For a mirror to change how a small room reads, it should cover at least 10% of the wall it hangs on and reflect something worth looking at — a window, a lamp, a lighter wall. Below that it is decoration; above 25% it starts to feel like a corridor in a gym. A full-length mirror should be 150–170 cm tall with the centre at 145–165 cm from the floor.
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The 10% rule, in real sizes
| Wall | 10% of it | Mirror that does the job |
|---|---|---|
| 2.4 × 2.4 m (5.8 m²) | 0.58 m² | 80 × 80 cm, or 60 × 100 cm |
| 3.0 × 2.4 m (7.2 m²) | 0.72 m² | 90 × 80 cm |
| 3.6 × 2.5 m (9 m²) | 0.9 m² | 110 × 80 cm, or an arched 150 × 50 cm |
| Door (2.0 × 0.8 m) | — | 150 × 50 cm leans or over-door |
One 110 × 40 cm mirror is 0.44 m² — under 5% of a 9 m² wall. It is a lovely object and it will not make the room feel bigger, because there is not enough reflective area for your eye to register a second space. Two small mirrors in the same corner do not add up either; they add clutter instead.
Placement beats size
- Opposite a window: the highest-return position in any room. It doubles the daylight and puts a bright rectangle where your eye lands when you walk in.
- Perpendicular to the window: second best. It throws light sideways across the room without showing the street.
- On the short wall of a long room: makes a 4 × 2.4 m room read closer to 4.6 m, because the reflected depth is added to the perceived depth.
- Facing the bed: the one placement to think twice about. Not for folklore reasons — a mirror reflects every passing car headlight and phone screen straight at the pillow, and sleep quality notices. If the room demands it, angle it 5–10° off the bed or use a narrower mirror at 60 cm wide.
- Behind a door: free wall, but check the door handle swing. A 2 mm skirting board and a 5 mm frame add up to a cracked corner.
Hang it, lean it, or wall it
Leaning is the renter's answer: a 150 × 50 cm mirror leaning at 5–8° from the wall needs only a 40 cm floor footprint and no holes. Strap it at the top regardless — a leaning mirror is a falling mirror waiting for a hoover. Hanging is better in small bedrooms, where 40 cm of floor is the difference between a walkway and a shuffle. A full wall of mirror panels adds depth but reads as a wardrobe door; in a bedroom that is usually a bug, in a narrow hallway it is a feature.
Frame depth and light
Keep the frame under 3 cm deep in a tight room; deeper frames cast shadows that shrink the reflection. Backlit mirrors do more work than expected: a 60 × 80 cm panel with a 3000–4000 K edge glow at 300–500 lux reads as a window at dusk, and it replaces a lamp that would have taken 30 cm of the dresser. That is a 2-for-1 in a 9 m² room, which is the only kind of bargain that matters when there is no floor left.
Three arrangements that reliably work
- The hallway squeeze: a 150 × 50 cm arched mirror on the wall opposite the front door, centre at 155 cm. Adds light to the darkest 4 m² in most flats and gives you a full-length check on the way out.
- The bedroom corner: an 80 × 180 cm leaning mirror at 5° in the corner opposite the window, strapped at the top. Takes 40 cm of floor and doubles the daylight hitting the bed.
- The desk wall: a 58 × 48 cm lit vanity mirror at 120 cm centre to the side of the window rather than in front of it, so the light is even instead of half a face in shadow.
All three follow the same logic: reflect something bright, keep it at eye level, and put it where you already look when you walk in. A mirror in a corner you never face is a £200 rectangle of good intentions.
Keep reading
More dimension guides are in the collection, and the full index is on the furnolio journal.
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