How to Choose the Right Basin Size for Your Bathroom

The wrong basin size makes a bathroom feel cramped or leaves awkward gaps. Here's a step-by-step approach to measuring your space and choosing dimensions that feel right.

Step 1: Measure the Available Wall Space

Measure the wall where the vanity will sit, from obstacle to obstacle (walls, door frames, shower screens, towel rails). This is your maximum width.

Now subtract 0.79–1.18 in from each side. This gives you a clean visual margin — the vanity won't look crammed against adjacent surfaces. The result is your target width.

With a custom unit, you can work to any width between 700 and 94.49 in. No gaps, no filler panels.

Step 2: Decide on Depth

Depth is measured from the wall to the front edge of the vanity. Standard depths range from 400 to 25.59 in.

• 15.75–17.72 in: Compact. Good for en-suites, cloakrooms, or narrow bathrooms where you need to preserve floor space. You'll still get a usable bowl, but the flat surround will be minimal.
• 19.69–21.65 in: The sweet spot for most bathrooms. Enough depth for a generous bowl with a comfortable flat surround on all sides.
• 23.62–25.59 in: Generous. Best for larger bathrooms where the vanity is a focal point. Gives you space for wider bowls and more countertop area.

Make sure the vanity doesn't project so far that it blocks the door swing, toilet access, or the path through the room. Leave at least 23.62 in of clear floor space in front of the vanity for comfortable use.

Step 3: Choose Your Bowl Size

The bowl needs to be proportionate to the vanity. Too small and it looks lost; too large and you lose usable counter space. Here's a guide based on vanity width:

• 27.56–35.43 in vanity: A 18.11 × 13.39 in bowl works well. It's compact but functional, leaving enough flat surround for soap and a toothbrush holder.
• 35.43–47.24 in vanity: A 21.65 × 11.02 in or 21.65 × 12.6 in bowl balances well. The extra width around the bowl gives you usable counter space.
• 47.24–62.99 in vanity: A 22.44 × 14.17 in bowl gives generous proportions. Or position a 21.65 in bowl off-centre (left or right) to create a larger prep area on one side.
• 62.99–94.49 in vanity: Consider two bowls for a double vanity. Two 21.65 × 11.02 in bowls keep proportions balanced. A single 26.77 × 14.17 in bowl also works if one basin is enough.

Step 4: Think About Bowl Position

Center-mounted bowls look balanced and suit symmetrical bathrooms. But off-centre bowls (left or right) can be more practical:

• Place the bowl on the tap side if plumbing is off-centre — it simplifies installation.
• Place it away from the wall in a corner installation to maximise the usable counter area.
• Match it to your dominant hand — a right-handed person often prefers the bowl on the left, keeping the right side free for products.

Step 5: Use the Configurator

The fastest way to see how different sizes look in proportion is to use our online configurator. Set your width, depth, bowl size, and position — the live preview updates in real time so you can see exactly what you're getting before requesting a quote.

If none of our five standard bowl sizes suit your space, describe your ideal dimensions in the quote form. We can design a custom bowl size to fit.

Quick Reference

For a typical main bathroom (39.37–47.24 in vanity, 19.69 in depth):

• Bowl: 21.65 × 12.6 in, centered
• Material: sintered stone — non-porous, no sealing needed
• Edge profile: chamfered or rounded for a softer look

For a compact en-suite (27.56–31.5 in vanity, 15.75–17.72 in depth):

• Bowl: 18.11 × 13.39 in, centered
• Depth: keep it to 16.54–17.72 in to preserve floor space
• Skip the mirror cabinet if wall space is tight