Remains of St Constantine's Well is a Grade II listed building in the Cornwall local planning authority area, England. First listed on 6 June 1969. A Medieval Well house.

Remains of St Constantine's Well

WRENN ID
fading-iron-jay
Grade
II
Local Planning Authority
Cornwall
Constituency
North Cornwall MP: Ben Maguire (LD)
Country
England
Date first listed
6 June 1969
Type
Well house
Period
Medieval
Address
Remains of St Constantine's Well, St. Merryn
OS grid reference
SW 865 749
Coordinates
50.53534, -5.01397
Source
Historic England listing

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

Description

The remains of St Constantine's Well is a well house dedicated to St Constantine, dating from the medieval period, possibly the 14th century. It is constructed of stone rubble and has a rectangular plan with a small well sump located at the rear. The well house is low and features the remnants of a pointed stone vaulted roof. Inside, there is a pointed arched opening towards the rear, positioned over the well sump, with a niche above it. Nearby, several pieces of medieval tracery can be found. The well house was rediscovered in 1917 after being buried under seven feet of sand. In the mid-20th century, a shelter was erected over the well house.

Local climate

Remains of St Constantine's Well sits in a wetter-than-average part of the UK, with an average of 1,000 mm of rain a year. This makes it wetter than 80% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 92% of listed buildings.

It experiences an average of 6 freeze-thaw cycles a year, fewer than 96% of listed buildings. Of these, 2 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.

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