Free Flood Risk Check UK 2026: Every Source Compared

The free Environment Agency flood map covers most of what you need before making an offer. Here's exactly how to use it, where the free check falls short, and what the £3.99 Buyer Address Report adds (insurance impact summary, historic flood records nearby).

Every UK flood-risk source compared

Step-by-step: free EA flood check

1. Go to gov.uk/check-long-term-flood-risk
2. Enter the postcode (or click the map)
3. Read the river/sea verdict (high / medium / low / very low)
4. Toggle the surface water layer, this is increasingly the bigger issue
5. Note the flood zone (Zone 1, 2 or 3) and any defences shown

Where the free check falls short

• Insurance impact, free maps don't tell you whether the property is Flood Re-eligible (pre-2009 build) or excluded
• Historical flood events at the property, the EA holds this data but doesn't expose it to public maps
• Surface water interpretation, the layer exists but the verdict is hard to read; rainfall + drainage capacity matters
• Annual probability vs visible verdict, Zone 2 means 0.1-1% annual probability, which is a lot in a 25-year mortgage
• No tie-in with other risks, flood is rarely the only risk; coal, radon, subsidence, planning all matter

What the £3.99 Buyer Report adds

• Flood zone verdict (rivers and sea) for the address
• Historic flood records nearby from the Environment Agency
• General Flood Re guidance (the scheme covers most homes built before 2009)
• Insurance impact summary (what to expect on quotes)
• Plus: indicative coal mining, radon and subsidence estimates, recent planning applications within 500m, the 12-month crime trend, nearby schools, price projections, stamp duty and mortgage estimates, sold prices on the same street, and the EPC profile
• PDF + permanent shareable link

Surface water risk is not in the Buyer Report; check it free on GOV.UK's long term flood risk service. For the British Geological Survey ground and radon bands and the Coal Authority mining check on the exact address, the £4.99 Premium report runs those lookups.

When you actually need a paid environmental search

The £60-120 standalone environmental search (Groundsure or Landmark) and the £250-450 full conveyancing pack are commissioned by your solicitor at exchange. They include formal indemnity wording you need for the transaction. The £3.99 PostcodeCheck Buyer Report is for the OFFER stage, not exchange. Use ours pre-offer to filter out flood-risk red flags cheaply; use solicitor searches at exchange.