The Ultimate Guide to Building a Rear Extension Without Planning Permission
Adding extra space to your home is a great way to increase both comfort and property value. The good news? Many homeowners can build a rear extension without needing to apply for planning permission—thanks to something called permitted development rights. In this guide, we’ll explain how rear extensions can qualify, what the rules are, and how Exeter Building Solutions can help you make it happen.
What Is a Rear Extension?
A rear extension is a single- or double-storey addition built onto the back of your home. It’s a popular choice for open-plan kitchen diners, extended living rooms, or even home offices. When done right, a rear extension can transform your lifestyle—without the hassle of moving.
Do I Need Planning Permission?
Not necessarily. Under the UK’s permitted development rights, you may be able to build a rear extension without formal planning permission, provided it meets certain conditions. These rules apply to many houses (but not flats, maisonettes, or homes in protected areas like National Parks or conservation zones).
Key Rules for Permitted Development Rear Extensions
Here are the main limitations your rear extension must stay within to avoid needing planning permission:
✅ For Single-Storey Rear Extensions:
- Depth: Up to 3 metres for a terraced or semi-detached house, and up to 4 metres for a detached house.
- Height: Must not exceed 4 metres in total.
- Eaves Height: Must not be higher than 3 metres if within 2 metres of a boundary.
- Materials: Must be similar in appearance to the existing house.
- Width: Must not extend beyond the side wall of the original house.
✅ For Larger Single-Storey Extensions (up to 6m/8m):
You may be able to extend further (up to 6m for semis/terraces and 8m for detached homes) under the Neighbour Consultation Scheme—a type of prior approval that is quicker than full planning permission.
✅ For Double-Storey Rear Extensions:
- Depth is limited to 3 metres from the original rear wall.
- The extension must not be closer than 7 metres to the rear boundary.
- Roof pitch should match the existing house as far as possible.
Additional Considerations
- Building Regulations: Even if planning permission isn’t needed, your extension will still need to comply with building regulations.
- Previous Extensions: If your home has already been extended, the permitted development allowance may be reduced.
- Listed Buildings or Protected Land: These properties are excluded from permitted development rights—planning permission will be required.
Why Work With Exeter Building Solutions?
At Exeter Building Solutions, we specialise in stress-free home extensions. We handle everything from design and compliance checks to project management and build. If you’re unsure whether your extension qualifies under permitted development, our team can guide you through every step and ensure your build is fully compliant.
Ready to Extend Without the Hassle?
Whether you want a spacious kitchen diner or more room for the family, a rear extension can be the perfect solution—without the red tape. Contact Exeter Building Solutions today for a free consultation and start planning your dream extension.
Need expert advice? Get in touch with Exeter Building Solutions for a no-obligation site visit and tailored quote.