Redetermination after a quashed appeal decision

A quashed appeal decision is not a win. It is a decision that has been removed, leaving the appeal undetermined and heading back for a fresh decision by a different inspector, on the policy in force at the date of that new decision rather than the old one. Appeal redetermination after quashing is therefore a second run at the same appeal in changed circumstances, and clients who have been told they won in court frequently need that explained twice.

The mechanics are reasonably predictable once you know what to expect, and the policy risk is the part worth planning for.

What happens when a decision is quashed

An appeal decision is challenged by an application to the High Court under section 288 of the Town and Country Planning Act 1990, made within six weeks of the decision and requiring the court's permission to proceed. Enforcement appeal decisions follow a separate route.

The court's role is to review the legality of the decision rather than its planning merits. So the grounds are errors of law: failing to take a material consideration into account, misinterpreting policy, failing to give adequate reasons, procedural unfairness, and similar. An inspector who reached a conclusion you disagree with, lawfully, has made an unappealable decision.

Where the challenge succeeds, the usual remedy is that the decision is quashed and the appeal is remitted for redetermination. Nothing is decided by the quashing itself. The planning permission you wanted does not exist, and the refusal you appealed does not revive either, because the appeal is simply outstanding again.

Many challenges never reach a hearing. Where the Secretary of State accepts that the decision contains an error, the parties frequently agree a consent order quashing it, which saves time and cost and gets to the same remittal. Treat a concession as a good outcome rather than an anticlimax.

Remittal and the appointment of a new inspector

After remittal the Planning Inspectorate takes the appeal back into its system and normally appoints a different inspector. That is a matter of practice rather than statute, and it exists to avoid any appearance of predetermination.

The Inspectorate will write to the parties setting out how it proposes to proceed. That letter matters more than anything else in the process, because it defines the scope of the redetermination and the timetable for representations. Read it carefully and respond within the period given, because a party who does not engage at that point has limited scope to complain later.

The procedure may change. An appeal originally dealt with by written representations can be redetermined by hearing or inquiry if the issues now warrant it, and vice versa. Where the judgment identified a fairness problem, expect a procedure that cures it.

Site visits are usually repeated, since the new inspector has not seen the site.

Scope of the redetermination

In principle the whole appeal is redetermined. In practice the Inspectorate will usually propose to confine further representations to the matters affected by the judgment, and the parties are invited to comment on that proposal.

Three positions are worth thinking through before responding:

1. Where the judgment was narrow and your case is otherwise strong, a narrow scope is in your interest, because it limits the opportunity to reopen matters you won.
2. Where circumstances have changed in your favour, a wider scope lets you rely on them.
3. Where circumstances have changed against you, a narrow scope does not protect you, because the new inspector must apply current policy regardless of what the parties would prefer.

That third point is the one that surprises people. The scope of representations can be limited. The legal duty to determine the appeal in accordance with the development plan in force, unless material considerations indicate otherwise, cannot be.

Policy changes between decisions

Between the original decision and the redetermination, anything may have happened. This is the substantive risk in the process.

The National Planning Policy Framework has been revised repeatedly, and the current edition was published on 17 August 2026 with policy-coded chapters in place of the paragraph numbering used in earlier editions. A case argued on an earlier edition needs re-pleading against the current one, and quoting a paragraph number from a superseded version is a straightforward way to lose credibility with the new inspector.

The local position may also have moved. A local plan may have been adopted or reached an advanced stage. A neighbourhood plan may have been made. The authority's housing land supply position may have changed, which can alter the balance the inspector applies. A relevant appeal decision or judgment may have been issued.

Statutory requirements move too. Mandatory biodiversity net gain now applies to most development, and a scheme appealed before that regime applied may need a position on it. Building and energy standards change. Where the original appeal predated a change, address it rather than waiting to be asked.

Build a policy audit into the first week after remittal: every policy cited in the original statements, checked against what is now in force, with the changes listed. It takes a day and it shapes everything else.

Further evidence and updated assessments

Whether new evidence is admitted depends on the scope the Inspectorate sets, and on relevance.

Evidence that is usually accepted includes updated policy analysis, an updated housing land supply position, updated technical assessments where standards or baselines have changed, and evidence about changes on the ground near the site. Evidence that is usually resisted includes a materially different scheme, which is a fresh application rather than a redetermination, and re-argued technical points that the first inspector resolved lawfully.

Check whether your technical evidence has aged out. Ecological survey data has a shelf life, and survey work carried out three seasons ago may need refreshing. Noise and air quality baselines may have moved. Traffic counts taken during an atypical period will be attacked. The Planning Statement and every supporting document should be reissued with a current date and a note of what changed, rather than resubmitted unchanged with an old date on the cover.

Where objectors were active first time round, expect them to be active again and to have found the judgment. Our note on what objectors can do once a planning appeal starts sets out their procedural position, which is the same on a redetermination.

Timescales to expect

Be honest with clients about the arithmetic, because the total is longer than anyone expects.

The six week period to lodge the claim, the permission stage, the substantive hearing if there is one, the judgment, the remittal, the Inspectorate's scoping letter, the representation periods, a fresh site visit and then the new decision. Each step is measured in weeks and several are measured in months. A cycle from the original decision to a redetermined decision commonly runs well beyond a year, and a consent order shortens the middle of that sequence rather than the whole of it.

Two consequences follow for programme. Any option agreement, funding facility or overage arrangement geared to a planning outcome needs enough time on it, and extending those agreements is easier done early. And where the site has a fallback position, such as an extant permission for a smaller scheme, the value of that fallback rises as the timescale extends.

Managing client expectations

Say three things clearly, in writing, at the outset.

Winning in court removes a decision and does not grant a permission. The redetermination is decided on today's policy, which may be better or worse than the policy that applied first time. And the new inspector may reach the same conclusion as the first one, lawfully, in which case the position is a second dismissal after a year of cost.

Set out the alternatives alongside the redetermination, because they are sometimes better. A revised application addressing the original reasons for refusal can be quicker than a remitted appeal, and our note on withdrawing an application before refusal covers the related judgement about when not to collect a decision at all. Where the refusal reasons were narrow, going back to the authority with an amended scheme may be the faster route even after a successful challenge, and our note on reading a refusal notice and turning it into a plan is the starting point for that analysis.

This is general guidance about planning procedure and not legal advice. Statutory challenges involve strict deadlines and litigation risk, so take advice from a solicitor or counsel before deciding whether to challenge a decision or how to handle a redetermination.

PlanScope can draft and reissue the supporting statements a redetermination needs, structured to UK planning policy, with clear markers where facts need updating. For specialist technical reports, qualified professional input may be required.

PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.