Planning Reform 2026: Planning Applications Must Be 'Appeal-Ready' from Day One

Vital information you need to know before submitting a planning application or planning appeal after 1 April 2026. 

The Planning Inspectorate has confirmed important changes to the written representations appeal process in England. This is the route whereby the majority (92%) of planning appeals are decided.

Under the new rules, the option of supplying further information at appeal will be removed, and so the details submitted at the initial planning application stage will determine the outcome of the application. 

The reforms will completely reshape how most appeals are handled and require a radically new strategy when making an initial planning application. 

The new appeals system reinforces a principle we at Salmon Planning + Architecture have long championed: a well-prepared application is the strongest foundation for success.

What Changes in Practice?

Under the new appeals procedure:

• There will be no Statement of Case or final comments stage for either party.

• The Inspectorate will only consider material that was submitted to the Local Planning Authority (LPA) during the planning application process.

• The LPA’s position will be based on the case officer’s report, and committee minutes (where relevant).

• No additional comments from third parties will be accepted at appeal stage.

In effect, the appeal will be determined on the documentation that already exists at the point of refusal of the initial planning application.

Exclusions to the New Process

• Non-determination appeals (where the LPA has failed to issue a decision within the statutory period)

• Appeals relating to listed building consent

• Appeals concerning lawful development certificates

A Strong Application Becomes Critical

The new guidance makes the position clear that appellants must be satisfied, at the point of submitting their appeal, that their original application set out the full planning case.

Inspectors will, in future, only accept new evidence in exceptional circumstances. 

Where revised plans or additional technical information (for example, a more detailed report addressing a refusal reason) could resolve matters, the new guidance indicates that a fresh application to the LPA may be more appropriate than pursuing an appeal.

This represents a real cultural shift because appeals will no longer provide a meaningful opportunity to introduce new supporting material to strengthen a case.

It is important to be aware that under legislation that came into effect on 1 April 2025, the ability to submit a new planning application for a similar project without incurring a further application fee was removed. This change re-emphasises the fact that planning applications must in future be 'appeal-ready' from day one. 

This is the most significant takeaway.  Planning applications will need to be comprehensive, well evidenced and strategically framed at the point of submission.

Applicants will need to engage proactively with consultee feedback during determination and ensure technical evidence is sufficiently robust from the outset. The ability to pursue an appeal for non-determination - where a full Statement of Case remains permissible - is likely to become an increasingly important strategic option.

In short, once the decision notice is issued, there will be little room for correction later other than via a new planning application.

Final Thoughts

The message from the new guidance is clear - the application stage is now even more critical. Appeal is no longer a second opportunity to strengthen your case, instead it is largely a review of the application already made to the LPA.

With our combined expertise in planning strategy and architectural design, Salmon Planning + Architecture is ideally placed to guide clients through this evolving landscape - ensuring proposals are robust, responsive and ready to withstand scrutiny.

We operate across the South West with offices in Somerset and Devon. Please do not hesitate to make contact to discuss the issues discussed above on 01749 671500 or by email info@salmonplanning.co.uk

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