Porch House is a Grade II* listed building in the South Gloucestershire local planning authority area, England. First listed on 30 March 1960. House. 2 related planning applications.

Porch House

WRENN ID
peeling-truss-thrush
Grade
II*
Local Planning Authority
South Gloucestershire
Constituency
Thornbury and Yate MP: Claire Young (LD)
Country
England
Date first listed
30 March 1960
Type
House
Address
Porch House, 11, Castle Street, Thornbury, BS35 1HA
OS grid reference
ST 636 902
Coordinates
51.61009, -2.52692
Source
Historic England listing

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

Description

Porch House, located on Thornbury Castle Street, has origins dating back to the 15th century, with alterations and extensions made in the late 16th and 17th centuries, and further modifications in the 18th century. The building is rendered and features a coursed rubble porch, with an irregular roof made of pantiles and double Roman tiles. It has large rendered stacks, one of which is lateral, and is designed in a U-plan configuration.

The main building, which is two storeys high, has three glazing bar sash windows and a three-light casement window to the right of the porch. The ground floor features four-light windows with ovolo moulded mullions. The projecting gabled porch includes a two-centred arch freestone doorway with hollow and ogee moulding. To the left of the porch is a six-panel door with an overlight, topped by a triangular hood supported by carved brackets.

On the south elevation, there are four glazing bar sash windows, along with a modern projecting porch. Inside, the structure has a two-bay open area that was formerly supported by three tiers of windbraces. The lower end consists of three bays, which include a cross entry and kitchen, featuring one tier of windbraces. There are four raised cruck trusses with tenoned cambered collars, and a possible smoke bay in the kitchen. The parlour is located to the south in a late 16th-century wing, while a possible service wing to the north has been modernised.

The hall features a partially blocked moulded archway directly opposite the porch, along with blocked windows, one of which dates back to the mid-17th century and has open scroll catches. The kitchen fireplace is situated at the north end. In the south wing, the east room (parlour) is panelled with small square panels and has an ogee moulded cornice, along with a panelled door in the north-west corner. The beams in this area are chamfered with run-out stops, while other rooms in the south wing have stop-chamfered beams. A newel stair is located in the re-entrant angle between the east and south wings. On the first floor of the south wing, the west room is also panelled with small square panels and features an elaborate cornice. There is a small door in the south-east corner with cockshead hinges, a four-light chamfered mullion and transom window (formerly five-light), and a panelled door in a four-centred arch opening.

Local climate

Porch House receives an average of 820 mm of rain a year. This makes it wetter than 51% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 55% of listed buildings.

It experiences an average of 33 freeze-thaw cycles a year, fewer than 54% 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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  • No EPC on record for this property
  • No sale records on file
  • Related listed building consents — 2 applications
  • 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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