Planning decisions are not made in isolation. Every LPA develops patterns — how it interprets character and appearance, what scale it considers acceptable in a conservation area, how it applies AONB policy to extensions and conversions. Comparable decisions are the evidence base for understanding that pattern. Finding them is the problem.
Local planning policy sets the framework. Comparable decisions reveal how the framework is applied in practice — which are often different things. An LPA that states in its Local Plan that extensions in conservation areas will be assessed on their impact on character may routinely approve extensions of a particular scale and form, or may routinely refuse them regardless of design quality.
The comparable decisions in the surrounding postcode cluster tell you which it is. They tell you what the conservation officer actually considers acceptable, what the committee has been willing to approve on appeal, and where the real policy boundary sits. This is information you cannot get from reading the Local Plan.
A standard planning portal search returns applications for a specific address and, at best, a list of recent applications in the surrounding area filtered by what the portal's public interface is designed to show. This is not a cluster analysis. A proper cluster sweep retrieves every application — approved, refused, withdrawn, appealed — across the full postcode cluster, including applications that may have been withdrawn before decision, decided under a predecessor authority, or held in legacy systems behind portals that block automated access.
The difference in what you find is significant. Withdrawn applications, in particular, are almost entirely invisible to standard portal searches. An application that was withdrawn five weeks before the committee's decision — because the applicant knew it was going to be refused — tells you exactly where the policy boundary sits without a formal refusal on the public record.
Officer reports are the richest source of comparable reasoning in the planning system. They articulate how a specific case officer or the LPA generally interpreted the policy tests applied to a specific design on a specific site. When a cluster sweep retrieves officer wording from comparable consents, that wording can be cited directly in a pre-application submission or in a design and access statement.
The most effective use of comparable officer wording is to show the case officer that a specific design approach has already been approved under the same policy framework on a comparable site. This shifts the conversation from “is this acceptable?” to “here is the precedent that shows it is.”
Planning appeal decisions are published by the Planning Inspectorate and are theoretically accessible. In practice, finding the relevant appeal decisions for a specific policy question in a specific area requires searching across multiple systems, cross-referencing decision notices with appeal records, and reading a substantial volume of material to find the relevant reasoning.
A cluster analysis that includes appeal outcomes — particularly for the specific policy tests most likely to be applied to a given scheme — is the most direct way to understand where the LPA's decision-making has been overturned and why. Inspectors are consistent: if a comparable scheme was approved on appeal on a specific policy ground, that reasoning applies to your scheme too.
Not all UK councils use the same planning portal software. Some run on Civica Portal 360, which blocks all automated access at DNS level. Others run on legacy systems that were implemented before the current national standards. Pre-merger councils — whose planning records predate reorganisation — may hold their historical records in systems entirely separate from the current portal.
We sweep 1,000+ planning records across the postcode cluster — approved, refused, withdrawn and appealed. Officer wording extracted for the most relevant comparables. Delivered in 48 hours.
Commission a cluster analysis →