A single storey extension can often be built under permitted development rights
Permitted development rights can offer a welcome shortcut through the planning system. They’re designed to let homeowners and developers carry out certain works without needing full planning permission from the Council.
If you’re working to a tight budget or need to avoid long delays, they can be a smart tool—if used correctly.
But there’s a catch. They don’t apply everywhere, and getting the details wrong can still land you in trouble with the Council. This blog explains how they work, where the limits are, and when it’s best to get professional advice.
The basics of permitted development
These rights are granted by national legislation. They allow some types of work—like modest extensions, loft conversions, or changes of use—to go ahead without a full application. You’re still expected to follow clear rules on size, location, materials and impact. And in many cases, you still need to notify the Council before starting work.
If your project meets the criteria, permitted development can be a fast and cost-effective route. It’s especially useful for improving a family home or converting certain types of buildings into new dwellings. But it’s not automatic. You need to check that your specific site qualifies, and whether any local restrictions apply.
When permitted development isn’t available
In areas where planning sensitivity is higher, the Council can limit or remove these rights altogether. Conservation areas, listed buildings and properties within designated landscapes often don’t benefit from permitted development in the usual way. If there’s something called an Article 4 Direction in place, your rights may be withdrawn entirely—even for minor changes.
Past alterations to a property can also affect what’s allowed. If previous owners have already used up the permitted thresholds, you may need to go down the full planning route. And if you’re working on a flat or maisonette, it’s worth noting that permitted development generally doesn’t apply at all.
How permitted development can support your project
When used correctly, these rights can make the difference between a smooth build and a drawn-out planning process. They reduce the paperwork, cut down on risk, and give more freedom for straightforward improvements. Whether you’re building a garden room, converting a barn or improving your main house, they’re often the most efficient way to move forward.
That said, there are still formal steps involved. For larger home extensions or changes of use, a prior approval application is often needed. This allows the Council to assess impacts like transport, noise or design before you begin. It’s not as involved as full planning, but it still requires care, timing, and the right supporting documents.
Common mistakes to avoid
One of the most frequent planning errors is assuming that permitted development rights apply automatically. They don’t. Each site is different, and relying on internet forums or someone else’s experience can quickly lead to trouble.
The most common issues include exceeding height or floor space limits, starting work before permission is confirmed, or misunderstanding what “prior approval” really means. All of these can lead to delays, rework, or formal enforcement if things go too far.
Even if you believe your project qualifies, it’s often worth applying for a Lawful Development Certificate. This isn’t always essential, but it gives formal confirmation that what you’re doing is within the rules. It also avoids problems down the line if you want to sell or refinance the property.
When a full application might be better
In some cases, trying to squeeze your project into the limits of permitted development just doesn’t make sense. If your design is ambitious, if you want more flexibility on layout, or if you’re planning something with a visible impact, it might be wiser to submit a full planning application instead.
This can allow for more creative freedom and reduce the risk of being caught out by a technicality. It also gives you a clearer route to engage with the Council and your neighbours from the start. We often advise clients to weigh both routes before deciding how to proceed.
Get clarity before you commit
We regularly help people who want to make the most of permitted development but aren’t sure where to start. If you’re in doubt, the safest option is to get clear, structured advice at the outset. That way, you avoid assumptions, reduce risk, and stay on the right side of the rules.
At Norton Taylor Nunn, we support homeowners, landowners and developers across the East of England, Home Counties, London and the South East. Whether you’re just exploring your options or need help submitting a Prior Approval or Certificate of Lawfulness, we’ll guide you through each step—clearly and confidently.
If you’d like to speak with us about your project, get in touch here. Or head over to our blog section to learn more about the planning system.
Planning doesn’t have to be complicated. Let’s find the simplest path to your next big win.
