What kind of planning application do you actually need?

Planning can feel like the trickiest part of extending your home and it's often the bit people are most nervous about. I get it. The terms sound official, the rules aren’t always crystal clear, and no one wants to fall foul of the council or get stuck in a long, expensive process they didn’t need to go through in the first place. The good news? Not every home project requires full planning permission, and understanding what does apply to your specific build can save you time, money, and a lot of unnecessary back-and-forth.

So, let’s demystify the main types of applications: permitted development, householder planning applications, and lawful development certificates - and when you might need each.

Permitted Development (PD)

This is the golden ticket of home projects. Essentially, it's what you're allowed to build without applying for full planning permission. Things like single-storey rear extensions, loft conversions, certain types of outbuildings, and porch additions often fall under PD if you meet very specific size, height, and location rules. The catch? Not every home benefits from permitted development rights. If you live in a conservation area, a listed building, or a flat (yes, even if it’s in a house), the rules might not apply or might be more restricted.

Householder Planning Application

This is the one you’ll need if your proposed work doesn’t meet the criteria for permitted development. For example, if your extension is a little too large, too tall, or in a protected area then it’s a formal application submitted to the council and open to public comment (which is where your neighbours come in). The process usually takes eight weeks from validation, though timing can vary depending on the council. It’s not something to fear but it is something to plan for. Getting your design right first time and submitting clear, accurate drawings can make all the difference.

Lawful Development Certificate (LDC)

This is where it gets a little technical. So even if your extension does fall within permitted development, it’s still worth applying for a lawful development certificate. Why? Because it gives you formal proof that your build was legal at the time it was constructed. That can be a lifesaver if you ever come to sell your home or get questioned down the line. It’s not compulsory, but it’s highly, highly recommended. Think of it as your planning peace of mind.

So, what kind of application do you need? The answer depends on what you’re building, where you live, and how your home’s been altered in the past. There’s no one-size-fits-all answer, which is why it’s worth getting good advice early on. A little clarity at the beginning can save months of delays later.

If you’re sitting there wondering whether your dream extension needs full permission, could fall under PD, or just needs that bit of paper to keep things official then know you’re not alone. These questions come up in nearly every first conversation I have. And honestly? Once you know the rules, the process gets a whole lot less intimidating.