Roundoak is a Grade II listed building in the Runnymede local planning authority area, England. First listed on 17 November 1986. House. 3 related planning applications.

Roundoak

WRENN ID
waiting-thatch-plum
Grade
II
Local Planning Authority
Runnymede
Constituency
Windsor MP: Jack Rankin (Con)
Country
England
Date first listed
17 November 1986
Type
House
Address
Roundoak, Bishopgate Road, TW20 0YW
OS grid reference
SU 987 719
Coordinates
51.43779, -0.58025
Source
Historic England listing

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

Description

Roundoak is a large house built in the early 19th century. The east entrance front was remodeled in the 1950s by Sir Albert Richardson KCVO, PPRA. The exterior is roughcast with a low-pitched hipped roof made of Westmorland slate and features five chimney stacks on the main building. The house has two storeys and includes an entrance porch with Corinthian columns, a panelled door, and a fanlight.

On the north elevation, there is a tented verandah supported by delicate wood features with arched designs. The west elevation has a verandah that wraps around a semi-circular two-storey bay, which has eight-pane French windows, with matching six-pane casements above. There is a lower two-storey wing to the south with a low-pitched hipped roof in the center. This wing features three 12-pane sash windows over an entrance door flanked by a pair of eight-pane sashes, while the end wings have 12-pane sashes above two 15-pane sashes. A later bow window is located at the south end.

Inside, the house boasts a good staircase. The sitting room features a marble fireplace with a carved wood overmantel, while the drawing room has an Adam style fireplace. The dining room includes a marble fireplace with two Ionic columns at the east end. All principal rooms are adorned with decorative plaster ceilings and moulded panelled doors.

Local climate

Roundoak sits in a drier-than-average part of the UK, with an average of 720 mm of rain a year. This makes it drier than 81% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 72% of listed buildings.

It experiences an average of 33 freeze-thaw cycles a year, fewer than 53% 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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  • Full EPC report — heating system, energy costs, size, glazing, construction etc.
  • No sale records on file
  • Related listed building consents — 3 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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