If you opt for a less-costly option such as corrugated or ribbed steel roof, your cost will likely fall within $3.00 to $6.00 per square foot installed, depending on the metal thickness (gauges for steel or mils for aluminum) and the quality of paint finish (acrylic vs. Kynar 500 or Hylar 5000) for the system being installed, as well as your home’s geographic location.