Quick Answer
Planning permission is one of the most misunderstood parts of building work in the UK. Many homeowners either skip it when they need it or assume they need it when they do not.Permitted Development RightsMany common projects do not need planning permission: single-storey rear ext...
Key Information
- Last Updated:
- 3 Sep 2026
- Category:
- Building Advice
- Reading Time:
- 1 min read
Planning permission is one of the most misunderstood parts of building work in the UK. Many homeowners either skip it when they need it or assume they need it when they do not.
Permitted Development Rights
Many common projects do not need planning permission: single-storey rear extensions up to 6m (detached) or 4m (semi/terraced), loft conversions with rear dormers, porches under 3m², and garage conversions.
When You DO Need Permission
You need full planning permission for: two-storey extensions, side extensions near a highway, work exceeding PD limits, change of use, and new builds.
Building Regulations vs Planning
These are completely separate systems. Building regulations control safety and energy standards. Planning controls what you can build, where, and how it looks.
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Interesting piece on planning permission. Just to clarify though, I'm confused about when exactly you need full permission for extensions - is it solely based on size?
Hi there! Just wondering, do you need planning permission for adding velux windows to your loft? I've heard they count as rear dormers but wasn't sure. Cheers!
I'd add that for loft conversions with rear dormers, maintaining a distance of at least 7 metres from your property's boundary helps avoid needing planning permission.
Interesting point on permitted development rights. Just to add, for those considering loft conversions, remember to check if your property is in a conservation area, as these rules don't apply.
I'm still unsure about whether I need planning permission for my two-storey extension. The limit seems clear for single-storey extensions, but could you clarify how height is measured for a two-storey one? Thanks for your help!
I'm still unclear on how 'change of use' is defined. Could you provide some examples to better understand when I might need permission?
While I appreciate the general guidance on permitted development rights, could you clarify how these apply to properties in conservation areas? Thanks!
I've got a loft with plenty of space for a conversion. Do I still need to worry about planning permission?
I appreciate the clarity on permitted developments, but could you elaborate more on what constitutes a 'near' highway for side extensions? I'd hate to assume and later find out it doesn't apply.
Interesting read, but I'm still confused about when exactly I'd need full planning permission for extensions. Could someone clarify with examples?
I've been wondering about converting my garage into a gym. Do I need planning permission for that? 💪
Just started planning my loft conversion - is it true I don't need permission for dormers at the back?
Just to add, while porches under 3m² are PD, they must be at least one metre away from any boundary. Always double-check boundary conditions!
I was surprised to learn about the limits on single-storey extensions in my area of Manchester. Planning permission is clearly more complex than I thought!
Useful guide for planning extensions in Yorkshire. Just learned I don't need permission for my loft conversion, but will need it for my two-storey extension.
I've just started planning my loft conversion, but I'm confused about what I need permission for. Do porches really only need it if they're over 3m²?
Just to clarify, for two-storey extensions, permission is needed if it's over 3m high or if it extends beyond the rear wall by more than 3m.
Just had my extension plans approved! I didn't realise you could extend 6m without permission. Thanks for the clear guide!
Don't forget, even if you're within permitted development rights for your extension's size, you'll still need to comply with building regulations regarding standards like fire safety and accessibility.
Just to add, for those considering a garage conversion, ensure your new room meets Building Regs for soundproofing & ventilation - essential for converting spaces that weren't originally habitable.
Just a heads-up, even if your extension's under permitted development, you'll still need to comply with building regulations for energy efficiency. Consider using insulated concrete formwork (ICF) for a robust, eco-friendly structure.
Just a heads-up for those considering loft conversions. If your property is in a conservation area or listed, PD rights may be restricted. Always check first!