Lower Revetment including Steps and Bull Cot at Tynyllwyn is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 19 November 1998. A C17 Revetment.

Lower Revetment including Steps and Bull Cot at Tynyllwyn

WRENN ID
twisted-basalt-grove
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
19 November 1998
Type
Revetment
Address
Lower Revetment including Steps and Bull Cot at Tynyllwyn, Partrishow, the Vale of Grwyney, Powys
OS grid reference
SO 280 223
Coordinates
51.89508, -3.04656
Source
Cadw listing

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

Description

Lower Revetment including Steps and Bull Cot at Tynyllwyn is a structure dating from the mid-17th century. It features a battered rubble-stone revetment that curves around below the house. At the left end, there are stone steps, while to the right is a large rectangular recessed bay that contains the bull cot. The bull cot is a lean-to with a stone tile roof, supported by two timber posts on either side of the center. Between these posts, there is stone infill below boarded openings. On the right and left sides of the bull cot, there are full-height boarded doors, with the left door being damaged. The stone walls at the ends are rebuilt from the 19th century on the right side and feature hammer-dressed quoins.

Local climate

Lower Revetment including Steps and Bull Cot at Tynyllwyn receives an average of 940 mm of rain a year. This makes it wetter than 72% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 65% of listed buildings.

It experiences an average of 49 freeze-thaw cycles a year, more than 90% 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.

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