- Building type: Mill
- Date of construction: 1853
- Architect: W.H. Lynn
- Listing: B+
- HB/SMR Ref: HB10/07/004
- 2nd Survey by EHS: Yes
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Herdmans Mill, Mill Avenue, Sion Mills, BT82 9HE
County Tyrone
Main mill building. Four storey Classical style, 16 bays long with extensions. Segmental headed windows along ashlar frontage. South-West corner Italianate stair tower. Cornice at roof level. Pitched slate roof
| Stone Type Category: | Buff-Pink Sandstone |
| Primary Stone Type: | Tyrone Carboniferous Sandstone |
| Secondary Stone Type: | Local Dalradian Schist (Tyrone) |
| Other Stone Type: | |
| Replacement Stone Type: | |
| Stonework Construction: | Regular-coursed tooled ashlar |
| Stonework Condition: | Sandstone blockwork is in reasonable condition but with some evidence of isolated stone block deterioration and surface loss through scaling, flaking and granular disintegration. Heavy soiling |
| Condition Assessment (QUB): | 2 |
