What to Measure Before Buying Furniture: A Complete Checklist
The tape-measure checklist, in the order to actually use it
Every furniture-buying disappointment traces back to one of a small number of measurements that either weren't taken, or were taken and then not checked against anything. This is the complete list, in the order that actually matters, because measuring the room before measuring the doorway is how a perfectly-sized sofa ends up stuck in a stairwell.
1. The room itself
Wall to wall, in both directions, at the room's widest and longest points. If the room is not a plain rectangle (an alcove, a chimney breast, a bay window) measure those separately: the overall bounding size, and then the size and position of whatever is cut into it.
Two things people get wrong here:
- Skirting boards and radiators eat real floor space. A sofa's stated width has to fit inside the gap between them, not the gap between the bare walls.
- A sloped ceiling changes the usable footprint, not just the height. A tall piece, a wardrobe or a bookcase, may fit the floor space but not the headroom a metre in from the wall.
2. Every doorway and turn the furniture has to travel through
Not just the destination room's door: every doorway, hallway corner and staircase turn between the delivery van and the final spot.
Measure the clear opening width: door open to 90°, gap between the frame edges, not the door's nominal size. This is usually 5–8 cm narrower than people expect.
For anything that does not bend (a sofa frame, a dining table, most beds) the number that actually matters at a tight turn is the diagonal measurement of the piece, not its width. A sofa can be walked through a doorway on an angle that a straight-on width measurement doesn't account for, which is also why the reverse catches people out: a piece that looks too wide for a doorway sometimes isn't, once it's tilted through.
3. The furniture you're keeping
Every piece staying in the room, measured as it actually is now, not as its original listing described it. A sofa that has been recovered, a table with a different set of legs, a wardrobe with an added shelf: all of these can differ from the manufacturer's spec sheet by a meaningful amount.
Width, depth and, where it matters against a window or sloped ceiling, height.
4. The gaps the new piece has to leave
This is the measurement step that turns “does it fit the room” into “does it actually work”, and it depends on what's already there, so it has to happen after step 3, not before.
| Gap |
Minimum |
Comfortable |
| Sofa to coffee table |
30 cm |
45 cm |
| Beside a bed, to get in |
45 cm |
60 cm |
| Behind a dining chair, to pull it out |
60 cm |
75 cm |
| In front of a wardrobe |
60 cm |
90 cm |
| In front of drawers and low storage |
45 cm |
60 cm |
| At a desk, to push the chair back |
60 cm |
90 cm |
| Sofa to television |
150 cm |
200 cm |
Plus a general walkway allowance: 60 cm for a route past one piece, 90 cm for a route two people share, which is worth pacing out even though it isn't one of the numbers above.
5. Fixed points you cannot move
The things that constrain a layout regardless of what furniture goes where:
- Every socket, and what needs to reach it: a lamp, a TV, a bedside charger.
- Radiators, which furniture placed directly against them will block.
- The TV aerial or ethernet point, if the television's position is not yet decided.
- Which way each door swings, and the arc it needs clear.
6. Windows, if soft furnishings are part of the plan
Width and drop, and whether curtains will hang inside or outside the recess, a decision that changes both numbers. See the curtain measuring guide below for the full method; the short version is that the rod sits wider than the window opening, and the fabric hangs longer than the rod-to-floor distance if the style is anything other than a hard break at the sill.
Write every number down against a sketch, not a list
A list of numbers with no room to hold them against is easy to misapply: a 45 cm clearance measured against the wrong wall reads the same as one measured against the right one. Sketching the room, even roughly, and writing each measurement onto the wall or gap it belongs to catches mismatches before they turn into an order.
The faster version of the same sketch: draw the room to scale in Nooked, and let the numbers above check themselves against whatever you place.
Common questions
- Do I need to measure the room if I already know its square footage?
- Yes. Square footage says nothing about the shape, and shape is what decides whether furniture fits. A 20 square metre room that is a long narrow rectangle takes a very different sofa than a 20 square metre room that is close to square, even though the two hold the same amount of floor.
- What's the single most forgotten measurement?
- The door's clear opening width, as distinct from the doorway's overall width, which includes the frame. People measure the room carefully and then discover the sofa cannot get past the front door, because nobody measured the one gap the piece actually has to travel through.
- Should I measure with the old furniture still in the room, or after it's gone?
- Both, if you can. With the old piece in place, you get the exact space it occupies, which tells you the true footprint available for its replacement. After it's gone, you get the room's real boundaries, including the wall the old piece was hiding, which sometimes turns out to have a socket, a radiator or a skirting board detail that changes what fits.
- How accurate does a phone app's room scan need to be?
- Treat it as a starting point, not a final number. Phone-based room scanning is commonly off by several centimetres, which is small compared to a room but large compared to a clearance gap. A sofa placed 3cm off from a scan-derived measurement can be the difference between clearing a coffee table and not. Confirm with a tape measure before ordering anything.
All guides · Check your own room