Linked appeals, conjoined inquiries and split sites
Conjoining appeals saves witness time and concentrates risk on shared issues. This covers when the Inspectorate links appeals, what evidence must stay separate, costs apportionment and cross-boundary schemes refused by two authorities.
Linked planning appeals are a procedural convenience with strategic consequences. The Planning Inspectorate will often hear two or more related appeals at a single event, with one inspector, one site visit and one set of evidence on the issues they share. That saves money and it concentrates risk, because a single adverse finding on a common issue now lands on every appeal in the group.
Whether that trade is worth making depends on how similar the appeals really are, and the answer is usually less similar than the appellant assumes.
When the Inspectorate links appeals
Linking is a case management decision rather than a statutory one. The Inspectorate's procedural guidance sets out that appeals may be heard together where they relate to the same site, or where they are sufficiently closely related that hearing them separately would waste time and duplicate evidence.
The combinations that come up most:
- An appeal against refusal of planning permission and an appeal against an enforcement notice on the same land.
- Two or more applications on the same site refused for related reasons, for example a full application and a listed building consent application.
- Several sites promoted by the same appellant in one district, refused on the same policy ground such as housing land supply.
- A scheme straddling an authority boundary, refused by both authorities.
Note that similar is not the same as related. Two unconnected housing refusals in different parts of a county, both turning on the tilted balance, are similar cases and are not naturally linked.
One event, separate decisions
This is the detail that matters most and is misunderstood most often, so it is worth stating plainly: even where appeals are conjoined into a single inquiry, each appeal is determined by its own decision. The inspector issues a decision letter for each appeal reference.
That has three consequences.
Each decision stands or falls on its own, so one appeal can be allowed and another dismissed from the same inquiry.
The reasoning on a common issue will be consistent across the decisions, because it comes from the same inspector on the same evidence. There is no prospect of inconsistent findings on a shared matter, which is one reason appellants sometimes want linkage.
The conditions attached to one permission may differ from those attached to another, and they are drafted per appeal. Reading each letter in full matters, and the structure is the same as for any single appeal, as set out in how to read a planning appeal decision letter.
Advantages of a single event
The savings are real and they are mostly in witness time.
| Resource | Separate appeals | One conjoined event |
|---|---|---|
| Expert witnesses on common issues | Proof and attendance for each appeal | One proof, one attendance |
| Site visit | One per appeal | Usually one visit covering all sites |
| Statement of common ground | One per appeal | Often a single document on shared matters |
| Inquiry venue and programme officer | Duplicated | Shared |
| Advocate's preparation | Repeated | Largely shared |
On three housing appeals turning on the same five year supply position, the supply evidence is written once and given once. That is the whole commercial case for linkage, and on a contested supply position it is substantial.
There is a softer advantage too. A single inspector hearing the cumulative picture may take a different view of the authority's position than one hearing a single site in isolation.
Evidence that has to be kept separate
Linkage does not merge the appeals, and the discipline that makes a conjoined inquiry work is keeping the site-specific evidence distinct.
Structure the proofs accordingly. A common section dealing with the shared policy issue, then a site-specific section for each appeal, cross-referenced rather than repeated. The inspector needs to be able to lift the reasoning for appeal B without importing a fact that applies only to appeal A.
Three traps.
Landscape and visual evidence is rarely common in substance. Each site has its own character, its own views and its own receptors, and a single landscape proof covering four sites invites the criticism that the assessment was generic.
Highways evidence may be common on policy and specific on access. Separate them explicitly.
Viability and deliverability are site-specific by nature, and an appellant arguing cumulative need across several sites still has to show each one is deliverable.
Costs applications on linked appeals
Costs are decided per appeal. An award on one appeal in a conjoined group does not follow across to the others, and an application has to be made in respect of each appeal where it is pursued.
That creates an apportionment problem. If the authority behaved unreasonably on one appeal and properly on two others, the costs attributable to the unreasonable conduct have to be identified within a shared event. Keep time records separated by appeal from the start, because reconstructing them afterwards is close to impossible.
Where an authority changes its case during a conjoined inquiry, the position is the same as on any appeal but the exposure is larger, since the change affects several decisions at once. The practical handling of that situation is covered in appeals where the council changes its case.
Two authorities on the same inquiry
Cross-boundary schemes produce the most complicated version of this. Each authority is a separate party with its own statement of case, its own witnesses and its own officers, and the two may not agree with each other.
What to settle early:
- Whether the authorities will present a joint case or separate cases on the shared issues.
- Who leads on each issue, so the appellant is not answering the same point twice from two directions.
- Whether the section 106 obligations can be drafted as a single agreement with both authorities as parties, or need to be two agreements.
- How conditions will be worded so that the two permissions are capable of being implemented together.
The fourth is the one that causes real trouble after the decision. Two permissions for one scheme, with conditions drafted independently, can produce incompatible requirements, and resolving that means applications to vary conditions in two authorities.
Asking for linkage, or resisting it
You can ask. Raise it on the appeal form and in a covering letter, explaining why the appeals turn on the same issues and what the saving would be. The Inspectorate's case officer decides.
You can also resist it, and sometimes should. The argument against linkage is that the issues differ materially, that the sites are not comparable, or that a weaker appeal in the group would prejudice a stronger one. Make that case in writing with specifics rather than as a general preference.
Three questions worth answering honestly before you request linkage. Would you be content for the weakest appeal in the group to be heard alongside the strongest. Is the common issue really the decisive issue in each case. And can your witnesses give evidence on four sites to the same standard as on one.
If the answer to any of those is no, run them separately and accept the duplicated cost.
Whichever route you take, the policy case has to be made for each site. A Planning Statement structured to the development plan and the current National Planning Policy Framework for each appeal site is the foundation the proofs sit on.
Enter your postcode on PlanScope to see which reports each site in a multi-site appeal is likely to need.
This is general guidance, not legal advice. Check the position with a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Do linked appeals get one decision or several?
Several. Even where appeals are conjoined into a single inquiry with one inspector, each appeal is determined by its own decision letter. One appeal can be allowed and another dismissed from the same event, and the conditions attached to each permission are drafted separately.
Which appeals are typically heard together?
A refusal appeal and an enforcement appeal on the same land, related applications on one site such as planning permission and listed building consent, several sites promoted by the same appellant and refused on the same policy ground, and schemes straddling an authority boundary refused by both councils.
What is the main risk of linkage?
A single adverse finding on a common issue lands on every appeal in the group. Where the shared issue is the decisive one, linkage concentrates the outcome in one inspector's conclusion. It also exposes a stronger appeal to being heard alongside a weaker one.
How are costs handled on conjoined appeals?
Per appeal. An award on one does not follow across to the others, and an application must be made in respect of each appeal pursued. That creates an apportionment problem within a shared event, so keep time records separated by appeal from the outset rather than reconstructing them later.
What goes wrong on cross-boundary schemes?
Conditions drafted independently by two authorities can produce incompatible requirements on two permissions for one scheme, which then needs applications to vary conditions in both areas. Settle condition wording and whether the section 106 obligations are one agreement or two before the inquiry rather than after.
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.