price per square shingles installed
Cost to install steel shingles, on a simple gable roof: $775-850 per square. Cost to install aluminum shingles, on a simple gable roof: $875-950 per square. A more complicated roof will increase in price by $100-200 per square (compared to an increase of $350-500 in case of a standing seam roof).
1 High end architectural shingles, however, could run as much as $6 to $8 per square foot installed ($9,000 to $12,000). 2  Removing and disposing of your existing roof could cost an additional $1 to $4 per square foot to the total asphalt shingle roofing cost.
It depends on the type of roof. A single story low pitch asphalt shingle roof will cost around $40 - $80 per square (100 sq. ft.) to tear off and $75 - $100 per square to install new shingles. If the plywood sheathing underneath is damaged, it will cost extra, up to $50 per sheet replaced. Some contractors charge for flashing chimneys ($150 - $300) and pipes ($25). All labor performed on steep pitch roofs (7/12 and higher) will be about 10% or 15% higher.