re slating a roof cost
1 A 1,700-2,100 square foot roof might cost $17,000-$84,000, depending on the location, the quality of the slate and the complexity of the installation process.2  Synthetic slate roof shingles are made from recycled rubber and plastic molded to resemble natural roof slates. Expected to last 50 years or more, a synthetic slate roof is more lightweight and easier to install, and doesn't damage as easily if walked upon. 2  Installing a synthetic slate roof runs around $7-$9 or more a square foot, or about $11,900-$18,900 for an average ranch house with a 1,700-2,100 square foot roof.