This product is super versatile! I was pleased it fit through my 28” wide front door with plenty of room to spare. The widest part of the sectional is the corner with the attached armrest which just under 21” wide. It would definitely fit up a narrow staircase when taken out of the box. It was a breeze to attach the back and put together. It is true that the pieces do not hold together well so you will probably want this against a wall and on some carpet. I plan on purchasing anti-skid in pads online. Each piece came in its own box. The only disappointing thing about this sectional is that the ottoman doesn’t have storage.