No 20 and Mill at Rear is a Grade II listed building in the Northumberland local planning authority area, England. First listed on 25 August 1977. A C19 Industrial mill. 2 related planning applications.

No 20 and Mill at Rear

WRENN ID
grey-rubblework-sage
Grade
II
Local Planning Authority
Northumberland
Constituency
North Northumberland MP: David Smith (Lab)
Country
England
Date first listed
25 August 1977
Type
Industrial mill
Address
No 20 and Mill at Rear, Dispensary Street, Alnwick, NE66 1LN
OS grid reference
NU 183 133
Coordinates
55.41343, -1.71117
Source
Historic England listing

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

Description

No 20 and the mill at the rear is an 18th century building with an 'L' plan, primarily constructed before 1851. It features a four-storey block with six windows on the north side, four on the south, and two on the east. The structure is built from rubble with quoins and dressings. It has glazing bar sash windows, with Yorkshire sashes on the south and east sides for the first three floors. On the ground floor, there is a large round-headed arch on the south side and a smaller arch on the east side, with another arch above it on each floor. Additionally, there is a two-storey extension with one window and a two-storey gable end fronting the street (No 20), along with a lean-to extension to the west.

Local climate

No 20 and Mill at Rear receives an average of 830 mm of rain a year. This makes it wetter than 53% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 58% of listed buildings.

It experiences an average of 13 freeze-thaw cycles a year, fewer than 88% of listed buildings. Of these, 8 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 — 2 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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