Here at Kent Extensions, our team of expert builders specialise in delivering dream house extensions and conversions you’ve always wanted – to the highest standard. Our vast experience in completing exceptional extensions and conversions across the south east area, is highlighted by the many satisfied customers who have taken advantage of our reputable services. (References and portfolio are available).

Aswell as House Conversions, we also offer; Garage conversions, general joinery services, kitchen conversions, fitted kitchens, bathroom renovations and general building services – providing high quality results with every project that we complete. The broad and extensive range of services that we offer, allows us to continually meet our customers needs – which is our priority and has been for over 25 years.

Throughout our complete home extension service, we work closely with you at every stage of the project in order to deliver that much needed extra space you desire, whilst adding value onto your property. Assisting you with full architectural design, specification, planning and construction work – our friendly team will guide you along the way to discovering the ideal home extension you’ve always dreamt of, with minimal disruption and all for the best possible value for money. 

It’s true that many people who desire a home conversion for their property are put off by the whole process, due to the fact that they are unaware of what the first stage is. Maybe you are unsure whether or not you need planning permission or an architect? Or perhaps, you’re in the dark about how much a proposed project may cost and how long it will take? Kent Extensions take the confusion out of building a House conversion, by answering all these questions on your behalf. As we work closely with companies who can apply for planning permission and involve architects with the project, complete building applications and assist in delivering full project proposals and costs in writing, we therefore help you with all those questions you naturally have before you want to proceed.

Many people put off extensions because they do not know what the first stage is. Frequently asked questions tend to be:

  • Do I need planning permission? (See below for more information) 
  • Do I need an architect?
  • How long will the project take?
  • How much will it cost me?

Kent Extensions answer all of these questions on your behalf. We work closely with companies that can apply for planning permission on your behalf, get architects involved, complete building application work, provide you with a full cost and project plan in writing and help you with all your questions that naturally you will want to know before you proceed.


Not every project we undertake will require planning permission before it can be completed. If you’re interested in Kent Extensions adding a conversion to your property but unsure as to whether you need planning permission - it may or may not be required, subject to the following limits and conditions:

  • No more than half the area of land around the "original house"* would be covered by additions or other buildings.
  • No extension forward of the principal elevation or side elevation fronting a highway
  • No extension to be higher than the highest part of the roof.
  • Maximum depth of a single-storey rear extension of 3 metres for an attached house and 4 metres for a detached house.
  • Maximum height of a single storey rear extension of 4 metres.
  • Maximum depth of a rear extension of more than 1 storey of 3 metres including ground floor.
  • Maximum eaves height of an extension within 2 metres of a boundary of 3 metres.
  • Side extensions to be single storey with maximum height of 4 metres and width no more than half that of the original house.
  • 2 storey extensions no closer than 7 metres to the rear boundary.
  • Roof pitch of extensions higher than 1 storey to match existing house.
  • Materials to be similar in appearance to existing house.
  • No verandas, balconies or raised platforms.
  • Upper-floor, side facing windows to be obscure glazed; any opening to be 1.7 metres above the floor.
  • On designated land* no permitted development for rear extensions of more than 1 storey.
  • On designated land no cladding of the exterior.
  • On designated land no side extensions.

The term original house means the house as it was first built or as it stood on 1 July 1948 (if it was built before that date). Although you may not have built an extension to the house, a previous owner may have done so.

Click here to view more information from the Planning Portal.

Designated land includes national parks and the Broads, Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites.