Two granaries at Ty Mawr is a Grade II* listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 21 August 1998. Granary. 1 related planning application.

Two granaries at Ty Mawr

WRENN ID
under-sentry-larch
Grade
II*
Local Planning Authority
Brecon Beacons National Park
Constituency
Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
Country
Wales
Date first listed
21 August 1998
Type
Granary
Address
Two granaries at Ty Mawr, Llangasty Tal-Y-Llyn, Llangors, Powys, LD3 7PJ
OS grid reference
SO 124 260
Coordinates
51.92564, -3.27502
Source
Cadw listing

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

Description

The two granaries at Ty Mawr date from the 19th century and are located facing south. The building on the right is a freestanding rectangular structure, while the one on the left is attached to the southern bay of a barn range that connects at right angles to Ty Mawr house. Both buildings are constructed of narrow coursed stone rubble with dressed stone dressings and putlogs, topped with hipped stone tiled roofs.

The right granary features a symmetrical frontage with three segmental arched doorways, each with keystones, which have been later adapted for use as a doorway and window, with one doorway now blocked. On the first floor, there are three segmental arched windows with keystones, one of which is blocked. The rear elevation facing the farmhouse includes a square-headed doorway with a timber lintel and a boarded door, accessed by four steep stone steps, along with three blocked openings to the right and buttresses at the corners.

The left granary is very shallow, displaying three blocked round arches at ground floor level, complete with voussoirs and a continuous string at the impost level. There is a square-headed doorway in the right arch. On the first floor, there were originally three oculi; currently, one is blocked, one is damaged, and one has had its voussoirs removed. An end stack is located on the right side.

The larger granary on the right has a ground floor stable with a lime plastered interior, some manger fittings, and a cobbled floor. The granary above is supported by a timber framework with chamfered wooden posts and features two main roof trusses consisting of tie beams, collars, and struts. The smaller granary on the left has three trusses of collar and tie, with part of the first floor still intact.

Local climate

Two granaries at Ty Mawr 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
  • No sale records on file
  • 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
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  2. Ty Mawr farmhouse including attached range to W Grade II 29 m
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