There are 4 common bathroom basin sizes in Australia, which are measured by width.
The most common basin widths are
- 450 mm Basin: Ideal for small bathrooms or powder rooms.
- 600 mm Basin:Â Most commonly found in residential bathrooms.
- 900 mm Basin: Most suitable for large bathrooms.
- 1200 mm to 1800 mm Basins: Most commonly used for double basins in spacious bathrooms.
While width dimensions are uniform, dimensions such as depth and height will vary based on the design.
Standard Basin Depth:
The standard depth for a bath basin is approximately 450 mm, this size provides enough space for handwashing and bath essentials.
Slim basins are available at 350 mm depth for narrow or compact spaces.
Standard Basin Height:
The overall height of the basin, including the vanity, should be between 860 mm to 880 mm from the bathroom floor.
This height will suit most users; however, if you are a tall family, measure the height that will suit you best.
 
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3 Tips for Choosing the Right Wash Basin Size
1. Measure your space to ensure the basin fits comfortably within the available area without obstructing movement. This includes the width and length of the bathroom itself and take into account other bathroom amenities such as the toilet, the position of the bath and any cabinetry.
2. Consider what it is going to be most used for. Family bathrooms usually require larger basins or double basins due to high usage while guest bathrooms or powder rooms may only need smaller sized basins.
3. Style and functionality play a key factor in choosing your basin. Slimline designs are ideal for smaller bathrooms, while wider, deeper basins suit more luxurious spaces.
By understanding the use of each bathroom and the space available to you, choosing the perfect size basin will less of a challenge. Measuring the space available in the bathroom and accounting for the space other amenities need will ensure a functional yet roomy bathroom.
