The Costs. Minimum cost of Terracotta roofing tile: $6 per square foot. Maximum cost of Terracotta roofing tile: $15 per square foot. As is stated above, the minimum cost of terracotta tiles is set at around $6, while the maximum costs are around $15 per square foot.hese strips of wood are priced at anywhere from $3-$5 per square foot. Pretty much the only other materials needed for the installation of terracotta roofing tile will be the hammer and nails that will be used to secure the tiles in place. These can be found at any local hardware store.