Planning permission for extensions: Find out if you need consent for your project

Blockwork being built up for an extension on a semi detached house with a yellow cement mixer in the foreground
Planning permission for extensions isn't as simple as it making sure your design falls within permitted development as there are other factors that will need considering (Image credit: Getty)

Working out if you need planning permission for extensions is fundamentally about assessing whether permitted development rules apply. Permitted development allows certain works to be undertaken on your home without needing to seek planning permission first. 

There are other factors that need considering to be able to do this, including looking at whether you home is in a conservation area, if it is listed, or if the original house has already been extended. Some local authorities may have withdrawn permitted development rights in your area too, so you need to be on the lookout for that.

Simon Rix

Simon Rix is a professional planning consultant, who began his career working in local government in the 1990s. He was a council officer and later an elected councillor, so he knows how the planning system works from both sides. He went on to set up Planix.UK Planning Consultants Ltd; a consultancy company that advises self builders, home extenders and those taking on small to medium-sized building projects on planning permission.