The “cost” of a new roof depends on several variables, including: the roofing material you are installing (asphalt, metal, slate, tile, or cedar shake), the size of your roof, whether you are adding a layer overtop or tearing off and replacing, as well as the quality of the material you are considering. For instance, a 3-tab asphalt shingle roof replacement on a 1,500 square foot home, will cost less than installing dimensional shingles. Moreover, architectural shingles on a 1,500 square foot home will cost less than standing seam metal or a DaVinci slate roof. The cost is dependant on many variables.