When national policy changes during your appeal
An inspector applies the policy in force when the decision is issued, so a new NPPF edition or a newly adopted local plan can change an appeal after the statement of case is lodged. Here is the procedure and what to put in an addendum.
An inspector decides an appeal on the policy in force at the date of the decision, not the policy that applied when the council refused. So a policy change during appeal can reshape the case after the statement of case is in, and sometimes after the inquiry has closed. Section 38(6) of the Planning and Compulsory Purchase Act 2004 requires the determination to be made in accordance with the development plan unless material considerations indicate otherwise, and the plan in question is the one in force when the inspector signs the decision letter.
That principle is settled and rarely argued. What causes trouble is the procedure: how the Planning Inspectorate tells you about a change, how long you get to respond, and whether a short addendum helps or simply hands the council a second run at your weakest point.
Why the date of decision governs
The development plan is the starting point under section 38(6), and national policy sits alongside it as a material consideration. Neither is frozen at the point of refusal. When the National Planning Policy Framework was re-issued on 17 August 2026, restructured around policy codes such as GB6, DP2 and PM4 rather than the paragraph numbering used in the December 2024 edition, every live appeal that cited a paragraph number was suddenly citing something that no longer existed in that form.
The same applies to a local plan adopted mid-appeal, to a neighbourhood plan that passes referendum and is made, and to a written ministerial statement issued while the appeal is pending. Each becomes part of the decision-making framework on the day it takes effect.
Where a new Framework carries transitional arrangements, read them before assuming the new policy applies in full. Recent editions have used transitional provisions to protect plans at an advanced stage of preparation and to phase in particular policies, and those provisions can matter more to your appeal than the headline change does.
How the Inspectorate handles a change mid-appeal
In practice the case officer writes to the parties. On written representations you can expect a letter inviting comments within a short, fixed period, often a fortnight or less. At a hearing or inquiry the point is usually raised at the event itself, and the inspector will ask both sides how the change bears on the main issues.
Fairness is the governing principle rather than any fixed rule. The courts have consistently held that an inspector must not determine an appeal on a basis the parties had no fair opportunity to address. If a policy change is going to be central and nobody has been asked about it, say so in writing rather than assuming the inspector has noticed.
Do not wait to be invited. Where a change lands and no letter follows within a week or two, write to the case officer, identify the change precisely, and ask for the opportunity to make further representations. A short, specific request is normally granted. A vague one invites a refusal and looks like an attempt to delay.
Drafting an addendum that helps
Keep it short. Two to four pages is usually right, and the discipline of brevity forces you to say something useful.
- Identify the change with precision: the instrument or edition, its date, and the specific policy code, paragraph or provision that has moved.
- State whether it alters any of the main issues the inspector has already identified. If it does not, say so and stop.
- Where it does, set out the new policy test and apply it to the appeal scheme on the evidence already before the inspector.
- Flag any part of your original case that is now superseded, and withdraw it explicitly.
- Attach nothing new unless it is the policy document itself.
Point four is the one people avoid. Leaving a superseded argument on the table hoping nobody notices reads badly in a decision letter, and it costs credibility on the arguments that still stand. A Planning Statement drafted against the old numbering can usually be mapped across in a table rather than rewritten, which is far quicker and easier for the inspector to follow.
Resist the urge to reopen the whole case. An addendum that reargues the heritage balance under a new heading is an invitation for the council to do the same, and the inspector will notice.
Where a change helps you and where it does not
A policy change rarely affects both parties equally, and the honest assessment is worth doing before you ask for anything.
| Type of change | Usual effect on an appellant |
|---|---|
| National policy relaxing a restraint that formed a reason for refusal | Direct help, worth a focused addendum |
| A new local plan adopted with the site allocated | Strong help, often decisive on principle |
| A new local plan adopted with the site outside the settlement boundary | Damaging, and the council will raise it regardless |
| Change to a policy neither side relied on | Usually neutral, leave it alone |
| Restructuring without substantive change, as with a renumbering | Procedural only, deal with it in a mapping table |
Housing land supply is the common trap. A plan adopted mid-appeal resets the supply position and can remove the argument that the plan's most important policies are out of date. If your case rested on that, the adoption is not a detail to be handled in a footnote. The same dynamic plays out in Green Belt cases, where a change to national policy can alter what counts as inappropriate development before the very special circumstances balance is even reached.
When a local plan is adopted during the appeal
Adoption is the moment weight changes. Before adoption, an emerging plan carries weight according to its stage, the extent of unresolved objections and its consistency with national policy. On adoption it becomes the development plan and section 38(6) applies to it in full.
Watch the examination timetable from the day you lodge. Inspectors' reports are published before adoption, and the main modifications consultation gives you weeks of notice that a policy relevant to your site is about to bite. That notice is enough time to decide whether to press on or change course.
Withdrawing and starting again
Sometimes the right answer is to abandon the appeal. Consider it where the change has removed the foundation of your case entirely, where the scheme could be redesigned to meet the new policy, or where a fresh application would be determined faster than the appeal will conclude.
The arithmetic is specific to the case: the fee already sunk, the costs exposure if the council can show you pursued a hopeless appeal after the change, the time remaining on the original permission if there is one, and whether a resubmission qualifies for the fee exemption. The choice between resubmitting and pressing on is set out in more detail in our comparison of a free go resubmission and an appeal.
Costs deserve a word. An award can follow unreasonable behaviour, and continuing an appeal that a policy change has plainly killed is capable of being unreasonable. Equally, a council that refuses to reconsider its position after a change that clearly assists the appellant exposes itself in the same way. Neither side should assume the change only cuts one way.
Draft your addendum and supporting statements with PlanScope, then have them checked by your planning adviser before they go to the case officer.
PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.
Frequently asked questions
Which version of policy does an inspector apply?
The version in force at the date of the decision. Section 38(6) of the Planning and Compulsory Purchase Act 2004 requires determination in accordance with the development plan unless material considerations indicate otherwise, and national policy is assessed as it stands when the decision letter is issued. Policy that applied at refusal has no special status on appeal.
Will the Planning Inspectorate tell me if policy changes during my appeal?
Usually yes. The case officer writes to the parties inviting comments, typically within a short fixed period, or the inspector raises it at the hearing or inquiry. Do not rely on that alone. If a change lands and no letter follows within a week or two, write to the case officer identifying the change and requesting the chance to comment.
How long do I get to respond to a mid-appeal policy change?
There is no fixed statutory period for this situation. On written representations the Inspectorate commonly allows around a fortnight, sometimes less, and expects focused comments rather than a new case. If you need longer for a substantial change, ask immediately and explain why, rather than submitting late.
Does a local plan adopted during my appeal override my arguments?
It becomes the development plan from adoption, so its policies carry full statutory weight in the decision. That can remove an out-of-date-plan argument, reset the housing land supply position, or allocate your site and help you. Track the examination timetable from the day you lodge so the adoption date is never a surprise.
Can I be awarded costs if the council ignores a helpful policy change?
An award can follow unreasonable behaviour by either party. A council that refuses to review its position after a change plainly removing its reason for refusal risks an application against it. The same logic applies in reverse to an appellant pressing on after a change has destroyed the case, so assess the position honestly before continuing.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.