The August 2026 NPPF: What Changed for Heritage?

The NPPF sets out the government's planning policies for England and how they should be applied. It is revised periodically, and the version published in August 2026 made the most significant changes to heritage policy in some years. Its decision-making policies took effect from 17 August 2026.

Where does heritage policy sit now?

Historic environment policy now sits in Chapter 20, as policies referenced HE1 to HE10 rather than the numbered paragraphs used in earlier versions. [GPS TO VERIFY: confirm the exact scope and title of each individual HE policy against the published August 2026 NPPF text before this guide goes live — available secondary sources gave inconsistent breakdowns of which policy number covers which topic, so this guide deliberately does not assert a full policy-by-policy list.]

Has "less than substantial harm" really gone?

For years, heritage practitioners worked with a two-tier test: whether a proposal caused "substantial harm" or "less than substantial harm" to a designated heritage asset's significance, with different weight given to each. The August 2026 Framework drops that specific phrase. Effects on a heritage asset are instead described on a broader scale running from a positive effect, through no effect, to harm, and — in the most serious cases — total loss of significance. Any harm identified still has to be weighed against the public benefits of a proposal; what has changed is the vocabulary used to describe and categorise that harm, not the basic principle that harm must be justified.

Does retrofit now count as a public benefit?

Yes, in part. Current heritage policy now names securing the long-term reuse of a vacant or underused listed building, and enabling energy efficiency and low-carbon heating measures, as public benefits in their own right — factors that can be weighed on the benefit side of the balance against any harm a proposal causes. This does not make consent automatic for retrofit works; the balance still has to be struck case by case, and the work still has to be designed to minimise harm to historic fabric. See our retrofit guide for what this means in practice.

What should I do if my documents were written before August 2026?

If your Statement of Heritage Significance, Heritage Impact Assessment or Design and Access Statement was written before August 2026, check that any references to "less than substantial harm" or paragraph-numbered heritage policy (rather than the HE-numbered policies) have been updated before the document is relied on in a live application — an outdated policy reference can prompt a case officer to ask for revisions, adding delay.

Does the change apply outside England?

No. The NPPF is a document for England only. Scotland, Wales and Northern Ireland each have their own separate planning policy frameworks and their own heritage designation systems, and none of them are affected by this change. If your building is outside England, the August 2026 NPPF and everything in this guide is not the policy that governs your application — check the equivalent national planning policy for your jurisdiction instead.

Where can I read the policy itself, rather than a summary?

The full National Planning Policy Framework is published on GOV.UK and is free to read in full. For applications that turn on a fine point of policy wording, there is no substitute for reading the actual clause rather than relying on a summary, this guide included — a qualified heritage or planning professional can help you find and interpret the specific policy that applies to your case.

Does this affect conservation areas as well as listed buildings?

Chapter 20 covers the historic environment as a whole, which includes conservation areas, registered parks and gardens, scheduled monuments and World Heritage Sites, not just individually listed buildings. A conservation area is a distinct designation — an area, rather than a single building, valued for its overall character — with its own consent regime for demolition and its own considerations around the character or appearance an authority is expected to preserve or enhance. The same shift away from "less than substantial harm" as fixed terminology applies across all of these designations, not just to listed buildings specifically.