Large Format Porcelain Group specializes in Granite, Porcelain, and Marble countertops. We can meet your home improvement, kitchens, fireplaces, and Tile needs. New Construction. Custom work available by request. All jobs large and small. Give us a call Today! We have over 20 years of experience. Serving the Greater Chicago area: Lake County, North Shore, South Shore, Highland Park, North Brooke, Glenview, Glenco, Deerfield, Riverwoods, Wilmette, and Winnetka areas.