- Building type: Tower
- Date of construction: 1824
- Architect: Edward Miller
- Listing: B
- HB/SMR Ref: HB01/19/070
- 2nd Survey by EHS: No
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Gaol Tower, Bishop Street, Derry
County Londonderry
Octagonal tower, castellated with arrow slit detail and narrow windows. New entrance in Claudy Schist added on East face where previously attached to gaol
| Stone Type Category: | Schist |
| Primary Stone Type: | Derry Schist |
| Secondary Stone Type: | Barony Glen Sandstone (Dungiven) |
| Other Stone Type: | Claudy Schist |
| Replacement Stone Type: | Giffnock Sandstone |
| Stonework Construction: | Coursed squared |
| Stonework Condition: | Primary stonework is in good condition with no significant deterioration, sandstone dressing is in relatively poor condition with granular disintegration, scaling, face loss and resultant loss of architectural detail |
| Condition Assessment (QUB): | 2 |
