Functional, attractive, slip-resistant, and stain-resistant, slate tiles can be a terrific natural stone flooring option for kitchens, bathrooms, and foyers. Basic slate tiles typically cost from $1 to $5 per square foot. High-quality or designer slate tiles range from approximately $5 to $25 per square foot. Mosaic slate tiles typically cost from $5 to $30 per square foot. Professional installation for slate tiling increases the price per square foot from around $5 to around $20 per square foot, depending upon the type of tile. Like other natural stone tiles, slate tiles do require some periodic maintenance to keep its shine and luster.