Barn Workshops (Hertfordshire County Council) (30 Metres To North East Of Sunbury Hill Farm)

This building is a barn and cowhouse, now used as workshops, located 30 meters to the northeast of Sunbury Hill Farm. The barn dates from the late 17th century, while the cowhouse is from the early 17th century. It features timber frames set on renewed red brick sills and is covered in dark weatherboarding with steep old red tile roofs.

The barn is a tall five-bay structure with continuous side-aisles added, oriented east-west, and has projecting gabled porches on the north and south sides. Attached to the southeast corner is a lower six-bay cowhouse that runs north-south. The barn includes unjowled posts, mid-height rails that are tenoned in-line, long straight braces supporting cambered tie-beams, and inclined queen-post trusses with clasped purlins and diminished principals. There are face-halved bladed scarf joints in the wallplate over each post, and squint-butted scarf joints to the purlins. Angle ties are present in the porches. The roof extends over the rear contemporary aisles, with a single purlin supported by aisle ties fixed to the faces of the posts.

Inside, there are remains of an unusual raised threshing floor made of wide planks carried on irregular timbers, with carefully notched cross-battens in between, supported by cross timbers and red brick piers, as noted in a survey report by KLLHMS in 1978 before part of the floor was demolished. The older cowhouse features unjowled posts, curved braces to cambered tie-beams, and an inclined queen-post clasped-purlin roof, with face halved bladed scarf joints in the wallplate over the posts.