Cut and Fold a Box Spring
Is your box spring too big to fit in your stairway or around a tight corner? You could buy a “split” box spring designed specifically for this (and pay several hundred bucks) or cut your existing box spring and fold it so it fits. There's actually a simple, ingenious way to cut and fold your box spring without wrecking it.
Remove the fabric covering (the most tedious part of this whole process is removing the staples) and place the box spring face down. Pull back the mattress cover along each side and cut through the frame just to the left or right of the middle crosspiece (don't cut through the crosspiece itself). Do this on both sides and in the center. You can now fold the box spring like a book as shown and move it. Secure it with a strap to prevent it from springing open.
To put it back together, screw a 1x2 along the center crosspiece cuts and against the inside of the outer frame to reinforce them. Then staple the fabric covering back in place.