Hi, I'm pretty sure as long as the height is less than 4 mars and its not attached to the house you can do almost anything you want but bearing in mind your neighbours, as for floors wooden floors will all ways be subject to attack from below,damp ,insects ect,with my own garage floor I layed 25mm thick polystyrene with a polythene sheet over and flooring grade tongue and groove chip board ( glue the joints) over that, resulting in very stable and much warmer on the feet floor, thought.... can you pamper a bike to much? Good luck.