John Hartnett, owner of a Newburyport excavation business, replaced the duck hunters' camp on Plum Island that he lived in for 30 years with a house so meticulously designed, his architect calls it "a statement of John."

Revealed framing and shingles on interior walls give the house a rustic sensibility; the eucalyptus coffee table is by McCullough Wood Products; the black-lacquer and Italian-leather end table is a L'Origine limited edition. The sawhorse dining table and chairs are by Fox Brothers.