Flood risk insurance when buying a house: what to prove before exchange

Is the property eligible for Flood Re?

Eligibility decides whether the insurer can cede the flood risk to Flood Re at a capped reinsurance cost, or has to price it in full. It does not fix your premium either way, so get an address-specific written quote regardless. Check eligibility before you offer, not after the survey.

What lenders and insurers worry about

Insurers look at river and sea risk, surface water risk, claims history, flood depth, property resilience, and local defences. Lenders usually focus on whether acceptable buildings insurance will be in place.

Flood Re is the mechanism behind most of this. It is a government-backed reinsurance scheme funded by a levy on UK home insurers: when an eligible policy is written on a flood-risk property, the insurer can cede the flood element into the Flood Re pool, and what the scheme caps is the reinsurance premium the insurer pays to do so, banded by the property's council tax band. It does not cap what you are charged. Insurers are not obliged to pass the ceded cost through, and your quote still reflects their own pricing, the excess and the rest of the risk. In practice competition means eligible properties are often quoted far closer to normal terms than the flood risk alone would suggest, but only an address-specific written quote tells you what you will actually pay.

Eligibility is the thing to check, and it turns mainly on the build date. Homes built before 1 January 2009 qualify; homes built from 2009 onwards are deliberately excluded so the scheme does not subsidise new building on floodplains. It is not owner-occupier only — landlord and buy-to-let buildings cover for a qualifying residential property can be ceded to Flood Re, as can leasehold buildings cover where the block contains no more than three residential units. What sits outside is commercial property, larger leasehold blocks, and housing-association and similar stock. If a property is outside the scheme, the quote is fully risk-reflective, and that is where the affordability problems appear.

The scheme is currently legislated to run until 2039, with the stated intent that the market transitions to risk-reflective pricing supported by property flood resilience. For a purchase you are financing over 25 to 30 years, that end date is inside your ownership, so it belongs in the resale calculation rather than being treated as somebody else's problem.

Evidence to gather before exchange

• Environment Agency, Natural Resources Wales, SEPA, or local flood-map evidence for the exact address.
• Conveyancer environmental search result, including surface water as well as river/sea risk.
• Seller disclosure of past flooding, insurance claims, flood resilience works, and any flood warnings received.
• Written buildings insurance quotes that include flood cover and state the flood excess.
• Evidence of flood doors, airbrick covers, raised electrics, pumps, non-return valves, or other resilience measures where relevant.

Questions to ask before exchange

When flood insurance risk is too much

• Walk away if you cannot obtain buildings insurance with flood cover acceptable to your lender.
• Walk away if the seller has undisclosed flood history and will not provide claim or repair evidence.
• Renegotiate if the property is insurable but only with materially higher premiums, excesses, or resilience costs.
• Pause if only river flooding has been checked; surface water can be the risk that changes the decision.

Related next steps

Frequently asked questions

Run the check before you commit

MyPropertyScan pulls property-risk signals into one buyer view so you can spot flood, subsidence, EPC, building-age, listed-status, and local-area prompts before you spend more on surveys, quotes, or legal follow-up.