How to use data to strengthen a planning argument

Research is the typical activity used to develop planning arguments and statements. From 1 April 2026, most planning appeals will be formed from information contained in the original planning submission. Planning intelligence now needs to be part of your process — to identify and develop approaches to development, or responses to applications submitted. Early identification and amplification of planning policy has never been more important.

You don't have time to endlessly search through local authority records to find related cases. Stop searching, start using targeted search in your planning preparation and build it into your workflow. This can save you time, strengthen your argument, and give you policy interpretation that matters.

What is changing?

From 1 April 2026, procedures to appeal planning applications are changing. The planning argument has never been more important — and it will no longer be enough to add to a planning argument or provide further technical evidence once an appeal is lodged.

The sheer volume of planning data can be overwhelming. Simply finding a "similar case" isn't enough if you don't know why it was allowed or dismissed. We make it simple to search by policy, surface key policy interpretations, and link to the original Inspector's report or planning application so you can verify matters yourself.

Why this matters

Simply put — the "submit once, submit well" model of planning application will become more important going forward. The quality of the planning statement and interpretation of planning policy has never been more critical.

We have identified 1.4 million Decisive Arguments and display them separately within every case. We surface the original text and provide links to the original documents so you can verify or cite sources directly. Displaying the specific policy interpretation helps you strip away the noise and build a planning statement that cites policy with the confidence of an Inspector's interpretation.

Insight: common policy misinterpretations

We've looked at some of the most commonly misinterpreted policies — Grey Belt, Tilted Balance (and Footnote 7), and Heritage Harm.

Grey Belt

Councils often argue that land is not "Grey Belt" because it isn't "ugly" or "poor quality."

The interpretation gap: Inspectors have consistently ruled that Grey Belt is a designation of land function, not aesthetic quality.

Example case: APP/R3650/W/25/3375453 (Churt, Farnham). The Inspector allowed the appeal, clarifying that "Grey Belt" status does not depend on the quality of the land, nor must it be within a settlement boundary.

"Tilted Balance" & Footnote 7 (NPPF 11d)

Councils frequently misinterpret when the "tilted balance" is switched off by heritage or flooding constraints (Footnote 7).

The interpretation gap: LPAs often treat Footnote 7 as an "automatic veto." The Planning Inspectorate has clarified that the heritage balancing exercise must still be performed first.

Example cite: Gladman Developments v SS (2026 EWHC 51 Admin). This case confirms that even if the tilted balance is engaged via housing land supply, it can be disengaged if specific restrictive policies (such as the Sequential Test for flooding) provide a clear reason for refusal.

Heritage harm vs. public benefit (NPPF 215)

"Less than substantial harm" can be used inappropriately in planning. It is not a catch-all term that automatically allows for consent.

The interpretation gap: LPAs often give "Great Weight" to harm but "Modest Weight" to housing benefits. Inspectors are increasingly giving "Very Substantial Weight" to housing delivery in areas with less than a 3-year supply, effectively overriding heritage harm. However, this is a highly nuanced and changing area of interpretation, made on a case-by-case basis. Less than substantial harm still needs to be considered within policy.

Example case: APP/D1835/W/25/3376030 (South Worcestershire). This demonstrates the negative side, where public benefits (mobile technology) were not enough to outweigh heritage harm — showing the precision needed in the balancing argument.

How to adapt

• Use smart filters: Filter your search by "Decisive Arguments", "Local Authority", and "Policy References." Our insight also offers data on individual policies.
• Trace the policy: We have tagged 845k policy references. See exactly how Paragraph 11(d) of the NPPF is being interpreted in your specific county this month.
• Find the latest policy interpretation: Our records are updated daily from the PINS website. You can track live appeals, be notified of decisions quickly, and save and share searches within a team.
• Verify all sources: Being able to read and check original Inspector's reports or see the original planning application helps to provide an end-to-end overview. Compare Local Authority decisions against Inspector's policy interpretation.

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We will be posting every day this week with tips and comments on the new Planning Inspectorate's guidance, including their position on AI. See the new PINS procedural guidance for yourself for applications dated on or after 1 April 2026: https://www.gov.uk/guidance/planning-appeals-procedural-guide-for-appeals-relating-to-applications-dated-on-or-after-1-april-2026#introduction