Gatcombe Mill is a Grade II listed building in the North Somerset local planning authority area, England. First listed on 1 November 1985. Watermill. 5 related planning applications.

Gatcombe Mill

WRENN ID
dim-flagstone-falcon
Grade
II
Local Planning Authority
North Somerset
Constituency
North Somerset MP: Sadik Al-Hassan (Lab)
Country
England
Date first listed
1 November 1985
Type
Watermill
Address
Gatcombe Mill, Long Ashton, BS48 3QU
OS grid reference
ST 522 700
Coordinates
51.42769, -2.68891
Source
Historic England listing

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

Description

Gatcombe Mill is an early 19th century watermill, now disused. It is constructed of limeworked rubble with brick window heads and pantile roofs, and retains cast and wrought iron and timber machinery. The west elevation has three storeys and six windows, all with segmental heads; some are 3-light casements, some are blank, and a door is positioned off-centre, repeated directly above. A large segmental-headed cast entry is located off-centre to the right, and the building has a hipped roof. A large lean-to is attached to the south elevation, and a single eaves window is present on the north side. The rear elevation, built into the hillside, shows two storeys with plain windows to the right and left of the entry sluice from the mill pond.

The interior is remarkably complete, featuring machinery including an overshot cast iron wheel with wrought iron buckets on the ground floor, adjacent to a pit wheel with applewood teeth and a great spurwheel with a 20th century guard. A stone nut with an intact lifting mechanism is also present. On the stone floor above are two stones with runs, an auxiliary shaft (now guarded), and water supplied through a cast iron launder with regulator. The second floor houses a sack hoist shaft and drum, with associated traps complete throughout, alongside various bins and an extractor fan.

Local climate

Gatcombe Mill receives an average of 850 mm of rain a year. This makes it wetter than 60% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 69% of listed buildings.

It experiences an average of 31 freeze-thaw cycles a year, fewer than 62% 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.
  • Sale history — 1 transaction since 2021
  • Related listed building consents — 5 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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