1. Start With the Room, Not the Vanity Photo

A vanity can look perfect online and still be wrong for your bathroom. Before choosing a size, measure the usable wall width, the door arc, the distance to the shower entry, and how much room you need in front of drawers and cupboards when they are open.

If your bathroom is compact, a slimmer vanity that leaves the room easy to move through will usually feel better than an oversized unit with extra storage. In practice, a bathroom that feels open is easier to clean, more comfortable to use and less likely to date badly after the renovation dust settles.

2. Which Vanity Size Fits Which Bathroom?

600mm to 750mm

Choose this range when the goal is simply to make the room work. It suits powder rooms, secondary bathrooms and narrow ensuites where every millimetre matters. You will get a functional basin and some storage, but not much relaxed bench space.

900mm

This is often the sweet spot. A 900mm vanity usually gives you enough top surface for daily use, enough storage for a normal routine and a footprint that still feels manageable in many standard Australian layouts. If you want one size that balances practicality and visual proportion, this is usually the first one to test on your plan.

1200mm

Step up to 1200mm when the bathroom is a shared zone and you want less clutter. You gain better drawer capacity, more landing space around the basin and a more premium look. It is a strong choice for a main bathroom, but only if the extra width does not pinch the walkway.

1500mm and above

This is where double-vanity planning becomes realistic. Go this wide when two people genuinely need the bathroom at the same time and the wall length supports it. If the room is not generous, a large vanity can make an expensive renovation feel cramped instead of luxurious.

3. Is a Double Vanity Actually Worth It?

A double vanity sounds like an automatic upgrade, but it only works well when the room still has comfortable circulation. If two people use the bathroom together most mornings, a double setup can be genuinely useful. If not, a well-planned single vanity with deep drawers is often the smarter choice.

• Choose a wider single vanity if you want easier cleaning, more uninterrupted bench space and a calmer look.
• Choose a double vanity if your routine involves two users at once and the room still feels open after both basins, mirrors and taps are added.
• Pause before ordering if the vanity width forces awkward towel placement, a narrow shower entry or a squeezed toilet zone.

4. Size Is Not Just Width: Depth, Height and Style Matter Too

Width gets most of the attention, but depth changes the room just as much. A deep vanity can make a narrow bathroom feel tighter than expected, especially when paired with a swing door. Height also matters for comfort, particularly if you are choosing a vessel basin or a wall-hung unit that gives you more flexibility over installation level.

Wall-hung vanities can help a smaller bathroom feel lighter because the floor remains visible underneath. Freestanding vanities can suit classic or family-focused layouts where maximum enclosed storage matters more than visual openness. The right choice depends on how you want the room to feel as much as how much you want to store.

5. Common Vanity Sizing Mistakes to Avoid

1. Measuring wall width but forgetting the door swing or shower screen.
2. Choosing a double vanity before checking whether two people can actually stand there comfortably.
3. Ignoring drawer clearance, especially beside toilets or towel rails.
4. Assuming all 900mm or 1200mm vanities have the same basin position, storage layout or usable top space.
5. Ordering the vanity before confirming plumbing points, mirror size and tap configuration.

The best vanity size is the one that fits the room twice: once on the plan, and once in everyday life.

Final Takeaway

If you are still deciding, start by testing 750mm, 900mm and 1200mm on your layout before looking at finishes or drawer styles. That usually tells you very quickly whether the room needs a compact solution, a balanced everyday setup or a larger vanity with more storage.

Planning a renovation or replacing an old unit? Choose the vanity size first, then match the basin, mirror and tapware around it. That order usually leads to a bathroom that feels better to use and easier to live with over time.