Environment Agency Objection on Flood Risk: What It Means and How to Get It Withdrawn

An Environment Agency objection on flood risk means the Agency, as a statutory consultee, has told the council that your application should not be approved as it stands. Councils rarely grant permission against an objection that is still in place, so if nothing changes the application is likely to be refused. Most objections can be answered, though. Each letter says what the Agency needs to see, and a targeted revision or addendum to the Flood Risk Assessment that supplies it, with design changes where the numbers require them, is usually enough to get the objection withdrawn. This guide explains how to read the letter, the six objections AFC sees most often, the five steps of a response, and two AFC jobs with their numbers: one where the objection was withdrawn and permission granted, and one where the response is now with the council.

Had an Environment Agency objection? Send us the letter and the Flood Risk Assessment for a fixed fee proposal for a response. Our flood risk assessment service covers revisions and addenda written to answer consultee letters.

What an Environment Agency objection on flood risk means

The Planning Practice Guidance states that "There is a statutory requirement for local planning authorities to consult the Environment Agency" on development in flood risk areas (Flood risk and coastal change, paragraph 038, Reference ID 7-038-20220825). The Agency's reply goes on the planning file, and the case officer has to weigh it. In law the council can decide against the Agency's advice, but in practice an objection that stands at the decision date leads to refusal, or to a delay while the council asks for more information.

Three kinds of objection come up, and they call for different responses.

An objection that can be overcome. The letter names a gap: a floor level below the design flood level, lost floodplain storage, no modelled level. It usually has a heading such as "Overcoming our objection" or a closing request for "further detail". Supply what is asked for and the Agency is re-consulted.

A holding objection. The Flood Risk Assessment is missing or too thin for the Agency to comment on. The answer is a proper site-specific assessment, not a reply to individual points.

An objection in principle. The use itself is not allowed in the flood zone. Policy F6 of the National Planning Policy Framework (2026) states that "Development proposals should be refused if the use is incompatible with the risk from river or sea flooding" (NPPF Chapter 18). Compatibility is set by Table 3 of Annex F: for example, More Vulnerable development such as a dwelling is marked "Exception test required" in Flood Zone 3a and is not permitted in Flood Zone 3b, the functional floodplain. A better FRA does not overcome an objection in principle. The use, the site boundary or the flood zone evidence has to change.

Policy F7 then sets the test for safety: development proposals "should not present a risk from flooding to potential occupiers, users, or visitors", and where a site is at risk they should be refused unless, among other things, the development is safe for its lifetime, resilient, and does not increase flood risk elsewhere. Most Environment Agency letters come back to one of those conditions.

Read the letter: the six objections AFC sees most

AFC keeps a record of every consultee comment on its jobs. Across those records, these are the issues the Environment Agency has raised most often, with the number of times it raised each one.

1. Finished floor levels (12 times). The floor of the new building is below the design flood level, or above it by less than the freeboard the local Agency team asks for. EA West Midlands asks for 600 mm above the design flood level; the Greater Nottingham SFRA (2017) asks for 300 mm on minor development. The answer is a floor level in mAOD on a section, set from a modelled level, or a reasoned case for flood resistance where an extension floor has to match the existing house. Our guide to finished floor levels in Flood Zones 2 and 3 sets out the numbers.

2. Floodplain storage and level-for-level compensation (9 times). New buildings, raised ground, decking and walls take up space that floodwater used to occupy. The Agency asks for compensatory storage on site, level for level and volume for volume, up to the design flood level including climate change, usually in a table by height band with plans and sections. The floodplain compensation calculator runs the band check.

3. Vulnerability classification (8 times). The assessment has put the development in the wrong row of Annex F Table 2, or the proposal increases vulnerability (a garage becomes a bedroom, plant becomes essential infrastructure). Worked example 1 below is one of these.

4. Design flood level not evidenced (7 times). The FRA quotes a level from a distant model node, an old model, the wrong climate change allowance, or no model at all. The answer is the Agency's own data for the site, usually its Product 4 package.

5. Flood flow routes (6 times). Walls, solid fences, raised platforms or enclosed undercrofts would block water flowing across the site. The answer is open construction, flood-permeable fences and a plan showing the route left open.

6. Flood Zone 3b, the functional floodplain (6 times). The site lies in land where water has to flow or be stored in a flood. Only water-compatible uses and essential infrastructure that passes the Exception Test are allowed, and the latter must "result in no net loss of floodplain storage" (Annex F, Table 3). Check the SFRA's Flood Zone 3b map and the evidence behind it before accepting the classification; if the site is in 3b, the objection is one of principle.

