There are several factors that can affect the cost of installing a green roof, such as type of roofing, roofing area, installation process, labor cost and several others. The list of roofing types may include, extensive roofing, intensive roof, semi-intensive roof, blue-green roof, bi-solar roof and several others. You can get free estimates from Big Texas Roofing and Solar for the installation of green roofing on your roofing system.