4 and 6 Thorngate and attached Rear Wall, Barnard Castle (Barnard Castle) - Source of Reference
| No. | Originator(s) | Date | Title | Notes |
|---|---|---|---|---|
| 1 | Department of Environment, English Heritage, Historic Buildings and Monuments Commission | 1950 | List of buildings of special architectural or historic interest, also known as "Greenbacks" | LB Volume, Map & Item: 770-1, 5, 209 |
| 2 | Durham County Council | 4 & 6 Thorngate | ||
| 3 | Durham County Council | 4 & 6 Thorngate | ||
| 4 | Durham County Council | 6 Thorngate - Bay window detail |