How much does it cost to add another floor to a house?

If you are talking about adding a second story to a house, it would depend on the square footage of the area you are reflooring. For example, if you feel you need 800 more square feet of space and the remodelers tell you it is going to cost $145.00 per square foot, plus $8,000.00 more for the full bath, you are looking at a possible cost of $124,000.00 plus the 20 percent contingency.

If you are talking about putting down new flooring (carpet, tile, wood, laminate, etc) the answer is much the same as the cost of materials vary greatly.