Measuring a Room Before You Buy Furniture Online

Almost every piece of furniture returned from an apartment fits the room perfectly. What it does not fit is the staircase, the hallway turn or the doorway it had to pass through first. Measuring for delivery is a different job from measuring for placement, and both take about ten minutes.

Measure the gap, not the wall

The number people usually take is the length of the wall. The number that matters is the usable gap: wall to wall minus the radiator, minus the baseboard depth, minus the swing of any door or cupboard that opens into the space. In a pre-war apartment those subtractions routinely remove six to eight inches from what a tape measure across the wall suggests.

Write the gap down as a single figure and treat it as the ceiling rather than the target. A side table that measures exactly the width of the gap will look wedged in and will make cleaning behind it impossible. Aim to leave at least two inches of air on each side of a freestanding piece.

Measure the path the box has to travel

Delivery failure is almost always a path problem. Walk the route from the building entrance to the room, and take the narrowest point along it: an entry vestibule, the turn on a staircase landing, the interior width of a lift, the swing of a fire door held open.

For staircases, the constraint is not the tread width but the diagonal available at the turn. Measure the distance from the inside corner of the turn to the outer wall, and compare it to the longest dimension of the carton rather than the assembled piece.

Doors are narrower than you think

A door listed as thirty-two inches is a thirty-two inch leaf, which leaves roughly thirty inches of clear opening once the frame and stops are accounted for, and less again if the hinges prevent the door opening fully flat against the wall.

Measure the clear opening with the door open, from the face of the open door leaf to the opposite frame. That single figure rules more furniture in or out than any other measurement in an apartment.

Assembled dimensions versus boxed dimensions

Flat-packed shelving, bookcases and most tables arrive in cartons considerably smaller than the assembled piece — that is the point of flat packing. A six-tier bookcase that stands sixty-seven inches tall may arrive in a carton under forty inches long.

Pre-assembled items, and anything with a fixed frame such as a mirror or a floor lamp column, do not shrink. For those, the assembled longest dimension is the number to take to your staircase measurement.

Height, sightlines and the feeling of space

In a small room, tall and narrow beats short and wide. A sixty-seven inch corner shelf occupies roughly the same floor area as a side table but holds several times as much, and the vertical line draws the eye upward, which makes a low-ceilinged room read taller.

The counterweight is sightline. Keep the pieces between you and the window low. A tall unit against the window wall blocks daylight for the whole room; the same unit on the opposite wall reflects it back.

Walkways and the eighteen-inch rule

A comfortable primary walkway needs about thirty inches of clear width. A secondary route — the path to one side of a bed, or between a sofa and a coffee table — works at eighteen to twenty-four inches. Below eighteen inches people start turning sideways, and a room that requires that begins to feel cramped regardless of its actual size.

When you plan a layout, mark the walkways on the floor with painter's tape before you order anything. It costs nothing and it reveals collisions that a floor plan on paper hides.

Rugs: the most commonly mis-sized purchase

An area rug that is too small makes a room look smaller, because it visually shrinks the floor plane it sits on. The usual guidance is that the front legs of the seating should sit on the rug, which for most living rooms means an eight by ten rather than a five by seven.

Measure the rug area as a rectangle that extends at least six inches beyond the seating on each side. In a dining area, the rug should extend far enough that a pulled-out chair still has its back legs on it.

Write it on one card

Keep a single index card, or a note on your phone, with five numbers: clear door opening, narrowest point on the delivery path, ceiling height, the usable gap in each room you are furnishing, and the walkway widths you need to preserve.

Every product page here leads with dimensions. With those five numbers in hand, most buying decisions take under a minute and almost none of them turn into a return.

Where to go next

Every listing in the shop carries assembled dimensions, and boxed dimensions where the item ships flat-packed.

• Browse Tables or the full shop.
• Sizing, delivery and payment questions are answered on our FAQ page.
• Delivery times are set out in the Shipping Policy; returns in the Return & Refund Policy.
• Still stuck? Contact us — we reply within 24 hours on business days.

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