Coal Duty Boundary Marker is a Grade II listed building in the Sevenoaks local planning authority area, England. First listed on 21 April 1986. Marker.
Coal Duty Boundary Marker
- WRENN ID
- graven-hammer-amber
- Grade
- II
- Local Planning Authority
- Sevenoaks
- Constituency
- Sevenoaks MP: Laura Trott (Con)
- Country
- England
- Date first listed
- 21 April 1986
- Type
- Marker
- Address
- Coal Duty Boundary Marker, Birchwood Lane, Swanley
- OS grid reference
- TQ 503 699
- Coordinates
- 51.40823, 0.15971
- Source
- Historic England listing
Description
The coal duty boundary marker, erected in 1861 or soon after, is a notable cast iron structure. It was cast by Henry Grissell at the Regent Canal Ironworks. The marker is designed as a square post with chamfered edges, featuring a projecting cornice and a frieze that bears an armorial shield. This post was established under the London Coal and Wine Duties (Continuance) Act of 1861.
Local climate
Coal Duty Boundary Marker sits in a drier-than-average part of the UK, with an average of 710 mm of rain a year. This makes it drier than 85% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 85% of listed buildings.
It experiences an average of 30 freeze-thaw cycles a year, fewer than 64% 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
- No related consent applications matched
- 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.
Similar buildings
The closest matches to this building from all 493,000 UK listed buildings, by architecture, period and materials.
- 1 Coal Duty Boundary Marker at Junction with Crayford Road
- 2 London Coal Duty Marker on District Boundary at Tl 2570 0240
- 3 Coal Duty Boundary Marker (On the South Side of Number 1)
- 4 City of London Corporation Coal Duty Boundary Marker at TQ 181609
- 5 London Coal Duty Marker on North Side of River Colne, 15 Metres from Lane
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