Richard Davis Coan built the house at 15 Fair Street in Guilford around 1841. He married Flora Hitchcock Granniss. Richard Coan is described in New England Families, Genealogical and Memorial, Vol. III (1913):
He spent the greater part of his life in the place of his birth, and being a builder by occupation erected many houses and public buildings there. Later he removed to New Haven, where he was actively engaged in the building business, a member of the lumber and manufacturing firm of Lewis & Beecher Company, who conducted large planing mills, and was one of the leading industries of the city. He was known by the title of major, commanding the Guilford troops on muster day. He was very prominent in the work of St. Paul’s Episcopal Church, and later in the Church of the Ascension, and being a musician of note was active in the choirs of both churches. After his removal to New Haven. Mr. Coan built a fine residence on Wooster street, which was at that time the finest residential section of the city.
The house in Guilford was later owned by Beverly Monroe, who ran a store on Boston Street established with his father and brother.