Left-hand or right-hand?

Stand facing the sofa. If the long arm or chaise is on your left, it's a left-hand facing corner. Most ranges are available both ways — pick the one that puts the short side against the wall and the long side into the room, so the TV is visible from every seat.

Measure the room, not the sofa

Draw the room, mark doors and radiators, then mark the sofa's two outside lengths. Leave at least 60cm walkway where people pass. Corner sofas arrive in sections, so access is rarely a problem, but we'll check the route with you anyway.