London’s Leading Home Extension Specialist


From a brand new open plan kitchen and dining room, to extra bedrooms and bathrooms, Simply Extend is here to help you plan your extension.  There are many different types and sizes of extensions to choose from as well as glazing options including velux windows and bi-folding doors.  Click here for more ideas on glazing options or visit our online gallery for inspiration on planning and designing your own extension.  All photos are taken from Simply Extend projects so you will be able to see our level of workmanship and attention to detail.

When it comes to planning your extension, our all in one package means that if required, one of our architects will visit your home to complete a survey and produce a set of plans according to your wishes and feasibility of the space available.  Simply Extend can also help with structural calculations and dealing with building control as well as submitting your plans under permitted development or full planning.

Will my extension require planning permission?

Not all extensions require planning permission and most often can be carried out under permitted development as long as it fits into the following criteria:

  • A single storey rear extension must not extend beyond the rear wall of the original house by more than three metres for an attached house and four metres for a detached house.  This has more recently been increased to six metres and 8 metres respectively until the end of May 2016 under certain criteria.
  • The maximum height of a single storey extension is four metres
  • An extension of more than one floor must not extend beyond the original rear wall of the house by more than three metres

To see the full list of permitted development criteria, visit the UK planning portal by clicking here.

If you wish to get your project started then book a free no obligation site survey by calling 0800 917 7571 or by completing out our online enquiry form.

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Give us a call on 0800 917 7571 (we are open until 8pm weekdays)

Or fill out an online enquiry form. Our friendly and helpful advisors will arrange a free, no obligation site survey of your home and get the ball rolling.