Hay Farm House is a Grade II listed building in the North Hertfordshire local planning authority area, England. First listed on 27 May 1968. House.

Hay Farm House

WRENN ID
rusted-mullion-amber
Grade
II
Local Planning Authority
North Hertfordshire
Constituency
North East Hertfordshire MP: Chris Hinchliff (Lab)
Country
England
Date first listed
27 May 1968
Type
House
Address
Hay Farm House, Police Row, Therfield
OS grid reference
TL 336 371
Coordinates
52.01676, -0.05362
Source
Historic England listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

Hay Farm House is a house dating from the 16th century, with extensions from the 17th century and further alterations in the 19th century. It features a timber frame construction with roughcast and a tiled roof. The building has a four-bay hall range with two wings extending to the rear, originally possibly forming a half H shape. A cross wing was added to the left, and a 19th-century bay was added to the right. The house is two storeys high.

The entrance front has a unified appearance from the 19th century, with a recessed door to the right of the hall range, which includes a hooded architrave. On the ground floor to the left, there are two oriels with horizontal sliding sashes, while the first floor has two three-light horizontal sliding sashes. The eaves are moulded, leading to a steeply pitched roof behind.

The left gable-fronted wing has an entrance and features two and three-light casements, with exposed purlins in the gable and a slightly lower ridge. There are early cross axial stacks between the hall and the rear wing on the right, as well as at the left end where it meets the later wing, which has been partially rebuilt. The left end has a lean-to outshut made of red brick facing the road. The 19th-century bay on the right includes a ground floor oriel and a first floor three-light horizontal sliding sash, with coved eaves leading to a separate roof that has a taller ridge.

At the rear, the left gable-ended wing projects from the 19th-century bay, maintaining the ridge height of the main range. It features small-pane horizontal sliding sashes and a three-light leaded pane casement, with a brick lean-to added on the left end. There is a catslide roof over a continuous lean-to outshut at the rear of the hall range. Extending to the rear right of the hall range is a large two-bay wing with a gable at the rear. The ground floor is later brick with small casements, and there is a moulded bressumer supporting a jettied first floor that has a small-pane horizontal sliding sash and two-light casements in the returns, along with a brick lean-to on the left return. The later wing to the rear right has exposed purlins in the gable and a lean-to outshut addition.

Inside, there is a 17th-century panelled room and staircase.

Local climate

Hay Farm House sits in one of the driest parts of the UK, with an average of 700 mm of rain a year. This makes it drier than 91% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 77% of listed buildings.

It experiences an average of 35 freeze-thaw cycles a year, more than 59% of listed buildings. Of these, 17 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

More on this building

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