What Size Mirror Should You Put Above a Bathroom Vanity in Australia?

For most Australian bathrooms, the safest starting point is a mirror that looks intentionally tied to the vanity rather than oversized or undersized. In practice, that usually means keeping the mirror a little narrower than the vanity, with round and arched mirrors often sized smaller than rectangular ones.

If you are renovating, do not choose the mirror last. Mirror width affects how balanced the vanity wall feels, how useful the reflection is, whether lighting lands in the right place, and whether a mirror cabinet may make more sense than a plain mirror.

Start with vanity width, not mirror shape

The vanity is the anchor on the wall, so the mirror should relate to that footprint first. A mirror that is much narrower than the vanity can make the wall feel unfinished. A mirror that extends well past the vanity edges can look top-heavy unless the whole wall has been designed around it.

As a rule of thumb, rectangular mirrors can sit closer to vanity width, while round mirrors usually need more breathing room at the sides. Double vanities are a separate decision again: sometimes one wide mirror is the cleanest option, and sometimes two mirrors create better symmetry.

These are practical starting points, not hard rules. Always check tap location, wall lights, power points, splashback height and the real width of the vanity top before ordering.

How shape changes the right size

A rectangular mirror gives you the most usable reflection for its width, so it usually suits family bathrooms, narrower rooms and double-bowl vanities. It also works well when you want a calm, architectural look.

A round or arched mirror softens the space, but because the widest point is only through the middle, it generally needs careful sizing. Too small and it can feel decorative rather than practical. Too large and it can compete with wall lights, tall tapware or a bulky basin shape.

• Choose rectangular when function, shared use and visual width matter most.
• Choose round or arched when you want a softer look and the vanity is not already visually busy.
• Choose two mirrors over a double vanity when each basin needs its own visual zone.

Get the height and placement right

Good mirror placement is not just about a number from the floor. It should work with the vanity height, the basin depth, the tap position, the splashback and the main users of the room. In most bathrooms, the mirror looks best when it feels visually connected to the vanity instead of floating too high above it.

A practical approach is to centre the mirror to the basin or vanity, keep enough clearance above the splashback or tapware to reduce constant water spotting, and make sure the reflected face area lands at a comfortable height for everyday grooming. If you are adding wall lights, decide the lighting position before you lock in the mirror size.

1. Measure the vanity width first.
2. Mark the tapware, splashback and lighting positions.
3. Check the mirror against the actual user eye line, not just the tile grid.
4. Stand back and confirm the mirror relates to the vanity, not just the empty wall around it.

When a mirror cabinet is the smarter choice

A flat mirror is not automatically the best option. In many Australian bathrooms, especially ensuites and compact family bathrooms, a mirror cabinet solves storage pressure better than simply going wider on the vanity.

If bench clutter is already a problem, a shaving cabinet or recessed mirror cabinet can be more useful than a feature mirror. It may project a little farther into the room, but the storage gain can be worth it. This is especially true when you do not want every daily-use item sitting beside the basin.

• Choose a flat mirror when you already have enough storage and want the lightest visual look.
• Choose a mirror cabinet when toiletries, medicines and chargers are fighting for vanity space.
• Choose recessed cabinetry when you want storage without the full bulk of a surface-mounted cabinet.

Common mistakes that make the vanity wall feel off

• Picking the mirror by style photo alone and only checking width after the vanity is installed.
• Choosing a round mirror that is too small for the vanity and calling it a feature.
• Running the mirror past the vanity edges without planning the rest of the wall composition.
• Forgetting to coordinate mirror size with wall lights, LED strips or power points.
• Ignoring storage needs and then relying on the vanity top to hold everything.

The best bathroom mirror size is the one that fits the whole wall

If you want one practical takeaway, make the mirror feel proportionate to the vanity first, then fine-tune for shape, storage and lighting. That approach is more reliable than copying a showroom look or chasing one fixed sizing formula.

For most Australian renovations, a mirror that is clearly tied to the vanity width, sits at a usable grooming height, and supports the way you actually store bathroom items will age better than a mirror chosen only for trend appeal.