Planning for Flood Risk: The NPPF Explained

The NPPF is the National Planning Policy Framework: the government's planning policy for England, which councils apply when they decide planning applications and prepare local plans. The current Framework was published on 17 August 2026 and replaces every edition issued between 2012 and 2024. It runs to 130 pages across twenty chapters and six annexes, and it absorbed the separate Planning Policy for Traveller Sites along the way. This guide explains what the NPPF is, which version applies, how it is structured, and where flood risk sits inside it.

The August 2026 Framework replaced the paragraph numbers planners had cited for fourteen years with coded policies. A report citing paragraph 173 is now pointing at a document that carries no weight.

What is the NPPF, and what does it do?

The NPPF sets out what local planning authorities in England should approve, refuse and ask for. It is the national planning framework in the plainest sense: local plans, neighbourhood plans and individual decisions are all written to sit underneath it. It does two jobs at once: it tells councils how to write a local plan, and it tells them how to decide the applications that come in against that plan. The Framework describes itself in its opening paragraph.

That second sentence is the one that matters in practice. "Material consideration of critical importance" is stronger language than the 2012 Framework used, and it reflects what the August 2026 rewrite set out to do: replace a system where a lot turned on the decision-maker's judgement with one where the policy tests are closer to rules. Writing while the changes were still at consultation, the House of Commons Library described them as the most significant reform to national planning policy since the original NPPF was introduced, and the published version kept that shape.

The NPPF applies in England only. It has no effect in Wales, Scotland or Northern Ireland, each of which runs its own planning policy.

Where does flood risk sit in the NPPF?

Flood risk has its own chapter. Chapter 18, "Managing flood risk and coastal change", holds nine policies numbered F1 to F9, with the flood zone definitions and the vulnerability classification in Annex F. Before August 2026 the same policy sat inside a wider climate change chapter as a run of paragraphs; giving it a chapter of its own was a deliberate signal that flood risk is a primary constraint on where development goes. Nothing in Chapter 18 says you cannot build on a flood plain. What it does is make the case for doing so a great deal harder to argue, and put the burden of proof on the applicant.

The chapter states its purpose at the top.

In sequence, that means steering development to the safest available land, applying the sequential test where it still falls in an area at risk, applying the exception test for river or sea flooding, making whatever is permitted safe for its lifetime, and draining it to the sustainable drainage standards. If you need that applied to a specific site, our NPPF flood risk assessment guidance sets out which report each situation calls for.

The Environment Agency's national assessment puts around 6.3 million properties in England in areas at risk of flooding, of which about 4.6 million are at risk from surface water. That could reach around 8 million, or one in four properties, by the middle of the century.

Those figures come from the Environment Agency's national flood risk assessment, the dataset that now sits behind the Flood Map for Planning. Surface water is the reason the numbers moved: it is the most widespread source in England, and the one an applicant is least likely to have checked before choosing a site.

Is the NPPF law?

No. The NPPF is government policy, not a statute, and nothing in it can be enforced in its own right. Its weight comes from planning law: a planning application must be decided in accordance with the development plan unless material considerations indicate otherwise, and the Framework is a material consideration. The relevant statutes are the Town and Country Planning Act 1990 and the Planning and Compulsory Purchase Act 2004.

The statutory wording sits in section 38(6) of the Planning and Compulsory Purchase Act 2004, which requires that a determination "must be made in accordance with the plan unless material considerations indicate otherwise". The Framework's own paragraph 3 says the same thing from the other side: planning law requires applications to be determined in accordance with the development plan, and the Framework's decision-making policies are a material consideration in making those decisions.

The practical effect is that a scheme conflicting with the Framework is not unlawful, but it is very likely to be refused, and an appeal against that refusal is very likely to fail. Since the August 2026 rewrite the flood policies are worded as reasons to refuse rather than conditions on which permission may be granted, which narrows the room a decision-maker has to weigh flood risk against other benefits.

Which version of the NPPF is in force?

The Framework published on 17 August 2026 is the one in force. It replaced the December 2024 revision in full, and it applies to every decision taken from that date, including applications submitted while the previous version was current. There is no transitional period for decision-making.

Five versions matter to anyone reading older reports or appeal decisions.

Local plans are on a separate clock. Under the new arrangements a plan should be adopted within thirty months of the authority publishing its Gateway 1 self-assessment, reviewed no later than five years after adoption, and written to a horizon of at least ten years. So an application decided under the 2026 Framework may still be assessed against a local plan prepared under an older one.

