The interior of Addington House is massive, kept mostly as a museum. The furniture is largely antique, and visitors are welcome to take a guided tour through the foyer, parlor, library, and dining room on the ground floor. The tour usually ends in the large ball-room at the back of the house with its massive antique piano, heavy velvet drapes, and elegant wood paneling. Throughout, the antique gas lights have been carefully changed to proper electric ones, but they've been selected to maintain the romantic quality, well-matched to the delicate lace curtains and polished antique furniture. Upstairs, extended tours lead through the master bedroom and period-maintained bathroom.
The rest of the upstairs has been converted to modern offices for the Addington family business, including one large boardroom and handsomely appointed office spaces for a half-dozen of the highest ranking members of the business.