Flood checks in ten minutes
Three free checks cover most of what the registers know about flooding at an address.
Long-term flood risk
Start with the GOV.UK service Check your long term flood risk. Since January 2025 it has used the Environment Agency’s new national flood risk assessment. Enter the postcode and it shows the risk from rivers and the sea, and from surface water: heavy rain the drains can’t carry away. It also covers reservoirs and, where there’s data, groundwater, and shows how the risk could change with climate change.
The chance of flooding in any one year, for the area.
It rates the area, not the home, and leaves out blocked drains and burst pipes. The rivers-and-sea rating allows for flood defences. The reservoir map shows where water could go if a large reservoir failed, which is very unlikely: a worst case, not a yearly chance. The data is revised from time to time, so look again before you exchange.
A chance each year grows over the years you own a home.
What a flood band means over the years you own it.
High means at least 1 in 30 a year. Over 25 years, the chance of at least one flood is at least 57%.
Flood zones
The flood map for planning puts every place in England in flood zone 1, 2 or 3. Zones look only at rivers and the sea, and they ignore flood defences.
| Flood zone | Chance each year from rivers | From the sea |
|---|---|---|
| Zone 1 | Under 0.1% | Under 0.1% |
| Zone 2 | 0.1% to 1% | 0.1% to 0.5% |
| Zone 3 | 1% or more | 0.5% or more |
So a home in zone 3 can still show a lower risk on the first service, because defences protect it. Zones matter most if you plan to build: a planning application in zone 2 or 3, even for a small extension, needs a flood risk assessment.
Flood history
Maps show chance, not history. The seller’s Property Information Form, the Law Society’s TA6, asks whether the property has flooded, garden included, from surface water, groundwater, rivers, the sea or sewers. A seller who doesn’t know must say so. The Environment Agency will also email its flood history for the address within 20 working days, though it may charge and doesn’t hold records everywhere.
What your conveyancer adds
Your conveyancer’s environmental search looks for risks such as flooding and contaminated land. Near water, a separate flood search can be added. Read the results before you exchange.
Found a flag on an address you like? The asking can be checked as well as the risks. See it against the sales
Insurance: get a quote before you exchange
The Law Society warns buyers that flood risk may affect their ability to get buildings insurance and a mortgage. A house normally needs insuring from exchange of contracts, so get a real quote for the address before you exchange, ideally before you offer. Look at the flood excess, not just the premium. For a leasehold flat, the freeholder usually insures the building and you pay a share. Ask whether that policy covers flood.
Flood Re
Flood Re makes flood cover more widely available and affordable. It works behind insurers: you buy an ordinary home policy, and the insurer can pass the flood risk to Flood Re. It runs until 2039, when insurers are expected to price flood cover on the actual risk. A home must meet all its conditions, including these:
| Condition | What it means |
|---|---|
| Built before 1 January 2009 | Newer homes aren’t covered. An older home rebuilt after demolition still counts. |
| A private home | Used as a home, not a business, with a domestic council tax band from A to H. |
| A house, or a building of up to three homes | A block of more than three flats isn’t covered for the building, though each resident’s contents can be. |
| Insured in a person’s name | Homes owned and insured by a company aren’t covered. |
If the home doesn’t qualify, a new build from 2009 on for example, get quotes early. If flood protection is fitted, tell your insurer.
Noise: maps, flight paths and a second visit
Defra’s strategic noise maps estimate road and rail noise across England. The latest round, published in October 2024, models 2021 and covers every public road and railway for the first time. You can find them through Defra’s Explaining the 2022 noise maps page, which links the road and rail noise maps on the government’s environment data site. They’re modelled yearly averages at 4 metres above the ground, so treat them as a guide to the street, not a reading from your bedroom.
| On the map | What it measures |
|---|---|
| Lden | A 24-hour yearly average. Evening noise counts 5 decibels extra and night noise 10 extra, because it disturbs people more. |
| Lnight | The yearly average from 11pm to 7am. |
| LAeq,16h | The yearly average from 7am to 11pm. |
Higher is louder. For scale, the World Health Organization’s noise guidelines for Europe recommend road traffic noise below 53 decibels Lden and 45 at night, and aircraft noise below 45 and 40.
Flight paths
Airports make their own noise maps, and some publish flight trackers. Heathrow’s WebTrak My Neighbourhood, for example, shows where aircraft fly and how often each route is used. Flight paths can change: the Civil Aviation Authority’s Airspace Change Portal lists proposals, searchable by postcode.
Go and listen
Visit once at rush hour and once late on a weekday evening. Stand in the garden and the main bedroom with the window open. Listen for what the maps leave out: a pub, a school, deliveries.
What to ask, and how it fits your offer
Start with the advert, then ask the agent directly about flood risk and any past flooding. Keep the answers in writing. Then tick these off before you offer.
A flood or noise flag is a cost and a question, not a verdict.
Put the costs in your sums: the premium and excess, any protection you’d fit, any extra survey. Ask your broker whether the lender will want anything more. Then check the sales you’re comparing with. If they share the flood zone or the main road, you’re comparing like with like. If not, it’s a fair question for the agent.
Questions
How do I check flood risk for a postcode?
Use the free GOV.UK service Check your long term flood risk. It rates the area, not the home, for rivers and the sea, surface water, reservoirs and, where there’s data, groundwater.
Is my house in a flood zone?
Look it up on the flood map for planning. Zone 3 has the highest chance of flooding from rivers and the sea. Zones ignore defences and surface water, so check long-term risk too.
Does “very low” risk mean the home won’t flood?
No. For rivers and the sea, it means under a 0.1% chance a year, for the area. Ask the seller about flood history too.
Where can I see a road noise map for England?
Defra’s strategic noise maps estimate road and rail noise across England, most recently for 2021. They’re averages, so visit at rush hour and at night too.