Portlands Cottage is a Grade II listed building in the Bromley local planning authority area, England. First listed on 22 October 1971. Cottage.

Portlands Cottage

WRENN ID
gentle-pinnacle-bone
Grade
II
Local Planning Authority
Bromley
Constituency
Sevenoaks MP: Laura Trott (Con)
Country
England
Date first listed
22 October 1971
Type
Cottage
Address
Portlands Cottage, Cudham Lane South, Knockholt, Sevenoaks
OS grid reference
TQ 453 582
Coordinates
51.30498, 0.08332
Source
Historic England listing

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

Description

Portlands Cottage is a 2-storey, 2-window building from the mid-19th century, constructed of flint rubble with alternating block red brick quoins and jambs, as well as lacing courses. The north and west sides are rendered. It features a double span roof with a moderately low pitch, covered in slate. The windows are recessed sash types with glazing bars, and basement windows are visible from the road front. Portlands Cottage is part of a group that includes the Oast house, drying shed with attached walls, and stable buildings.

Local climate

Portlands Cottage receives an average of 750 mm of rain a year. This makes it drier than 70% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 71% of listed buildings.

It experiences an average of 37 freeze-thaw cycles a year, more than 67% of listed buildings. Of these, 18 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
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  • 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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Nearby listed buildings

  1. Stable Buildings to North East of Former Drying Shed on Portlands Estate Grade II 16 m
  2. Oast House and Drying Shed to North of Portlands and Attached Walls to South and East of Oast Grade II 33 m
  3. Portlands Grade II 63 m
  4. Flint House Grade II 529 m
  5. Burlings Cottage Grade II 717 m
  6. Outhouse and Garden Wall to North of Burlings Cottage Grade II 719 m
  7. Franklow Grade II 734 m
  8. Bombers Farmhouse Grade II 957 m
  9. Letts Green Farmhouse Grade II 1.2 km
  10. Brasted Hill Farm House Grade II 1.3 km