Built 1762-3. The ground floor was originally used as a market, then converted into the police court. 2 storeys. 7 windows, the easternmost and westernmost ones slightly set back. Ground floor Portland ashlar above red brick with stone dressings. Stone modillion cornice and brick parapet with pediment, above the 3 easternmost windows of the non-recessed portion. Cupola of 8 Ionic columns supporting a small dome surmounted by a gilded ball and weather vane. 1st floor windows in stone architrave surrounds with pediments over, alternately triangular and curved. Large round-headed windows on the ground floor flanked by pilasters, with a stringcourse above the ground floor. 2 round-headed doorways with large semi-circular fanlights and doors of 6 moulded panels. The east end of the building forms a canted bay of 3 windows.
The Council Chamber contains a fine Rococo painted ceiling and drops of musical instruments on the wall by Galli and Cotti. 2 C18 pedimented overmantels, and 6 fielded panelled doors. There are also 2 large cells with graffiti carved by the prisoners.
This was used as a prison before the prison along Boxley Road was built and incorporates timbers from an earlier timber-framed building on the site.