slate flooring cost per square foot
1 Installation: Installation for the various types of tiles increases in price per square foot as follows; basic slate tiles with installation cost from $6 to $13 and high-quality slate tiles with installation cost from $9 to $20. Basic slate tiles: Basic slate tiles typically cost from $1 to $3 per square foot. 2  High-quality slate tiles: High-quality and designer slate tile costs range from approximately $4-$10 per square foot. 3  Mosaic tiles: Mosaic tiles typically cost from $8 to $35 per square foot.