Bryn-mawr is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 21 July 2000. House.

Bryn-mawr

WRENN ID
tired-plinth-solstice
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
21 July 2000
Type
House
Address
Bryn-mawr, Penygroes, Caernarfon, Llanllyfni
OS grid reference
SH 452 535
Coordinates
53.05636, -4.31022
Source
Cadw listing

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

Description

Bryn-mawr is a single-storey building with a three-room layout, oriented roughly from north-east to south-west. The left room, located to the south-west, is an addition to the original structure. At the rear, there is a continuous catslide outshut that extends almost the full length of the building, connecting the original cottage to the addition. The front features irregularly coursed rubblestone with traces of limewash on the original part, while the outshut has more regularly coursed rubblestone. The roof is covered with graded slate.

The front of the building has four-paned sash windows on either side of an offset boarded door leading to the original cottage. There is also another four-paned sash window with a slate cill in the addition. The building has integral end stacks with slate drips, the most prominent being on the larger left room of the original cottage, and there are no openings in the outshut.

The original cottage consists of a two-room plan with a stone cross wall that includes two doorways leading to the smaller room on the right. The left ground-floor room, which is the addition, features a spindly A-frame truss at the center with lime torching on the underside of the roof. It also has a large integral end fireplace with a slate lintel and mantleshelf, along with a window seat on the front wall.

Local climate

Bryn-mawr sits in one of the wettest parts of the UK, with an average of 1,370 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 20 freeze-thaw cycles a year, fewer than 78% of listed buildings. Of these, 9 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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