How do you check a property's flood risk, and what does it mean for insurance?
Through published flood maps and a specific search during conveyancing — and it matters increasingly, because flood risk affects insurability, price, mortgageability and resale rather than only the chance of water arriving.
The sources of different types of flooding, which matter because they are mapped separately and insured differently:
Rivers and sea, the best mapped and most discussed.
Surface water, from rainfall overwhelming drainage — the most widespread risk and the least understood, affecting many properties nowhere near a river.
Groundwater, rising water tables.
Sewer flooding and reservoir failure.
How to check:
Official flood risk maps, free and searchable by postcode, covering risk by source and likelihood.
A conveyancing flood search, more detailed, considering historic incidents, insurance implications and climate projections.
Ask the seller, since the standard property information form asks about past flooding and the answers are relied upon.
Check local knowledge, since near-misses and drainage problems rarely appear in records.
What it means for insurance. Flood Re exists precisely because high-risk homes were becoming uninsurable — it reinsures the flood element of home insurance, allowing affordable cover at high risk.
But the exclusions matter enormously: Flood Re does not cover homes built after 2009, nor most leasehold blocks above a size, nor buy-to-let in some circumstances, nor commercial property. The post-2009 exclusion is deliberate — it was designed to discourage building on floodplains — and a buyer of a newer high-risk home may face a market rate or no cover at all.
The scheme is also time-limited, with a planned transition toward risk-reflective pricing.
What to do if a property is at risk: obtain an insurance quote before committing, since a mortgage requires insurance; ask about property-level resilience measures, which can reduce premiums; and check whether previous claims exist, since they follow the property.
Disclosure obligations mean sellers must answer honestly about past flooding.
General information, not legal or financial advice.