How to measure before buying a sofa
Most sofa problems start with a sofa that won't pass the door or the lift.
Measure the route, not just the room
Measure the door, the lift and the stair turns. Compare them with the sofa's depth and height, because a sofa goes through sideways.
Leave room to walk
Leave about 40 cm between the sofa and coffee table, and about 75 cm for the main walkway.
Ask about stairs
If there's no lift, ask whether carrying is included. A written quote should show it separately.