(⏱️ 3-minute read)
Thinking about extending your home? The good news is that many single-storey rear extensions can be built without applying for full Planning Permission — thanks to Permitted Development (PD) Rights. Here’s what you need to know before starting your project.
■ What Are Permitted Development Rights?
Permitted Development Rights allow homeowners to carry out certain types of extensions and alterations without submitting a full planning application. These rights are set by the UK Government to make home improvements faster and simpler — but there are strict limits you must follow.
■ Key Rules for Single-Storey Rear Extensions
You can generally build under Permitted Development if your extension: - Extends no more than 3 metres beyond the original rear wall of a terraced or semi-detached house, or 4 metres for a detached house. - Is no higher than 4 metres overall. - Doesn’t cover more than half the garden area. - Uses materials similar in appearance to the existing house. - Has eaves no higher than 3 metres if within 2 metres of a boundary.
■ Larger Extensions (Prior Approval Scheme)
If you want to extend further — up to 6 metres for semi-detached or 8 metres for detached homes — you can apply for Prior Approval. This is a simplified process where your council notifies neighbours and checks key factors like impact and size, but it’s still faster than full planning.
■ What Drawings Do You Need?
Even for permitted developments, professional drawings are essential to:
- Confirm your design meets PD limits
- Support a Lawful Development Certificate (recommended for peace of mind)
- Guide your builder accurately on site
You’ll typically need:
- Existing and proposed floor plans
- Existing and proposedeElevations
- Site and block plans
Our team can prepare all of these drawings — ready for submission to your local authority.
■■ Typical Timeline:
- Concept Design: 7–10 working days
- Planning Drawings for Lawful Development Certificate: 14 working days
- Building Regulations: 7–10 working days
■ Need Help with Drawings?
We offer Planning Drawing Packages from £200, including everything you need to confirm compliance and prepare for submission.
■ Explore our Planning Drawings Service: https://myextensionproject.co.uk/collections/our-packages
■ Summary
A single-storey rear extension is one of the most popular home improvements in the UK — and under Permitted Development Rights, you can often build without full planning permission. Just make sure your design meets the size and height limits, and always get accurate drawings prepared before you start.