Malthouse at Alltmawr Isaf is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 23 March 1962. Outbuilding.
Malthouse at Alltmawr Isaf
- WRENN ID
- empty-screen-elder
- Grade
- II
- Local Planning Authority
- Powys
- Constituency
- Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
- Country
- Wales
- Date first listed
- 23 March 1962
- Type
- Outbuilding
- Address
- Malthouse at Alltmawr Isaf, Builth Wells, Erwood
- OS grid reference
- SO 064 475
- Coordinates
- 52.11853, -3.36751
- Source
- Cadw listing
Description
The Malthouse at Alltmawr Isaf is a two-storey outbuilding constructed in rubble stone with corrugated iron roofs, designed in an L-shape. The front features a large projecting wing on the right, which has a gable end with a small roundel made of stone voussoirs above two blocked large windows on the first floor. The ground floor includes a full-width weatherboarded opening with a long chamfered timber lintel, and there is a quadrant moulded course of projecting stones above this lintel. The left jamb of the opening is rounded.
On the right side wall, there is a substantial external flight of stairs leading to a loft door, with a slate roof extending down over it, supported by a wooden post. The left side wall has one window on the first floor. The left side of the main range contains two upper windows located under the eaves, one of which is a cross-window. The ground floor features a single long chamfered lintel over a window to the left and a door to the right, with quadrant moulded stones above the lintel. The south gable is windowless and includes some late 19th century or early 20th century black brick in the quoins. The rear wall is bowing outward as of 2000. The upper gable has a similar apex roundel above the first and ground floor windows, both of which have timber lintels.
The interior is not available for inspection.
Local climate
Malthouse at Alltmawr Isaf sits in a wetter-than-average part of the UK, with an average of 1,080 mm of rain a year. This makes it wetter than 86% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 75% of listed buildings.
It experiences an average of 46 freeze-thaw cycles a year, more than 87% of listed buildings. Of these, 25 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
- No sale records on file
- 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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