What Is the Flood Risk at My Property?
A practical guide to understanding flood risk, what the Environment Agency's risk ratings mean, and how flood risk is considered as part of a RICS Home Survey.
Use the official GOV.UK service
For an accurate, property-specific flood risk assessment, use the official GOV.UK service. It's free, authoritative, and provides property-level data that no third-party tool can match.
The GOV.UK service covers England. Scotland and Wales have their own services — see below.
Flood risk is one of the most important — and most overlooked — factors in a property purchase. It affects insurance costs, mortgage availability, future saleability, and in some cases the structural integrity of the building itself. Every buyer should check it before exchange.
Understanding the Risk Levels
The Environment Agency classifies flood risk into four levels based on the annual probability of flooding. These are long-term statistical assessments — not predictions of when flooding will occur.
High Risk
Flooding is a realistic possibility in any given year. Properties in this zone are likely to face difficulties obtaining standard home insurance. Specialist flood cover is usually required and can be expensive. Mortgage lenders may also raise concerns.
Medium Risk
A meaningful chance of flooding over a typical ownership period. Standard home insurance is usually available but premiums may be higher. Worth factoring into long-term ownership costs and resale considerations.
Low Risk
Flooding is possible but unlikely in a typical ownership period. Standard insurance is generally unaffected. Still worth noting on a survey, particularly if the property has any features indicating historical flood exposure.
Very Low Risk
No significant flood risk identified by the Environment Agency. Note that very low risk from rivers and sea does not eliminate the possibility of surface water or groundwater flooding, which are assessed separately.
Three Types of Flood Risk
Flooding doesn't only come from rivers overflowing. There are three distinct types that affect UK properties, and each is assessed separately:
Rivers & Sea
The most commonly understood risk. Occurs when watercourses overflow their banks or the sea breaches coastal defences. Assessed based on modelled flood levels and existing flood defences.
Surface Water
Occurs when heavy rainfall overwhelms drainage systems, causing water to run across the ground rather than being absorbed. Increasingly common in urban areas as climate patterns shift.
Groundwater
Occurs when the water table rises to the surface, typically in low-lying areas with chalk or limestone geology. Slower to develop but can last for months.
The GOV.UK service shows flood risk for the area around a property — not necessarily the specific building. Two properties on the same street can have materially different risk profiles due to differences in ground level, drainage, and defences. For a property-level assessment, consider a specialist flood risk report.
Flood Risk and Your Survey
Flood risk is always considered as part of a RICS Home Survey. Your surveyor will note any visible signs of previous flooding — including tide marks, raised electrical sockets, replacement floor coverings, or specialist tanking — and flag whether the property appears to be in a flood-prone location.
However, a survey is not a flood risk assessment. If the GOV.UK service returns a medium or high risk rating, we strongly recommend:
- Asking your solicitor to raise flood risk enquiries as part of the conveyancing searches
- Commissioning a specialist flood risk report for property-level analysis
- Obtaining a buildings insurance quote before exchange — not after
- Checking the property's claims history through your insurer
- Asking the seller directly whether the property has ever flooded
Flood Risk and Insurance — Flood Re
Properties built before 1 January 2009 that are at significant flood risk may be eligible for insurance through the Flood Re scheme. Flood Re is a joint initiative between the government and insurance industry that makes flood insurance more affordable for high-risk properties.
Properties built after 2009, leasehold flats, and some commercial properties are excluded from the scheme. If you're buying a property in a flood risk area, always confirm whether it qualifies for Flood Re before exchange.
The Flood Re website has a full eligibility checker and guidance for buyers.
Regional Flood Risk Services
The Environment Agency covers England only. If you're buying a property elsewhere in the UK, use the relevant national service:
Concerned About Flood Risk?
Our RICS surveyors assess flood indicators as part of every survey. Speak to us before you commit.
Explore our other free guides: View all property guides →
CJ Bloor Property Consultants Limited is regulated by RICS. This page is provided for general information only. For a formal flood risk assessment, use the official GOV.UK service or commission a specialist flood risk report.
