Taking door measurements is a crucial but often overlooked step in buying a sofa. You can flip and turn a sofa several ways to get it through a doorway, but only if the width or height is at least several centimetres smaller than the door. Before you return the sofa to the furniture shop, take some quick measurements -- it may be possible to squeeze it through. If not, you may be able to call a professional to take the frame off the door to give you a few more centimetres of wiggle room.
Measure the width, height and diagonal height of the door with a metal tape measure. Measure from inside edge to inside edge.
Measure the sofa's height from the base of one of its back feet to the top of its back. Next, measure the sofa's width at its base. Measure the horizontal distance from the back of the frame to a point just above a front leg. Finally measure the sofa's length. Move to the back and hold your tape measure at one end of the frame. Stretch the measuring tape out from one end of the back to the other in a line parallel to the floor.
Compare the sofa's length to the height or diagonal height of the door. If the couch's length is narrower than the height of the door by at least 7.5 or 10 cm (3 to 4 inches), the sofa can be squeezed through standing on its end.
Compare the height and width of the sofa to the width of the door. The sofa's width or height must be narrower than the width of the door by at least 7.5 to 10 cm (3 to 4 inches).
If your sofa is only 5 cm (2 inches) narrower than the height or width of the door, you may still be able to get it through. However, with only 2.5 cm (1 inch) of give on each side of the couch, you risk damaging the upholstery as you squeeze it through the frame.