The Union Street Inn was first built as a residence on Nantucket circa 1770. The first recorded deed transfer appears in 1805 when Samuel Barrett, a goldsmith, sold the land and dwelling to John Narboth. There is no record of Samuel Barrett having bought the land or house in this part of town so he may have built it or moved it from another location.

The original structure was built as a double house and later converted to a single dwelling with a column in the middle of the stair hall replacing the earlier partition. The 2 1/2 story shingle building has six bays with a wide pilastered center doorway spanning two bays.

Some of the previous owners of 7 Union Street are of historical significance. Christopher Mitchell, who owned the house from 1819-1832, owned Christopher Mitchell and Company, a prominent Nantucket company that owned ships and dealt in oil, candle making, and ship parts. Edward C. Joy, who owned the house from 1859-1866, was a whaling captain. He mastered the 1833 voyage of the ship "Lydia" and the 1835 voyage of the ship "Constitution", both out of Nantucket.

The building was converted to an inn in the early 1920's and has operated continuously as an inn to this day.

7 Union Street, late 19th century	The firm of Joseph L. Calabrese, P.C. served as the Structural Engineer for Additions and Renovations to the historic inn located on the island of Nantucket.

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