The average residential or commercial asphalt roof in San Antonio, Texas will cost between $3.27 – $5.73 per square foot and up. A standing seam metal roof will cost between $7.21 – 11.79 per square foot. The price varies depending on the square footage of the roof, layers of felt, layers of shingles, steepness, access to property etc. Keep in mind that the livable square feet and roof square feet are completely different, on average, the roof has about 37% more sqft. The real price answer is: It depends. Yup, it depends on all variables listed above, the property’s unique needs, materials and warranties you want.