H M Prison Dartmoor: wall enclosing the former marketplace is a Grade II listed building in the Dartmoor National Park local planning authority area, England. First listed on 12 February 2016. Wall.

H M Prison Dartmoor: wall enclosing the former marketplace

WRENN ID
night-obsidian-owl
Grade
II
Local Planning Authority
Dartmoor National Park
Constituency
Torridge and Tavistock MP: Sir Geoffrey Cox (Con)
Country
England
Date first listed
12 February 2016
Type
Wall
Address
H M Prison Dartmoor: wall enclosing the former marketplace, Princetown, Yelverton, Dartmoor Forest, West Devon, PL20 6RR
OS grid reference
SX 586 740
Coordinates
50.54933, -3.99664
Source
Historic England listing

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

Description

The wall enclosing the south side of the former marketplace at the center of Dartmoor Prison was completed in 1809. It was shortened in the early to mid-20th century and has undergone later repairs.

Constructed from granite stone rubble, the wall features rounded granite stone copings. It is approximately 20 meters long and about 2 meters high, gently sweeping down at its east end. At the west end, the wall is finished with a square gate pier that is topped with a square coping stone, which has rusticated sides.

Local climate

H M Prison Dartmoor: wall enclosing the former marketplace receives an average of 940 mm of rain a year. This makes it wetter than 72% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 80% of listed buildings.

It experiences an average of 22 freeze-thaw cycles a year, fewer than 77% of listed buildings. Of these, 10 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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  • 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. H M Prison Dartmoor: Polygonal buildings, former officers' mess and former steward's house, now admin building and visits building Grade II 42 m
  2. H M Prison Dartmoor: Inner Gateway, Former Guard's Rooms, Carriage Way and Perimeter Wall Grade II 51 m
  3. H M Prison Dartmoor: former Petty Officer's Block, now Chapel, Primary Care Unit and Segregation Unit Grade II 56 m
  4. H M Prison Dartmoor: Former Infirmary Grade II 57 m
  5. H M Prison Dartmoor: A and B Wings Grade II 78 m
  6. H M Prison Dartmoor: The Old Kitchen Grade II 90 m
  7. H M Prison Dartmoor: Outer Gateway with Walls, Flanking Houses and northern outbuilding Grade II 92 m
  8. H M Prison Dartmoor: Former Chapel and Service Building Complex Grade II 93 m
  9. H M Prison Dartmoor: F and G Wings Grade II 105 m
  10. H M Prison Dartmoor: C and D Wings Grade II 115 m