Let me throw my thoughts into this mix.....
Think about the "join the gym" situation... I have a brother in law that owns a gym.... Here is his theory.. If you can committ yourself to walking a 1/2 hour per day, and 1/2 hour of floor exercise in your home, then you are ready for a committment to take on the finanical obligation of a gym membership.... Otherwise, it is just a pipe dream of something you will commit to on a whim and not follow through with....
The same holds true with dance practice...
Before you take on the expense of remodeling your basement with a dance floor, are you absolutley committed to a few hours of dance practice each night??? Just walking down a flight of stairs makes it so easy to say, not tonight, maybe tommorrow...
This is why I have no exercise equipment in my house... It is much more of a motovation to go to the gym each night.... Also why there will never be a dance floor in my house... We go to the studio to practice.... I check with the instructors as to who will be in that evening.... And we plan in advance to go to the studio to practice.... You cannot build a stuidio in your basement, with adequate space unless you have a 6000+ house, less you dance in the laundry room, as a previous poster stated.... If you are dancing smooth or standard, this lack of space will cause damage as you will shorten up your flight, and that will become habit...
I suggest, talk with your studio, and schedule time that you can realistically committ to practice before you take on an expense that will be nothing more than a spot the cleaning lady has to deal with.......
Every amatuar couple that I know that has taken on this expense, has never used the dance floor as intended... Instead they use it for dinner parties, or most of the time, just not used at all...........