Flood Risk Assessments Under the NPPF 2026: What's Changed and How to Prepare
If you are preparing an NPPF 2026 flood risk assessment, the document you are writing to has changed shape. The August 2026 National Planning Policy Framework, subtitled "Plan-making and national decision-making policies", runs to 130 pages and opens by confirming at paragraph 1 that it "replaces the previous National Planning Policy Framework published in December 2024". Flood risk has been lifted out of the old combined climate chapter and given a chapter of its own, and one of the decision-making policies has been rewritten in a way that changes who has to prove what. Below is what actually moved, and what it means for applications going in now.
Flood risk gets its own chapter: policies F1 to F9
Under December 2024, flood risk sat inside Chapter 14, "Meeting the challenge of climate change, flooding and coastal change", sharing a chapter with energy and coastal policy. In August 2026 it stands alone as Chapter 18, "Managing flood risk and coastal change", at printed pages 83 to 87, with nine coded policies:
F1 Assessing flood risk for plan-making
F2 Planning for effective flood risk management
F3 Managing coastal change
F4 Assessing flood risk for decision-making
F5 The sequential test
F6 Development in areas at risk of flooding from rivers or the sea
F7 Ensuring development is safe from flooding
F8 Sustainable drainage systems and watercourses
F9 Development in Coastal Change Management Areas
The split between plan-making and decision-making is not cosmetic. Paragraph 8 confirms that the thematic chapters contain both, and that "the plan-making policies should not be used when making decisions on development proposals." F1 to F3 are addressed to plan-makers. F4 to F9 decide your application. Paragraph 10 adds that the boxed objectives at the start of each chapter are "for context only and should not be applied as either plan-making or decision-making policy", so the framing text at the head of Chapter 18 is not something you argue compliance against.
The practical consequence is that citation now has to be precise. "Paragraph 173" means nothing in August 2026. "Policy F7(2)(e)" does.
Annex F: the tables that used to sit in guidance are now national policy
This is the change most likely to be missed. Paragraph 9 states: "The annexes included with this Framework are also national planning policy."
Annex F, "Managing flood risk and coastal change" at printed pages 124 to 128, now carries three tables:
Table 1 — the flood zone definitions
Table 2 — the flood risk vulnerability classification
Table 3 — the vulnerability and flood zone incompatibility matrix
Under December 2024, only the vulnerability classification was inside the Framework, at Annex 3. There was no flood zone definition table and no incompatibility matrix in the NPPF at all; both lived in Planning Practice Guidance. Guidance is a material consideration. Policy carries more weight. Table 3 has been promoted.
Table 1 defines Flood Zone 1 as land with less than a 0.1% annual probability of river or sea flooding; Zone 2 as between 1% and 0.1% from rivers, or between 0.5% and 0.1% from the sea; and Zone 3a as 1% or greater from rivers — the 1 in 100-year (1% AEP) event — or 0.5% or greater from the sea. Zone 3b, the functional floodplain, is "land where water from rivers or the sea has to flow or be stored in times of flood", normally land with a 3.3% or greater annual probability, or land designed to flood. The note to Table 1 repeats the point that trips up so many desk studies: Zones 2 and 3 "only account for river and sea flooding, and do not account for the benefits of flood defences or the possible effects of climate change."
Table 3 itself sets the outcomes. In Zone 2, highly vulnerable development needs the exception test and everything else is acceptable in principle. In Zone 3a, highly vulnerable development should be refused, more vulnerable development and essential infrastructure need the exception test, and less vulnerable and water-compatible uses are acceptable. In Zone 3b, everything except water-compatible uses and exception-tested essential infrastructure should be refused. There is a note worth reading twice: where a development contains different elements of vulnerability, "the highest vulnerability category should be used, unless the development is considered in its component parts." If you want the components assessed separately, say so explicitly and justify it. If you say nothing, the most vulnerable element sets the category for the whole scheme. Our page on flood zones 1, 2 and 3 sets out how the zones are read on the ground.
Policy F4: what now triggers a site-specific flood risk assessment
F4(1) is familiar: an FRA "should accompany all development proposals in Flood Zones 2, 3a, and 3b as defined in Annex F, table 1."
F4(2) is the part to check carefully. In Flood Zone 1, an FRA should inform and accompany all proposals involving:
(a) "Sites of one hectare or more";
(b) "Land which has been identified by the Environment Agency as having critical drainage problems"; and
(c) "Land identified in a strategic flood risk assessment or the Flood Map for Planning as being at risk of flooding from any source, whether now or in the future."
Limb (c) is wider than its predecessor. December 2024 footnote 63 caught land at increased future risk, and other sources of flooding only "where its development would introduce a more vulnerable use". F4(2)(c) drops that qualifier, adds the Flood Map for Planning as a trigger in its own right, and applies to any source, now or in the future. A modest Zone 1 site with a surface water flow path across the rear garden, or a groundwater emergence area flagged in the borough SFRA, is caught whether or not the use is changing. In our experience this is where validation queries are now landing most often: the applicant checks the flood zone, sees Zone 1, and stops.
