How does planning permission work for loft conversions?
While most loft conversions will fall under permitted development legislation, it will come as little surprise that the bigger the change to your property, the more likely it is to be subject to planning permission – especially if it involves altering the roof. It’s also worth emphasising, no matter what type of conversion you are undergoing, you will need to follow strict building regulations, to ensure everyone’s safety.
So what makes a bigger change? Where is the line between permitted development and planning permission?
When does a conversion not require planning permission?
Your architect or builder will be able to confirm whether you need planning permission, or you can check the limits and conditions outlined here, in Schedule 2, Part 1, Class B of the Town and Country Planning (General Permitted Development) (England) Order 2015.
Generally, a conversion falls under permitted development and doesn’t need planning permission if it meets these conditions:
- the space of the new loft will be less than 40 cubic metres in terraced houses, or 50 cubic metres for detached/semi detached houses.
- the plane of the roof slope extends to the same level.
- the extension is no higher than the existing roof
- it doesn’t include balconies, raised platforms or verandas
- the conversion uses materials which are similar in appearance to the rest of the property
- side-facing windows must be obscure-glazed; they must also be at least 1.7m above the ground
- where is your home? If it’s located in an Area of Natural Beauty, national park, conservation area or World Heritage Site then it is likely to fall under planning permission rather than permitted development.
- roof extensions (but not hip-to-gable extensions) must be set back 20cm from the original eaves; it also can’t overhang the outer wall of the original property
How does planning permission work for different properties?
The above conditions all apply to houses. Planning permission will be required for flats, maisonettes, converted houses and other non-dwelling buildings.
Planning permission is also required for houses created through the permitted development right to change use, as well as homes where there may be planning condition/restrictions that limit permitted development rights.
Where to apply for planning permission
Applying for planning permission for a loft conversion may be easier than you think, and if you’re based in England you can apply through the planning portal.
Find out more
If you’d like to find out more about permitted developments, you can find information from the government here. Or if you would prefer to have a conversation rather than read any more, please get in touch with us – we’d be happy to talk about permitted developments and planning permission and all of your loft conversion needs.
