Hamper Mill House is a Grade II listed building in the Three Rivers local planning authority area, England. First listed on 3 October 1985. House. 1 related planning application.

Hamper Mill House

WRENN ID
twisted-corbel-nightshade
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
House
Address
Hamper Mill House, Hampermill Lane, Watford Rural, WD19 4PL
OS grid reference
TQ 097 939
Coordinates
51.63355, -0.4155
Source
Historic England listing

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

Description

Hamper Mill House is a house built in the late 18th century, with extensions added in the late 19th or early 20th century. It is constructed of red brick and features a hipped tile roof. The building has two storeys and a partially obscured basement. Originally, it had four bays, but it has been extended by one bay to the left. The entrance is located in the second bay from the right and consists of a panelled door with a semi-circular traceried fanlight set in an arched reveal. The windows are glazing bar sashes in shallow reveals with gauged brick flat arched heads, while the first floor has small six-pane sashes. A mutuled timber eaves cornice runs along the top. There is a cross axial stack at the original left end, and basement windows are present on the left side. The three-storey right return has 20th-century alterations, including a large canted bay window on the first floor. The left return and rear have a mix of scattered sashes and casements. At the rear right, there is a large slightly extruded stack that adjoins The Old Cottage.

Local climate

Hamper Mill 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 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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  • Full EPC report — heating system, energy costs, size, glazing, construction etc.
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  • Related listed building consents — 1 application
  • 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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Nearby listed buildings

  1. The Old Cottage Grade II 7 m
  2. Hamper Mill Cottage Grade II 17 m
  3. Clock House at Hamper Mill Grade II 39 m
  4. Porters Lodge at Merchant Taylors School Grade II 490 m
  5. Merchant Taylors School Grade II 560 m
  6. Statue of Sir Thomas White at Merchant Taylor's School Grade II 578 m
  7. Oxhey Hall Grade II* 749 m
  8. Upland Court Grade II 1.0 km
  9. Barn on East Side of Yard at Northwood Preparatory School Grade II 1.4 km
  10. Moor Farm House at Northwood Preparatory School Grade II 1.5 km