Flood Zone Checker

Is my house in a flood zone?

You can answer this for any UK address in about two minutes, for free, without giving anyone your details. The harder question is the one that follows: a flood zone is a planning label, and it is not the same as the risk rating your insurer and lender actually price against.

The short answer

Look the address up on your nation's official flood map, then read two separate results: the flood zone, which ignores flood defences and drives planning decisions, and the risk rating — very low, low, medium or high — which accounts for defences and is what insurers use. A defended property can sit in Zone 3 and still be rated low risk. A property in Zone 1 can still flood from surface water.

MyPropertyScan editorialNot a surveyor

Last updated: 24 August 2026. Editorially reviewed: 24 August 2026.

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National data study

Compare city flood risk across England

Our UK Property Flood Risk Index 2026 ranks 39 English cities using Environment Agency NaFRA2 data and shows why surface-water flooding is often the overlooked buyer risk.

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Where to look up your address

Flood mapping is devolved, so the right service depends on where the property is. All four are free and none of them require an account.

Nation	Official service	What it returns
England	Environment Agency, long-term flood risk service	Rivers and sea, surface water, reservoirs and groundwater, each rated separately at address level.
Wales	Natural Resources Wales, flood risk map	Rivers, sea and surface water, with the flood map for planning shown separately from the risk rating.
Scotland	SEPA, flood maps	River, coastal and surface water likelihood, presented as high, medium or low rather than as numbered zones.
Northern Ireland	Department for Infrastructure, flood maps NI	Fluvial, coastal and pluvial layers, with a separate historic flooding layer.

In England the service is at check-long-term-flood-risk.service.gov.uk. Enter the postcode, then pick the specific property — risk can change materially between two ends of the same street, so a postcode-level answer is not good enough on its own.

Flood zone and flood risk area are different things

This is the single most common misreading. Flood Zones 1 to 3 come from planning policy and are deliberately calculated as if flood defences did not exist. That is the correct approach for deciding where to allow new building, and a misleading one for judging an existing, defended home. Large parts of central London sit in Zone 3 behind the Thames Barrier.

Zone	Annual chance, defences ignored	What it usually means in practice
Flood Zone 1	Less than 0.1% annual chance from rivers or the sea	No flood constraint in planning terms. Surface water still needs checking separately.
Flood Zone 2	Between 0.1% and 1% annual chance from rivers, or 0.1% to 0.5% from the sea	Usually insurable at standard terms. Lenders rarely comment.
Flood Zone 3	1% or greater annual chance from rivers, 0.5% or greater from the sea	Premium loading is common. Flood Re eligibility matters on pre-2009 homes. This is as far as the national map goes.
Zone 3a / 3b split	3b is functional floodplain — land that has to flood. 3a is the rest of Zone 3.	Not shown on the national map. The split is drawn in the local authority's Strategic Flood Risk Assessment.

One thing the national map will not give you is the 3a versus 3b split. Functional floodplain — Zone 3b — is defined by your local planning authority in its Strategic Flood Risk Assessment, usually published on the council's planning policy pages, and it can include land that is already developed. If you need that distinction, for a planning application or an extension, it comes from the council rather than from the address lookup.

The risk rating is the number that matters for money. If the map says your house is in Zone 3 but rated low risk because of defences, say exactly that when you request an insurance quote — some quote engines only read the zone.

River, surface water and groundwater are separate checks

Flood zones only describe rivers and the sea. They say nothing about the flood type that catches most people out.

Rivers and the sea. Predictable, mapped in detail, usually defended, and the layer flood zones describe.
Surface water. Rain overwhelming drains and running off hard ground. It affects homes nowhere near a river, and it is the layer most likely to be missed. The July 2021 London floods damaged over a thousand homes this way.
Groundwater. The water table rising into basements and floors, common on chalk and in some former mining areas. Slow, persistent, and awkward to insure.
Reservoirs. Very low likelihood, very high consequence. Shown separately and rarely affects insurance pricing.

What it means for your insurance

Flood Re is the part worth understanding properly. It is a government-backed reinsurance scheme that lets insurers pass the flood element of a buildings policy into a shared pool, which is what keeps premiums near-standard on higher-risk homes.

Homes built before 1 January 2009 are eligible. Homes built from 2009 onwards are not, by design, so that new building on floodplains is not subsidised.
It covers residential buildings and contents insurance. Leasehold blocks, buy-to-let in some cases, and commercial property fall outside it.
The scheme is currently legislated to end in 2039, with the stated intention that risk-reflective pricing takes over. That matters for a long-term hold, not for this year's renewal.

If you are buying rather than already living there, see flood risk insurance when buying a house for how to get a quote before exchange rather than after.

What it means for your mortgage

Lenders very rarely refuse on flood risk alone. What they want is evidence that buildings insurance is available at an acceptable cost, because the insurance is what protects their security. In practice the sequence is: the conveyancer's environmental search reports the risk, you obtain an insurance quote for the address, and the lender releases funds once cover is confirmed. Problems appear when no mainstream insurer will quote, not when a map shows a colour.

What to do if you are in one

1Check your buildings policy actually includes flood, and find out whether it is priced through Flood Re. Ask the insurer directly — it is not always stated.
2Register for free flood warnings for the address. In England that is the Environment Agency's warning service; the other nations run equivalents.
3Look at property flood resilience: non-return valves on drains, raised electrical sockets and consumer units, flood doors and airbrick covers. These reduce damage and, increasingly, feed into pricing.
4Keep the paperwork. Documented works and a current insurance quote are the two things that most reduce buyer hesitation when you eventually sell, and both are disclosable on the TA6 form anyway.

