A sleeper sofa hides a folding steel bed frame and mattress inside the cushions, which routinely adds 50 to 100 pounds over an equivalent regular sofa. Plan for a heavier lift than the size suggests.
Pro tip: If you can, unfold the bed and remove the thin mattress before the lift, it is genuinely lighter to carry that piece separately.
Watch out: Underestimating a sleeper sofa's weight is the most common way to hurt your back on moving day, treat it as significantly heavier than its visual size.