How to Choose a Mirror: Size, Placement and Interior Style
A mirror works best when its size, reflection and frame are considered together. Before buying, check what it will reflect from the doorway and your usual seat, measure the wall and furniture beneath it, and confirm its weight, fixing method and suitability for the room.
Practical advice from Illuminations of Camberley, an independent decorative lighting retailer. Published 4 October 2026. The proportions below are design starting points, not installation standards.
How does a mirror work in an interior scheme?
A mirror adds a second view to a room. It can repeat a favourite lamp, artwork or architectural detail, introduce a curved shape among straight furniture, and connect finishes across the scheme. It also repeats clutter, exposed bulbs and awkward sightlines, so the reflection deserves as much attention as the frame.
A flat mirror reflects existing light and forms a virtual image: objects appear as far behind its surface as they are in front. This optical effect helps explain the impression of depth. A mirror does not create extra light or increase a room’s physical size. The practical result depends on its position, the available light and the view it reflects. [1]
1. Decide what you want the mirror to do
For a hallway, prioritise a useful view before leaving home and enough clearance around doors. In a living room, decide whether the mirror should be the focal point or support an existing fireplace or artwork. In a bedroom, a dressing mirror needs a comfortable standing position; a decorative mirror over a chest may serve a different purpose.
For a dining room, check the reflection at seated eye level. A pendant that looks beautiful from the doorway can produce an uncomfortable reflection from the table. Make this check with the lights on as well as in daylight.
2. Choose the size using the whole wall
Measure the mirror’s overall frame width, height and depth, not just the glass. A wide decorative frame can leave much less usable reflective area than you expect. Check nearby switches, sockets, wall lights, cornices and door swings before deciding on a size.
As a visual starting point, try a mirror around two-thirds to three-quarters the width of the console or sideboard beneath it. For a 120cm console, that means testing roughly 80–90cm overall width. This is our styling suggestion, not a rule: a substantial frame, a narrow wall or a deliberately oversized scheme can call for different proportions.
Mark the outline with low-tack tape suitable for your wall finish, or use a paper template. Look from the entrance and from the main seating position. Leave enough space above furniture for lamps and objects without obscuring the useful reflection. There is no single hanging height that works for every mirror or household.
3. Check the reflection before choosing the position
Ask someone to hold a small mirror safely at the proposed position, or assess the sightline with a temporary template. Look for a pleasing view of the room rather than simply filling an empty wall. A mirror beside a window may give a more useful reflection than one directly opposite it.
Check for glare from exposed lamps and changing sunlight. London Fire Brigade advises keeping mirrors and other reflective objects out of direct sunlight because reflected or concentrated sunlight can cause fires. Plan the position with the sun’s movement in mind, especially for shaving and magnifying mirrors. [2]
4. Coordinate shape and frame with the room
Round and oval mirrors can soften a scheme dominated by rectangular furniture. A rectangular mirror can echo a console or reinforce architectural lines. An arched mirror draws attention upwards, while an irregular outline becomes a stronger decorative feature. Choose the shape for the wall and reflection you need, rather than the trend alone.
Repeat one or two existing details: a warm metal frame with a lamp base, timber with joinery, or a dark frame with window fittings. Exact matching is optional. Compare warm and cool undertones in daylight and under your evening lighting. A photograph rarely tells you everything about texture, bevel depth or the sheen of a finish.
Antiqued, tinted and heavily patterned mirrors are decorative choices. Check whether the altered reflection suits the job: clear glass is generally the more practical option where judging clothing or seeing your face accurately is the priority.
5. Plan the mirror and lighting together
A mirror can reflect a lit lamp or bright part of the room, but it cannot replace a lighting plan. Test whether the reflected source is comfortable from your normal viewing position. A shaded table lamp may give a gentler reflected feature than an exposed bulb.
For grooming, consider how light reaches your face rather than judging only the glow behind the glass. Check the usable light output and controls of an illuminated mirror, as well as access to the power supply and any replaceable components.
6. Confirm weight, wall fixings and room suitability
Before ordering, ask for the mirror’s weight, approved hanging orientation and fixing instructions. The correct fixing depends on both the wall construction and the load. Do not assume the supplied fittings suit every wall: manufacturer guidance commonly specifies fixings appropriate to the wall material. [3]
Use the manufacturer’s specified hanging points and obtain competent installation advice if the wall or fixing capacity is uncertain. Check whether a leaning mirror requires a restraint. Keep heavy mirrors clear of places where they could be knocked, and plan how the packaged item will be carried through doors and up stairs.
For a bathroom, confirm that the particular mirror is suitable for that environment. For an illuminated or heated model, have a qualified electrician confirm its suitability for the intended location and the electrical installation requirements. A decorative mirror intended for a dry room should not automatically be treated as a bathroom product.
Mirror buying checklist
• Purpose: decorative focal point, dressing, grooming or a more open-looking room?
• Measurements: overall frame size, usable glass area, projection and furniture width.
• Reflection: view from the doorway, seated position and intended standing position.
• Lighting: daytime glare, direct sunlight and reflected bulbs checked.
• Installation: weight, wall type, hanging points and approved orientation confirmed.
• Practicalities: room suitability, cleaning instructions, collection arrangements and transport.
Frequently asked questions
Will a mirror make a small room look bigger?
It can create an impression of depth by reflecting another view of the room. The effect is strongest when the reflected scene is useful and uncluttered; there is no guaranteed amount by which a room will appear larger.
Should a mirror always face a window?
No. Check the actual reflection, direct sunlight and glare before deciding. A position beside the window may work better than directly opposite it.
How large should a mirror be above a console table?
Try two-thirds to three-quarters of the console width as a starting point, then test the full outline on the wall. This is a design suggestion, not a structural or safety standard.
Can any mirror be used in a bathroom?
No. Confirm the manufacturer’s room-suitability guidance. Electrical mirrors also need to suit their location and installation, which a qualified electrician should check.
Choose a mirror with help in Camberley
Bring a photograph of the wall, its dimensions, the furniture width and any lighting or finish samples to Illuminations of Camberley, 66–68 High Street, Camberley, Surrey GU15 3RS. We can help you compare scale and finishes and discuss how the mirror will sit within your scheme.
Online orders are for collection from Camberley. Not every online mirror is on showroom display; contact us before travelling to view a particular model. Call 01276 24941.
Sources and further reading
The optical and installation notes are supported by the sources below. Proportion, styling and layout suggestions are our practical design guidance; they are not universal rules. Sources checked 4 October 2026.
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