Mine offices at Llywernog Mine

Mine office building, coursed squared local sandstone with yellow brick dressings and hipped slate roof. Small yellow brick right end chimney. Two-storey, seven-bay front with brick quoins. The five centre bays are close-spaced with 16-pane windows above three broad doors alternated with two similar windows. Windows have small panes in fixed or tilting lights, slate sills, yellow brick cambered-headed surrounds with rusticated jambs. Board doors in similar surrounds, the right door split as stable door. Right bay has broader 16-pane window over square 20-pane window, left side has taller doorway with small brick-framed blank roundel over. Left end adjoins wheel-pit for 50' (15.25m) wheel (listed with crusher-house). Right end wall has raised chimneybreast. Rear is built into the slope and has two first floor doorways and a small roundel to right. Three C20 skylights in roof.

Interior restored as museum. Smith's hearth at E end.