Strategic Thinking in Planning: What an Appeal Victory Tells Us About Alignment, Reality, and Foresight

By Simon Rix, Founder and Senior Strategy Consultant at Planix.uk Planning Consultants

When people think about planning permission, they often imagine architectural drawings, site layouts, or debates about whether a design fits the street scene. But after years of helping people get the consents they need, I’ve come to realise that successful planning is rarely about drawings alone - it’s about strategy.

To achieve a positive outcome when the odds are stacked against you, you have to think like a strategist. That means:

• Aligning with your overall objectives.

• Appreciating the reality of the situation.

• Anticipating what decision-makers will do, how they interpret evidence, and where the legal forks in the road lie.

A recent appeal victory I secured for a client in Cornwall - involving a Lawful Development Certificate (LDC) - is a textbook example of why this strategic mindset matters.   

The Situation: Reality vs. Assumptions

My client owned a home in Cornwall with an adjacent parcel of land that his family had enjoyed for over a decade for social gatherings, dog walking, barbecues, and garden maintenance. He wanted to formally secure its lawful status as an incidental residential garden through an LDC.   

Cornwall Council refused the application. Why? They fell into a trap that many local planning authorities fall into: confusing visual appearance with legal use, and blurring the line between "curtilage" and the wider "planning unit". They looked at snapshot aerial photos, questioned mown grass and picnic benches, and declared that 10 years of continuous residential use hadn't been proven.   

The Three Strategic Pillars of the Win

1. Appreciating the Reality of the Situation (and the Law)

To win a complex planning case, you must appreciate the legal reality rather than relying on standard assumptions.   

In planning law, "curtilage" and "planning unit" are fundamentally distinct concepts. A piece of land can sit outside a house's immediate curtilage while still legally forming part of the same overall planning unit. Furthermore, the law dictates that incidental residential use of land can become immune from enforcement action - and therefore completely lawful - if it has continued uninterrupted for 10 years.   

While the Council relied on snapshot Google Street View images and officer impressions from a distance, we based our case on rock-solid, uncontradicted evidence of everyday reality: sworn statutory declarations, maintenance history, and family photos.   

2. Anticipating Decision-Makers and Legal Forks in the Road

A good strategy never relies on a single point of failure. You must anticipate how an Appeal Inspector or Council officer might interpret complex legal tests.

In our Statement of Case, we presented two alternative legal routes to establish lawfulness:

• Route A: The land formed part of the residential curtilage.   

• Route B: Regardless of curtilage, the land was part of the wider residential planning unit and had achieved immunity through 10 years of continuous incidental residential use.    

When the Planning Inspector evaluated the appeal, he found that the land sat too far off to be formally deemed "curtilage".   

Because we had anticipated this exact scenario and thoroughly constructed Route B, the Inspector concluded that the land formed part of the same single planning unit and that our evidence of 10 years' continuous incidental residential use was undisputed and conclusive.

The appeal was allowed, and the certificate was granted.   

3. Aligning Every Step with Your Overall Objectives

It is easy to get lost in academic debates about planning definitions, but strategy is always about the end goal. My client’s true objective wasn't to win a debate on where the curtilage line was drawn; it was to protect his property rights and secure the legal status of his garden for the future.   

By aligning our appeal strategy directly with that end goal, we delivered total victory for the client - and secured an application for costs against the Council.   

Thinking Ahead on Your Next Project

Whether you are seeking a Lawful Development Certificate, building an extension, or taking an appeal to the Planning Inspectorate, success isn't about luck. It’s about anticipating how decision-makers think, appreciating the nuanced reality of planning law, and keeping every step aligned with your ultimate objectives.   

At Planix.uk, this strategic, evidence-led approach is at the core of everything we do. If you are facing a tricky planning decision or a council refusal, don't just react - strategise.

Thinking about your next property move or facing a planning challenge? Feel free to reach out to me and the team at Planix.uk to discuss how we can build a winning strategy for your site.