West Underdown Farmhouse

West Underdown Farmhouse is a farmhouse built around 1850. It features plastered stone rubble, possibly with some cob, and has stone rubble stacks topped with plastered brick. The slate roof is adorned with crested ridge tiles. The building has a double depth design facing southeast, with a central entrance hall and staircase. There are front and rear rooms on either side, all served by service end stacks. At the right end, slightly set back from the front, is a two-story integral outshot. The main house is two stories tall.

The exterior has a symmetrical three-window front with original 16-pane sash windows and a central doorway that still holds the original six-panel door with an overlight featuring margin panes. The roof is gable-ended. The outshot has a two-window front with 19th-century casements that include glazing bars, and the ground floor windows have iron security bars. The rear also features similar casements and a round-headed sash window for the stairs, which has Y-tracery glazing bars. Two sides of the rear service courtyards are enclosed by service buildings.

Inside, the farmhouse is well-preserved and retains much of its original joinery and details, including an open string stick baluster staircase with turned newel posts, a mahogany handrail, and a curtail step.