Standard Mirror Sizes UK: A Complete Reference

Mirrors come in standard rectangular sizes, standard round sizes, and bespoke. The most common UK retail sizes are listed below in centimetres and inches, alongside the workshop's bespoke capability for any size or shape to specification.

This reference covers the standard rectangular sizes, the standard round sizes, indicative dimension ranges by room, full-length mirror sizes, the bespoke options we make in our workshop, the glass options that affect mirror choice, and a short note on choosing the right size for the space.

Standard rectangular mirror sizes

Rectangular sizes are the dominant retail category, running from small accent pieces through to full-length and feature mirrors. The sizes below are the centimetre dimensions most commonly stocked by UK retailers; inch conversions are rounded to the nearest inch. Anything larger than the listed range is usually made to measure rather than bought off the shelf.

Of those, the 40 × 50 cm, 50 × 60 cm, 60 × 80 cm and 80 × 100 cm bracket dominates UK domestic retail. Those four sizes cover most over-mantel mirrors, hallway pieces and bedroom mirrors sold by high-street and online retailers. Above 100 × 140 cm, the trade tilts towards bespoke. Hallway mirror sizes and bathroom mirror sizes are picked up in the by-room section below; the full length mirror size group is consolidated separately.

Standard round mirror sizes

Round mirrors are a feature shape, sold by diameter rather than width by height. Bespoke round mirrors are common in this category because the wall position, the piece of furniture below, or the symmetry of the room often dictates a specific diameter rather than a stocked one.

Round mirror sizes that fall between the listed diameters can be made to measure. For a feature piece on a particular wall, a bespoke cut that hits the right diameter often makes more sense than rounding to the nearest stocked size.

Standard mirror sizes by room

The dimension ranges below are indicative, drawn from UK interior-design conventions rather than prescribed workshop sizes. Bespoke remains the right move when the wall, the furniture below the mirror, or the symmetry of the room dictate something different.

Hallway. Hallway mirror sizes typically fall into two categories: a statement piece 80-120 cm tall above a console table or along a long wall, or a 40-60 cm round mirror as an entrance accent. Both work; the choice is driven by the geometry of the hall and the light.

Dressing room or wardrobe. A dressing-room mirror is usually a full length mirror size, 50-80 cm wide by 150-200 cm tall. Wall-mounted is the more common specification today; freestanding cheval-style mirrors sit in the same dimension range.

Bathroom. Bathroom mirror sizes over a single basin sit in the 50-80 cm wide by 60-100 cm tall range. For a double basin, 100 cm and over in width reads more in proportion with the vanity below. Glass and frame both need to tolerate humidity; the practical-care side of this is covered in our guide to cleaning and maintaining custom mirrors.

Dining room. A feature mirror in a dining room is typically 80-150 cm wide, often round or arched. The mirror sits above a sideboard or on a feature wall, and the round or arched shape tends to soften the rectangular geometry of the table and chairs.

Living room. Living-room mirror sizes for wall placement are 80-180 cm wide on a feature wall, with the ratio of mirror to wall sitting at approximately two-thirds of the wall width. Above a fireplace or a sideboard, that ratio holds against the furniture rather than the full wall.

Full-length mirror sizes and standards

Full-length mirror sizes consolidate the tall narrow end of the rectangular table above. The UK retail-common range is 50 × 150 cm, 60 × 170 cm, 80 × 190 cm and 100 × 200 cm. The dressing-room dimension range of 50-80 cm wide by 150-200 cm tall sits across that band as the working design convention. Tall narrow full-length mirrors are usually wall-mounted; freestanding cheval-style mirrors are typically 50-60 cm wide, which keeps the footprint manageable on the floor.

Bespoke mirror sizing at Harten

We make custom mirrors in any size or shape, including circular, oval, arched and irregular. Bespoke is the right answer when the wall, the furniture, or the design intent does not match a stocked size, which is most projects we quote. The mirror glass is cut to specification, the frame is built to any moulding profile, and the finish is applied in the workshop to match the room. Pricing for custom mirrors starts from around £400 and varies with size, glass type, profile and finish.

Glass options that affect mirror choice

Standard silver mirror. The conventional silvered-back float glass used in most domestic and commercial mirrors. Reflection is neutral and bright, the trade is well stocked, and it is the default for the majority of projects.

Low-iron mirror. Silvered-back glass with reduced iron content; the faint green tint visible in standard mirror glass is removed, giving a truer, slightly brighter reflection. It is the right specification for high-end interiors and for spaces where colour fidelity matters: dressing rooms, retail displays and photographic environments.

Antiqued mirror. Silvered-back glass with the silvering deliberately distressed to create a patinated, vintage-style reflection. Antiqued mirror is a decorative feature rather than a functional reflective surface. At Harten the antiqued effect is hand-finished in the workshop with bespoke patina effects, so the level of distressing is matched to the room rather than picked off a stock chart.

Choosing a mirror size for your space

A useful working rule for a feature mirror is approximately two-thirds of the wall width, or roughly half to two-thirds of the available wall height above a piece of furniture. The proportions read in balance with the room rather than competing with the furniture below. As a practical example, above a 1.8 m sideboard a rectangular mirror of around 100-120 cm wide, or a round mirror of around 80-90 cm in diameter, sits in proportion. For sizing picture frames rather than mirrors, our sister reference at standard picture frame sizes covers the equivalent A-series, photo and imperial standards.

Send us the wall dimensions, a photograph of the space if possible, and any shape or finish requirements, and we will quote on a bespoke mirror cut and framed to fit. Every mirror is built in our Bollington, Cheshire workshop and carries our 5-year guarantee on the framing.