Many homeowners in the UK dream of a spacious extension, especially if their family is outgrowing their home. But when you start to think about planning permission and the red tape involved, it’s enough to make you forget about those dreams.  But did you know that house extensions are possible without planning permission? This guide will show you the type and size of extension you can build without planning permission. 

The Larger Home Extension Scheme

Back in 2013, the government introduced the Larger Home Extension Scheme. This meant that under permitted development, single-storey extensions could be built without the need for planning permission.  These relaxed rules were made permanent in June 2019, meaning homeowners can extend their properties as long as they follow the outlined regulations. 

What size extension can I build without planning permission?

Only single-storey extensions and conservatories are covered by permitted development. If you’re thinking about getting a two-storey extension, you’ll need to file for planning permission However, for single-storey add-ones, there are some rules you need to follow:
  • For attached properties, the extension cannot extend beyond the rear wall of the original home by more than three metres. 
  • For detached properties, the extension cannot extend beyond the rear wall of the original holme by more than four metres. 
  • Any roofs or ridges cannot exceed the height of the original house. Eaves cannot exceed two metres in height.
  • The extension cannot exceed four metres in height. 
  • The extension cannot be more than half the original size of the house. 
  • Side or front extensions cannot be closer to public highways than the original property. 
With the Neighbourhood Consultation Scheme, you’ll be able to extend up to six metres (eight metres for detached homes) beyond the property wall as long as your neighbours approve. Your next-door neighbours will have 21 days to object to the extension before you can move forward. 

Homes in conservation areas

If your home is within a conservation area, you are covered by permitted development, as long as you abide by the rules above. You will also need to follow the Neighbourhood Consultation Scheme, which gives your neighbours a chance to file objections to your extension if they think their property will be impacted. Your extension must also not be clad in stone, pebbledash, render, timber, plastic or tiles.  If you are lucky enough to live in a listed property, you’ll need planning permission for any size extension, and your property is not covered by permitted development.

Does your extension need planning permission?

If you’re unsure whether you’ll need planning permission for your extension plans, we can help. With years of experience designing and building extensions in Northamptonshire, we know exactly what falls under permitted planning.  If you’d like an extension but don’t want to deal with planning applications, we can show you what’s possible for your home under permitted development. Call us today to arrange a free consultation with a member of our team.