Side extension planning permission – our quick guide

If you’re planning to extend your home, you may have heard about the recent legislation change regarding planning permission requirements. Permitted development rights were scheduled to end on 30th May 2019. The government have now decided to make this legislation permanent, allowing homeowners more scope to extend their home.

Home extensions – what guidelines must you follow?


Under the new, permanent legislation, a home extension or conservatory is deemed to be permitted development, which will not require a planning permission application. Permitted development, however, is subject to various conditions relating to the size and structure of the planned extension. According to the government’s Planning Portal, for an extension to be considered permitted development and not need planning permission acceptance, it must:

  • Not cover more than half the land surrounding the original property
  • Not extend from the front of the building or the side of the building (if the side elevation faces a main road)
  • Not be higher than the highest part of the existing roof
  • Not extend more than eight metres from the rear wall of the original property (detached) and six metres (semi-detached, terraced)
  • Not exceed four metres in height (single storey rear extensions)
  • Not exceed four metres in height and not exceed more than half the width of the original property (side extensions)

These are the main guidelines to follow when planning to extend your home. For more detailed information visit


Side extensions – the essential information

For the majority of homeowners, extending from the rear of your property is usually the preferred option. For some people, however, it will make more sense to build a side extension. Side extensions face stricter regulations than rear extensions. If you’re planning a side extension, you may need to refer to the Neighbour Consultation Scheme depending on the impact your extension may have on their home life.

If you want to extend your home from the side, there are certain criteria which you must adhere to. As mentioned above, side extensions must not exceed four metres in height and be bigger than half the width of the original building. Side extensions can only be single storey under permitted development rights. If you live in a conservation area or your property is on designated land, no side extensions are allowed without planning permission.

Home extensions across the south of England

By making permitted development a permanent legislation, the government have made it easier for homeowners to extend their homes. There are still lots of things to consider when extending your home including choosing the right type of extension to suit your requirements and working with a fully accredited installation company.

If you live in the south of England anywhere along the M4 corridor from Bristol to the M25 and everywhere in between, and you’re planning to extend your home, Oakley Green are the company to call. We have a wealth of experience with home extensions and conversions and have helped homeowners from Newbury to Swindon and Oxford to Basingstoke to realise their dream home improvements. For more information about working with Oakley Green call 01635 877 959 or contact us online.