The costs for metal roof and wall panels depend on type, finish, quantity and installation method, and can be found in RSMeans’ Building Construction Cost Data. According to the 2008 version of RSMeans Building Construction Cost Data, the cost to purchase and install metal wall panels is approximately $3.00 to $10.00 per square foot of wall area.

Many roofing and siding products are bought and sold by the square. One square is equal to an area that measures 100 square feet. This simple change in unit of measure could create a large error if the estimator is not observant.

Accessories necessary for a complete installation must be figured into any calculations for both material and labor.

Read more estimating tips for thermal and moisture protection.