If you’re thinking about house extensions in London, one of the first questions that comes up is: “Do I need planning permission?” The answer — as with many things in this city — is: it depends.
At XMX London, we’ve guided dozens of clients through the process of extending their homes. From modest rear extensions to full wraparound projects, we know that understanding the planning rules early can save you time, money, and a lot of unnecessary stress.
- When You Don’t Need Planning Permission
Believe it or not, some extensions don’t need full-blown planning approval. Thanks to something called permitted development rights, you can sometimes crack on without going through the council — as long as what you’re doing ticks the right boxes.
Take a single-storey rear extension, for example — if it’s not too high or deep, it might be allowed without permission. But here’s the catch: it all depends on the type of house you’ve got, whether you’ve extended before, and where you live. If you’re in a conservation area or your home’s listed, it’s a different story.
- When You Do Need It
If the extension you’re planning goes beyond what’s normally allowed — maybe it’s taller than usual, comes out too far, or faces the street — then yeah, you’ll need to get proper planning permission.
Same goes for things like double-storey builds or anything more ambitious at the front of the house. Some boroughs can be stricter than others too, so it’s best not to assume — a quick check with someone who knows the local rules can save you a lot of time later.
- Why It’s Worth Doing Things Properly
Some homeowners are tempted to skip planning and ‘hope for the best’. We strongly advise against this. Not only can the council order you to reverse the work, but it can also cause issues when selling your home later.
A properly approved extension adds value to your home and gives you peace of mind that everything’s above board.
- Getting Help from the Start
At XMX London, we don’t expect you to navigate all of this on your own. Before any work begins, we’ll help assess your situation, advise whether planning permission is required, and even assist with submitting applications if needed.
Getting a house extension can really change how you live — but only if it’s done properly. And the first step? A house extension can make a big difference — but only if the groundwork’s done right. And that means knowing what the council’s likely to say yes or no to.
Got something in mind but not sure where you stand? Drop us a line. We’ll talk it through, straight up — no fuss, no jargon, no pressure.
👉 Visit: https://xmxlondon.co.uk to speak to the experts in London house extensions and planning.
