The Carriage House located behind the Museum was built in 2009 to house the restored Franklin Buggy Company buggy that had been used in King and Queen County for more than 100 years. Harnesses and other equipment used with a horse-drawn buggy are also displayed. The building also includes the interior facade of the Stevensville Post Office, closed a number of years ago, as well as post office furnishings and old stamped envelopes once mailed in King and Queen County. A commemorative envelope may be purchased at the Museum Shop.