Here's something you can do at home to check clearances up and down stairs on large pieces. In this case, I have a customer who wants to order a $ 13,000 sectional and we want to make sure it fits up the steps of his home as best we can. He's 2,200 miles away from my store so we have to do all the measuring by photos and the like. So I suggested he get three boxes like this, tape them together and then with two people, one on each end, see if they can maneuver these empty boxes up the stairs. While this is not sure-fire, it will get pretty close to this sectional dimensions. And since the boxes are so light, this can be done easily and doesn't require a lot of strength to move around, unlike the real thing. Just a quick sketch on scrap paper...

Click image for larger version. 

Name:	boxes.jpg 
Views:	577 
Size:	46.2 KB 
ID:	7316