Planning an extension? Use the interactive tool below to find out whether you can extend your house under permitted development or if you need to apply for planning permission*.

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*The information contained in this questionnaire is for general information purposes only. It should not be a substitute for planning advice tailored to your specific circumstances. For further information on planning permission which is tailored to your specific circumstances, we recommend you contact your local authority.

Single storey rear extensionDid you know you could be able to add an eight-metre rear extension to a detached house without planning permission? Photograph: Lu Jeffrey