Planning Permission Challenged? What Happens Next

Have you had your planning permission challenged after the council approved your application? Perhaps a neighbour has written to the council, a solicitor has sent a letter threatening judicial review, or court papers have arrived. Getting permission felt like the finish line. Now you are being told that you might lose it.

There is an important difference between someone objecting to your scheme and someone bringing a legal challenge to the decision granting permission. A neighbour cannot simply appeal against your council’s decision to grant permission. They may, however, ask the High Court to review whether the decision was lawful.

We explain what that means for your permission, whether you should continue building, the court procedure, costs and the protections introduced in 2026. This guide concerns England. For the different routes following an Inspector’s decision, see our judicial review overview and Section 288 guide.

Has your planning permission actually been challenged?

Planning permission challenged by a neighbour? Not every angry letter is a court case. A neighbour might complain to the planning department, ask a councillor to intervene or instruct a solicitor to send a pre-action letter. Those steps can be serious, but they do not themselves invalidate your permission. Filing means lodging the claim with the court. Proceedings formally start when the court issues the claim form, as explained in rule 7.2 of the Civil Procedure Rules (CPR). Issuing a claim is not the same as winning it.

There are two distinct questions: has a challenge been started, and has the court given the claimant permission to proceed? That distinction matters for legal costs, next steps and the 2026 rules extending implementation periods.

Can your neighbour overturn an approval just because they object?

No. There is no ordinary third-party right of planning appeal against a council’s grant of permission. A judicial review examines the lawfulness of the council’s decision, not whether a judge personally likes your development.

Potential grounds include a material error about the law or planning policy, failure to consider something legally relevant, an unfair consultation process, a serious procedural defect or irrationality. Disagreeing about overlooking, parking, noise or the character of the street is not enough on its own. Those are normally matters of planning judgement for the council, provided it approached its legal duties correctly.

In R (Holborn Studios Limited) v London Borough of Hackney [2017] EWHC 2823 (Admin), a permission was quashed after the council failed to reconsult fairly on substantial amendments. That is an example of a legal defect in the process, not a court deciding that one architectural design was better than another.

Which court route applies to your approved scheme?

What matters is who granted your permission. A council’s own grant usually faces ordinary judicial review. An Inspector’s grant after a planning appeal usually faces a Section 288 statutory challenge instead. There are special cases, including enforcement appeal decisions and listed building consent. Do not assume all approvals have the same deadlines or service requirements.

• Council-granted permission: ordinary judicial review, with the claim form normally filed within six weeks after the grounds first arose, under CPR 54.5(5)
• Permission granted by an Inspector on appeal: normally Section 288 of the Town and Country Planning Act 1990, with a separate six-week statutory period and specialist service requirements
• Enforcement appeal outcome: different aspects can engage Section 288 or Section 289

For ordinary judicial review of a planning permission, the relevant date is usually the formal grant, not an earlier committee resolution to approve subject to a legal agreement. The distinction is illustrated by R (Burkett) v Hammersmith and Fulham London Borough Council [2002] UKHL 23. Court deadlines are extremely short. A pre-action letter, negotiation or council complaint does not pause them.

Planning permission challenged: what should you do first?

1. Preserve every document: the decision notice, approved drawings, conditions, planning officer’s report, consultation responses, committee papers, Section 106 agreement and correspondence
2. Identify the stage: distinguish an objection, pre-action letter, sealed claim, permission order and final judgment
3. Instruct a specialist planning solicitor: judicial review is litigation, not a normal planning appeal; get advice about the legal arguments, service and immediate deadlines
4. Tell the council and your planning consultant: the authority made the challenged decision, but its preferred response may not be identical to yours
5. Review work on site: ask whether to pause contracts, major purchases or irreversible construction while the risk is assessed
6. Check the money: notify any relevant insurer or lender in line with your obligations and investigate legal-expenses cover
7. Keep communications disciplined: do not make admissions, agree a redesign or assume the claimant will withdraw without taking advice

A solicitor may have to act within days, particularly where an injunction is threatened. If you have had your planning permission challenged, the best first response is to establish exactly what has happened rather than to assume that approval is lost or that the threat can be ignored.

Should you stop building if your planning permission is challenged?

The court claim does not automatically stop development. Unless the court orders otherwise, the grant is not suspended merely because judicial review proceedings have begun. Someone opposing the scheme may seek urgent interim relief, such as an injunction, and its exact wording must be obeyed.

But being legally able to continue is not the same as being commercially wise to continue. If the court eventually quashes permission, you may have spent money on a scheme which can no longer rely on that consent. The council may need to determine the application again. It could lawfully grant permission again, possibly with changes, or refuse it. Works already carried out can create serious planning, contractual and financial difficulties, including possible enforcement. None of this means a court challenge automatically orders demolition.

We would normally review the strength and nature of the grounds, whether any injunction is sought, how far the build has progressed, the possibility of a lawful alternative permission, the risk to finance and the costs of pausing. Building regulations approval and private agreements do not replace planning permission.

Who defends a planning permission challenge?

In an ordinary judicial review of a council’s planning decision, the council is usually the defendant. The successful applicant or developer is usually an interested party, because the court proceedings directly affect the benefit of their permission.

Do not assume the council will defend your approval to the end. It might defend the decision, accept part of the criticism, reconsider its position or agree that its decision should be quashed. A concession by the council does not by itself replace the need for an appropriate court order, and a developer may want independent advice about whether and how to oppose an agreed disposal.

