20 Market Street is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 31 March 1983. House.
20 Market Street
- WRENN ID
- lesser-flagstone-swift
- Grade
- II
- Local Planning Authority
- Gwynedd
- Constituency
- Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
- Country
- Wales
- Date first listed
- 31 March 1983
- Type
- House
- Address
- 20 Market Street, Walled Town, Caernarfon
- OS grid reference
- SH 478 629
- Coordinates
- 53.1415, -4.27657
- Source
- Cadw listing
Description
20 Market Street is part of a terrace of five tall and narrow three-storey, two-bay houses. The houses feature scribed roughcast fronts, except for No 18, which is pebble-dashed. They have graded slate roofs, although No 22 has had its roof replaced, and each house has a roughcast stack on the right side. The doorways are located on the right side of each house, with blind windows above them. Nos 16 and 20 have retained their panelled doors with three-pane overlights, while No 24 has a fielded-panel door. The other houses have replaced doors and overlights. No 16 still has its original 16-pane hornless sash windows, which are shorter on the upper storey. No 20 features similar horned sashes, and No 24 has 20-pane sashes on the lower two storeys and 16-pane sashes on the upper storey. Nos 18 and 22 have had their windows replaced.
The rear elevation is made of rubble stone, with single-storey projections, except for No 16, which has a two-storey projection. No 24 has a slightly deeper plan, causing it to project in front of the other houses. The original openings have slate lintels, but the windows have been replaced.
This terrace is part of the group of buildings at 16-24 Market Street.
Local climate
20 Market Street 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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- No EPC on record for this property
- No sale records on file
- No related consent applications matched
- 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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