- Building type: Church
- Date of construction: 1731
- Architect: Welland & Gillespie (LA)
- Listing: B+
- HB/SMR Ref: HB10/02/001
- 2nd Survey by EHS: No
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Derg Parish Church (St. Cone's), Main Street, Castlederg
County Tyrone
Gothic style hall church with square tower to front, all rendered. Rubble stone projecting chancel and Northern gabled aisle, 5 bays long with semi-circular arch windows. Vestry on NE corner. Tower Classical aediculated with free-standing Tuscan columns and high open pedimented doorway. Pitched slate roof
| Stone Type Category: | Schist |
| Primary Stone Type: | Local Dalradian Schist (Tyrone) |
| Secondary Stone Type: | Tyrone Carboniferous Sandstone |
| Other Stone Type: | Giffnock Sandstone |
| Replacement Stone Type: | English Carboniferous Sandstone |
| Stonework Construction: | Random-coursed squared rubble |
| Stonework Condition: | Schist is in reasonably good condition with fragmentation of isolated blocks only, dressing is also in good condition with mild granular disintegration and occasional flaking only |
| Condition Assessment (QUB): | 1 |