How to respond: five steps

Figure 1. From objection to permission on 25/01976/FUL: objection, FRA Rev 2, the Agency's email, formal withdrawal and the decision notice.

Step 1: list every point in the letter. Find the paragraph that says what would overcome the objection and write each request down as a separate line. Answer all of them in one submission. A response that answers three points out of four is a second objection and another round of consultation.

Step 2: get the Agency's own data. If the objection turns on a flood level, use the Agency's modelled levels for the site, not an estimate. The Agency's guidance on flood risk assessments for planning applications explains that Product 4 is requested through the Flood map for planning service: "The local Environment Agency team will send product 4 information to you for that location within 20 working days." Order it on the day the objection arrives.

Step 3: answer each point in a revision or an addendum, in the form asked for. If the Agency asked for a band table with plans and sections, send a band table with plans and sections. If it asked for a floor level in mAOD, put the level on a drawing. Quote the Agency's reference on the cover and map each point to the page that answers it.

Step 4: change the design where the numbers say so. Some objections cannot be answered on paper. Plant has to go up, decking has to come out, ground has to be lowered. Agree the change with the client and the architect before the report is written, and send revised drawings with it.

Step 5: send it to the case officer and ask for re-consultation. The Agency comments on what the council sends it. Send the revised FRA or addendum, the revised drawings and a short covering note to the case officer, citing the Agency's reference, and ask the council to re-consult the Agency before the decision.

Worked example 1: the generator the Environment Agency said must stay dry (25/01976/FUL)

Application 25/01976/FUL, at Waterside Apartments, Pavilion Road, West Bridgford, Nottingham, was for the installation of a standby generator in the car park of a high-rise residential building, to power its fire-fighting lifts and life-safety systems if the mains supply fails. The site lies in Flood Zone 3 on the River Trent floodplain, behind defences. AFC prepared the Flood Risk Assessment.

Figure 2. The site and generator position inside the 1 in 100-year plus climate change flood extent (AFC FRA Rev 2, page 11).

The objection. AFC's first FRA treated the generator as non-habitable plant that would not be needed during a flood. The Environment Agency's Lower Trent team objected (LT/2025/129619/01-L01, December 2025) because the assessment did not show how flooding, including extreme events, would affect the generator. AFC queried the classification. The Agency's Planning Advisor replied by email that national policy treated electricity supply including generation as essential infrastructure, and that a flooded generator could compromise fire safety during an overtopping event. The current wording, in Annex F Table 2 of the NPPF (2026), lists "Essential utility infrastructure which has to be located in a flood risk area for operational reasons", including electricity supply that has to stay operational in a flood, and Table 3 adds that essential infrastructure "should be designed and constructed to remain operational and safe in times of flood".

The data. AFC obtained the Agency's Product 4 package for the site (EIR/2025/36206). The River Trent at Nottingham model gave a design flood level of 23.83 mAOD in the defended 1% AEP plus 30% climate change event at the model node closest to the generator, a depth of about 0.22 m on the site. The Greater Nottingham Strategic Flood Risk Assessment (2017) asks for minor development to be set at least 300 mm above that level.

The response. FRA Rev 2, issued on 14 January 2026, raised the generator to 24.13 mAOD, 300 mm above the design flood level, with an overall height of 2,440 mm. The Agency said by email the next day that it was content for the level to be conditioned. Its formal letter of 18 February 2026 (LT/2025/129619/02-L01) reads: "We rescind our previous objection and are satisfied that the proposal now meets the requirements of being safe from flooding for the lifetime of the development".

Figure 3. The generator before and after FRA Rev 2: raised from ground level to 24.13 mAOD, 300 mm above the design flood level.

The outcome. Rushcliffe Borough Council granted permission on 10 July 2026. Condition 4 requires the development to follow the revised FRA and states: "The generator shall be installed 24.13 metres above Ordnance Datum (AOD)". Raising the unit took it above the height the case officer had said was acceptable visually (about 2.1 m); the officer accepted 2.44 m, but it had to be checked separately. The Waterside case study gives the rest of the job.

The objection took about two months to clear, and the response that cleared it was a single level, taken from the Agency's own model, with the freeboard the SFRA asks for. Querying the classification did not change what the Agency needed.

