Measured. Fit.
The delivery-day check, done before you order. Measure the piece and the tightest stretch of its path into your home. This runs the numbers most shoppers learn on the doorstep: the opening, the turn inside, the stand-it-up swing, the shipping box, and the elevator if the route has one.
Won't fitAs measured, it doesn't make it. The failing check tells you why.
Shop what clears your opening instead:
Sofas & sectionals under 26″ deep, which clear your opening upright
Sofas & sectionals under 26″ tall, which travel on their side
Verdicts marked “tight” deserve a dry run: cut the piece's footprint out of cardboard and walk the path. The turn estimate is deliberately conservative, because movers do achieve things geometry frowns on.