Cities covered

Flood risk varies street by street, so a city page can never be the final answer for one address. What it gives you is the context the map leaves out: 46 UK cities, the actual rivers and drainage systems, named flood-prone neighbourhoods, recent flood events, and the local schemes that change the picture. For a coastal example, the flood risk around Southampton Water shows how tidal corridors and surface-water pockets can matter on the same search.

Frequently asked questions

Is my house in a flood zone?

Look the address up on your nation's official flood map: the Environment Agency long-term flood risk service in England, Natural Resources Wales in Wales, SEPA in Scotland, or the Department for Infrastructure flood maps in Northern Ireland. Enter the postcode, then pick the specific property, because risk can change materially between two ends of the same street. Each service returns a flood zone or band and, separately, a risk rating that accounts for flood defences.

Is my house in a flood risk area?

Flood zone and flood risk area are not the same thing. Flood Zones 1, 2 and 3 are planning designations that ignore flood defences, so a defended property can sit in Zone 3 and still have a low actual likelihood of flooding. The Environment Agency's separate risk rating — very low, low, medium or high — does account for defences, and it is the figure insurers and lenders care about.

How do I check if a house is in a flood zone?

Run the free check above for any UK address in about two minutes, with no details required. Before you buy, also rely on the conveyancer's environmental search for the version your lender will accept, and ask the seller's TA6 property information form whether the house has flooded before.

Does flood zone affect home insurance?

It can raise the premium or the excess, and in high-risk cases push the property to a specialist insurer. Flood Re, the government-backed reinsurance scheme, caps the flood element of buildings insurance for most homes built before 1 January 2009, which is why eligibility matters far more than the zone number. Homes built from 2009 onwards are excluded, and the scheme is currently due to end in 2039.

How accurate are flood risk maps for my exact address?

National flood maps are good directional evidence, but they are not exact-address certainties. Risk can change materially between two ends of the same street, so always look up the specific property rather than just the postcode. The maps also miss detail: the Zone 3a/3b split comes from the local council's Strategic Flood Risk Assessment rather than the national map, and defences that lower real-world risk are reflected only in the separate risk rating, not the zone number. For the version a lender or insurer will rely on, use the conveyancer's environmental search alongside the free public check.

Which UK cities have the highest flood risk?

Hull has the highest proportion of properties at surface water flood risk among English cities. York, Nottingham and Gloucester have significant river flood risk due to their positions on major rivers. Coastal cities including Portsmouth, Southampton and Brighton face tidal risk. For the full comparison, see the MyPropertyScan Property Flood Risk Index.

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Flood-zone signals where available, with the manual follow-up checks spelled out.

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Related guides

UK Property Flood Risk Index 2026, the downloadable ranking of 39 English cities by Environment Agency flood-risk data.
Buying a house with flood risk, the same checks framed around an offer, insurance and next steps.
Flood risk insurance when buying
Environmental search when buying a house , what the conveyancer's flood risk search covers and what it costs.
Subsidence risk when buying
House buying checklist

How MyPropertyScan produces this guide, and what it is not

Published by MyPropertyScan and written by Ziad Nasr, who is accountable for its accuracy. No page here is written or reviewed by a chartered surveyor, conveyancer or regulated adviser, and we do not claim otherwise.

This page is not:

Chartered surveying — we do not inspect properties or produce RICS Home Survey reports
Legal advice — we do not act as conveyancers or advise on title, tenure or contracts
Mortgage or insurance advice — we are not regulated by the FCA and give no recommendations

Figures and process steps come from the published UK datasets and standards listed on this page, not from professional practice. Pages are updated when source coverage, survey cost assumptions, or lender and legal requirements materially change. Dataset limitations are set out on the methodology page.

Spotted something out of date or wrong? Email hello@mypropertyscan.com and we will correct it and change the update date.

Sources used

We use UK public and specialist sources where they are available. Public datasets can be incomplete, delayed, or missing for some addresses. Treat them as a starting point, not as a replacement for professional advice.

Source standard: preference goes to official government datasets, statutory bodies, professional standards, and primary dataset publishers. We cite the source family on the page and explain coverage limits rather than filling gaps with unsupported estimates.

Check this with: Environment Agency long-term flood risk mapOfficial flood-risk service for England, including river, sea, surface water, reservoir and groundwater where available.
Data source: HM Land Registry Price Paid DataRegistered residential sale prices for England and Wales.
Official register: Energy Performance Certificate RegisterPublic EPC certificate lookup for an address, postcode, street or certificate number.
Data source: British Geological Survey Engineering Geology (1:1 million)National-scale bedrock and superficial-deposit mapping used as a directional ground indicator, not parcel-level GeoSure data or a site investigation.
Data source: Copernicus CAMS via Open-MeteoCurrent modelled PM2.5, NO₂ and European AQI from a nearby CAMS grid cell.
Data source: DEFRA Environmental Noise Directive mappingMapped road and rail noise contour data for England, classified into MyPropertyScan's low/moderate/high bands, and separate from the CAMS air-quality source.
Data source: Police.uk crime dataOpen street-level crime data for England, Wales and Northern Ireland.
Check this with: Ofcom broadband checkerOfficial checker for broadband availability and speeds.
Check this with: Ofcom mobile coverage checkerOfficial predicted mobile coverage by network.
Data source: Food Standards Agency food hygiene ratingsPublic register used to identify nearby food and drink venues.
Official register: Ofsted inspection reportsSchool and provider inspection report lookup for England. Fee-paying schools come from the DfE Get Information About Schools register, since around half are inspected by ISI and carry no Ofsted grade.
Official register: Historic England National Heritage ListListed buildings, scheduled monuments and other protected heritage entries in England.

General information only. Not legal, mortgage, insurance, or surveying advice. Always confirm with your own surveyor, broker, and conveyancer before making decisions. MyPropertyScan is operated by BiteRight Ltd.