Located on Main Street in Old Saybrook is an octagon-shaped house known as the Ingham House. It was a prefab building, said to have been purchased from the Sears and Roebuck Catalogue around 1890. The attribution to Sears and Roebuck is open to question, because a number of online sources indicate that the company only began offering kit houses in 1908, and apparently such homes were only available in the United States starting around 1906. So the origins of the house must be considered as still undetermined. The building, which is not a completely symmetrical octagon, has been extensively remodeled to become a dentist’s office.
Addendum: The house was constructed by Horace Archer and was the residence of Robert Burns for many years. Robert Burns was a partner in the nearby Burns and Young store on Main Street. His daughter, Mary Burns, lived in the house and was postmistress for many years.