In Central Florida the range is extensvie! BUT for a professional company (the ones with proper insurance...and workers comp coverage NOT exemption) will get around 12-18 cents for decent work. That is for up to 5k feet.
22-28 cents for the kind of work that builders KNOW are gonna pass muster when it is punch-out time.
recently I did a house/mansion with 20 thousand feet! 8 milliong dollar home...the rate was 45 cents.
also, are you gonna allow for the late plumber who just got glue on your nicely cleaned floor and now the builder thinks you should clean it at no extra charge? or are you gonna re-bill every time.