Mill House is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 17 June 1966. House.

Mill House

WRENN ID
lost-finial-bramble
Grade
II
Local Planning Authority
Snowdonia National Park
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
17 June 1966
Type
House
Address
Mill House, Tal-Y-Bont, Dyffryn Ardudwy, Gwynedd
OS grid reference
SH 588 218
Coordinates
52.77544, -4.0933
Source
Cadw listing

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

Description

This is a two-storey mill house, likely dating to the 18th century, constructed of roughly coursed boulder stone with large stones serving as quoins and lintels. The main range has a roof of small slates, with more recent slates on the rear wings. The main house has a three-window front with tall stone stacks at each end; the stack on the right (southwest) gable is particularly broad and external, both having dripstones and capping. To the left (northeast), the range continues as a two-window range, with stone copings at the northeast gable, likely representing a converted stable or cowhouse as documented in a 1966 listing description. Both parts of the main range are accompanied by rear wings, and a later lean-to addition connects them to form a porch. A modern conservatory has been added against the southwest wall of the rear wing of the main house.

The main house features three windows evenly spaced across the front, with a central doorway. The ground-floor openings are topped with large, rough stone lintels, and the windows are tall. The outer first-floor windows are set within gabled half-dormers that break the eaves line, while the central window is a small, two-paned light directly below the eaves. A single ground-floor window is located to the right of the external stack at the southwest gable. The rear wing is set back from this gable, with a modern conservatory built into the angle. The rear wing is probably contemporary with the main house and has a broad gable stack with capping and a single first-floor dormer breaking the eaves line along the southwest wall.

The two-window range to the left has widely spaced openings and a doorway at the right end, sheltered by a timber porch; the first-floor windows are within raking dormers. A further doorway is present in the northeast gable, accessed by a flight of three stone steps. The rear wing of this section has a modern roof with two gabled dormer windows along the northeast pitch, a doorway positioned directly below a window on the right side, and Velux windows along the rear (southwest) pitch of the roof.

The lean-to addition connecting the two ranges has a low rubble wall and timber doors and windows, all under a slated roof. The doors and windows throughout the range are modern timber replacements for earlier metal-framed casements.

The building is constructed of stone with a slate roof and stone stacks. The windows are a mix of sashes and casements, with upper windows set within gabled projections. The interior has been modernised and lacks noteworthy original features.

Local climate

Mill House sits in one of the wettest parts of the UK, with an average of 1,460 mm of rain a year. This makes it wetter than 98% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 96% of listed buildings.

It experiences an average of 31 freeze-thaw cycles a year, fewer than 62% of listed buildings. Of these, 14 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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  • No EPC on record for this property
  • Sale history — 1 transaction since 2000
  • No related consent applications matched
  • 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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  5. Milepost Grade II 372 m
  6. Church of St. Dwywe Grade II* 577 m
  7. Entrance gates, piers and walling at Cors y Gedol Hall Grade II 583 m
  8. Lofted stables and cartshed range at Llanddwywe Farm Grade II 586 m
  9. Llanddwywe Farm Grade II 597 m
  10. Ty Llwyd Grade II 1.1 km