Is My House in a Flood Zone? Understanding UK Flood Zones
If you’re looking to get planning permission for changes to your home or want to sell up soon, we’ve got you covered in this comprehensive guide to flood zones.
It’s easy to get carried away with a vision for a property extension or conversion, but before anyone gets too invested, it’s imperative to factor in the realities of securing planning and what can put a spanner in the works, such as flooding from the sea or rivers. Flood risk can also impact the ability to secure a mortgage and insurance for a home.
In the UK, 2.4 million properties are currently at high risk from flooding – and it’s predicted that this could rise to 3.2 million in 2050. Even if you think you know your flood zones, the recent updates to the Environment Agency’s flood maps now mean that homes which were previously considered safe may now be at risk, and vice versa.
We’ll talk you through flood zones, what they mean, and how to get the most out of a flood risk check for property or land in the UK.
What are the flood zone codes?
There are three main flood zones in the UK, which are outlined below:
- Flood Zone 1: Lowest risk
- Flood Zone 2: Medium risk
- Flood Zones 3a and 3b: High risk (flood plains)
What is Flood Zone 1?
Flood Zone 1 areas have less than a 1 in 1000 chance of experiencing flooding. There are not many restrictions for a flood zone 1 property, and you are likely to secure planning permission without too much hassle. However, if your property is over 1 hectare, you must still have a flood risk assessment.
What is Flood Zone 2?
In Flood Zone 2, there’s a medium-level risk of flooding. This means river flooding could occur every 100 years and sea flooding every 200 years. It’s likely that architectural designs in Flood Zone 2 could get planning permission, but only if flood resilience measures are added to the plans.
What is Flood Zone 3?
To add some complexity, Flood Zone 3 encompasses two categories: 3a and 3b. What you really want to know if you’re categorised with Flood Zone 3 is whether you can get planning permission on a flood plain.
If the land is categorised as 3a, it may be possible to develop or build property on that land with a comprehensive Flood Risk Assessment (FRA) and planning details. However, if the property or land is given the 3b category, this makes it very difficult to secure planning permission.
Latest updates to flood maps and what they mean for your property
The Environment Agency flood maps use the most up-to-date information to help homeowners, buyers, insurers and planners get a better understanding of flood risk. In 2025, there was a major update to the flood maps, introducing NaFRA (National Flood Risk Assessment) and NCERM (National Coastal Erosion Risk Map) across England.
NaFRA and NCERM both consider future climate change projections alongside existing data. It also uses a high-resolution modelling grid to show potential flood depths.
What does this mean for homeowners? Off the back of this new data model, as many as 6.3 million properties in England were identified as at risk of flooding. This means that while your property may not have been at risk previously, the new and improved data may now mean you’re living in an area flagged as at-risk by the Environment Agency.
So, if you’re aspiring to sell up or get planning permission for an extension in the not too distant future, make sure you’re confident on whether you’re in a flood zone or not, and avoid basing your assumptions on previous flood reports or research you may have done in the past.
How can I check if my house is in a flood zone?
Ashfield Solutions can do some quick preliminary checks to determine which flood zone category applies to your property or land and advise on next steps, such as whether you need a flood risk assessment or not.
There are three main types of flooding: fluvial (rivers), pluvial (surface water) and coastal. The prognosis for flooding is that all three types are increasing due to a number of factors. This includes rising sea levels from climate change, more intense storms and urbanisation which makes the ground less porous. A flood risk report flags which type of flooding your property could be affected by, as well as highlighting the potential severity.
Not sure how to find if your house is in a flood zone? Contact the team at Ashfield Solutions and we can advise.
What areas of the UK have a high flood risk?
Properties near the coast, rivers or even brooks and streams can be more vulnerable to flooding. However, surface water flooding can happen anywhere.
The West side of the UK gets more rain than the East, due to moist air blowing in from the Atlantic Ocean. However, it’s not just flooding from rivers bursting their banks and excess surface water to think about. Lincolnshire, in the East Midlands is projected to see the biggest hike in flooding incidents over the next 50 years due to rising sea levels.
In fact, coastal communities are at the highest risk of flooding, closely followed by towns and cities near rivers. Cities predicted to be most at risk include London, Glasgow, Liverpool, Cardiff and Bristol.
A report by Aviva published in 2025 flagged the 10 most at risk locations in England:
The graph shows that the top top three at risk locations include Bermondsey and Southwark, Boston and Skegness and Kingston Upon Hull North. For these areas, over 80% of the properties could be at danger of flooding by 2050. This means that if you’re considering buying or selling in these areas, specialist advice from the flood risk consultants at Ashfield will likely be needed.
These figures are considerably higher than coastal and river-based communities in Scotland and Wales. The highest at-risk location predicted in Scotland is Alloa and Grangemouth at 15.6% and the highest at-risk area in Wales is Newport East at 37.7%.
What areas of the UK are least likely to flood?
Places with a lower flood risk, due to lower rainfall and less intense storms, include the following:
- Guildford
- Southend-on-Sea
- Woking
- Reading
- Bradford
- Sheffield
It’s not just less rainfall that matters. Being positioned on higher ground, on an incline and away from coastal areas or rivers also reduces the risk of flooding.
How to find flood risk of a property?
With so many data sources and organisations available to find flood data for an area of land or property, it can be difficult to know where to start.
You could go straight to a reputable source, such as the Gov.UK website. However, even their flood risk checks are not all-encompassing. For instance, you can’t find out if a single property is liable for flooding or if flooding has occurred due to blocked drains. There are also different organisations that tackle flood risk in Scotland, Wales and Northern Ireland.
Ashfield can quickly source all the flood risk information you need.
That’s where getting support from trusted consultants can help. With specialists operating across flood risk, we can leverage our contacts and resources to confidently determine whether your property or land is at risk of flooding and what the possible next steps would be. If you’re looking to secure planning for your land or for a client, this should be your first port of call before you even draw up any plans.
That’s because if the property is situated in a flood zone, you may need to make adjustments or risk your plans being refused by the local planning authority.
It can be helpful to know that planning authorities must consult with the Environment Agency, and that’s where Ashfield’s working relationships with the right contacts, both at the council and the Environment Agency, can help you get the answers you need sooner.
We also support homebuyers, giving them the confidence to make an informed decision on whether to proceed with a purchase based on comprehensive flood risk data. We did exactly that for a property buyer in the East Midlands, who subsequently decided not to follow through on the purchase based on our findings.
The flood risk consultants at Ashfield Solutions can advise on potential adjustments that could help you secure planning if flooding is a potential problem. This could include adding details of how you’ll incorporate sustainable drainage into your land or around your property. Contact our trustworthy team today to get advice on flood risk and acquire a comprehensive Flood Risk Assessment.
We support current homeowners by supplying a comprehensive flood risk report when buying a house.
