Flash floods in summer are becoming more frequent, often triggered by intense downpours on dry, compacted ground. One in five UK properties is at risk from surface water or flash flooding — even those far from rivers or the sea. Flood hotspots in summer include Greater London, the Southeast, and East of England.
Urban development and changes to outdoor spaces are contributing to the problem — a growing number of homeowners are replacing gardens with non-permeable driveways or artificial grass, which reduces natural drainage and increases flood risk.
Aviva's recommended steps to make your property more flood-resilient
- Use permeable materials like gravel or block paving
- Keep drains clear of debris
- Install rainwater collection systems like water butts
- Check your flood risk status via the Environment Agency
- Consider partial landscaping changes to improve water runoff