Ty Tan-y-Derwen

Ty Tan-y-Derwen is a farmhouse dating from the 16th or 17th century. It is timber framed with colourwashed infill panels and has a slate roof. The building has one storey and an attic, consisting of three bays and follows a Type C lobby-entry plan. It is made up of two sections, with the main stack positioned on low stone sill walls at the rear and the two bays to the left of the stack set on a higher stone sill. There is a weatherboarded outbuilding at the left end, which includes a cart house, and a single-storey outbuilding over a secondary entrance on the right gable. An outshut framed in timber is present on the left build.

The farmhouse features a gabled open porch with a shaped doorhead, wide arch sides, and a central pendant, although it is now enclosed with boarding. There is a boarded door and the framing consists of four small panels high. The east gable jetties on four corbels, two of which are carved with simple masks. The windows are three-light panes, with a gabled dormer to the left of the porch and a window beneath the left jetty. One window retains its original moulded applied sill, which has been replicated on others, and most windows are topped with an applied bracketed hood board. The significance of the two builds is unclear, but the parlour end may have been rebuilt in the late 17th century to provide higher quality accommodation with a more impressive gable end.

Inside, the main living hall to the left of the entrance has a ceiling divided into six compartments by chamfered beams, with the rear compartment containing the stair. A post and panel partition separates this room from an inner room, which appears to have been altered to enlarge the inner space, retaining the post while the division wall has been removed. The parlour, now functioning as the kitchen to the right of the entrance, features two parallel chamfered spine beams. The fireplace on this side of the major stack includes a bread oven on the back wall. The roof trusses have struts from tie to collar, marked with a chisel, and show mortices for windbraces to the purlins, along with a central cruck truss in the living hall.