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Do I Need Planning Permission for a single storey rear extension?

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Do I need planning permission for a single storey extension?

Whether you need planning permission for a single-storey extension depends on several factors, such as the location, size of the extension, and specific conditions set by your local council. Many single-storey extensions fall under permitted development rights, which allow certain types of work to be carried out without planning permission if they meet specific criteria.


Permitted Development Rights

Single-storey extensions can often be built without planning permission if they adhere to the following guidelines:

  1. The extension must not extend more than 3 metres from the original rear wall for attached houses or 4 metres for detached houses.  If the extension is larger (up to 6 metres for attached houses or 8 metres for detached houses), a prior approval application is necessary.
  2. The maximum height of the extension should not exceed 4 metres. The height of the eaves should not exceed the eaves of the existing house and must be no more than 3 metres if within 2 metres of the boundary.
  3. The extension should not be built forward of the principal elevation or a side elevation that faces a highway. It must be at least 2 metres away from the boundary if it exceeds 4 metres in height.
  4. The materials used must match the appearance of the existing house to ensure visual consistency.
  5. In special areas such as conservation areas, Article 4 designations, there are additional restrictions, and some permitted development rights might not apply.

If your planned extension does not comply with the above criteria, you will need to apply for planning permission. Common scenarios requiring planning permission include:

  • Exceeding the permitted size limits.
  • Using materials that differ significantly from the existing house.
  • Constructing in designated areas with additional restrictions.
  • Building an extension forward of the principal elevation or a side elevation facing a highway.

For further information on what is considered permitted development, please see here: https://www.4dplanning.com/what-is-permitted-development-

If you are unsure about the permitted development rights or require a second opinion or professional advice, 4D Planning are here to assist you. We can also assist you you’re your proposed extension, design and planning as well as building regulations for the extension project. Please give us a call or email us for a free consultation: enquiries@4dplanning.com

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