Flamstead House is a Grade II listed building in the Dacorum local planning authority area, England. First listed on 19 March 1987. House.
Flamstead House
- WRENN ID
- ghost-steel-bistre
- Grade
- II
- Local Planning Authority
- Dacorum
- Constituency
- Harpenden and Berkhamsted MP: Victoria Collins (LD)
- Country
- England
- Date first listed
- 19 March 1987
- Type
- House
- Address
- Flamstead House, River Hill
- OS grid reference
- TL 079 148
- Coordinates
- 51.82228, -0.43521
- Source
- Historic England listing
Description
Flamstead House is a large house with a rear wing and kitchen dating back to the 18th century or earlier. The main front block was built in 1782, as indicated by the inscribed stone plaque: "FLAMSTEAD HOUSE / The East front / Erected by / JOHN COLLINS / in the year 1782." An S wing was added in the early 19th century. The house underwent extensive alterations in the 1920s, including the addition of bay windows and roughcast rendering to the E front.
The house is L-shaped, facing East. It consists of a tall, single-storey rear kitchen wing, a two-storey front block, a two-storey extension in the NW angle forming a dining room, and a long two-storey S block facing W into a rear yard. The symmetrical front block is three windows long, with a central entrance on the E side. It features recessed sash windows with 6/6 panes and a stucco plinth. A 30cm square stone tablet is located near the S end. A Greek Doric porch with two columns, a full entablature, and a low-pitched triangular pediment stands over the entrance. The doorway is supported by minor order details, and features an architrave above a three-light fanlight with rounded corners. The entrance has two four-panel doors. A flat soffit runs along the eaves.
The long range to the S has a two-storey half-octagonal bay window with small-paned casements, and a brick lean-to. A similar two-storey bay was added to the N end of the front block, also featuring casements and a parapet. The two-storey, three-windowed dining room extension facing N has three French windows and sash windows to the first floor with 6/6 panes.
The S side of the rear wing has two recessed sash windows with 6/8 panes on the first floor. A 18th-century six-panel fielded door, with a lean-to slated porch supported by two heavy Greek Doric columns, is located to the left of a triple sash window under a deep red brick gauged arch with 1/2:4/8:1/2 panes. A single-storey, tall kitchen is located to the W of the cross-passage and features a door. Outside the N door of the passage is a shelter over a well with a large iron steam-pump.
The formal W front to the S wing is five windows long, constructed from red and grey brick with flat arches over sash windows with 6/6 panes and plastered reveals. A triple sash window with a 1/2:4/8:1/2 pane arrangement is located on the ground floor at the left. The S gable end has corner pilasters and a projecting central chimney with two round arched recesses and two three-light casement windows.
Local climate
Flamstead House sits in a drier-than-average part of the UK, with an average of 730 mm of rain a year. This makes it drier than 80% 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 33 freeze-thaw cycles a year, fewer than 53% of listed buildings. Of these, 16 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.
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- No EPC on record for this property
- No sale records on file
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- Detailed attributes — period, style, materials, features
- Flood risk assessment
- Radon risk assessment
- Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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