Guardian Housing has reported that councils along England's east coast have demolished at least 183 homes over the past 16 years after judging them too vulnerable to coastal erosion and landslides. The properties were removed proactively once they were considered unsafe to occupy, with affected communities across Yorkshire and East Anglia.
This is a slow moving but persistent loss of housing. Rather than waiting for buildings to collapse or be undercut by the sea, local authorities have stepped in to clear homes that could no longer be protected at reasonable cost, leaving residents to relocate away from the shoreline.
The lowest lying postcode district
| District | Post town | Region | Avg elevation |
|---|---|---|---|
| EN77 | Waltham Cross | 0m | |
| GY1 | 0m | ||
| GY2 | 0m | ||
| GY3 | 0m | ||
| GY4 | 0m | ||
| GY5 | 0m | ||
| GY6 | 0m | ||
| GY7 | 0m | ||
| GY8 | 0m | ||
| GY9 | 0m |
Postcode elevation data offers a different way to look at vulnerability to water and land movement. The lowest lying postcode district in the dataset supplied to Postcodes UK is EN77, which covers Waltham Cross. It records an average elevation of 0m above sea level and a peak elevation of 0m. That means the entire sampled area sits at sea level with no higher ground recorded within the district.
This example is not part of the east coast erosion story. Waltham Cross is inland, so it does not face direct coastal erosion in the same way as the Yorkshire or East Anglian communities reported by the Guardian. However, a district with both an average and a maximum elevation of 0m shows how low lying land can leave homes more exposed to water related risks, including surface water flooding and long term changes in groundwater or river levels.
Residents in east coast communities have watched the shoreline move closer for years, but the decision to demolish a home is never taken lightly. Elevation records such as the EN77 figure show how little room for error exists in the lowest lying places. Even where the cause is not coastal, an average and peak of 0m leave no natural fall for drainage or floodwater.
Why elevation matters for vulnerable homes
Coastal erosion removes the land under a house, but elevation is one of the first measurements used when councils assess whether a property can remain safely occupied. A home at sea level has little buffer if defences fail or if storm surges push water inland. The Guardian's reporting shows what happens when that buffer disappears altogether, homes are demolished because the ground can no longer support them.
EN77 gives a single, stark reference point: a postcode district with no elevation above zero metres. While the east coast losses involve land being eaten away, low lying inland districts face a different set of pressures. The postcode data does not suggest that Waltham Cross is affected by coastal erosion, only that it is the lowest lying district in this particular dataset. It is one example, not a summary of the whole region.
The data behind this
The coastal erosion reporting is based on exclusive figures obtained by Guardian Housing. The elevation figures for EN77 are drawn from the Postcodes UK dataset supplied for this article.
In response to reporting by Guardian Housing. Analysis and figures by Postcodes UK.