The Old Mill House Museum and Mill Green Mill is a Grade II* listed building in the Welwyn Hatfield local planning authority area, England. A C17 Museum and mill. 6 related planning applications.

The Old Mill House Museum and Mill Green Mill

WRENN ID
grey-lintel-river
Grade
II*
Local Planning Authority
Welwyn Hatfield
Constituency
Welwyn Hatfield MP: Andrew Lewin (Lab)
Country
England
Type
Museum and mill
Address
The Old Mill House Museum and Mill Green Mill, Bush Hall Lane, AL9 5PD
OS grid reference
TL 240 097
Coordinates
51.77292, -0.20418
Source
Historic England listing

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

Description

The Old Mill House Museum and Mill Green Mill is a mill and house that dates from the 17th century and earlier. The west side features a timber frame with a red brick casing, while the east side is primarily red brick from the 19th century, with some 17th-century framing. The building is a single block with lower sides and a stream running underneath. It has two storeys and plain tile roofs, which are hipped at the west end. There are two gabled attic dormers in the center, and the left side projects forward with a floor band. The west elevation includes a floor band and three small gable ends. The windows are glazing bar casements on the ground and first floors. Inside, there are chamfer stopped floor beams. The right side features recessed casements and a parapeted east gable end. The central part of the mill has two-storey plank doors and Yorkshire casements on the first floor, left of center. The mill mechanism is intact and dates from the 18th century or early 19th century.

Local climate

The Old Mill House Museum and Mill Green Mill sits in a drier-than-average part of the UK, with an average of 720 mm of rain a year. This makes it drier than 85% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 81% of listed buildings.

It experiences an average of 32 freeze-thaw cycles a year, fewer than 58% of listed buildings. Of these, 15 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.
  • No sale records on file
  • Related listed building consents — 6 applications
  • 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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