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Larger Home Extension Scheme

Make the most of the Larger Home Extension Scheme


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Last updated Tuesday 6th October 2020

Top down or ground up   what s the best order to build

If you’re planning on building a single storey rear extension under your permitted development rights, you can now take advantage of a doubled size allowance under the Larger Home Extension Scheme. This includes extensions up to 8 metres (from 4 metres) for a detached house, and 6 metres (from 3 metres) for all other houses.

Previously, this scheme only applied to projects completed before the end of May 2019. This scheme has now been made permanent.

Does my single storey rear extension qualify?

To take advantage of this extra allowance under permitted development, you’ll need to ensure your plans extend no more than 8 metres (for a detached property) or 6 metres (for all other properties) from the rear elevation of the original house, as it stood on 1 July 1948.

Even if you haven’t built a rear extension yourself, your permitted development rights may have already been used up if a previous owner added to the property. If you think this might be the case, book a free consultation call with our friendly architects, who can check on your behalf.

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Two storey

Two Storey





The development must also comply with other conditions that apply to all rear extensions allowed under permitted development. These include:

  • No more than half the area of land around the original house (as it stood on 1 July 1948) should be covered by buildings.
  • The maximum height of the extension is 4 metres, as measured from the highest point of natural surface ground. The maximum height reduces to 3 metres if the extension is within 2 metres of a boundary.
  • Construction materials must be similar in appearance to those used for the existing house. No balconies, verandas, raised platforms or chimneys are included.
  • As with any other kind of permitted development, this scheme does not apply to homes in conservation areas, flats or maisonettes.

Rear extension

Prior approval

Although the Larger Home Extension scheme falls under your permitted development rights, you won’t be free and clear of your local authority.

Under the new planning rules, introduced in 2020, you will need to obtain prior approval before you can think about building your dream extension. This was formerly known as the ‘neighbourhood consultation scheme’.

Prior approval allows your local authority to assess whether your designs meet the strict guidelines and measure your project’s impact on the surrounding area, such as nearby transport and highways. It typically takes 8 weeks for them to review your project, and requires a fee of £334 per new dwelling house.

How can Resi help?

Now, unless you’re very familiar with UK planning policy, the ins and outs of this scheme can feel a little daunting. Especially when you think about the potential penalties you might face, should you end with plans that fall outside of the guidleines.

That’s why it pays to have an architect by your side. Our team can not only assess whether or not your home is suitable for the scheme, they’ll handle your whole planning application. Ensuring every rule is followed, and you have the best possible chance of first time approval.

Fancy learning more? Book a free consultation today. Our experts are always on hand to offer free home advice, covering everything from design ideas to any questions you might have about the larger home extension scheme. Did we mention this service is free?

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