How much does a flood risk assessment cost?
A flood risk assessment typically costs £650 to £2,500 for a small site.
£650 to £2,500
For a small site
Prices are typical UK ranges drawn from firms’ published prices and cost guides, last checked 6 October 2026. They are a guide only: every firm sets its own prices, so get quotes for your own project. Some firms quote before VAT and some include it, so ask which a quote is.
Example prices
| Job | Typical price |
|---|---|
| Single dwelling in Flood Zone 1, basic report | From about £650 |
| Desk-based FRA, householder in Flood Zone 2 | £400 to £800 |
| Site-specific FRA, minor development | £800 to £2,500 |
| Full FRA with hydraulic modelling, major scheme | £3,000 to £15,000 or more |
What changes the price
- Flood zone (Zone 1 with surface water only vs Zones 2 and 3)
- Site size and vulnerability of the use (housing, care home vs garage)
- Number of flood sources: river, tidal, surface water, groundwater
- Whether hydraulic modelling is needed (biggest cost driver)
- Drainage strategy / SuDS design as an add-on
- Local authority or Environment Agency requirements and sequential/exception tests
Larger schemes
The range above covers small sites. A full assessment with hydraulic modelling for a larger scheme can cost £3,000 to £15,000 or more, and should always be quoted individually. Only a handful of firms publish prices, and several say a flat price is not realistic.
How to get a fair quote
- Check the flood zone first. A site in Flood Zone 1 with no other risks is much cheaper than one in Flood Zone 2 or 3.
- A very low quote is probably a desk study. Ask whether the council will accept it for your type of application.
- Get at least three quotes for the same job, and compare what each includes as well as the total.
- Check the provider’s accreditation. See how we check listings.
Common questions
How much does a flood risk assessment cost?
A flood risk assessment typically costs £650 to £2,500 for a small site. Some firms quote before VAT and some include it, so ask which a quote is.
Why do quotes vary so much?
The main things are: flood zone (Zone 1 with surface water only vs Zones 2 and 3); site size and vulnerability of the use (housing, care home vs garage); number of flood sources: river, tidal, surface water, groundwater; whether hydraulic modelling is needed (biggest cost driver).
Does the price include VAT?
Some firms quote before VAT and some include it, so ask which a quote is. Always check before you accept.
How do I get a fair price for flood risk assessment?
Get at least three quotes for the same job, and compare what each includes as well as the total. Check the provider’s accreditation and ask for a fixed price where you can.
Where these prices come from
Researched in October 2026 from the sources below, which we compared against each other. Where sources disagreed we used the range that covered most quotes. These sites are independent of us.
- Unda - Flood risk assessment cost: what drives the price
- Planning Signal - Flood risk assessment for planning
- Unda - Flood risk assessment for planning
Read next: what flood risk assessment is and when you need it.