Henallt House is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 1 February 1988. House. 3 related planning applications.

Henallt House

WRENN ID
under-fireplace-dust
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
1 February 1988
Type
House
Address
Henallt House, Hay-On-Wye, Hay, Powys, HR3 5AJ
OS grid reference
SO 230 422
Coordinates
52.0733, -3.12461
Source
Cadw listing

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

Description

Henallt House is a symmetrical, two-storey and attic, three-window building dating from the 18th century. It is constructed of coursed rubble with a steep slate roof, wide eaves supported by modillion brackets, and rubble chimney stacks at each end. The roof also features slate-hung dormers with casement windows. The front elevation has small-pane sash windows, each with a voussoir and keystone, with the central windows being narrower and positioned above an ogee hooded porch with glazed sides. The front door is a four-panelled, part-glazed design, with panelled reveals. The rear elevation is also of rubble, with mainly sash windows and a later, broader dormer. This building has group value from contributions to the character of the surrounding area.

Local climate

Henallt House receives an average of 900 mm of rain a year. This makes it wetter than 67% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 54% of listed buildings.

It experiences an average of 52 freeze-thaw cycles a year, more than 93% of listed buildings. Of these, 29 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 — 4 transactions since 2013
  • Related listed building consents — 3 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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