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REFF DEVELOPMENT is a full-service construction firm serving the Thousand Islands and Watertown, NY Area, specializing in home building, renovations, foundations, excavation, roofs, decks, and garages, and light commercial work. With over 25 years of experience, Mark Reff and his team work closely with clients to deliver quality results on time and on budget. From start to finish, REFF DEVELOPMENT takes pride in providing a personalized experience for each client.