21 Mostyn Street is a Grade II listed building in the Conwy local planning authority area, Wales. First listed on 16 March 1976. Commercial building. 1 related planning application.
21 Mostyn Street
- WRENN ID
- solitary-postern-wind
- Grade
- II
- Local Planning Authority
- Conwy
- Constituency
- Bangor Aberconwy MP: Claire Hughes (Lab)
- Country
- Wales
- Date first listed
- 16 March 1976
- Type
- Commercial building
- Address
- 21 Mostyn Street, Llandudno, LL30 2NL
- OS grid reference
- SH 785 822
- Coordinates
- 53.32275, -3.82551
- Source
- Cadw listing
Description
Nos 21 and 23 Mostyn Street in Llandudno is a three-storey building with an attic and five bays, featuring a central bay with narrower windows. The exterior is clad in stucco and is topped with a balustraded parapet adorned with urn finials and a cornice. There is a verandah dating from the late 19th to early 20th century, which consists of six bays and has a modern corrugated roof. The verandah is supported by plain circular columns with panelled bases and bead moulding, while the capitals feature ornate iron spandrils with a flower motif and a band with a Greek key course extending between each pair of spandrils.
The building has a pyramidal slate roof with a gabled dormer and a two-window front. On the top floor, there are two casement windows, and on the first floor, there are two canted bay windows.
Local climate
21 Mostyn Street sits in a wetter-than-average part of the UK, with an average of 1,100 mm of rain a year. This makes it wetter than 87% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 76% of listed buildings.
It experiences an average of 34 freeze-thaw cycles a year, fewer than 51% of listed buildings. Of these, 18 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.
- No sale records on file
- 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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