Summerhouse at Glan-y-Mawddach is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 31 January 1995. Summerhouse. 1 related planning application.

Summerhouse at Glan-y-Mawddach

WRENN ID
forgotten-copper-crag
Grade
II
Local Planning Authority
Snowdonia National Park
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
31 January 1995
Type
Summerhouse
Address
Summerhouse at Glan-y-Mawddach, Cutiau, Barmouth, Gwynedd, LL42 1TF
OS grid reference
SH 630 167
Coordinates
52.7312, -4.02951
Source
Cadw listing

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

Description

The summerhouse at Glan-y-Mawddach is a timber structure, built in an eclectic Gothic style with Arts and Crafts detailing. It appears to be part-open and dates to an unknown period. The roof is gabled, covered with felt and featuring wavy decorative bargeboards and a central finial, though the finial itself is missing. The eaves overhang and feature exposed, chamfered rafter ends. Inside, the roof is boarded and supported by three thin longitudinal tie beams. The summerhouse has two bays; the front is open and rests on stopped-chamfered posts set on stone blocks. Each face of each post is decorated with carved panels depicting foliage and heraldic motifs. Arched braces support the open sides, further embellished with carved foliate decoration and oak-leaf corbels, along with cusped spandrels. The rear bay is enclosed on three sides and boasts elaborate interior carvings featuring foliage, reeds, birds, and insects, all in relief. Heraldic stained glass windows are set into the return walls, while the upper gable features a tripartite geometric coloured glass panel. The rear wall has two boarded sections, likely originally intended for seating. Inscribed on the right post of the rear bay is the inscription “A Lloyd Fecit.”

Local climate

Summerhouse at Glan-y-Mawddach sits in one of the wettest parts of the UK, with an average of 1,390 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 95% of listed buildings.

It experiences an average of 28 freeze-thaw cycles a year, fewer than 69% of listed buildings. Of these, 13 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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  • Full EPC report — heating system, energy costs, size, glazing, construction etc.
  • Sale history — 2 transactions since 2016
  • 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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