The planning appeal procedure is changing. Are you ready?

For years, a planning case could be bolstered or expanded during the appeal process with a "Statement of Case." Adding new arguments, policy comments, or evidence after a refusal was possible — but after 1 April 2026, this approach will no longer be available. This and other updates by the Government will create ripples in how planners, architects, and their clients approach the development of a site. Local Authority officers will also be affected by rules designed to streamline the system.

What do you need to know?

Under the new guidance, the vast majority of planning appeals will follow the new Part 1 Written Representations procedure. In this format, there is no opportunity to submit a separate Statement of Case after a refusal of a planning application. The Inspector will decide the majority of appeals based entirely on the documentation that was in front of the Local Planning Authority (LPA) when they made their original decision.

Why this matters

If your initial planning statement, submission material, or decision report does not contain all relevant arguments or evidence, it will not be possible to add them after a decision is made by the LPA. In most cases the Inspector will look at the original planning application material, the decision notice, and the officer's report only. If the logic isn't there from the start, the appeal is likely to fail.

This change in procedure has a huge impact on the quality of policy interpretation and research needed during the planning process. Identifying planning risk and any mitigation strategies will be even more important. Pre-planning engagement with Local Authorities will also likely be promoted to ensure clear reasoning and approaches.

How to adapt

• Audit before you submit: Use planningappeals.co.uk to find similar cases in your LPA. Within those cases we can highlight key interpretations of policy that you can verify directly from the original Inspector's Report.
• Mirror successful reasoning: We have surfaced 2.4 million Inspector arguments — and show you where they are within the original appeal document. planningappeals.co.uk approaches searches with transparency, traceability, and verification so you can have confidence in your results.
• Check your sources: Our gateway directs you to appeal cases and helps to surface important policy interpretations that were relevant in the decision-making process. The Planning Inspectorate has also provided guidance on AI and technology which can impact your appeal. We will be posting about this soon.

---

Section 9.2 of the new Planning Inspectorate guidance (12 February 2026) gives a full procedural breakdown: https://www.gov.uk/guidance/planning-appeals-procedural-guide-for-appeals-relating-to-applications-dated-on-or-after-1-april-2026#introduction