Or that they don't make open spaces large enough.

Close friends of ours just bought a newly built condo. The space above the stairs leading up to second floor bedrooms was barely big/tall/wide enough to let a single bed pass - let alone a double or queen bed. The windows were not tall or wide enough either.

The contractor initially refused to do the changes since he had followed the architect's plans to the line. The estate owner finally paid for it. The contractor had to raise the ceiling above the stairs, which resulted in a wide chunk being taken out of the bedroom immediately above them.