Barn 20 Metres South East of Hay Green Farmhouse

This is an early 17th-century barn, incorporating a fragment of a late medieval structure. It is located 20 metres south-east of Hay Green Farmhouse in Blackmore, Essex.

The barn is timber-framed and has been weatherboarded, with a roof of handmade red clay tiles. The main barn section has five bays, and a central midstrey facing south. Attached to the right end are two bays of a late medieval building, which may have originally been part of a two-storey domestic structure. Later, 19th and 20th-century single-storey buildings were added to the front left and rear right.

The original great doorway of the midstrey has been boarded over, with a fixed light and a plain boarded door. A dormer is visible in the catslide roof to the left of the midstrey. The rear wall contains the original great doorway, three high loading doors, and a halved door leading to the medieval section.

Inside the main barn are unjowled posts, heavy studding and girts, primary straight bracing, face-halved and bladed scarfs in the wallplates, cambered tie-beams with arched braces, and a queen post roof. Some studding below the girts has been replaced, with some areas bricked up to the girts. The left end wall is faced with red brick in Flemish bond to tie-beam level, with exposed studding on the gable. Some rafters have been replaced, reportedly due to damage during wartime. The cladding retains some hardwood weatherboards, mostly softwood.

The medieval section features jowled posts, heavy studding with curved braces trenched to the outside, girts, and jointing indicating the former presence of binding beams for the original floor. There are six diamond mortices and a square groove in the soffit of the tie-beam suggesting former unglazed windows with sliding shutters. It has cambered tie-beams with arched braces. The walls were raised by approximately 0.6 metres in the 18th century, with bladed scarfs in the wallplates, and the roof was rebuilt in a clasped purlin form to align with the main barn.

The 19th-century attached building on the front left is constructed of red brick in Flemish bond, with a roof of red clay pantiles. The barn is depicted on an estate map from 1832 and a highway diversion map from 1810.