Worked example 2: decking, voids and level-for-level compensation (26/01935/FUL)

Application 26/01935/FUL, on Ferry Lane, Alveston, near Stratford-upon-Avon, is for a self-build dwelling on the foundations of a demolished house and the alteration of a Boat House annexe, on the south-west bank of the River Avon in Flood Zone 3. The applicants' Flood Risk Assessment was prepared by another consultant. AFC was appointed on 26 October 2026 to prepare an addendum on floodplain storage, in response to the Environment Agency's objection.

Two letters. EA West Midlands objected on 9 September 2026 (PA-0010759/01) on floor levels and lost floodplain storage, and asked for storage to be tabulated in height bands of 200 to 250 mm with plans and sections. Its second letter, of 23 October 2026 (PA-0010759/02), accepted the design flood level of 38.73 mAOD (1 in 100-year plus 20% climate change, "considered to be an appropriate allowance") and floor levels of 39.33 mAOD, 600 mm above it, "as set out within our West Midlands area guidance". It maintained the objection on storage. The submitted site plan showed about 144 m² of raised decking, planters, steps and landings around the two buildings, and the letter found that the decking "does not appear to be a traditional open-fronted design but to be a solid and somewhat enclosed feature". It went on: "whilst the use of stilts and voids below buildings may be an appropriate approach to mitigating flood risk to the buildings themselves, such techniques should not normally be relied upon for compensating for any loss of floodplain storage." That is the position in paragraph 049 of the Planning Practice Guidance (Reference ID 7-049-20220825), and AFC's records show EA Thames taking the same line on voids and stilts on another job.

Why the decking had to go. Counting the submitted decking and planters as solid, AFC's first band check found 62.4 m³ lost below 38.73 mAOD, 32.8 m³ of it in the top band. Storage in the top band can only be replaced by lowering ground that is now above 38.50 mAOD, and the only large area of that ground was the drive and the parking area, the route out of the site. On 28 October 2026 the applicants revised the site plan: all decking and planters were removed and replaced by open-tread galvanised steel steps with a small platform at each door, five sets at the house and two at the Boat House, with four balcony posts. The new structures below the design flood level fell from about 144 m² to 31.8 m².

Figure 4. Three shallow lowered areas (A1, B and E) replace the storage lost below 38.73 mAOD; the new steps and platforms are hatched and counted solid (26/01935/FUL, AFC drawing 163-CS-301).

The calculation. The addendum (Issue 1, 30 October 2026) divides the depth between the lowest ground under a new structure (37.92 mAOD) and the design flood level into four bands and counts every step, platform and post as solid from ground to 38.73 mAOD, with no credit for the space beneath. The structures displace 0.46, 1.72, 6.05 and 7.31 m³ from the lowest band to the top, 15.54 m³ in total. Lowering about 89 m² of higher ground (raised planters and paving in the south garden, the turning area south-east of the house and a shallow grip on the river side) creates 0.81, 3.46, 7.88 and 10.72 m³, 22.87 m³ in total. About 26.4 m³ is to be excavated and taken off the floodplain, and the lowered ground drains back to the river through an outlet at 38.00 mAOD. The drive, the parking area and the walled garden are not lowered.

Level-for-level balance, storage lost and created by band (addendum Table 5):

• 37.90 to 38.10 mAOD: 0.46 m³ lost, 0.81 m³ created, net +0.35 m³

• 38.10 to 38.30 mAOD: 1.72 m³ lost, 3.46 m³ created, net +1.74 m³

• 38.30 to 38.50 mAOD: 6.05 m³ lost, 7.88 m³ created, net +1.83 m³

• 38.50 to 38.73 mAOD: 7.31 m³ lost, 10.72 m³ created, net +3.40 m³

• Total: 15.54 m³ lost, 22.87 m³ created, net +7.32 m³

Figure 5. Loss and gain in each band: every band is in surplus, the tightest 38.30 to 38.50 mAOD at +1.83 m³ (AFC drawing 163-CS-302).

Figure 6. Section B–B′: the open steps and platform are counted as solid up to 38.73 mAOD (hatched); the turning area to the right is lowered to create storage.

Where it stands. The addendum was prepared for the applicants to send to the case officer with a request to re-consult the Agency. At the time of writing the application is undecided and the Agency has not responded to it. The design change did more than the calculation: once the footprint below the design flood level was a fifth of what it had been, the compensation fitted in the garden and the turning area without touching the access. Our Staines case study and the guide to flood compensation for extensions show the same method on other sites.

