Cae Glas is a Grade II listed building in the Snowdonia National Park local planning authority area, Wales. First listed on 14 May 1998. House.

Cae Glas

WRENN ID
far-tracery-auburn
Grade
II
Local Planning Authority
Snowdonia National Park
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
14 May 1998
Type
House
Address
Cae Glas, Croesor, Porthmadog, Llanfrothen, Gwynedd
OS grid reference
SH 627 447
Coordinates
52.98208, -4.04579
Source
Cadw listing

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

Description

Cae Glas is a two-storey end chimney house constructed from whitened rubble on boulder foundations, featuring an L-shaped plan that includes a rear addition. The building has a modern slate roof and projecting gabled chimneys, with the southwest gable chimney corbelled out at the first-floor level and squat stacks. The near-centre entrance has a modern boarded door, which is a late 19th-century opening. The original entrance to the left was reduced at the same time to create a recessed 6-pane sash window, with the rough slate-stone voussoirs of the primary entrance still visible above. To the right of the current entrance is another sash window. The first floor has two small, square 6-pane sashes. An external slate-stepped stair on the left provides access to a 19th-century upper entrance, which now has a modern glazed door.

At the rear, there is a lower service wing built in the same style, with a squat end chimney and a recessed entrance on the southwest side featuring a modern part-glazed door. The primary block's rear has small original window openings on both sides of the extension, while modern windows are present on the southwest gable on both floors. Adjoining to the left (northeast) is a 2-bay addition made of whitened rubble with a slated roof, which includes a plain cart entrance in the centre and a corrugated iron lean-to beyond.

The former cross-passage is indicated by opposing original entrances and evidence of mortising for former post-and-panel screens, with a section stored in the adjoining byre. Inside, there is a flat, stopped-chamfered bressummer above a wide fireplace in the former hall (to the right), and chamfered main beams are visible in the ground-floor rooms, with joists plastered over. The floors are slate-flagged. A late 19th-century pine stick baluster stair with a turned newel leads to the first floor, where the hall/solar is partly open to the four-bay roof. The roof structure includes three bays with fine collar-and-raking strut trusses, two tiers of cusped windbraces, and original purlins and rafters, along with original projecting oak trenails. Beyond the solar, a former partition truss (now open) divided bays three and four, with the latter serving as a sleeping chamber.

Local climate

Cae Glas sits in one of the wettest parts of the UK, with an average of 1,440 mm of rain a year. This makes it wetter than 98% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 96% of listed buildings.

It experiences an average of 40 freeze-thaw cycles a year, more than 78% of listed buildings. Of these, 22 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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Nearby listed buildings

  1. Barn 25m SE of Cae Glas Grade II 27 m
  2. Barn 100m NE of Cae Glas Grade II 68 m
  3. Boulder-built Boundary Walls above the Upper Drive at Parc Grade II 615 m
  4. Bridge at Parc Grade II 681 m
  5. Barn at Parc Grade II 726 m
  6. Walls and Revettments to Upper Terrace Garden at Parc Grade II 732 m
  7. Parc Grade II* 751 m
  8. L-shaped Agricultural Range at Parc Grade II* 757 m
  9. Ceunant-y-Parc Grade II 1.1 km
  10. Beudy Newydd Grade II 1.2 km