Thoby Priory Ruins is a Grade II listed building in the Brentwood local planning authority area, England. First listed on 29 December 1952. Ruins.

Thoby Priory Ruins

WRENN ID
old-jamb-ivory
Grade
II
Local Planning Authority
Brentwood
Constituency
Brentwood and Ongar MP: Alex Burghart (Con)
Country
England
Date first listed
29 December 1952
Type
Ruins
Address
Thoby Priory Ruins, Thoby Lane, Mountnessing
OS grid reference
TQ 626 987
Coordinates
51.6638, 0.35077
Source
Historic England listing

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

Description

Thoby Priory Ruins are the remnants of an Augustinian priory, dating from the 14th and 15th centuries. The structure is built from flint rubble and red brick in English bond. A section of the south wall of the presbytery, approximately 15 meters long, runs east-west and turns north for one meter at the eastern end, featuring a diagonal buttress at the corner. To the east, it adjoins an early 19th-century brick wall that is not of special architectural or historic interest. The ruins include two windows with two-centred arches, both splayed to the north, although the tracery is missing. The western window is largely obscured by creeper as of June 1989, while the eastern window, dating from the 15th century, is made of red bricks measuring 0.23 meters long, 0.10 meters wide, and 0.06 meters deep, shaped and blocked with red bricks in English bond up to a height of 2 meters. The rubble of the priory contains Roman brick and tile, with bonding courses of red brick similar to that of the eastern window. Some dressings of clunch are present, though much eroded, along with limestone. The priory was founded in the first half of the 12th century and was suppressed in 1525.

Local climate

Thoby Priory Ruins sits in one of the driest parts of the UK, with an average of 680 mm of rain a year. This makes it drier than 99% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 90% of listed buildings.

It experiences an average of 29 freeze-thaw cycles a year, fewer than 67% of listed buildings. Of these, 14 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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