Confusion over data used to offer flood insurance in mixed flood zones.

I am told the insurers use ‘Gov data’ to determine flood risk for offering flood insurance. So, in the example below, can anyone who perhaps works in insurance explain how insurers derive information from two conflicting sources run by the same Gov agency?

My son is buying a home in a street of eighteen houses. The street is surrounded by a flood plain which flooded quite badly in 2019. The ‘Gov long term flood risk website’ confirms all properties in this street are ‘very low risk’ for rivers, sea and surface water. So far, he has had no trouble obtaining insurance quotes for flood.

However: many the homes that surround this street for up to 1km radius are in flood zone three when viewing the ‘Flood map for planning’. But low risk when consulting the ‘Gov long term flood risk website’ despite 50 homes in this area being flooding in 2019. 

How can 50 homes that flooded in 2019 be categorised by planning to be in flood zone 3, but the same properties be deemed low risk for long term flooding, and insurance purposes?


  • SandtreeSandtree Forumite
    10.6K Posts
    10,000 Posts Second Anniversary Name Dropper
    Many insurers will be buying reinsurance from Flood Re and so their own opinion on the risks isn't that important as much as Flood Re's who use the Gov Long Term View

    Long term view is saying what the flood risk is assuming nothing else changes and so at the moment it doesn't sound to be too bad for where they are. The planning view however considers what will happen if more land is covered by concrete and other non-permeable materials so surface water cannot be absorbed. As such its possible to be in an area that is ok for now but would become problematic if it became more built up.

    For those that aren't buying reinsurance from Flood Re then there is the government data, several third party models like RMS, Air etc plus some large insurers may be able to come to their own view... one prior client used RMS with a loading factor for non-Flood Re cases as they found RMS was always a little too pessimistic on the likely losses. 
  • edited 12 April 2022 at 12:46PM
    CFELHCFELH Forumite
    42 Posts
    10 Posts First Anniversary Name Dropper
    edited 12 April 2022 at 12:46PM
    That has made it much clearer.

Sign In or Register to comment.
Latest MSE News and Guides

Did you know there's an MSE app?

It's free & available on iOS & Android


Regifting: good idea or not?

Add your two cents to the discussion

MSE Forum

Energy Price Guarantee calculator

How much you'll likely pay from April

MSE Tools