Water Mill Building Supply is the Hamptons most convenient one-stop-shop for hardware, lumber, paint, windows/doors, millwork and high-end design hardware, kitchen, bath and flooring. It’s also Long Island East End’s largest True Value hardware store. Water Mill Building Supply is a part of Trade Supply Group, which owns and operates a number of best-in-class building supply distributors. Water Mill Building Supply Contact Information: Email: info@wmbs.com Phone: (631) 726-4493