Walnut Cottage and Lonmay is a Grade II listed building in the Three Rivers local planning authority area, England. First listed on 3 October 1985. A C17 House. 1 related planning application.

Walnut Cottage and Lonmay

WRENN ID
riven-moulding-woodpecker
Grade
II
Local Planning Authority
Three Rivers
Constituency
South West Hertfordshire MP: Mr Gagan Mohindra (Con)
Country
England
Date first listed
3 October 1985
Type
House
Address
Walnut Cottage and Lonmay, Dunny Lane, Sarratt, WD3 4NP
OS grid reference
TL 035 008
Coordinates
51.69714, -0.50366
Source
Historic England listing

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

Description

Walnut Cottage and Lonmay are a house, now divided into two dwellings, dating to the late 17th century, with a 20th-century extension. The structure is primarily red brick, with some timber framing. The roof is tiled. The original plan was a broad two-cell lobby entry design. The house is two storeys high, and features a 20th-century gabled brick porch. The front elevation has timber casement windows: three lights with cambered heads on the ground floor, and two lights on the first floor. A central ridge stack is present. The gable end brick walls have straight joints. A two-light casement window is visible in the right gable. A single-story 20th-century extension is situated to the right, providing an entrance to Lonmay. A two-story, two-bay 20th-century extension extends to the left, with a slightly lower ridge. The rear elevation displays exposed timber rails, posts, and studs, along with scattered two-light casement windows, an entrance, and one gabled dormer. Inside, angled struts clasp the purlins.

Local climate

Walnut Cottage and Lonmay 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 84% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 83% of listed buildings.

It experiences an average of 33 freeze-thaw cycles a year, fewer than 54% of listed buildings. Of these, 15 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.
  • Sale history — 2 transactions since 2020
  • Related listed building consents — 1 application
  • 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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