Flood risk activity permits: when you need one and the cost
A flood risk activity permit is a separate Environment Agency consent that planning permission does not replace. Which distances trigger it, which exemptions exist and how the charges work.
If your works are in, over, under or within eight metres of a main river, within eight metres of a flood defence structure or a culverted main river, or within sixteen metres of a tidal main river or sea defence, you probably need a flood risk activity permit from the Environment Agency as well as planning permission. The flood risk activity permit cost is set by the Environment Agency's published charging scheme rather than by the council, and the permit is a separate consent that planning permission does not replace.
This catches developers out most often on small sites where a culvert or a raised bank runs along a boundary nobody surveyed.
Activities that need a permit rather than a consent
Flood defence consent under the Water Resources Act 1991 was replaced in April 2016 by flood risk activity permitting under the Environmental Permitting (England and Wales) Regulations 2016. The permitting regime now covers work on or near a main river, a flood defence or a sea defence, and work in a floodplain where it could affect flood flow or storage.
Two separate regimes run alongside each other, and mixing them up wastes weeks.
| Watercourse or structure | Consent needed | Who grants it |
|---|---|---|
| Main river, or within 8 metres of its bank | Flood risk activity permit or registered exemption | Environment Agency |
| Tidal main river or sea defence, within 16 metres | Flood risk activity permit | Environment Agency |
| Environment Agency flood defence or culverted main river, within 8 metres | Flood risk activity permit | Environment Agency |
| Ordinary watercourse (ditch, brook, non-main river) | Land drainage consent under the Land Drainage Act 1991 | Lead local flood authority, or internal drainage board |
Whether a watercourse is a main river is a matter of fact, not judgement: the Environment Agency publishes the main river map, and the designation can change where a watercourse has been reclassified. Check it against the site boundary rather than against the blue line on an ordnance plan.
The eight-metre measurement runs from the top of the bank, or from the landward toe of a raised defence, which on a site with a steep bank can push the permit boundary further into the developable area than the drawings suggest.
Exemptions, exclusions and the registered route
Not every activity near a main river needs a bespoke permit. The 2016 Regulations provide a list of exempt flood risk activities that can be registered with the Environment Agency instead, typically low-risk work such as certain minor repairs, small structures or temporary works carried out under stated conditions. Registration is free of charge and much faster, but the conditions attached to each exemption are specific and failing them puts the activity back into the permitting regime.
There are also exclusions where the activity falls under another consenting regime, and there are standard rules permits for activities that follow a published rule set. Read the gov.uk guidance on flood risk activity environmental permits before assuming which route applies, because the exemption list is amended from time to time.
A common mistake is treating the exemption as a design conclusion. Check that the proposal meets every condition of the exemption, including those about the distance from the defence and the duration of the works.
Charges and how they are structured
The Environment Agency recovers its costs through the environmental permitting charging scheme, which sets an application charge for each category of flood risk activity and, for some permits, an annual subsistence charge. Charges differ between a standard rules permit and a bespoke permit, and a bespoke permit covering several activities is charged accordingly.
The scheme is revised, so quote the current schedule rather than a figure from a previous project. Build three cost lines into the budget: the application charge, the consultant time to prepare the drawings and method statements the Agency expects, and any design change the determination produces, such as a longer span or a different foundation arrangement to keep the structure clear of the defence.
For comparison against the rest of the consenting budget, the PlanScope pricing page sets out what the supporting planning documents cost, and the way a single undischargeable condition can dominate a programme is set out in the cost of a pre-commencement condition you cannot discharge.
Determination, pre-application advice and timing
The Environment Agency offers pre-application advice on flood risk activities, and for anything beyond a simple exemption it is worth paying for. The advice tells you which activities the Agency considers your works to involve, whether a bespoke permit is needed, and what modelling or drawings the application will require.
Determination periods differ by route. A registered exemption is effectively immediate once accepted. A standard rules permit is quicker than a bespoke one. A bespoke permit involving in-channel work, modelling or a new structure takes materially longer, and the clock stops whenever the Agency asks for more information. The Agency publishes its service standards, so check the current figures and programme against them rather than against a recollection.
What tends to drive the timetable in practice is the quality of the submission. Applications that arrive without a clear plan of the works relative to the defence, without levels, or without an explanation of how flood flow and storage are maintained generate a request for further information before any technical review starts.
How the permit interacts with planning permission
The two consents are independent. The Environment Agency can object to a planning application on flood risk grounds and separately refuse a permit, and a council can grant permission for something that is never permitted. Officers sometimes attach a condition requiring the permit before commencement, which is a sensible safeguard and a programme risk if the permit application has not begun.
Your Flood Risk Assessment should state plainly whether a flood risk activity permit is required, which activities trigger it, and the status of any pre-application discussion. The Agency's planning consultation response is written by people who will also see the permit application, and a flood risk assessment that is silent on permitting reads as incomplete.
Keep the Drainage Strategy consistent with it. An outfall into a main river is both a drainage design decision and a permittable activity, and the two documents should describe the same structure at the same invert level.
Sequencing the permit into the works
Order the work so the permit is not holding up everything else:
- Establish early whether any watercourse on or adjacent to the site is a main river, and whether an Environment Agency defence or culvert is within the trigger distances.
- Get pre-application advice before the layout is fixed, so the eight or sixteen metre strip is designed around rather than designed into.
- Decide between exemption, standard rules and bespoke on the basis of the activity list, not convenience.
- Prepare the permit drawings alongside the planning drawings, using the same levels datum.
- Submit the permit application early enough that a pre-commencement planning condition can be discharged without delaying the start on site.
- Keep the permit conditions in the construction documents, because they bind the contractor as well as the applicant.
The permit also survives the planning process. Its conditions on working methods, timing within the fish spawning season and reinstatement apply during construction, and breaching them is an offence under the 2016 Regulations rather than a planning matter.
Budgeting for this early is the difference between a boundary design that works and a redesign after the Agency's first response. Enter your postcode on PlanScope to see which reports a site near a main river is likely to need.
This is general guidance, not legal advice; check the position with the Environment Agency, your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Is a flood risk activity permit the same as flood defence consent?
No, it replaced it. Flood defence consent under the Water Resources Act 1991 gave way in April 2016 to flood risk activity permitting under the Environmental Permitting (England and Wales) Regulations 2016. Older planning conditions and reports sometimes still refer to flood defence consent, so read them as pointing at the permitting regime.
Who consents works to a ditch that is not a main river?
The lead local flood authority, or an internal drainage board where one covers the area, under the Land Drainage Act 1991. That is land drainage consent, a separate regime from Environment Agency permitting with its own application and charge. Check the main river map first, because the answer turns entirely on the watercourse classification.
How much does the permit cost?
The Environment Agency sets application and subsistence charges in its environmental permitting charging scheme, with different amounts for registered exemptions, standard rules permits and bespoke permits. The scheme is revised periodically, so take the figure from the current published schedule rather than from a previous project.
Can I start work if planning permission has been granted?
Not if a permit is required and has not been issued. The two consents are independent, and carrying out a permittable flood risk activity without a permit is an offence under the 2016 Regulations. Councils often add a condition requiring the permit before commencement, which makes the permit application a programme item rather than an afterthought.
Does the eight metre distance run from the water?
It runs from the top of the bank of the main river, or from the landward toe of a raised flood defence, not from the water surface. On a site with a steep or wide bank that puts the trigger line further into the plot than a plan view suggests, which is why the strip should be surveyed before the layout is fixed.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.