Tyn-llan is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 30 March 1999. House.

Tyn-llan

WRENN ID
gentle-railing-tarn
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
30 March 1999
Type
House
Address
Tyn-llan, Penmorfa, Dolbenmaen, LL49 9SG
OS grid reference
SH 541 403
Coordinates
52.94039, -4.17171
Source
Cadw listing

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

Description

Tyn-llan is a two-storey house built of pebbledashed rubble stone, topped with a slate roof. The building features three bays and is one room deep. The main two bays contain reception rooms on either side of an entrance hall, each with axial stacks. The third bay, located at the southwest end, serves as a service area and includes a gable stack. The main front door is boarded and has a simple rectangular overlight above it, along with narrow four-pane horned sash windows. The upper bay also has a boarded door and similar windows. All upper windows are adorned with small gables that break through the eaves line. Additionally, there is a rear wing that is one storey with an attic and features a gable stack.

Local climate

Tyn-llan sits in one of the wettest parts of the UK, with an average of 1,550 mm of rain a year. This makes it wetter than 99% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 99% of listed buildings.

It experiences an average of 20 freeze-thaw cycles a year, fewer than 79% of listed buildings. Of these, 8 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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