Grisiau Mawr (steps between Pencei (Cornhill) and Ffordd Garth) is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 30 March 1951. Steps. 2 related planning applications.
Grisiau Mawr (steps between Pencei (Cornhill) and Ffordd Garth)
- WRENN ID
- over-tin-grain
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 30 March 1951
- Type
- Steps
- Address
- Grisiau Mawr (steps between Pencei (Cornhill) and Ffordd Garth), Porthmadog, LL49 9BH
- OS grid reference
- SH 568 383
- Coordinates
- 52.92339, -4.13094
- Source
- Cadw listing
Description
Grisiau Mawr consists of three steep flights of steps connecting Pencei (Cornhill) to Ffordd Garth. The steps are built between garden walls and the end walls of adjacent buildings. Originally constructed with slate treads, these have been renewed in concrete. An iron handrail is present only at the base of the steps.
Local climate
Grisiau Mawr (steps between Pencei (Cornhill) and Ffordd Garth) sits in one of the wettest parts of the UK, with an average of 1,490 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 97% of listed buildings.
It experiences an average of 32 freeze-thaw cycles a year, fewer than 60% of listed buildings. Of these, 15 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 2005
- Related listed building consents — 2 applications
- 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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