The following text is from the original listed building designation:
1. 944 NORTHGATE (North West Side)
St Mary Northgate Hall (Formerly listed as St Mary's Church) TR 1558 SW 3/146A 3.12.49.
II GV
2. Originally St Mary's Church. Now the church hall of the Parish of St Gregory the Great. The front elevation is buff brick circa 1830 having 2 arched windows with stone suruounds. Roof has 2 gables arid 4 obelisk-shaped finials. Plinth. The side elevation is of buff brick with 4 round arched windows. Plinth. At the rear there is a 4 storey red brick C17 tower with stone coping and 1 window round arched, round or lunette. Later door inserted in arch, To the left of this is a one storeyed portion of red brick with grey headers. 3 casements, and a simple doorcase. The North wall of the church hall, which continues the line of the City Wall, is mediaeval and has mediaeval wall paintings on its inner face and some ancient glass.
Nos 72 to 74 (consec) and St Mary Northgate Hall form a group. Also forms a group with Nos 1 to 4 (consec) and Nos 7 to 21 (consec) The Borough.
Listing NGR: TR1510258184

English Heritage, List of Buildings of Special Architectural or Historic Interest (Map). SKE16160.