What is in the NPPF? The 2026 chapter map

The Framework has twenty chapters and six annexes. Every chapter now carries lettered policy codes rather than a continuous run of paragraph numbers, so a policy is cited by its code and stays stable even when the surrounding text is revised.

The six annexes are A (implementation), B (glossary), C (information requirements), D (housing calculations and supply), E (Green Belt assessments) and F (managing flood risk and coastal change). Annex C is the one that catches people out on flood risk: it lists the site-specific flood risk assessment among the documents a council needs before it can determine an application, which makes a missing assessment a validation problem rather than a matter for negotiation later.

How do you cite the NPPF now the paragraph numbers have gone?

Cite the policy code, not the paragraph. Every NPPF policy now carries one, and the code is what a case officer will look for. The flood risk paragraphs of the old Chapter 14 were rewritten as policies in Chapter 18, and a report or a committee item still quoting the 2024 numbering is pointing at a document that has been withdrawn. The substance is usually unchanged; the reference is not.

1. Footnote 63, which set out when a flood risk assessment is required, became Policy F4.
2. Paragraphs 173 to 176, the sequential test, became Policy F5.
3. Paragraphs 177 to 180, the exception test, became Policy F6.
4. Paragraph 181, making development safe, became Policy F7, reworded as a reason to refuse.
5. Paragraph 182, drainage and sustainable drainage systems, became Policy F8.
6. Annex 3, the flood risk vulnerability classification, became Annex F, Table 2.

Any live application supported by a report written before August 2026 needs its policy references checked, because a council re-reading the case against the new Framework will be looking for the F codes. And where a piece of guidance still points at Annex 3 rather than Annex F, it is the guidance that is behind, not the Framework. Government guidance has been slow to catch up on exactly this point.

What the 2026 rewrite changed for flood risk

The tests themselves survived. What changed is where they live, how firmly they are worded, and how far they reach. On a live application, four changes do most of the work.

• A narrower sequential test. Policy F5 caps the area of search at the development's anticipated catchment, so a small local scheme is no longer asked to look across a whole borough for alternative sites.
• A surface water exemption. Where a site is at risk from surface water alone, the sequential test can fall away if the flood risk assessment demonstrates the scheme is safe for its lifetime without increasing risk elsewhere.
• A three-part exception test. Policy F6 now requires wider sustainability benefits, lifetime safety, and no increase in flood risk elsewhere, and it applies only to flooding from rivers and the sea.
• Mandatory drainage standards. Policy F8 requires design to the 2025 National Standards for sustainable drainage on all development rather than major schemes only, and discourages culverting.

Our clause-by-clause account of the August 2026 changes goes through each of these in full, and the drainage hierarchy and the climate change allowances that the safety test depends on each have a guide of their own.

What the NPPF does not cover

The Framework is national policy, and it stops well short of telling you how to do the technical work. That gap is filled by four other sources, and mistaking any of them for the NPPF is a reliable way to reach the wrong answer.

• Planning Practice Guidance. The PPG on flood risk and coastal change explains how to apply the policy, and the wider Planning Practice Guidance covers the rest of the system. It is guidance rather than policy, and parts of it lag behind the Framework after a rewrite.
• The development plan. Local policy sits above the Framework in the statutory hierarchy, and a local authority may set stricter drainage or flood standards than national policy requires.
• Statute. The Flood and Water Management Act 2010 created Lead Local Flood Authorities and their role in surface water, and is explained in full elsewhere on the site; the Land Drainage Act 1991 governs works to ordinary watercourses. Neither is planning policy.
• Wales. The NPPF has no application there. A Welsh site needs a flood consequence assessment under Technical Advice Note 15.

Meeting the NPPF, in other words, is necessary and not sufficient. A scheme can satisfy Chapter 18 and still be objected to by the Lead Local Flood Authority on a drainage point the Framework never mentions, or fall foul of a local plan policy that goes further than national policy does. In our experience that second one causes more delay than the Framework ever does, because it is the part applicants read last.

For most applicants the Framework is worth reading once, for orientation, and then treating as the map rather than the route. What decides an application is the evidence: the right report, addressing the right sources of flooding, citing the policies that are actually in force. If that is the stage you are at, Unda prepares flood risk assessments for planning across England, from desk study to signed report, and can handle the sequential and exception tests and your surface water drainage strategy alongside it. You can check your own site first on our flood risk map or against the Environment Agency's Flood Map for Planning.

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