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300x450mm tiles are one of the most commonly specified wall tile formats in Australian bathrooms, laundries and ensuite renovations. At 30 centimetres wide by 45 centimetres tall, the format sits between compact mosaic sheets and large-format slabs, making it straightforward to install in standard-height wet areas. This collection brings together 300x450mm tiles across ceramic, porcelain and stone-look finishes available with AU-wide delivery.
What spaces suit 300x450mm wall tiles?
The 300x450mm format works well in bathrooms, ensuites, laundries and shower recesses where wall height runs between 2,100mm and 2,400mm. Three tiles stacked vertically reach 1,350mm, so the format divides cleanly into standard wet-area heights with minimal cut tiles at the top row. It also suits splashbacks and feature alcoves where a larger format would feel oversized.
Can 300x450mm tiles be used on floors?
This format is specified almost exclusively for walls. The rectangular profile has no slip-resistance rating for wet floor use, and the surface finish on most 300x450mm tiles does not meet the R10 or R11 rating required for bathroom floors under AS 4586. For matching floor tiles, a 300x300mm or 600x300mm porcelain with the same colour body is a common pairing. Browse the broader tiles collection to find coordinating floor formats.
What finishes are available in 300x450mm?
Gloss white and off-white ceramics make up the largest share of 300x450mm stock because they reflect light in smaller wet areas. Matte and satin finishes in grey, sage, charcoal and warm stone tones are increasingly common and hide water marks better than high-gloss surfaces. Textured and embossed surfaces add visual interest on feature walls without the complexity of a mosaic layout. Stone-look porcelain in this format mimics travertine and marble with less maintenance than natural stone.
How do laying patterns affect the result?
A stacked vertical pattern (tile height running floor to ceiling) draws the eye upward and suits narrow shower bays. A horizontal brick-bond offset at 50 percent is the most common installation because it distributes grout joints evenly and reduces lippage risk. A 33 percent offset gives a more contemporary look and is sometimes specified for feature walls. Diagonal layouts are possible but increase off-cut waste significantly for a rectangular format.
What grout joint width should I use?
A 2mm to 3mm joint is standard for rectified 300x450mm tiles, which are cut to tight dimensional tolerances. Non-rectified tiles typically need a 3mm to 5mm joint to allow for size variation between pieces. Unsanded grout is recommended for joints under 3mm. Epoxy grout is worth considering in shower recesses because it resists mould without sealing. Your tiler should check the manufacturer's stated tolerance before specifying joint width.
How many tiles do I need for a bathroom?
A single 300x450mm tile covers 0.135 square metres. To tile a shower recess measuring 900mm wide by 2,100mm high on three walls, you need roughly 9.45 square metres, or approximately 70 tiles before waste. Add 10 percent to 15 percent for cuts and breakage on a standard layout; add up to 20 percent for diagonal or complex patterns. Measure each surface separately and round up to the nearest box quantity to avoid batch and dye-lot variation.
What materials are stocked in this format?
Ceramic tiles in this size are the most affordable option, typically ranging from $25 to $60 per square metre. Porcelain tiles offer higher density and lower water absorption (often below 0.5 percent), making them the preferred choice for shower walls. Stone-look and concrete-look porcelain in 300x450mm spans a mid-to-upper price range. For coordinating bathroom products, see the bathroom vanities and tapware collections, or explore bathroom mirrors to complete the space.
Frequently Asked Questions
What is 300x450mm in tiles?
300x450mm refers to the face dimensions of a tile: 300 millimetres wide and 450 millimetres tall. It is a common wall tile format in Australia, particularly for bathroom and ensuite wet areas, because three tiles stacked vertically reach 1,350mm, which divides cleanly into standard 2,100mm to 2,400mm wall heights.
Are 300x450mm tiles suitable for shower walls?
Yes. Porcelain and ceramic 300x450mm tiles are widely used on shower walls. Porcelain is preferred because its water absorption rate is typically below 0.5 percent. Rectified versions allow tight 2mm grout joints that are easier to keep clean. Ensure tiles are installed with appropriate waterproofing membrane behind them as required by AS 3740.
What is the difference between rectified and non-rectified 300x450mm tiles?
Rectified tiles are machine-cut after firing to precise dimensions, allowing grout joints as narrow as 2mm and near-seamless wall finishes. Non-rectified tiles have natural size variation of up to 1mm to 2mm per piece and require wider joints of 3mm to 5mm. Rectified tiles cost slightly more but are the standard for contemporary bathroom installations.
How much does it cost to tile a bathroom with 300x450mm tiles in Australia?
Tile supply for a standard bathroom of 8 to 10 square metres of wall area typically costs $200 to $600 for ceramic, or $400 to $1,000 for porcelain, depending on finish and brand. Tiling labour in Australia averages $45 to $80 per square metre. Total installed cost for a mid-range project commonly falls between $900 and $2,500 for wall tiles only.
What colour grout works with white 300x450mm bathroom tiles?
White or light grey unsanded grout is the most common pairing with white 300x450mm tiles because it makes joints less visible and keeps the wall looking uniform. Mid-tone grey grout adds subtle contrast and is more forgiving to maintain. Dark grout creates a graphic grid effect but shows soap residue more readily and requires more frequent cleaning.
