Typically, a metal roofing job is more expensive than your average asphalt roofing job. Due to a very technical installation process and specialized training required for your contractor, metal roofing can cost up to 3 times as much as asphalt roofs. However, you may feel justified in the extra cost in that many people have said that, in addition to long term maintainance savings, they saved up to 20% in their cooling costs.