Extensions must not go forward of the building line of the original dwelling.Any new extension must be built in the same or similar material to the existing dwelling.Side extensions can only be single storey with a maximum height of 4m and a width no more than half of the original building.Two-storey extensions must not be closer than 7m to the rear boundary.A single-storey extension can’t be higher than 4m on the ridge and the eaves, and ridge heights of any extension can’t be higher than the existing property.You can extend a detached property by 8m to the rear if it’s a single-storey extension (6m for a semi or terraced house), or by 3m if it’s double.

(Image credit: Adam Scott ) What Size Extension Can I Build Without Planning Permission? The depth you extend to the rear depends on the type of house you have. Under PD rights you can build an extension without planning permission as long as you meet certain criteria. If you want to extend your home then your project might well fall under PD rights. Do I Need Planning Permission for an Extension? Larger build projects, such as where you self build, demolish and replace an existing building or create a large extension, will generally be subject to planning permission. That means if your home has already been extended, for example, it's Permitted Development rights have already been allocated if you wanted to undertake a similar project in the future. Your property also has a limit to its Permitted Development rights, which don't reset when it changes ownership. In these instances, PD rights often don't apply. That's because in some areas, Permitted Development rights have been revoked, such as the ability to undertake a garage conversion under PD rights where on-road parking is an issue.Īnother example is if you live in a designated area, such as a Conservation Area, or own a listed building. With the help of this guide, you'll soon get to know exactly what can be done under Permitted Development, but while this is an implied consent for your project, it's always worth checking with your local authority. Join today for access to easy-to-read guides which will provide you with key information to help you secure planning permission. The Planning Hub is a new online resource that will help you understand how to get to grips with complex planning rules.

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