How much are you allowed to extend your house?

If you are looking to extend your home, it is important to ensure you know how much you are allowed to extend and the constraints and regulations around home extensions.

Since 2015 it is possible to extend your home in some situations without planning permission using permitted development rights. However, there are constraints. Let’s look at some of them here to see how much you can extend your home. Listed below are the reasons you may not need to obtain planning permission for your extension.

Permitted Development Rights

  • Your planned extension is within 2 metres of your property boundary and the height at the eves is less than 3 metres. 
  • The extension covers less than 50% if the area of land around your home. 
  • The extension is shorter than the highest part of the current roof and lower at the eaves than the current eaves. 
  • The materials used for your extension should be like the materials of your current house materials. 
  • The extension doesn’t include a raised platform, veranda, balcony, chimney, tv ariel or dish. 

Let’s look at the different types of extension and how far you can extend with each. 

Single story extension

Extensions to the rear of a property have the least restrictions and you should be able to build an extension of up to four metres for a detached house and 3 metres for any other type of house that is single story with no planning permission. 

If you do not live in a conservation area, then the limit for single story extensions to the rear of a property for a detached house can be extended to 8 metres and to 6 metres for other property types. 

You will need to notify the council of the larger extensions who will consult your neighbours to ensure they do not object.

Single story side extensions

Side extensions that are single story can be added to your property if they do not exceed 4 metres in height or half the width of the original house. 

Multi -storey extensions

You can sometimes build a multi-story extension with no planning permission as long as:

  • The extension does not extend past the rear of the house over 3 metres.
  • The extension must not be within 7 metres of a boundary opposite the rear of the house.
  • The roof must patch the current house roof as near as possible.
  • If there is a side window this must be obscure glazed. 

You are more likely to need permission to build a multi-story extension. 

If you would like more information on how much you are allowed to extend your house speak to one of our experts today and we will be happy to discuss this with you.

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