Megalithic folly at James Howell House is a Grade II listed building in the Cardiff local planning authority area, Wales. First listed on 24 May 2002. Folly. 1 related planning application.
Megalithic folly at James Howell House
- WRENN ID
- sharp-cupola-blackthorn
- Grade
- II
- Local Planning Authority
- Cardiff
- Constituency
- Cardiff East MP: Jo Stevens (Lab)
- Country
- Wales
- Date first listed
- 24 May 2002
- Type
- Folly
- Address
- Megalithic folly at James Howell House, Tredegarville, Roath, CF24 3AF
- OS grid reference
- ST 188 769
- Coordinates
- 51.4853, -3.17003
- Source
- Cadw listing
Description
This is a megalithic folly at James Howell House, constructed from Radyr stone. It comprises three upright slabs that enclose three sides of a chamber, with a single capstone covering the top.
Local climate
Megalithic folly at James Howell House 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 87% of listed buildings.
It experiences an average of 22 freeze-thaw cycles a year, fewer than 77% of listed buildings. Of these, 8 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 — 2 transactions since 1997
- Related listed building consents — 1 application
- 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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