Flood Risk Insurance Calculator
Flood risk is one of the few individual factors that can genuinely dominate a home insurance premium, sometimes tripling the cost compared with an equivalent property with no meaningful flood exposure at all. This calculator estimates the impact your specific flood risk level has on buildings and contents cover, and checks whether your property might qualify for the Flood Re scheme, which exists specifically to keep flood insurance available and affordable for eligible homes.
Flood Risk Home Insurance Estimator
Estimate home insurance costs if your property is in a flood-risk area. Includes Flood Re scheme eligibility check (properties built before 2009).
What Flood Re Actually Is (And Isn’t)
Flood Re is a government and insurance industry-backed scheme designed to keep flood cover affordable and available for homes in flood-risk areas that might otherwise struggle to get cover at all, or only at a prohibitive price. It works by allowing participating insurers to pass the flood risk element of a policy to a central Flood Re fund, capping what the homeowner pays for that specific risk. It is not automatic for every property, however — eligibility is generally limited to homes built before 2009, since more recently built homes are expected to have been constructed with modern flood-resilient standards and planning restrictions already factored in.
It is also worth understanding what Flood Re is not: it is not an insurer itself, and homeowners do not apply to it directly. It operates behind the scenes through participating insurers, meaning the practical way to access it is simply to get quotes from insurers who participate in the scheme, rather than seeking out Flood Re as a standalone provider.
Why “Medium Risk” Can Still Mean a Meaningfully Higher Premium
It is easy to assume “medium” risk means a modest, unremarkable adjustment, but the loading at medium risk is still considerably above a genuinely low-risk property — the real step change happens at high and very-high risk, where the multiplier climbs sharply again, sometimes to two or three times the base premium. This is not a smooth, gentle scale; risk categories in flood insurance tend to reflect genuinely different flood probabilities from official flood maps, not evenly spaced pricing tiers, which is why even a single category shift can move your estimate by a meaningful amount.
This is worth bearing in mind specifically when comparing a property against a similar one nearby that happens to sit in a different official risk band — even a relatively small difference in elevation, drainage or proximity to a water source can shift a property into a materially different risk category and a noticeably different insurance cost.
The Same Property, Four Risk Levels
A property with a £250,000 rebuild cost and £40,000 of contents, at low flood risk, sits at the baseline of this calculator’s estimate. Move the identical property to medium risk and the estimate rises by roughly 45%. At high risk, it climbs to roughly double the low-risk figure, and at very-high risk, it can reach over three times the original estimate — the same bricks, the same contents, the same postcode’s worth of everything except the flood exposure itself, producing a dramatically different premium purely because of that one factor.
The One Thing That Can Cut Your Premium Yourself
Unlike most rating factors, which reflect things about the property or area you cannot change, flood defences are a genuine, actionable way to reduce the premium — measures like flood barriers, air brick covers, and non-return valves on drains can measurably lower the assessed risk and are reflected as a discount in this calculator. This is one of the few places in home insurance pricing where a homeowner can directly influence the outcome through a physical investment in the property, rather than simply accepting whatever the underlying risk factors produce.
Local council or government grants are sometimes available toward the cost of installing property-level flood defences in higher-risk areas, which is worth researching before assuming the full cost falls entirely on the homeowner — the combination of a grant reducing the upfront cost and an ongoing insurance discount can make defences considerably more worthwhile than the insurance saving alone would suggest.
Why the Excess Is Higher Here Too
It is not just the annual premium that rises with flood risk — the typical excess specifically applicable to a flood claim also increases at higher risk levels, sometimes considerably above a standard buildings or contents excess. This reflects the same underlying risk assessment driving the premium itself: insurers use a higher excess partly to keep the premium itself more manageable, shifting a larger share of a smaller, more likely claim back onto the policyholder while still providing cover for a genuinely major flood event. If flood risk is just one factor in a wider buildings and contents decision, our Buildings and Contents Insurance Calculator covers the fuller picture, and our Home Insurance Calculator is useful for a general standalone estimate.
Frequently Asked Questions
How do I find out my property’s flood risk level?
The government’s flood risk checker, available on GOV.UK, gives an official risk assessment for any UK address based on rivers, sea and surface water flooding, and is the standard starting point before assuming a risk level.
Does Flood Re cover both buildings and contents?
Yes — for eligible properties, the scheme can apply to both elements of a combined buildings and contents policy, not just the buildings portion.
Are new-build homes always excluded from Flood Re?
Generally yes, for homes built from 2009 onward, reflecting the assumption that more recent planning and building standards already account for flood risk more thoroughly than older housing stock.
Does a previous flood claim always increase my premium significantly?
Generally yes, and the effect can compound with an already elevated risk level, since a genuine previous claim confirms the theoretical risk has materialised, which insurers weigh accordingly.
Is Flood Re a permanent scheme?
It was established with a defined operating period, currently intended to run into the following decade, with an expectation that flood risk pricing will become more sustainably reflected in standard premiums over time as the scheme winds down.
Does installing flood defences guarantee a lower premium?
It typically helps and is reflected as a discount by many insurers, but the exact effect varies by provider and the specific measures installed — some insurers weigh recognised, professionally installed defences more heavily than DIY measures.
Important Information
This calculator provides an estimate for general information purposes only and does not constitute insurance advice or a quote, and does not confirm Flood Re eligibility. Confirm your property’s specific flood risk and Flood Re eligibility directly via floodre.co.uk or with an insurer. See our Disclaimer for further information.