7 and 8, Portmill Lane is a Grade II listed building in the North Hertfordshire local planning authority area, England. First listed on 13 April 1951. Houses. 7 related planning applications.
7 and 8, Portmill Lane
- WRENN ID
- stony-rotunda-willow
- Grade
- II
- Local Planning Authority
- North Hertfordshire
- Constituency
- Hitchin MP: Alistair Strathern (Lab)
- Country
- England
- Date first listed
- 13 April 1951
- Type
- Houses
- Address
- 7 and 8, Portmill Lane, SG5 1AS
- OS grid reference
- TL 185 292
- Coordinates
- 51.94913, -0.27668
- Source
- Historic England listing
Description
Nos 7 and 8 Portmill Lane are a pair of 18th-century houses. They feature red brick fronts, with grey and plum coloured brickwork on the left side elevation. The houses have old tiled roofs and include four Yorkshire casement box dormers. They are two storeys high with attics and have six flush sash windows in moulded frames, complete with glazing bars, set under flat arches. The ground floor has flush panelled shutters. Each house has two pedimented doorways with six-panel doors, where four panels are fielded and two are flush. The doorways are topped with oblong fanlights, one of which has ornamental glazing bars, and are surrounded by Doric pilasters, entablatures, and dentil pediments.
Local climate
7 and 8, Portmill Lane 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 82% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 76% of listed buildings.
It experiences an average of 35 freeze-thaw cycles a year, more than 60% of listed buildings. Of these, 17 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 — 7 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
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
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