Castletown Drill Hall, Main Street, Castletown

Castletown Drill Hall was built in 1892 and underwent alterations by Sinclair Macdonald in 1901 and by Sinclair Macdonald and Son in 1936. This 2-storey, 5-bay building has an approximately rectangular plan and is designed in a Scots Baronial style. It currently serves as a community hall with flats, as of 2015. The listing excludes the southeast extension built in 1996.

The hall is constructed from squared rubble, likely sourced from the local Castlehill quarry, with both polished and stugged ashlar dressings. The principal southwest elevation features a crowstepped central gabled bay with a wallhead chimney stack. The outer bays include drum towers topped with bellcast conical roofs, adorned with distinctive fishscale slates and iron finials; the right tower's finial is a weathervane. A cill band rises over a recess in the central bay, where a plaque was once located but is now missing. The building has a mix of 2 and 4-pane glazing in timber sash and case windows, a roof covered in grey slates, and corniced chimney stacks with yellow clay cans.

Low boundary walls flank the west and east sides of the site, featuring decorative iron railings and corner piers topped with squat pyramidal capstones.

The interior, observed in 2015, retains some late 19th century details, including deeply moulded cornices in the hallway and drill hall. The hall has timber boarding, and a low viewing gallery remains, now glazed.