Clingstone, an unusual and such a vintage, 103-year-old mansion in Rhode Island’s Narragansett Bay, survives through the love and hard work of family and friends. Henry Wood, the owner, runs the house like a camp where all skilled workers welcome. The Jamestown Boatyard hauls the family’s boats and floating dock and stores them each winter in return for a week’s use of the house in the summer.

Mr. Wood, a 79-year-old Boston architect, bought the house with his ex-wife Joan in 1961 for $3,600. It …