The current building, originally the north-west wing of a larger complex, was built in 1846 by architect Edward Blore.

It is built in red brick with stone dressings and plain tiled roofs.

It comprises 2 storeys plus attic in the Jacobean style with a 5-bay frontage surmounted by 3 dormer windows.

[3] Other listed 19th-century features of the estate include the shellhouse, a brick-built garden house by Edward Blore whose interior is faced entirely with seashells; the lodge, a one-storey building with a Greek-cross plan; and the brewery, now used as garages.

Merton Hall was built in 1613 on the site of a house which had been in possession of the de Grey family since the middle of the 14th century, and prior to that of their ancestors in the female line, the Baynards, to whom the property was granted at the time of William the Conqueror.