Block 18 (H Block) is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 16 December 1976. House - terrace.

Block 18 (H Block)

WRENN ID
ancient-thatch-hawthorn
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
16 December 1976
Type
House - terrace
Address
Block 18 (H Block), Powys
OS grid reference
SO 051 281
Coordinates
51.94417, -3.38203
Source
Cadw listing

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

Description

Block 18, also known as H Block, is a former hospital building constructed in the 1840s, designed in a style consistent with other buildings from that period. It stands two storeys high with a basement and features a nine-window front, each window being a 12-pane sash. The entrance floor is elevated above the Parade Ground and is accessed through a small garden that includes stone retaining walls and iron railings with stone piers. In front of the central entrance, there is a double stone staircase with iron railings. The first floor is made of ashlar stone, while the ground floor and basement are rusticated. The central doorway, also made of ashlar, has a bracketed cornice and a rectangular overlight above it.

Local climate

Block 18 (H Block) sits in one of the wettest parts of the UK, with an average of 1,260 mm of rain a year. This makes it wetter than 93% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 82% of listed buildings.

It experiences an average of 56 freeze-thaw cycles a year, more than 96% of listed buildings. Of these, 32 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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