20 Allergate, Durham City (Durham City) - Source of Reference
| No. | Originator(s) | Date | Title | Notes |
|---|---|---|---|---|
| 1 | Department of Archaeology Durham University | 1991 | Urban Archaeological Database | |
| 2 | Department of Archaeology Durham University | 1988 to 1991 | Durham City Archaeological Conservation Management Project Archive | |
| 3 | Bonney, M M | 1985 | The development of a northern town in the later Middle Ages: the City of Durham | |
| 4 | Archaeological Services Durham University, Armstrong, J, English Heritage | 01-Jan-2010 | Durham City medieval secular buildings assessment project | p 48 ref A2 |
| 5 | Ryder, P | 1991 | Buildings Survey, 1990-1991 | p 3 |
| 6 | Ryder, P | 11-Dec-1990 to 25-Feb-1991 | Durham Buildings Survey - Fieldbook 2 | p 121, 127 |
| 7 | Durham County Council | Jul-2016 | Conservation Area Appraisal: Character Area 3, Crossgate (Durham City) | page 255 |
| 8 | 23-Jun-2021 | City of Durham Parish Council Durham City Neighbourhood Plan 2020 to 2035 | page 143 | |
| 9 | Private Individual | 14-Jan-2022 | 20 Allergate, Durham City, Local Listing Form and 4 Photographs | |
| 10 | Local Heritage List, Durham City, April 2023 | Page 7 |