Lock House is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 28 July 2005. House. 2 related planning applications.

Lock House

WRENN ID
veiled-flagstone-cream
Grade
II
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
28 July 2005
Type
House
Address
Lock House, Cefn Brynich, Llanfrynach, Powys, LD3 7UY
OS grid reference
SO 077 273
Coordinates
51.93702, -3.34388
Source
Cadw listing

Also on this page: sale history · related consents · flood risk · radon risk · weather exposure · detailed attributes ↓

Description

Lock House is a house constructed of painted rubble stone, featuring a slate roof and 20th-century brown brick stacks at the original end walls, with a larger stack at the northern end. The southern end has a 20th-century addition that matches the original roof line. The house is one and a half storeys tall and has a double fronted design with small-paned casement windows. There are two pairs of casement windows that break the eaves under catslide roofs, alongside a triple casement window on the left and a casement pair on the right of a broad doorway that has a 20th-century half-glazed door. The ground floor openings have cambered heads with stone voussoirs and stone sills. There is a lean-to on the right end wall and a loft window above it. A 20th-century rendered one-bay addition is located on the left end, which includes a 20th-century casement pair on the ground floor front. Additionally, there is a window on each floor facing the southern end towards the canal. The property is not available for inspection.

Local climate

Lock House sits in one of the wettest parts of the UK, with an average of 1,180 mm of rain a year. This makes it wetter than 90% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 78% of listed buildings.

It experiences an average of 57 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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  • No EPC on record for this property
  • Sale history — 1 transaction since 2016
  • Related listed building consents — 2 applications
  • 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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Nearby listed buildings

  1. Canal Bridge No 163 and Cefn Brynich Lock Chamber Grade II 20 m
  2. Lock Cottage Grade II 38 m
  3. Lock Road Bridge Grade II* 79 m
  4. Barn range at Cefn Brynich Grade II 120 m
  5. Cefn Brynich Canal Bridge Aqueduct Grade II* 211 m
  6. Canal Bridge No 162 Brecon & Abergavenny Canal Grade II 308 m
  7. Canal Bridge No 161 Brecon & Abergavenny Canal Grade II 685 m
  8. Cartshed at Abercynrig Grade II 766 m
  9. Stable at Abercynrig Grade II 774 m
  10. Tunnel carrying Brynich stream under Brecon & Abergavenny Canal (partly in Brecon community) Grade II 775 m