The traps

Arguing the classification instead of answering the risk. On 25/01976/FUL the query over whether a generator is essential infrastructure did not change the outcome: the generator still had to go up. If the Agency's reading of Annex F is defensible, design to it.

A design flood level the Agency does not recognise. AFC's records include an objection where the FRA took its level from a model node some distance from the site and applied the wrong climate change allowance. Use the node nearest the site in the Agency's current model, the allowance for the right management catchment and epoch, and say which you used.

Counting voids, stilts and open decking as storage. Paragraph 049 of the PPG and both EA letters above are clear. Count every new structure below the design flood level as solid over its full footprint, and reduce the footprint if the numbers do not work. Opening up the sides of a deck does not reduce the compensation.

Raising plant or floors without checking the height. Freeboard adds height. At West Bridgford a 540 mm raise took the generator past the case officer's informal visual limit; check the new height with the officer before the report goes in.

Removing the access the FRA relied on. At Alveston the original FRA cited the removed decking for safe access. When a redesign removes or lowers anything on the route out, restate the route, the depth along it and its hazard, using a flood hazard rating where the depth changes.

Answering some points and not others. Each partial answer costs another round of consultation.

What to send with your response

• The Agency's letter, with its reference on the cover of everything you send.

• The revised FRA or an addendum that states which parts of the earlier assessment it replaces.

• The Agency's data: Product 4, or the model the letter names, with the node or grid point used.

• Revised drawings: floor levels and plant levels in mAOD on sections, and a site plan showing every structure below the design flood level.

• For storage: the band table, a plan of the compensation areas and sections of existing and proposed ground, as the Agency asks.

• For access: the route out, the design flood depth along it and the hazard rating.

• A covering note to the case officer that maps each point in the letter to the page that answers it and asks for the Agency to be re-consulted.

• Where the use is in question, the Annex F classification and, if it applies, the Sequential and Exception Tests.

What happens if the Environment Agency objects to my planning application?

The objection goes on the planning file and the case officer has to take it into account. If it is still in place when the application is decided, the council is likely to refuse or to ask you to withdraw. Most objections name what would overcome them, so the usual course is a revised Flood Risk Assessment or an addendum that answers each point, followed by re-consultation.

Can the council approve a planning application if the Environment Agency objects?

It can, because the Agency is a consultee and the council makes the decision. In practice councils rarely approve against a standing objection on flood risk, and the safer course is to get the objection withdrawn before the decision.

How do I get an Environment Agency objection withdrawn?

List every point in the letter, get the Agency's own flood data for the site, answer each point in the form the letter asks for (a level on a drawing, a band table, a route plan), change the design where the numbers require it, and send it to the case officer citing the Agency's reference with a request to re-consult. On 25/01976/FUL the objection was withdrawn after one revised FRA.

What is a holding objection from the Environment Agency?

It is an objection made because the Agency does not have enough information to comment, usually because there is no site-specific Flood Risk Assessment or the one submitted does not address the risk. It is answered with a complete assessment rather than replies to individual points.

Does the Environment Agency accept stilts, voids or decking as flood storage?

Normally not. Paragraph 049 of the Planning Practice Guidance and the Agency's letters say stilts and voids should not normally be relied on to compensate for lost floodplain storage, although they can protect the building itself. Count decking, steps and platforms as solid over their footprint and provide level-for-level compensation.

Do I need a new flood risk assessment or just an addendum?

If the objection is about one matter, such as storage or a plant level, an addendum that answers it and states which parts of the original it replaces is usually enough; that was the approach at Alveston. If the Agency calls the assessment inadequate in general, or the site, the use or the flood data has changed, a revised assessment is clearer for the officer and the Agency.

What is EA Product 4 data and how do I get it?

Product 4 is the Environment Agency's detailed flood risk data package for a site: modelled flood levels and extents for a range of events, including climate change, with defence information. Request it through the Flood map for planning service; the Agency's guidance says the local team will send it within 20 working days.

How long does the Environment Agency take to respond to a revised flood risk assessment?

It varies by area and by how complete the response is. On 25/01976/FUL the Agency replied by email the day after the revised FRA was issued and sent its formal withdrawal about five weeks later. Ask the case officer to re-consult as soon as the revised documents are on file.

Get the objection answered

An Environment Agency objection is a list of what the Agency needs before it can support the application. Answer every point with the Agency's own data, put the numbers on drawings, and change the design where the numbers say it must change. If you have an objection letter, send it with the Flood Risk Assessment and the drawings through our quote form for a fixed fee proposal for the response.