For a 72-inch double vanity—about 183 cm wide—compare one wide mirror with two smaller mirrors centred over the basins. A 140 or 160 cm-wide mirror is a practical starting point for a continuous reflection. For a pair, the basin centres and the gap between the mirrors matter as much as their individual widths.
Do not choose by vanity width alone. Measure side cabinets, wall lights, tap height and the usable wall area. A wider mirror creates a connected look, while two mirrors give each basin a defined place.
Compare three layouts on a 183 cm vanity
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| Layout | Simple width check | Best reason to choose it |
|---|---|---|
| One 140 cm-wide mirror | About 21.5 cm nominal margin per side when centred. | A wide reflection with more room for surrounding fittings. |
| One 160 cm-wide mirror | About 11.5 cm nominal margin per side when centred. | A fuller, continuous reflection across the furniture. |
| Two 60 cm-wide mirrors | 120 cm total mirror width; the remaining space is split between the centre gap and outer margins. | Separate reflections aligned with two basins. |
These calculations are design starting points, not mounting clearances. Use the actual measured vanity width and mirror frame dimensions. Estimate a mirror size for your double vanity using about 182.9 cm and the double-basin setting, then check the result against the real basin centres.
One broad reflection: 160 × 80 cm
160 × 80 cm extra-large dual-light mirror — £599. A generous continuous view for two routines, with front and rear illumination, dimming, three light colours and anti-fog. Check the height above taps and below nearby fittings; the full wall outline matters as much as width.
The same design also offers a 140 × 70 cm option — £299 when you want more visible space beside the mirror. Compare large bathroom mirrors if the room favours one connected focal point.
Two circular reflections: 60 cm each
60 cm round dual-light mirror — £128 each. Two create separate viewing areas with a softer outline than one large rectangle. Position each over its basin and measure the centre gap; a pair is two separate products, so select the quantity you need.
Round mirrors are widest at the middle and narrow towards the top and bottom. Check both the appearance and the usable reflection rather than imagining a 60 cm square. Browse round LED mirrors for other diameters and light styles.
A taller-looking pair: 50 × 70 cm ovals
50 × 70 cm oval dual-light mirror — £148 each. A pair leaves more horizontal room around the basins while drawing the eye upwards. Front and rear lighting, dimming and anti-fog keep the choice practical as well as decorative.
Prices and stock checked on 27 October 2026. Listed prices are before any checkout promotion.
Check height and the surrounding fittings
There is no fixed 30–40 inch height that suits every double vanity. Mark the lower and upper edges against the taps, splashback, ceiling and users’ eye levels. Allow access to controls and the space required to fit the brackets.
Side lights can favour a narrower mirror; built-in lighting changes the visual arrangement but does not eliminate the need for room lighting. Match finishes intentionally rather than assuming every metal must be identical—our mirror and tap finish guide has styling ideas.
One or two: make the final decision in the room
Choose one broad mirror for a continuous reflection and fewer visual divisions. Choose a pair for defined basin areas and more wall between shapes. Mark both options with tape, open nearby cabinets and check the view from each basin before ordering.
For other rooms in the home, see mirror sizing for a 30-inch vanity and cloakroom mirror sizing. Find the finish and lighting you want at LED Mirror World.