Do I need planning permission?

Havi Architects
Mar 12
2 min read

Whether you need planning permission for your home extension depends on several factors, including the type of extension and any specific designations on your property, such as being in a conservation area or whether the building is listed.

Many home extensions in the UK fall under permitted development rights, meaning you can complete a small-scale project without formal planning permission. These permitted development rights come with clear limitations however, including restrictions on the size, height, and proximity to property boundaries and neighbours.

Under standard permitted development rules, you can extend a single-storey rear extension up to 3 metres for semi-detached and terraced houses, or up to 4 metres for detached houses. The prior approval scheme, also known as the 'larger home extension scheme,' permits even greater extensions - up to 6 metres for semi-detached and terraced houses, or 8 metres for detached houses.

However, these permitted development rights come with key conditions. Extensions must not exceed 4 metres in height, occupy more than 50% of your garden space, or encroach too closely on property boundaries. The materials used should also match or complement the existing house.

If your proposed extension falls outside of the permitted development rules, you will need to apply for formal planning permission. Working with an experienced architect can help streamline this application process and maximise your chances of approval.