Bryn Helyg is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 31 March 1983. Terraced houses. 1 related planning application.

Bryn Helyg

WRENN ID
ragged-hall-myrtle
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
31 March 1983
Type
Terraced houses
Address
Bryn Helyg, 24 Segontium Terrace, Caernarfon, LL55 2PH
OS grid reference
SH 480 625
Coordinates
53.1381, -4.27274
Source
Cadw listing

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

Description

Bryn Helyg is a late Georgian terrace of seven three-storey, two-bay houses with basements, situated at 20-26 Segontium Terrace. The frontages are rendered, while some houses retain original moulded architraves around the windows. The rear walls are constructed of exposed rubble stone. The roofs are slate and slope to the rear, with each house featuring a brick or roughcast chimney stack on the right-hand side. The doorways are located on the left-hand sides and are accessed by steps. Many of the houses still have original iron railings atop a low stone wall, although the basement step gates have been replaced. The railings are topped with trident finials and urn finials on the stanchions. One house has a roughcast front with replaced windows in original openings, a blind upper left-hand side, and an added open-gabled porch, complete with a replaced front door and overlight. The forecourt railings have been removed from this property. The houses belong to a group at 20-26 Segontium Terrace.

Local climate

Bryn Helyg 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

Sign in or create a free account to unlock:

  • Full EPC report — heating system, energy costs, size, glazing, construction etc.
  • Sale history — 1 transaction since 2013
  • 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
Create free account

Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.

Similar buildings

The closest matches to this building from all 493,000 UK listed buildings, by architecture, period and materials.

Nearby listed buildings

  1. 25 Segontium Terrace, including forecourt railings Grade II 4 m
  2. 23 Segontium Terrace Grade II 5 m
  3. 22 Segontium Terrace, including forecourt railings Grade II 11 m
  4. 26 Segontium Terrace, including forecourt railings Grade II 11 m
  5. 21 Segontium Terrace Grade II 15 m
  6. 27 Segontium Terrace, including forecourt railings Grade II 17 m
  7. 20 Segontium Terrace, including forecourt railings Grade II 19 m
  8. 46 Chapel Street Grade II 24 m
  9. 28 Segontium Terrace, including forecourt railings Grade II 24 m
  10. 41 New Street including forecourt railings Grade II 25 m