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Confidence votes 713. 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.
Local labor and material costs and the difficulty of the installation can result in significant price differences. 1  Standard 3 tab asphalt shingles installation costs approximately $2.50 to $4.50 per square foot. For a roof measuring 1,500 square feet, the total cost might be around $3,750 to $6,750. At this price, you can expect a warranty of approximately 20 to 30 years. Architectural roof shingles cost approximately $5 to $10 per square foot installed, or roughly $7,500 to $15,000 for a 1,500 square foot roof. These higher quality asphalt shingles should come with a 40 year warranty.