The Close Wall (formerly listed with Porth Y Twr) is a Grade II* listed building in the Pembrokeshire Coast National Park local planning authority area, Wales. First listed on 1 March 1963. A Medieval Medieval wall.

The Close Wall (formerly listed with Porth Y Twr)

WRENN ID
ghost-dormer-swift
Grade
II*
Local Planning Authority
Pembrokeshire Coast National Park
Constituency
Mid and South Pembrokeshire MP: Henry Tufnell (Lab)
Country
Wales
Date first listed
1 March 1963
Type
Medieval wall
Period
Medieval
Address
The Close Wall (formerly listed with Porth Y Twr), St. David's and the Cathedral Close
OS grid reference
SM 751 253
Coordinates
51.88094, -5.26903
Source
Cadw listing

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

Description

The Close Wall, formerly listed with Porth Y Twr, is a medieval surrounding wall for The Cathedral Close. It was noted as ruinous and in need of repair in 1379 and extends for about 1000 meters around the Close. Only a small section remains at full height, with the most impressive part being the stretch that runs from the lane west of the Deanery to Pont Cerwen Dewi. A substantial section also runs north from Porth y Twr. On the north side, the wall crosses the river Alun via a rough segmental masonry arch.

There were originally four gates into The Close, with Porth y Twr being the only one that still exists. The sites of the other gates include Porth Padrig, located by the lane west of the Deanery, Porth Gwyn, which was northwest of The Archdeaconry, and Porth Boning, adjacent to The Canonry. It is believed that a wall surrounding the cathedral enclosures existed as early as 1172.

Local climate

The Close Wall (formerly listed with Porth Y Twr) sits in a wetter-than-average part of the UK, with an average of 1,050 mm of rain a year. This makes it wetter than 85% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 96% of listed buildings.

It experiences an average of 3 freeze-thaw cycles a year, fewer than 99% of listed buildings. Of these, 1 follows 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.

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Nearby listed buildings

  1. Warehouse occupied by St David's Assemblies Grade II 22 m
  2. Coach House to the Deanery Grade II 23 m
  3. Churchyard Boundary Wall on N.side of the Pebbles Grade II 36 m
  4. Wall along S.Side of the Pebbles Grade II 41 m
  5. 37 Goat Street Grade II 48 m
  6. The Deanery including Garden Walls & Gate Grade II 51 m
  7. 35 Goat Street Grade II 56 m
  8. Warehouse between Merrivale & No.2 Catherine Street Grade II 60 m
  9. 33 Goat Street Grade II 61 m
  10. Churchyard with Memorials surrounding St. David's Cathedral (Memorials previously listed separately) Grade II 68 m