Founded in 2000, Complete Basement Systems is the go-to contractor in all of Long Island for basement waterproofing, repair and remodeling. Our services also include spray foam joist insulation, sump pump -- and we work wonders with wet crawl spaces, too! Regardless of what you’d like done with your basement, we can help. We are affiliated with Basement Systems®, an international network of over 300 basement contractors. As a Basement Systems dealer, we have access to the latest waterproofing techniques and basement remodeling products – many of which are patented and proprietary.