What Size LED Bathroom Mirror Should You Choose? A New Zealand Vanity Guide
Quick answer: Start with the actual width of your vanity, the clear wall space above it and the look you want. A mirror close to the vanity width creates a clean, coordinated composition; a slightly narrower mirror reveals more wall around it. Neither approach is a universal rule. Choose the physical mirror dimensions, not just a size label, and check the product drawing before ordering.
The mirror is one of the most visible decisions in a bathroom. Your tiles, tapware and vanity set the scene; the shape and light of the mirror complete it. This New Zealand guide will help you compare sizes without guessing.
Measure the space before choosing a mirror
Record these four measurements:
- Vanity width: measure the actual cabinet or benchtop rather than relying on the nominal product name.
- Clear wall width: allow for adjacent cabinetry, window reveals, doors, lights and tiles.
- Available height: measure from the planned bottom of the mirror to the ceiling, bulkhead or another fixture.
- Services and fixings: consider the power connection, wall construction and the mounting requirements shown in the selected model's instructions.
If the mirror sits between two wall cabinets, the wall opening—not just the vanity—may be the decisive constraint. Check the space with the finished tile thickness in mind.
Choosing a mirror for a 600, 750 or 900mm vanity
600mm vanity: keep the composition intentional
A compact vanity often suits a portrait oval, a small round mirror or a proportionate rectangular design. The key is not to overwhelm the sink area. For example, the Mirror World Backlit Oval is available in 400 × 600mm and 600 × 800mm formats. Those are width × height measurements; the second size is considerably taller as well as wider.
750mm vanity: more flexibility
For a medium vanity you can choose a softly rounded form or a crisp rectangle. A portrait-style rectangle and a wide landscape rectangle produce very different visual results even when the numbers are similar. Check the orientation displayed on the product variant; 750 × 900mm is not interchangeable with 900 × 750mm.
900mm vanity: balanced statement piece
A round mirror can soften a room full of straight lines, while a rectangle can reinforce the architecture. Mirror World offers Round Radar backlit mirrors in 800, 900 and 1000mm diameters, with lighting that responds to presence when Radar mode is enabled. When comparing a round mirror against the vanity width, remember the diameter describes both width and height.
1200 and 1500mm vanities: look at the whole wall
Large vanities create room for a wider illuminated mirror. A Smart LED Mirror in 1200 × 800mm or 1500 × 800mm can span more of the vanity while keeping an 800mm height. Those Mirror World Smart models include Bluetooth audio, a time/temperature display, a demister, adjustable light colours and dimming. Check the current product page for availability by size.
A wide mirror is not always the right answer. A single centrally mounted round or arch shape can be a deliberate design choice on a larger wall; twin mirrors can also suit a double vanity, provided the overall layout and mounting services support that arrangement.
Shape changes the perceived proportions
- Round: softens angular basins, tiles and cabinetry. Explore round LED mirrors.
- Oval: adds a taller, elegant outline without visually dominating the room.
- Arch: introduces an architectural curve. See the Backlit Arch LED Mirror and its exact 600 × 1000mm specification.
- Rectangle: works well when you want a considered relationship with the vanity's horizontal lines. View a rectangular LED mirror.
Don't choose by dimensions alone: consider the lighting
A backlit mirror throws a soft glow towards the wall; front-facing illumination can serve a different purpose near the face. Neither automatically replaces all the other lighting in a bathroom. Read our Backlit vs Front-Lit comparison if you are deciding between those effects. Demisters, dimming and light-colour controls also vary by model.
Before you order: a practical NZ checklist
- Confirm whether the published size is width × height or a round diameter.
- Measure clearances and decide where the mirror will sit relative to taps and the basin.
- Read the exact variant specification, mounting details and product video where available.
- Plan electrical work according to the product instructions and relevant New Zealand requirements.
- Check the selected size's dispatch or pre-order information, rather than relying on a generic stock count.
Frequently asked questions
Should a bathroom mirror be the same width as the vanity?
It can be, but it does not have to be. Many designs look balanced with a mirror close to the vanity width, while a narrower mirror creates more surrounding space. Wall clearances and mirror shape matter just as much as the number.
Is a 900mm round mirror too big for a 900mm vanity?
Not automatically. Its diameter matches the vanity's nominal width, but you still need to verify the clear wall space, nearby fixtures and the actual installed composition.
Can I install an LED mirror myself?
Installation depends on the model and how it connects to power. Follow the manufacturer's instructions and use a suitably licensed electrician wherever the connection and local requirements call for one.
Explore related LED mirror buying guides
Smart Mirrors NZ: Radar vs Touch vs Bluetooth LED Bathroom Mirrors · Are LED Bathroom Mirrors Worth It? Pros, Cons and NZ Buying Advice
Find the shape that makes the room. Compare Mirror World's premium LED bathroom mirrors in New Zealand by design, size and features, then choose the model that suits your space.
