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The vanity decision
The vanity is the centre of the bathroom. It holds the basin, stores toiletries and sets the visual tone for the room. Choosing between a single and a double vanity is one of the biggest layout decisions in a renovation.
The answer depends on room size, who uses the bathroom, and how the plumbing is set up. A double vanity is not always better — and a single vanity is not always a compromise. Our vanity guide covers materials, mounting styles and sizing in detail.
When a double vanity works
A double vanity suits a bathroom used by two people at the same time — typically a master bathroom or ensuite. It reduces morning bottlenecks and gives each person their own basin, mirror space and storage.
You need at least 1,500 millimetres of wall width for a comfortable double vanity — 1,800 millimetres is better. Below that, the basins are too close together and the bench space between them is too small to be useful.
A double vanity also needs two sets of plumbing — hot and cold supply lines and two waste connections. If the existing plumbing has only one set, adding a second adds $500 to $1,500 to the cost.
When a single vanity is the smarter choice
In a bathroom under 5 square metres, a single vanity is usually the better option. It leaves more floor space for movement, towel rails and storage. A large single basin (600 to 900 millimetres) feels generous without crowding the room.
In a powder room or guest bathroom, a single vanity is standard. These rooms are used by one person at a time, so a second basin adds cost without adding function.
Our small bathroom guide covers other ways to make a compact room feel larger.
Cost difference
A quality single vanity (unit, basin, tapware, fitting) costs $1,500 to $4,000. A double vanity costs $2,500 to $7,000. The difference comes from the wider unit, the second basin and tapset, and the extra plumbing.
If your renovation is on a tight budget, a single vanity with a larger basin often gives a better result than a cramped double vanity where the basins are too small and too close together.
Storage comparison
A double vanity is wider, so it has more drawer and cupboard space underneath. But a single vanity frees up wall space for a tall boy, a medicine cabinet, or wall-mounted shelves — which can hold just as much.
The best approach is to list what needs to be stored (toiletries, cleaning products, spare towels, medications) and then decide which layout accommodates that list better. Our storage planning guide walks through this step by step.
How to decide
Measure the wall. If you have 1,800 millimetres or more and two people use the room at the same time, a double vanity is worth the extra cost. If the wall is under 1,500 millimetres or the room is used by one person at a time, a single vanity will serve you better.
Lachlan Conaty said: "They listened to what I wanted, offered great suggestions, and completed the project on time." The vanity is chosen during the design phase. A free on-site measure anywhere in Sydney is the starting point — call 0411 752 334.
Frequently asked questions
How wide does a bathroom need to be for a double vanity?
At least 1,500 millimetres of wall width, but 1,800 millimetres or more is best. Below 1,500 millimetres, the basins are too close and the bench space is not useful.
Does a double vanity add value to a home?
In a master bathroom or ensuite, yes — it is a feature buyers expect in mid-range to premium homes. In a small family bathroom or powder room, a well-chosen single vanity is a better use of space and money.
Can I retrofit a double vanity where a single was?
If the wall is wide enough and the plumbing can be extended, yes. The plumbing work (adding a second supply and waste connection) typically costs $500 to $1,500. The wall width is the main constraint.
What is the standard height for a bathroom vanity?
The standard height is 850 to 900 millimetres from the floor to the top of the bench. Wall-hung vanities can be mounted at any height to suit the user. Comfort height (900 millimetres) is becoming the new standard.
Should the vanity match the rest of the bathroom?
The vanity should complement the tiles, tapware and overall colour scheme. It does not need to match exactly, but it should feel like it belongs. A timber vanity in a room with cool grey tiles can look striking if the tones are balanced.