How much can i charge to do roofing for unknown homes construction? i need price per SF

i need price per SF
Cheap electricals ?
Answers:    $0.25 per ft/sq is average surrounded by the South-Eastern Region of the United States of America.
Suggestions for fixing up a cracked driveway?
it usually pays by the square, (100sq. ft) avg. would be about$20.00 a sq. straight runs are fine that way, but if you catch into a lot of dormers, and valley it is time consuming.
Is here a plumber within the house? Quick...