Llanmihangel Mill is a Grade II* listed building in the Neath Port Talbot local planning authority area, Wales. First listed on 9 September 1992. Mill. 1 related planning application.

Llanmihangel Mill

WRENN ID
grim-spindle-onyx
Grade
II*
Local Planning Authority
Neath Port Talbot
Constituency
Aberafan Maesteg MP: Stephen Kinnock (Lab)
Country
Wales
Date first listed
9 September 1992
Type
Mill
Address
Llanmihangel Mill, Margam, CF33 6RL
OS grid reference
SS 819 823
Coordinates
51.52772, -3.70356
Source
Cadw listing

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

Description

Llanmihangel Mill is a 3-storey mill built into the bank at the north end and adjoins a modernised farmhouse set at right angles to the south. Constructed of rubble sandstone, the east side is whitewashed, with a slate roof. The main range is orientated north-south, with a 2-storey wing extending west. The windows are 2-light casements with segmental stone heads. The east wall has three small windows to the top floor and four to the first floor; the leftmost window is larger and contains a late 20th-century window. The ground floor has one window with plain glazing and a doorway to the left. The west wall has one window to the top floor and one to the first floor, featuring a horizontal glazing bar. The west wing has a doorway with stable doors facing south into the yard, and a window in the west gable. A concrete stable block is attached to the west end. An open lean-to extends west from the side of the mill, facing the wing across the yard, and to its left is the jamb of a blocked doorway leading into the mill. The north end of the mill has a 2-light window, while the north side of the wing features two blocked ground-floor openings and a further blocked opening above and to the right.

A mill-race approaches the north end of the mill from the northeast in a stone-lined channel, turning at a right angle to enter the gable end under a segmental brick head. Water was fed to the top of the wheel at right angles to the wheel axis. The wheel is located within a stone-arched chamber below the gable end of the mill, which is open to the west, where the tailrace emerges. It is a pitchback type, constructed of wrought and cast iron with a timber shaft, by S F Kelly of Cardigan, and operated between 1870 and 1894.

The roof is built with bolted A-frame trusses in machine-cut timber and is likely a late 19th-century replacement. The attic floor retains a sack hoist pulley wheel and a grain bin. The first floor has three mill stones with vats clustered around a large central timber shaft carrying a spur wheel, made of iron with wooden gearing teeth; two small nuts drive from this. Belt drives and pulleys are fixed to the east and west walls. A wooden platform is located to the north. The top floor of the wing has a simple collar truss roof. The ground floor has a flagstone floor with wooden partitions across the north end and is said to contain remnants of a dresser.

Local climate

Llanmihangel Mill sits in one of the wettest parts of the UK, with an average of 1,220 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 95% of listed buildings.

It experiences an average of 23 freeze-thaw cycles a year, fewer than 76% of listed buildings. Of these, 9 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 2023
  • 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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