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Does My Extension Need Planning Permission?

Updated: Jan 22


Planning permission can be a thorn in the side of homeowners, developers and architects. If you fail to get approval for a project it can increase the timeframe and cost.


Fortunately, Asset Design and Build can help. We are one of the most experienced builders in Maidenhead, Harefield, Slough, Uxbridge, Windsor and surrounding areas, so clients get the right service every time.


Our main area of expertise is extensions. Whilst an extension can add substantial value to your property, you must make sure you gain the necessary planning permission for your project.


However, not every project will require planning permission. In some cases, the work will fall under permitted development, which means you can build your extension without the hassle of applying for planning permission.



When is an extension a permitted development?


If the design of your extension meets certain criteria you will not need planning permission. For example, it must not:


  • Cover more than half of the land around the house

  • Extend above the highest point of the roof

  • Be over four metres high if it is a single-storey extension

  • Extend too far beyond the rear wall of a property - three metres for an attached house and four metres for a detached

  • Be closer than seven metres to the rear boundary if it is a two-storey extension

  • Have materials that differ from those in the original building


The best place to find more information on permitted development rights is the Planning Portal. There is a section for extensions here: https://www.planningportal.co.uk/info/200130/common_projects/17/extensions.


Other planning permission considerations


The permitted development rights above and on the Planning Portal only apply to houses. The rules are different for flats and maisonettes.


There are also much stricter rules if you live on designated land, including conservation areas, national parks, and Areas of Outstanding Natural Beauty.


If your home is a listed building you also have fewer rights so will require permission for most projects.


Two of the most vital factors to consider with any extension are overlooking as well as overshadowing. Your project is more likely to get planning permission if it does not overlook or overshadow a neighbouring property. There are many ways you can design your extension to avoid both of these or minimise the severity.


Choose a reliable service


Asset Design and Build has a wealth of experience with planning permission for extensions and can adapt your design and gain planning approval for you if your project requires it. Get in touch with our team today and we can offer expert tips and advice on extensions and planning permission.

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