Will It Fit? How to Check Before the Sofa Arrives

Last updated: 23 August 2026

Furniture has to pass three tests, and most people only run one. It has to fit in the space where it will live, it has to fit through every opening on the route, and it has to be manoeuvrable at every turn along the way. The second and third are what strand sofas on staircases. The diagonal of the piece, not its width, is what gets it round a corner.

Ten minutes with a tape measure beats a restocking fee and an afternoon.

Test 1: does it fit where it is going?

The easy one, and still worth doing properly.

Measure the space, then subtract the clearance the piece needs to be usable — not just present. A wardrobe flat against a wall with no room to open it has technically fitted and practically failed.

Piece	Also needs
Wardrobe / cupboard	0.75 m in front, to open and stand
Bed	0.60 m at one side minimum, to get in and make it
Desk	0.75 m behind, for the chair
Dining table	0.75 m all round for chairs, 1.00 m where people walk behind
Sofa	0.40 m to a coffee table, 0.90 m for a walking route

Mark it out on the floor. Masking tape, at the real dimensions — see standard furniture dimensions if you do not have the piece yet. Then live with the outline for a day. It tells you things a measurement does not, particularly about routes you take without thinking.

Test 2: does it fit through the openings?

Every doorway, every hallway, and — the one people forget — the stairwell.

For each opening, measure:

Clear width with the door open, which is the frame minus the door leaf thickness — usually 40–50 mm less than the frame.
Clear height, floor to the underside of the frame.
Any obstruction: radiators, handrails, light fittings, a meter cupboard.

Common interior door widths are 730 / 830 / 930 mm in continental Europe, 762 mm in the UK and 813 mm (32 in) in the US. Subtract the door leaf and a 762 mm frame gives you roughly 715 mm of actual gap.

A sofa does not have to fit the opening flat. It can go through on its side or at an angle, which is why the next test matters more than this one.

Test 3: can it turn the corner?

This is the test that fails, and it fails at the top of the stairs.

The number that matters at a corner is the diagonal of the piece, not its width. A sofa 2.00 m long and 0.90 m deep has a diagonal of about 2.19 m — that is the space it sweeps through as it pivots.

For a right-angle turn in a corridor, the rough rule is that the piece's length must be less than the sum of the two corridor widths, minus a margin. Two 0.90 m corridors meeting at a right angle will take a piece up to roughly 1.60–1.70 m long comfortably. A 2.20 m sofa will not go round, no matter how much you push.

Where this bites hardest:

Half-landings on stairs. A turn plus a ceiling above it, in three dimensions at once.
Corridors into rooms where the door is near the corner.
Anywhere with a handrail, which removes 80–100 mm you did not count.

In short: measure the diagonal of the piece and the width of both legs of every turn. If you only take one thing from this page, take that.

The ten-minute check

Write down the piece: width, depth, height, and the diagonal (√(w² + d²)).
Walk the route from the front door to where it will stand. List every opening and every turn.
Measure each opening: clear width and clear height.
Measure each turn: the width of both corridors meeting there, and the ceiling height if there is a stair involved.
Compare: the piece's smallest cross-section against each opening, and its length against each turn.
Check the destination with the clearances from Test 1.

If any step is marginal, ask the retailer whether the legs come off — on many sofas they do, and it buys 100–150 mm of height.

Doing this on a plan instead

A floor plan does most of this for you, because the furniture is drawn at real size and you can see the route rather than imagining it. That is a large part of what floor plan software is actually useful for — not visualising a finished room, but catching the problems before they cost money.

What a plan will not tell you: ceiling heights along the route, handrails, whether the piece can tilt, or how much a sofa flexes. A plan is two dimensional and stairwells are the most three-dimensional problem in the house. The key difference is that a plan catches the layout failures and a tape measure catches the delivery failures — you need both.

Frequently asked questions

How do I know if my sofa will fit through the door? Compare the sofa's smallest cross-section — usually its height by its depth, since it can go on its side — against the door's clear width with the door open. Then check every turn on the route using the sofa's length against the combined width of the two corridors. The door is rarely the problem; the turn after it usually is.

What is the minimum door width for furniture? There is no minimum, but as a rule a 760 mm door (about 715 mm clear) will pass most sofas turned on their side, most mattresses, and most wardrobes delivered flat-packed. Assembled wardrobes and corner sofas are the common failures.

How much space do I need to walk between furniture? 0.90 m for a main route through a room, 0.70 m for a secondary route used by one person. Below 0.60 m it stops being a route and becomes a gap.

Can I take the legs off a sofa to get it in? Very often, yes — most sofa legs are bolted rather than fixed, and removing them buys 100–150 mm of height. Ask before you buy; the answer decides borderline cases.

What if it does not fit? Before giving up: check whether the piece disassembles, whether a window is wider than the door (specialist delivery firms do use them), and whether a modular version of the same design exists. Sectional sofas exist precisely because of this problem.