Dulais Isaf House is a Grade II listed building in the Neath Port Talbot local planning authority area, Wales. First listed on 25 February 2000. House.

Dulais Isaf House

WRENN ID
western-hearth-spring
Grade
II
Local Planning Authority
Neath Port Talbot
Constituency
Neath and Swansea East MP: Carolyn Harris (Lab)
Country
Wales
Date first listed
25 February 2000
Type
House
Address
Dulais Isaf House, Aberdulais, Tonna
OS grid reference
SS 775 992
Coordinates
51.67897, -3.77189
Source
Cadw listing

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

Description

Dulais Isaf House is a 2-storey house that forms part of a larger property known as Dulais Fach and Dulais Isaf House. The house features pebble-dashed walls with blind panels outlined in render and a hipped slate roof, which has a chimney stack at the right and an additional stack on the left side. The front of the house includes deep canted bay windows on the outer bays, with sash windows and a sill band on the upper storey. A central portico supported by two moulded Tuscan columns and a moulded entablature leads to a balcony, which has a replaced glazed door. The main entrance has an overlight and double half-lit panelled doors.

On the right side, there is a single bay with 12-pane sash windows on both storeys. The left end wall has two upper-storey sash windows and a lower left glazed doorway that has been inserted. At the left side, there is a 3-bay rear wing that is set back, featuring two sash windows on the lower storey and an added lean-to porch on the left side. The upper storey retains a sash window on the left, while the central window has been replaced with a small-pane window, and the right-hand window is boarded up. Behind the wing and the main house is Dulais Fach, which faces east.

Dulais Fach is the older of the two houses, built in the late Georgian style with three storeys and three bays. It has roughcast walls painted cream, a slate roof, and end roughcast chimney stacks. The central doorway, which has an added porch and a replaced door, is flanked by late 19th-century tripartite sash windows. The middle storey features 12-pane hornless sash windows, while the shorter upper storey windows are late 19th-century replacements located beneath the wall plate.

To the right side, there is a lower 2-storey service wing made of rubble stone with dressed quoins and a slate roof, which has stone ridge stacks positioned to the left of centre and to the right. The front wall has three windows, featuring segmental-headed 2-light small-pane casements, except for the lower left where a horned sash window has been inserted. The property has not been inspected.

Local climate

Dulais Isaf House sits in one of the wettest parts of the UK, with an average of 1,380 mm of rain a year. This makes it wetter than 97% 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 28 freeze-thaw cycles a year, fewer than 69% of listed buildings. Of these, 12 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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  • 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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Nearby listed buildings

  1. Dulais Fach Grade II 15 m
  2. 12 Dulais Fach Road Grade II 43 m
  3. Railway bridge on NE side of Railway Tavern Grade II 222 m
  4. Aberdulais Basin at the head of the Tennant Canal Grade II 224 m
  5. Pont Gam Grade II 246 m
  6. Aberdulais Viaduct (partly in Tonna community) Grade II 275 m
  7. Aberdulais Aqueduct (partly in Blaenhonddan community) Grade II* 275 m
  8. Aberdulais Viaduct (partly in Blaenrhonddan community) Grade II 319 m
  9. Aberdulais Aqueduct (partly in Tonna community) Grade II* 319 m
  10. Lock keeper's and toll collector's office at SW end of Aberdulais Aqueduct Grade II 332 m