- Building type: Castle
- Date of construction: 11th Century
- Architect: Not Assigned
- Listing: MON
- HB/SMR Ref: ANT041:003
- 2nd Survey by EHS: No
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Portmuck Castle, Portmuck
County Antrim
Stump of castle gatehouse with barrel vault approximately 6m x 6m
| Stone Type Category: | Basalt |
| Primary Stone Type: | Basalt |
| Secondary Stone Type: | Antrim Chalk |
| Other Stone Type: | |
| Replacement Stone Type: | |
| Stonework Construction: | Coursed rubble |
| Stonework Condition: | Standing basalt stonework is in good condition but some chalk detailing shows evidence of deterioration with surface disintegration resulting in loss of architectural detail. |
| Condition Assessment (QUB): | 1 |