Under CPR 54.7, the claim form is generally served on the defendant and identified interested parties within seven days of issue. A person served who wishes to take part normally has 21 days after service to file an acknowledgment of service under CPR 54.8, with separate service requirements. This is not a universal response deadline for every specialist statutory challenge. Missing it can restrict participation and may affect costs.

An interested party may instruct its own lawyers and present arguments or evidence in accordance with the rules and court directions. Whether to participate actively, and how much work to duplicate from the council, requires a proportionate costs strategy.

What happens during the court proceedings?

A typical ordinary judicial review can involve a pre-action exchange, issue and service of the claim, acknowledgments of service, the court deciding whether to give permission to proceed, then detailed evidence and a substantive hearing if the case continues. There may be interim applications and appeals along the way. Not every claim reaches a full hearing, and cases can be resolved by consent subject to the court’s powers.

Permission to bring a judicial review means the court considers there is an arguable case meeting the applicable test. It is not a finding that your planning permission is unlawful. Conversely, a claim which survives that stage deserves serious attention.

Does the six-week window mean the permission becomes completely safe?

Planning permission challenged after the usual six weeks? An ordinary judicial review of a council’s grant normally must be filed within six weeks after the grounds first arose. A late ordinary judicial review may still be attempted, but an extension is exceptional and must not be assumed. Specialist statutory review deadlines can be non-extendable. Also check whether a claim was filed in time rather than relying only on whether you have received papers.

In R (Gerber) v Wiltshire Council [2016] EWCA Civ 84, the Court of Appeal restored a developer’s permission after a challenge made late in circumstances where the developer had relied on it. The case is a useful reminder that delay and prejudice matter, but it does not create an automatic certificate of immunity six weeks after every planning decision.

Does a legal challenge extend the time to start building?

Sometimes, and the rules changed on 18th February 2026. Section 56 of the Planning and Infrastructure Act 2025 amended the time-extension rules for qualifying permissions relating to development in England.

For a full permission within section 91 of the Town and Country Planning Act 1990, the qualifying events can extend the implementation period as follows:

• One year when a court grants permission to bring the relevant legal challenge
• A further year if a party is granted permission to appeal to the Court of Appeal against a decision determining the challenge after a full hearing
• A further two years if a party is granted permission to appeal to the Supreme Court against a decision determining the challenge after a full hearing

A solicitor’s letter or the mere filing of proceedings does not automatically create the first one-year extension. The court must grant permission to bring the challenge. An implementation period which has already expired cannot be revived by these new provisions. The actual expiry date, transitional rules and any overlapping extensions must be checked against the statutory wording.

Section 92A introduces detailed rules for outline planning permission and the approval of reserved matters. It can protect both the reserved matters application period and implementation periods, but the interaction between them is more complicated than simply adding a year to every deadline. Get the relevant dates calculated for the actual permission. The protections do not remove the need to comply with pre-commencement conditions or make a lawful start.

For an overview of normal commencement rules, see our guides to full planning permission and keeping planning permission extant.

What if the court quashes your permission?

A quashing order sets aside the challenged decision, subject to the order’s precise terms. The planning application may have to be reconsidered lawfully. The judge does not ordinarily remake the planning balance or automatically refuse your scheme. In an appropriate case, the court also has powers relating to suspended or prospective-only quashing orders under section 29A of the Senior Courts Act 1981. You must not assume those protections will be ordered.

Ask immediately whether there is another extant permission, whether works can be authorised by a fresh application, what the court has ordered and whether enforcement issues arise. The decision-maker may lawfully reach the same outcome again after correcting the flaw, but that cannot be promised.

Finding a legal error does not always mean that permission will be quashed. Under section 31 of the Senior Courts Act 1981, the court must refuse relief if it is highly likely that the outcome for the person bringing the claim would not have been substantially different without the error, unless the exceptional public interest provision applies. A corresponding test applies at the permission stage when the court considers that question.

Who pays for the challenge?

Having your planning permission challenged in the High Court brings different costs from an ordinary planning appeal. You may face your own specialist solicitor’s and barrister’s bills, expert costs and the possibility of an adverse costs order if you participate. An interested party is not necessarily treated exactly like the defendant for costs purposes. Agree the scope and likely cost of participation before duplicating work the council is already undertaking.

In some qualifying environmental judicial review proceedings, the Aarhus Convention costs regime may limit adverse costs liability, subject to the detailed rules and any court variation. It is not automatic insurance for a developer, and it does not pay your own legal fees. The relevant provisions are CPR 46.24 to 46.28. Ask about insurance, funding, costs exposure and whether the claimant or defendant can actually meet a costs order.

How Planning Geek can help

For anyone with planning permission challenged in court, the legal proceedings belong with a specialist planning solicitor. Planning Geek can help on the planning side: checking the development plan and policy position, assembling the complete application and committee history, examining officer reports and representations, and considering whether an alternative planning route exists. That planning analysis can assist the solicitor in assessing the alleged defect and the practical consequences.

We do not provide High Court representation or legal advice about conducting proceedings. If court papers have been served, obtain legal advice immediately. For planning consultancy support alongside that advice, request a quotation.

Primary sources and related guidance

• Civil Procedure Rules Part 54: judicial review and the Planning Court
• Planning Court Practice Direction 54D
• Town and Country Planning Act 1990, section 288
• Planning and Infrastructure Act 2025, section 56
• Senior Courts Act 1981, section 31

Other Planning Appeal Sections

Planning Permission Challenged Page Created: 23rd October 2026