Ty Mawr Farmhouse is a Grade II listed building in the Powys local planning authority area, Wales. First listed on 17 January 1963. Farmhouse.

Ty Mawr Farmhouse

WRENN ID
old-loft-summer
Grade
II
Local Planning Authority
Powys
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
17 January 1963
Type
Farmhouse
Address
Ty Mawr Farmhouse, Llan-Y-Wern, Llangors
OS grid reference
SO 100 286
Coordinates
51.94919, -3.30979
Source
Cadw listing

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

Description

Ty Mawr Farmhouse is a large farmhouse consisting of two units, with the smaller unit featuring a steeper roof pitch that faces the lane. The building is constructed of limewashed stone rubble and has a Welsh slate roof, along with end and ridge stacks. It has two storeys and an attic. The garden-facing side has two windows in the larger unit on the left and one in the smaller unit on the right; three of these windows are 4/4 pane sashes, with two having segmentally arched tops. The gable end facing the road is battered and includes a blocked square-headed window that was formerly mullioned, located at the staircase, with a small chamfered attic light above it and a nine-pane bedroom window.

On the rear elevation, there is a lean-to porch on the left featuring a round arched doorway, with three stone steps leading up to the interior, which has stone benches, a boarded door, a small pantry window to the right, and a blocked narrow light to the left; a mounting block is also present on the left. To the right, there is a two-storey lean-to rear wing with a catslide roof and a wide, low kitchen stack that shows weathercoursing; there are external steps at the rear leading to the first floor, with some small pane fixed glazing and other windows having been replaced.

The farmyard located on the other side of the lane is large and includes a range of farm buildings, some of which are derelict. The interior has not been seen but is described by the owner as retaining a two-storey stone and oak staircase by the chimney, with timber beams boxed in and remodelled fireplaces.

Local climate

Ty Mawr Farmhouse 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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  • 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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  1. Barn at Ty Mawr Grade II 45 m
  2. Barn range at Ty Canol Grade II 56 m
  3. Granary range at Ty Canol Grade II 57 m
  4. Cart shed range at Ty Mawr Grade II 68 m
  5. Ty Canol farmhouse Grade II 85 m
  6. Church of St Mary Grade II* 111 m
  7. Tal-y-llyn Railway Tunnel Grade II 1.4 km
  8. Group of 2 chest tombs in the churchyard to SW of church of St Michael and All Angels Grade II 1.4 km
  9. Church of St Michael and All Angels Grade II 1.4 km
  10. Group of two table tombs in the churchyard to S of church of St Michael and All Angels Grade II 1.4 km