Tyn Llwyn is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 4 August 1998. Cottage.

Tyn Llwyn

WRENN ID
stranded-wattle-acorn
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
4 August 1998
Type
Cottage
Address
Tyn Llwyn, Rhosgadfan, Caernarfon, Llanwnda
OS grid reference
SH 510 576
Coordinates
53.09526, -4.22634
Source
Cadw listing

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

Description

Tyn Llwyn is a cottage with an attached cowhouse, dating from the 18th century. The cottage is a single-storey, two-room structure with a small catslide outshut at the rear on the left side. It is aligned roughly from north-east to south-west, with an additional room under the same roof line to the south-west, which also features a catslide outshut at the rear. A lean-to cowhouse is attached to the gable end of this room, with its north-east wall rising above the slope of the main roof and the catslide roof to the rear, providing extra height. There is a similar lean-to on the north-east gable end of the cottage, set back, with its south-west wall also rising above the main roof slope. This lean-to has been extended to the front with 20th-century additions.

The building is constructed of roughly coursed rubblestone, primarily limewashed, although the left gable end is rendered and the right side of the ridge stack is without surface finish. The roof is covered with grouted slate. The main cottage features a four-paned sash window on either side of an offset boarded door, which is sheltered by a shallow gabled porch with a basket arch. There is a substantial integral end stack on the left and a ridge stack on the right at the junction with the third room, which has a boarded door to the right of the stack and a six-paned window adjacent to it, along with a small rooflight directly above the door. The cowhouse has a boarded door at the front, and the left lean-to includes a narrow painted brick chimney at the north-east corner, with small windows in the rear outshuts.

Inside, the room to the left of the entrance has a blocked fireplace and is ceiled at purlin level. The room to the right has a low ceiling and a loft, which may have been a croglofft, accessed from a very small room at the rear.

Local climate

Tyn Llwyn sits in one of the wettest parts of the UK, with an average of 1,380 mm of rain a year. This makes it wetter than 97% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 98% of listed buildings.

It experiences an average of 25 freeze-thaw cycles a year, fewer than 73% of listed buildings. Of these, 12 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
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  • 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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