The original house, designed by an unknown architect, was two storeys high, 60 by 40 feet (18 m × 12 m) in area, with a low hipped roof containing a circular window. It is likely that the bricks were made on the property from the heavily clayed soil. The windows are double-hung with brick lintels and louvered wooden shutters. They are 12-over-12 sash on the main floor and 8-over-8 sash on the second. The front door has a moulded reveal and a semi-circular fanlight, with separate sidelights. Originally, the gate of the building extended to Queen Street, however the gates have been crowded back to the head of John Street. As was the custom at the time, The Grange was built in the middle of a hundred-acre park lot. It received the name "The Grange" after a family estate in England.