Duncan Seawall Dock & Boat Lift is a full service marine construction company that focuses on the individual building needs of each customer we serve. From large commercial marinas to residential docks, our knowledgeable employees will take care of your needs – from permits to clean up. As one of Southwest Florida's largest marine contractors, Duncan Seawall offers a complete line of waterfront structures and dredging services which can be seen throughout Sarasota, Manatee, Charlotte, Pinellas and other surrounding counties. Our success is attributed to our commitment to quality workmanship and unsurpassed customer service.