Will it fit? Measuring doorways, stairs and the room first

Measure the route before you measure the room

Walk the path the item will take with a tape: the gate, the front door, the hall, the turn at the foot of the stairs, the stair width, the half-landing, the bedroom door. Write down the narrowest point of each, measuring the clear opening with the door open rather than the frame.

The dimension that has to clear a turn is not the length of the piece, it is the diagonal of its end face. A sofa 95 cm deep and 85 cm tall has an end-face diagonal of about 127.5 cm, which is the square root of 95 squared plus 85 squared. A hall that measures 110 cm across at the turn will not take that piece round the corner however carefully it is handled.

Two things buy you room. Feet that unscrew reduce the height by their own length and are usually the difference on a tight stair, and a back that bolts on separately turns one awkward 127.5 cm diagonal into two manageable pieces. Both are questions to ask before ordering rather than discoveries to make on the doorstep.

The clearances this site plans with

Once the piece is in the room, the question is what is left around it. These are the figures the room-fit calculator on this site uses, and they are planning conventions rather than published standards.

They are deliberately generous in one place and tight in another. A 75 cm walkway is enough for two people if one turns sideways, which is realistic for a route past a sofa; 90 cm is what a route that is also the way to a door should get. The 40 cm between sofa and coffee table is the figure that stops a room feeling like a waiting area.

Applied to a 340 cm room, a 95 cm sofa with a 40 cm gap, a 50 cm coffee table and a 75 cm walkway uses 260 cm and leaves 80 cm of spare floor. That 80 cm is the margin that absorbs a rug, a side table or the fact that the wall is not quite straight.

Dining rooms fail on pull-out, not on table length

People size a dining table on its length and the room fails on its width. A table 90 cm deep needs 90 cm behind the chairs on each side for someone to push back and stand, which is 90 plus 90 plus 90, or 270 cm of room width before anything else is considered.

In a 300 cm wide room that leaves 30 cm — enough to work, with nothing against either wall on those sides. In a 260 cm room it does not work at all, and the fix is a table 70 cm deep or chairs on one side only with a bench against the wall on the other.

Length is the easy direction because you can see it. The test for it is that each diner needs about 60 cm of table edge, so a table seating three a side needs about 180 cm of usable length between the legs rather than overall.

• A 90 cm deep table plus 90 cm of pull-out on each side needs 270 cm of room width
• In a 300 cm room that leaves 30 cm of spare floor across the width
• A 70 cm deep table reduces the requirement to 250 cm of room width
• Allow about 60 cm of table edge for each diner, measured between the legs
• A bench against a wall removes the pull-out requirement on that side entirely

If it does not fit, which right applies

A sofa that cannot be carried into your house is not a faulty sofa. Section 22 of the Consumer Rights Act 2015 gives a short-term right to reject goods that do not conform to the contract, ending 30 days after ownership transfer, delivery and any required installation — and a correctly supplied piece conforms, whatever your hallway measures.

What does apply to a distance purchase is cancellation. Government guidance for sellers states that a customer has 14 days from receiving the item to say they are cancelling, a further 14 days to send it back, and that the seller has 14 days from receiving it to refund. On a large item the return carriage commonly falls on the buyer, which is why a tape measure is the cheapest part of this process.

Some sellers operate a failed-delivery charge where the item never comes off the lorry. That is a term of the contract rather than a statutory position, and it is worth reading before you order in the knowledge that your hall turn is marginal.

A measuring order that catches the failures

Do it in this sequence and the expensive discoveries happen while the order is still a browser tab. Route first, narrowest point written down. Then the end-face diagonal of the piece, computed from its depth and height rather than read off the listing. Then the room, across its narrow direction, with the clearances subtracted.

Finally, mark it on the floor. Masking tape at the sofa's footprint and the coffee table's, left down for two days, catches what no arithmetic does: that the route to the kitchen now goes round rather than through, and that the door into the room opens onto the arm.

Before you buy

• Walk the delivery route with a tape and record the narrowest point of each stage
• Measure clear openings with doors held open, not the door frames
• Compute the end-face diagonal of the piece from its depth and height
• Compare that diagonal with the hall turn, not the sofa's length
• Ask whether the feet unscrew and whether the back bolts off separately
• Measure the room across its narrow direction and subtract this site's clearances
• For a dining table, check room width against table depth plus 90 cm on each side
• Tape the footprint on the floor and live with it for two days before ordering

Questions readers ask

What is the end-face diagonal and why does it matter?

It is the diagonal across the end of the piece, computed from its depth and height. For a sofa 95 cm deep and 85 cm tall it is about 127.5 cm, the square root of 95 squared plus 85 squared. That is the dimension a hall turn has to clear, because the piece is tipped and rotated at a corner rather than carried flat.

How wide does a walkway need to be?

This site plans with 75 cm for a walkway past furniture and 90 cm where the walkway is also the route to a door. At 75 cm two people pass if one turns sideways; at 90 cm they pass square on. Both are planning conventions rather than standards, so adjust them for a household using a wheelchair or a walking frame.

How much room does a dining table really need?

Its depth plus 90 cm of chair pull-out on each side. A 90 cm deep table therefore needs 270 cm of room width, which leaves 30 cm in a 300 cm room. A 70 cm table needs 250 cm. Table length is the easy direction: allow about 60 cm of edge per diner between the legs.

Can I cancel an order if the delivery fails because it will not fit?

You can cancel a distance purchase within 14 days of receiving it, with 14 more days to return it and 14 days for the refund after the seller gets it back. The 30-day short-term right to reject does not apply, because a correctly supplied sofa conforms to the contract. Some sellers also charge a failed-delivery fee under their own terms.

Do I need to measure if the shop offers a home survey?

Measure anyway, and compare. A survey covers the surveyor's assumptions about what they will remove and how; your measurements tell you what happens if the door cannot come off its hinges on the day. Writing both numbers down takes 10 minutes and is the cheapest insurance in this guide.

Sources

1. legislation.gov.uk — Consumer Rights Act 2015, section 22: the short-term right to reject ends 30 days after delivery, transfer of ownership and any installation — checked 2026-11-03
2. GOV.UK — Accepting returns and giving refunds: 14 days to cancel a distance purchase, 14 days to return, 14 days to refund — checked 2026-11-03
3. legislation.gov.uk — Furniture and Furnishings (Fire) (Safety) Regulations 1988: display and permanent labelling on upholstered furniture — checked 2026-11-03