Straight answer: a sofa moves through a doorway on its diagonal, not its width. Tilted on end, a sofa's effective height is √(depth² + width²) — a 95 cm-deep, 90 cm-tall sofa needs about 131 cm of clear diagonal height. Your front door gives you 76–85 cm of width but 195–200 cm of diagonal height, so for most sofas the doorway isn't the problem: the turn after it is. Measure the route corner by corner, not just the door.
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The three measurements that decide it
First, the door's clear opening — remove nothing yet, but measure with the door at 90°, because the door leaf eats ~4 cm and the handle more. Second, the diagonal depth of the sofa (depth² + height², square-rooted): this is the number that fits through when the sofa goes in nose-up. Third, every turn on the route: hallway width at the tightest point, landing size, stairwell headroom at the turn. A sofa that sails through the door can still die on the landing corner.
The room doesn't matter if the route doesn't
The classic tragedy is a sofa that fits the living room beautifully and never gets past the stairwell turn — Good Housekeeping's interior experts make the same point about measuring doorways, staircases and elevators before falling in love with a showpiece. Walk the route with a tape and a phone camera, note the two tightest points, and compare both against the sofa's smallest rigid dimension. If the smallest dimension minus packaging is bigger than your tightest point, the sofa is coming in in pieces or not at all.
| Checkpoint | Typical UK/US value | What it limits |
|---|---|---|
| Front door clear width | 76–85 cm | Sofa width (upright) or depth (tilted) |
| Door diagonal height | 195–200 cm | Sofa diagonal depth when tipped |
| Hallway width | 85–110 cm | Sofa depth carried level |
| Stair landing turn | 120–140 cm diagonal | Sofa length — the usual killer |
Disassembly buys you centimetres
Unscrew the four legs: minus 10–15 cm of height, plus the sofa becomes a low box that tilts better. Take the door off its hinges: plus 4–5 cm of clear width, zero cost, one screwdriver. Take off cushions (obviously) and any removable backrests. If the sofa still fails the maths, a model that ships flat-pack or in two modules sidesteps the entire problem — click-clac and fold-flat designs exist precisely because of this measurement, and they out-climb stairwells that defeat whole sofas.
And measure before you order, not on delivery morning. Drivers will happily stand in the rain watching you renegotiate with a stairwell, but the return window and restocking fee won't be as patient.
UK vs US doorways: know your league
UK terraced houses famously run 76–80 cm doors and 85 cm stair turns — the reason British flat-pack culture is a survival adaptation, not a preference. US homes are generally kinder (80–90 cm doors, wider turns), but older brownstones and apartment buildings can be worse than any British terrace, with sharp turn angles and no lift. The method is identical everywhere: smallest rigid dimension of the sofa versus tightest point of the route, with 2 cm of humility subtracted from each.
Keep reading
More dimension guides are in the collection, and the full index is on the furnolio journal.
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