Gelmast Farm including attached dairy and cowhouse, cartshed and stable, and yard wall.

Gelmast Farm is a late 19th-century farmstead comprising a house, agricultural buildings, and a yard enclosed by walls. The two-storey farmhouse has a three-bay main block, with a service range to its right, set slightly back and lower. The main house is built of painted stucco with slate eaves and large rendered chimneys at each end. A rear outshut is present. The windows are late 19th-century four-pane horns, with the central upper window slightly misaligned with the front door. The front door is also late 19th century, with glazed upper panels and a small overlight. The service range has a 20th-century door positioned slightly left of centre, and two six-pane horned sash windows on each floor, the right-hand windows being wider. A 20th-century brick chimney is located to the right. Projecting from the rear of the service range is the dairy, originally freestanding, featuring a hipped slate roof (formerly pyramidal). It has a pair of large 12-pane casements to the east (one missing two panes in 2004), a smaller 12-pane casement to the north, and evidence of blocked openings. The rear of the house has two doors and a window at each end within the outshut.

Attached to the west (left) of the house is a three-bay Dutch barn or cartshed with stone piers, a corrugated roof, and doors. Beyond this is a plain rubble stone block, possibly originally a lofted stable, with a slate roof and a blocked front door. A broad door and a loft door are found in the left gable. Attached to the east (right) of the house, at a right angle to the service range, is a long cowhouse built of rubble with a slate roof. The north-east corner is hipped, and the south gable has been partially rebuilt in brick. The front of the cowhouse features a window, a door, a window, and a small window. A rubble wall extends from the south end of the cowhouse, dropping in height and terminating in a gatepier to the west, partially enclosing the south side of the yard. This wall is attached to the barn.

The house has a central stair passage with a wooden stair featuring stick balusters. A room to the left contains a Victorian-style fireplace. Service rooms are located to the rear in the outshut. A kitchen range has a wooden stair against the rear wall. The main block of the house has, on the upper floor, one beam with run-out stops and rough, boxed-in beams. A Victorian iron fireplace is in the west wall. The kitchen block has matchboard partitions. The main (west) section of the house and outshut have pegged roof trusses, while the east (kitchen range) has bolted, later trusses. The dairy has a plastered ceiling, slate-slab work surfaces, and a slate-paved floor. The roof structure is intact, retaining a central A-frame truss which supported the former pyramidal roof. The cowhouse has nine bays of pegged trusses and remains of a wooden feed passage partition to the west. The cartshed to the west has modern roof trusses, and the end building has one later bolted roof truss. There is no loft floor.