When I sit down with a new client to discuss their dream self-build or major renovation, they sometimes have a stack of beautiful architectural drawings ready to show me. They must have spent months perfecting the floorplan and choosing the right windows. But as a planning consultant, my first question often baffles them: ‘What is the written argument for this?’
A common misconception is that a planning application is a visual beauty contest. People assume that if the house looks ‘suitable’ the council will naturally say yes and give a grant Planning permission. In reality, the planning system is a complex legal and policy-driven machine, and your drawings are only half the story.
To progress your project, you need a written description in the local authority’s language. Depending on what you are trying to achieve, this will be either Planning Statement For complete application or a Statement of support For lawful development certificate. In this article I’ll explain what each one is and how to make sure you interact with them correctly.
What is a planning statement?
While design is important, the ‘principle of development’ is the most critical hurdle. The fundamental question is whether building should be allowed on that particular A plot of land Absolutely if the theory is wrong, the most beautiful design in the world won’t save you.
To decide on this crucial first question, the planning officer will have to weigh your proposal against a mountain of local and national policies. If you leave them to do it entirely on their own, you are leaving the fate of your project to chance. The planning statement is where I lead this. It is not just a description of the project, it is a structured argument.
I recently worked with a client who had a large, overgrown garden on the edge of an affluent village. For most people, it seemed like the perfect place for a new, high-quality home. However, the council’s settlement boundary – an invisible line on their maps that determines where building is allowed – did not include the site, leaving the garden technically in open countryside. On paper, the council’s policy was a ‘no’ to new houses outside the line.
In the planning statement, I didn’t focus on bricks and mortar. Instead, I focused on National Planning Policy Framework (NPPF) and the concept of sustainable development.
I argued that because the site was within walking distance of the local primary school, shops and pubs, it was a sustainable location for a new home. I also checked the council’s housing figures and found that they are not meeting their targets for new homes in the area. This allowed me to call what we call a ’tilted balance’ where the need for housing outweighs minor conflicts along local boundary lines.
By framing the application as a way for the council to sustainably meet its own housing obligations, we won the argument. The Planning Statement turned a policy objection into a policy solution. Without that document, the official would have looked at the site on their map, noted it was outside the development boundary and issued a refusal within days.
A good planning statement also serves as a pre-emptive strike against objections and Refusal of planning permission. If I know a site has potential drainage issues or road access is a bit narrow, I address those issues. I cite technical reports and explain how the design mitigates these concerns.
By the time the planning officer reaches the end of the statement, you want them to feel that every potential problem has been resolved. You are making it as easy as possible for them to write their report in your favor.
What is a supporting statement?
When we move away from complete planning applications and into the world of Legal Development Certificates (LDCs), the tone of writing changes completely.
LDC is not about whether a project is ‘good’ or ‘sustainable’ – it is about whether it is legal under the law. This is generally used for projects under Approved development (PD) rights, which are works you can do to your home without needing a full planning application.
Many homeowners assume that because something has a development permit, they can build it and forget about it. However, the rules for PD are notoriously selective. If your extension is just a centimeter too high, or if you use the wrong type of cladding at side height, the whole thing becomes illegal. This can cause a nightmare when you come to sell your home and the buyer’s lawyer wants proof that everything is above board. This is where the supporting statement for LDC comes in.
Unlike a planning statement, which is an argument of opinion and policy, a supporting statement for an LDC is a technical and legal brief. It’s about ticking boxes.
I recently had a client who wanted to build a very large outbuilding at the bottom of their garden to be used as a home office and hobby room. Neighbors were convinced it was too big and were already calling the council to complain.
In a supporting statement, I cautiously passed the General Permitted Development Order (GPDO). I calculated the height of the eaves from the highest point of the adjoining land, I showed that the building occupied less than 50% of the house, and I explained why the use of the building was incidental to the enjoyment of the main residence.
Because we provided this level of detail in advance, the council’s legal team could immediately see that the project met every criterion of the law. Garden room planning permission. The planning officer had no room for discretion or decision making. They had to issue the certificate because we have proved the legitimacy of the project beyond doubt.
For the homeowner, that piece of paper was worth its weight in gold, as it provided complete peace of mind and protected the value of their property.
What is the certificate of legality for existing use or development?
There is another type of supporting statement that is perhaps the most important: the statement used to certify legality for existing use or development (CLEUD). You need this if you’ve already built something without permission, or if you’ve been using the building for a specific purpose for a long time – such as living in a converted barn that never received formal consent.
In these cases, the supporting statement is an evidence log. You are not arguing about policy at all; You are trying to prove a historical fact. I worked on a case where a client had lived in a caravan in woodland for over 10 years. To legitimize it, we had to prove that they had been there continuously for that entire decade. My supporting statement for that application was almost like a detective’s report. I included old utility bills, Amazon delivery receipts, letters from the GP and dated photos of the client’s dog in front of the caravan from puppy to old dog.
By weaving together this evidence into a clear, chronological narrative, we were able to satisfy the Council that the 10-year rule had been met. Without that structured statement to explain how the evidence is linked together, the stack of receipts would be meaningless. We successfully secured the certificate, and the client now has a permanent, beautifully designed and importantly, legal home where they once lived in fear of an enforcement notice.
The difference between winning and losing
You might wonder why you don’t just let the planning authorities figure this out for themselves. After all, they are the experts, right? The reality is that planning departments across the country are under tremendous pressure. Officers have dozens of cases on their desks at any given time.
If you submit a planning application with just drawings and a basic form, you’re asking the officer to do all the heavy lifting. You ask them to find policies that support you, check the legal limits of your PD rights, and argue any objections.
If an officer is tired and overworked, they are more likely to take the path of least resistance. If a neighbor objects and you have not provided a written argument to counter it, the officer may find it easier to reject the application and let you deal with it on appeal. By providing a professional planning statement or supporting statement, you essentially provide the officer with the skeleton of their own report. You are giving them the support they need to say ‘yes’.
I often tell my clients that a Job of Planning Consultant 10% about design and 90% about communication and we are translators. Also offers Pre-application adviceWe take your vision for a beautiful home and translate it into the specific technical language that councils require.
A planning consultant’s tips for success
are you looking Creating an extension or brand new Self-build house On a complex site, don’t underestimate the power of the written word. A planning statement or supporting statement is your voice in the process. It allows you to negotiate on your terms rather than leaving it to the whims of the council or the complaints of your neighbours.
Before you submit your next planning application, take a good look at your project through the eyes of a planning officer. Ask yourself: Does this meet the specific wording of the Local Plan? Does it comply with every line of the Permitted Development Act?
If the answer isn’t immediately obvious from your drawing, you need a statement to fill in the gaps. And don’t think that a machine can do this for you. AI-generated statements are full of policy errors – believe me, I’ve seen plenty of hollers. And AI can’t know what a person who has seen your site with their own eyes can, so if you’re not ready to make these assertions yourself, get a fully human planning consultant to help you. Achieve planning permission success.
In the planning world, it’s the person who tells the best story—backed by the most solid evidence—that gets you the permission you need.
Along with the above documents, there are other key items which Planning officers want to look into the planning application. Taking the time to make sure you cover all the bases is key Obtain planning permission.
