Roof replacement prices in US range from $. $. per sq.ft. for Asphalt Shingles to $. $. per sq.ft. for Metal Wood, etc . Your actual cost will .How much a new roof should cost. Average costs and comments from CostHelper’s team of professional journalists and community of users. Do it yourself materials to .The cost of replacing a roof depends on several key variables, including total roof surface area, materials used, labor and any extras for warranties or guarantees..Florida Consumer Consideration in Replacing Their Roofing System The FRSA provides the following information to help Florida consumers when selecting.