I've been fortunate enough over the years to have a lot of repeat business, hopefully as a result of our workmanship and personable nature. One such repeat client initially hired us to help refinish the second floor of their home, and what a project that turned out to be.
An older house, the second floor was built with a staircase leading to it, but the space was always intended to be an attic, not finished off as-is. Somewhere along the way a previous homeowner decided to finish the second floor, including a full bathroom, and did so in a very inadvisable manner. As a result the second floor began sinking into the first floor and caused the current homeowner all kinds of problems.
The homeowners handled most of the demo, which included cutting away the 3/4" hardwood floor (there was no subfloor), removing all the 1/8" paneling from the wall (there was no drywall behind it), and tearing out the previous floor supports, which were 2x4s laid on their side (almost no structural value). From there, with the assistance of the homeowners who handled painting, staining, etc., we came in and took care of the framing, drywall, drywall taping, flooring, and door and trim installation.
As is the case with most big projects, one area of construction bled into another and before any of us knew it, we were rebuilding the stairs leading to the second floor, and then rebuilding some of the 1st floor near the landing of those stairs. The project turned out better than even I had expected it to, and should save any future homeowners the stress and expense of having to deal with the issues the current homeowners faced.