F4(3) requires assessments to be "appropriate to the scale, nature, and location of development", and to support the sequential and exception tests at F5 and F6 where relevant. Proportionality cuts both ways. A single-storey rear extension does not need a hydraulic model, but it does need the right evidence for the risk that is actually present.
Policy F7: "should be refused unless" — the burden of proof has flipped
F7 is the most consequential rewrite in the chapter.
December 2024 paragraph 181 was framed permissively: "Development should only be allowed in areas at risk of flooding where, in the light of this assessment (and the sequential and exception tests, as applicable) it can be demonstrated that: a) within the site, the most vulnerable development is located in areas of lowest flood risk...; b) the development is appropriately flood resistant and resilient...; c) it incorporates sustainable drainage systems, unless there is clear evidence that this would be inappropriate".
F7(2) is framed as a refusal. Where development is proposed in a location known to be at risk from any form of flooding, now or in the future, "it should be refused unless" all five limbs are met: (a) the most vulnerable development is in the areas of lowest flood risk within the site, absent overriding reasons; (b) the development will be safe throughout its lifetime taking account of the vulnerability of its users; (c) residual risk can be safely managed with safe access and escape routes where appropriate, "as part of an agreed emergency plan"; (d) the development is appropriately flood resistant and resilient "such that, in the event of a flood, it could be quickly brought back into use without significant refurbishment"; and (e) "it can be demonstrated that flood risk will not be increased elsewhere."
Read the two side by side and the starting position has moved. Under paragraph 181 the officer had to reach a positive conclusion to permit. Under F7(2) the default is refusal and the applicant's evidence has to displace it. Silence in an FRA is no longer neutral.
The agreed emergency plan at F7(2)(c)
"Agreed" is doing real work. A generic evacuation paragraph appended to an FRA is not an agreed plan. It means a route, a trigger, a responsible person and a document the local authority's emergency planning team and, where they are consulted, the Environment Agency, have seen and accepted. Where safe access and egress is contested, that agreement takes time to obtain. Our flood evacuation plan service covers what that document needs to contain.
Resistance and resilience at F7(2)(d)
The recovery wording is new in this form. Demonstrating compliance means specifying products and finishes — flood doors and barriers, non-return valves, closed-cell insulation, raised sockets, floor build-ups — against the design flood level, and showing that the property could be dried and reoccupied without significant refurbishment. Design lifetimes come from Planning Practice Guidance: 100 years for residential and 75 years for non-residential development.
December 2024 and August 2026, side by side
Point | December 2024 | August 2026 |
Location of flood policy | Chapter 14, combined with climate change | Chapter 18, standalone, policies F1–F9 |
Flood zone definitions | Planning Practice Guidance only | Annex F, Table 1 — national policy per paragraph 9 |
Vulnerability / zone matrix | Planning Practice Guidance only | Annex F, Table 3 — national policy |
Vulnerability classification | Annex 3 | Annex F, Table 2 |
Safety of development | Para 181, "should only be allowed... where it can be demonstrated" | F7(2), "should be refused unless" |
Emergency planning | Not expressed as an agreed plan | F7(2)(c), "as part of an agreed emergency plan" |
Exception test limbs | Two (para 178) | Three (F6(1)(b)(i)–(iii)), with safety tied to F7 |
Sequential test search area | No stated geographical limit (para 174) | Capped at the anticipated catchment (F5(1)) |
Information requirements | No national list | Annex C lists the FRA and the SuDS statement |
The householder extension trap: exempt from the sequential test, not from F7
This is the pattern we are seeing most often in current casework, and it is worth setting out the mechanism properly because it is routinely explained wrongly.
Householder development is exempt from the sequential test under F5(2)(c)(i). Small non-residential extensions with a footprint of less than 250 m² are exempt under F5(2)(c)(ii), and most changes of use under F5(2)(c)(iii). Because F6(2)(a) disapplies the exception test wherever the sequential test is not required, those same proposals also escape the exception test.
None of that touches F7. F7 contains no equivalent exemption. A rear extension in Flood Zone 3a is therefore refused unless all five limbs of F7(2) are satisfied, including F7(2)(e) — that flood risk will not be increased elsewhere.
An extension built within the floodplain occupies volume that flood water previously occupied. That water goes somewhere else. That is a loss of flood storage, and it is exactly what F7(2)(e) asks about. Planning Practice Guidance states that where flood storage from any source is to be lost as a result of development, on-site level-for-level compensatory storage, accounting for the predicted impacts of climate change over the lifetime of the development, should be provided. Annex F, Table 3 uses the same concept in its note on Zone 3b, requiring essential infrastructure that has passed the exception test and water-compatible development to "result in no net loss of floodplain storage" — that note is specific to Zone 3b, but it shows the direction of the policy.
So the reassurance people rely on — "it's only a householder extension, we don't need the sequential test" — is correct and beside the point. The sequential test was never the obstacle. F7 is. We are already seeing councils refuse small extensions in Flood Zones 2 and 3, and in areas of high surface water risk, where no compensatory storage is offered and no calculation of displaced volume appears anywhere in the submission. A Planning Inspectorate appeal decision has attached significant weight both to the Environment Agency's objection as statutory consultee and to the cumulative impact of many similar small developments in Flood Zone 3 each being permitted without compensation. Our view, offered as professional opinion rather than policy, is that the refusal framing of F7(2) will make that reasoning easier for decision-makers to adopt, not harder.
