In an effort to reduce costs, you might face with a situation that you might think about just laying new floor over your existing floating floors. Face of Wood Flooring explains why this is not a good idea, and can give you some problems.
It is generally not advisable to install flooring over a floating floor. Floating floors tend to disassemble easily since they are not attached to the subfloor.
Newer laminate floating floors are dry-joined with a fold-and-lock mechanism; they are simple to detach. Older laminate floors may be glued together, plank to plank. But because laminate is made of thin fiberboard, it is easy enough to snap off and break the flooring rather than dealing with the glue.
If you do decide to install a floor covering over your floating floor, you will need to install a hard underlayment such as plywood or cement tile backer prior to laying the floor covering.