to plan or ready to buy.