The practical answer is usually arithmetic rather than argument: establish the design flood level including the appropriate climate change allowance, calculate the volume of floodplain displaced by the extension in m³, and show where an equivalent volume is created on site, level for level. Where level-for-level is topographically impossible, that has to be demonstrated rather than asserted, and an alternative such as a floodable void or volume-for-volume compensation put forward with its limitations stated. See our flood risk assessment page for how we handle this.
Annex C: the FRA and the SuDS statement are now national information requirements
Annex C, "Information requirements" at printed pages 116 to 117, sets out a national list. Two entries matter here:
Against policy F4: "Site-specific flood risk assessment appropriate to the scale, nature and location of development."
Against policy F8: "Statement outlining how the national SuDS standards have been achieved for development proposals which could affect drainage on or around the development site."
The second entry is the one to watch. F8(1) requires proposals which could affect drainage on or around the site to incorporate sustainable drainage systems to control flow rates and reduce runoff volumes, proportionate to the nature and scale of the proposal, and F8(2)(a) requires design "in accordance with the National Standards for Sustainable Drainage Systems". Those standards were published by Defra on 19 June 2025 and updated on 30 July 2025, replacing the 2015 non-statutory technical standards. They remain non-statutory, and Schedule 3 of the Flood and Water Management Act 2010 is still uncommenced in England — but Annex C now names a statement demonstrating compliance with them as a national information requirement. Expect validation checklists to catch up. Our SuDS page covers what that statement needs to show.
F8(2) also requires maintenance arrangements for the anticipated lifetime of the development and, for major development, that Lead Local Flood Authority advice is taken into account. F8(3) discourages enclosing existing watercourses without compelling reasons and encourages removing culverts and renaturalising channels where possible.
How to be ready: a checklist for your next application
Re-cite everything. Replace December 2024 paragraph references throughout your templates with F1 to F9, Annex F and Annex C references. Cite to sub-limb level — F5(2)(c)(ii), F7(2)(e), Annex F Table 3.
Screen Flood Zone 1 sites against F4(2)(c), not just the flood zone. Check the SFRA and the Flood Map for Planning for every source, present and future.
Fix the vulnerability classification early using Annex F, Table 2, and decide whether you are arguing the scheme as a whole or in component parts. Say which.
Answer all five limbs of F7(2) explicitly, with headings. Do not leave a limb to be inferred. If a limb is not engaged, say why.
Quantify displaced flood storage in m³ for any built form within the floodplain, however small, and set out the compensation, including climate change over the 100-year or 75-year design life.
Get the emergency plan agreed, not just written. Start that conversation with the LPA and the Environment Agency before submission, because F7(2)(c) asks for agreement.
Specify resistance and resilience measures by product and level, tied to the design flood level, with a short statement on recovery.
Produce the Annex C SuDS statement against the Defra national standards, with maintenance arrangements, wherever drainage on or around the site could be affected.
Use current Environment Agency climate change allowances — peak river flow by management catchment and river basin district, peak rainfall intensity for surface water and small urban catchments, for the 2050s and 2070s epochs — and state which you have applied and why.
Where the sequential or exception test is in play, read our note on the sequential and exception tests alongside this one.
Frequently asked questions
Does the August 2026 NPPF apply to applications already submitted?
The Framework states at paragraph 1 that it replaces the December 2024 version, and decisions are made against the policy in force at the time of the decision. In practice, applications that were validated before August 2026 but are determined afterwards will be assessed against F1 to F9. If your submission was written to the old paragraph numbering and is still undetermined, a short addendum addressing F7(2) limb by limb is usually a sensible step.
Is a flood risk assessment needed for a Flood Zone 1 site?
Sometimes. F4(2) requires one where the site is one hectare or more, where the Environment Agency has identified critical drainage problems, or where the SFRA or the Flood Map for Planning identifies risk of flooding from any source now or in the future. A small Zone 1 site with a mapped surface water flow path falls within F4(2)(c).
Do I need compensatory storage for a rear extension?
If the extension sits in the floodplain and displaces flood water, you need to address F7(2)(e) and show that flood risk will not be increased elsewhere. Planning Practice Guidance expects on-site level-for-level compensation where flood storage is lost. The exemption from the sequential test at F5(2)(c)(i) does not remove that requirement.
What is an "agreed emergency plan" under F7(2)(c)?
A flood warning and evacuation plan that the local authority, and where relevant the Environment Agency, has seen and accepted — with defined triggers, a safe route, a refuge or destination and named responsibilities. It is not a paragraph inside the FRA. Allow time for the agreement itself.
If you have a site in Flood Zone 2 or 3, a Zone 1 site caught by F4(2)(c), or a householder extension where the council has asked about compensatory storage, we can tell you quickly what the August 2026 policies require and what the evidence will cost. Get a quote and send us the address and the drawings.
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