Clock House at Hamper Mill is a Grade II listed building in the Three Rivers local planning authority area, England. First listed on 3 October 1985. Former wheel house.
Clock House at Hamper Mill
- WRENN ID
- shifting-jamb-myrtle
- Grade
- II
- Local Planning Authority
- Three Rivers
- Constituency
- South West Hertfordshire MP: Mr Gagan Mohindra (Con)
- Country
- England
- Date first listed
- 3 October 1985
- Type
- Former wheel house
- Address
- Clock House at Hamper Mill, Hampermill Lane, Watford Rural
- OS grid reference
- TQ 097 939
- Coordinates
- 51.6339, -0.41555
- Source
- Historic England listing
Description
The Clock House at Hamper Mill is a former wheel house for a paper mill, now incorporated into a dwelling. It dates from around 1800 and has been altered in the 20th century. The building is constructed of brick with stone dressings and features a hipped slate roof. It has five bays and two storeys. The central doorway is framed by a chamfered rusticated stone surround with a four-centred arch. There are 20-pane cast-iron fixed windows on either side and on the first floor, with the central window on the first floor being blind. The building has chamfered stone quoins and a timber clock tower in two stages, topped with an open bell turret and weathervane. At the right end, there is a section of the original mill building's wall. The rear has undergone 20th-century alterations. The Hamper Mill operated for the manufacture of paper from 1776 to 1908, and this structure was likely built after a fire in 1793.
Local climate
Clock House at Hamper Mill 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 93% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 91% of listed buildings.
It experiences an average of 30 freeze-thaw cycles a year, fewer than 65% of listed buildings. Of these, 13 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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- No EPC on record for this property
- No sale records on file
- No related consent applications matched
- 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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