Harbourside Clinic and apartments is a Grade II listed building in the Gwynedd local planning authority area, Wales. First listed on 30 March 1951. Clinic, apartments.

Harbourside Clinic and apartments

WRENN ID
peeling-rafter-moon
Grade
II
Local Planning Authority
Gwynedd
Constituency
Dwyfor Meirionnydd MP: Liz Saville Roberts (PC)
Country
Wales
Date first listed
30 March 1951
Type
Clinic, apartments
Address
Harbourside Clinic and apartments, 4-5 Pencei (Cornhill), Porthmadog
OS grid reference
SH 568 383
Coordinates
52.9232, -4.13062
Source
Cadw listing

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

Description

This is a 4-storey, 4-bay block built of large blocks of slate-stone, laid in regular courses, and covered by a slate roof with a ridge stack to the left of centre and to the left-hand ridge. The building forms part of a group located at 2-5 Cornhill, which was formerly known as 2-5 Pencei.

The front facade features unequal, gabled bays at numbers 2 and 5. The left-hand bay (number 2) has replacement windows, with larger windows on the lower storey, and a recessed entrance to the right, featuring a half-glazed door with side panel that replaced a larger original door. Number 3 has a replacement half-glazed door and overlight on the right-hand side, alongside a 2-pane sash window to its left. The second storey of number 3 has a replacement window, while the third and fourth storeys retain earlier 2-pane sash windows. Number 4 features a panel door with overlight, a 16-pane hornless sash window to its left, and similar windows on the second and third storeys; the fourth storey has a shorter 12-pane sash window. Number 5, situated under the right-hand gable, has a half-glazed panel door with a 2-light small-pane window to its left. The second, third and fourth storeys of number 5 all have 18-pane sash windows where loading doors once stood, with a pulley block above the upper-storey window.

The right-hand end wall (number 5) still shows the outline of a former 1-storey gabled building, and has replacement 2-light windows in the second, third and fourth storeys. The left-hand end (number 2), with two windows, also features replacement windows and a lean-to projecting forward with a blocked window facing the front. A garage with double doors, set under a steel lintel, is located at the left-hand end of the building.

Local climate

Harbourside Clinic and apartments 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 — 4 transactions since 1997
  • 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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Nearby listed buildings

  1. 3 Pencei (Cornhill) Grade II 6 m
  2. 2 Pencei (Cornhill) Grade II 12 m
  3. Ty Toronto Grade II 19 m
  4. Cornhill Wharf Grade II 25 m
  5. Grisiau Mawr (steps between Pencei (Cornhill) and Ffordd Garth) Grade II 30 m
  6. Madoc Yacht Club Grade II 32 m
  7. 7 Pencei (Cornhill) Grade II 33 m
  8. 8 Pencei (Cornhill) Grade II 38 m
  9. 9 Pencei (Cornhill) Grade II 44 m
  10. Harbour Side, including attached gate piers and wall Grade II 46 m