Monnow Mill is a Grade II listed building in the Monmouthshire local planning authority area, Wales. First listed on 15 August 1974. Mill. 1 related planning application.

Monnow Mill

WRENN ID
waiting-garret-nightshade
Grade
II
Local Planning Authority
Monmouthshire
Constituency
Monmouthshire MP: Catherine Fookes (Lab)
Country
Wales
Date first listed
15 August 1974
Type
Mill
Address
Monnow Mill, Osbaston, Monmouth, NP25 3AX
OS grid reference
SO 507 135
Coordinates
51.81801, -2.71623
Source
Cadw listing

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

Description

Monnow Mill is a building of group value, likely dating to the 18th century, constructed primarily of local rubble stone with some ashlar detailing and covered by a Welsh slate roof. The building is largely obscured by creeper on its main road-facing elevation, which limits the detail that can be observed. The structure is two storeys and an attic, with a lower basement level that housed mill machinery, although this level is separate from the residential section of the building. Windows are irregularly placed and mostly late 20th-century hardwood casements. A late 20th-century gabled porch shelters the doorway on the right-hand side, leading to a late 20th-century door accessed by a flight of steps. The steeply pitched roof has a stack positioned at each gable. A small, single-storey wing was added to the right-hand gable in the late 20th century. The garden elevation was not visible during a resurvey in June 2004.

The mill sits on the east bank of the River Monnow, at a point where the river is quite steep. A nearby weir, now damaged, once supplied a water wheel located on the river’s west bank. The interior of the mill was not inspected during the 2004 resurvey.

Local climate

Monnow Mill receives an average of 820 mm of rain a year. This makes it wetter than 52% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 57% of listed buildings.

It experiences an average of 42 freeze-thaw cycles a year, more than 80% of listed buildings. Of these, 19 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.
  • Sale history — 2 transactions since 1997
  • 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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