Porth-Mawr Gatehouse is a Grade I listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 4 January 1952. A Early C19 Gatehouse.
Porth-Mawr Gatehouse
- WRENN ID
- far-sentry-pine
- Grade
- I
- Local Planning Authority
- Brecon Beacons National Park
- Constituency
- Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
- Country
- Wales
- Date first listed
- 4 January 1952
- Type
- Gatehouse
- Address
- Porth-Mawr Gatehouse, Crickhowell, Powys
- OS grid reference
- SO 217 185
- Coordinates
- 51.86042, -3.13765
- Source
- Cadw listing
Description
Porth-Mawr Gatehouse is a two-storey crenellated gateway that is set forward from the adjoining walls, featuring early 19th-century picturesque alterations. The structure is built of rubble masonry with dressed quoins and is covered in extensive creeper.
The gatehouse has a battlemented parapet, a small turret at the northeast angle, and an octagonal stone chimney stack. On the first floor, there is a four-light window beneath a hood mould, with a small stair light to the right. The ground floor features a pointed arched entrance with weathered mouldings, a hood, and stops; it has later pointed doors adorned with strapwork panelling and openwork tops.
Inside, the gatehouse has a two-bay layout with a 19th-century sexpartite ribbed vault that includes decorative bosses. There are low rubble seats on either side and a six-panel door to the right. A chamfered inner arch leads to the house, which has a two-light window with a square head and hood mould.
Local climate
Porth-Mawr Gatehouse sits in a wetter-than-average part of the UK, with an average of 1,020 mm of rain a year. This makes it wetter than 81% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 71% of listed buildings.
It experiences an average of 50 freeze-thaw cycles a year, more than 92% of listed buildings. Of these, 27 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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