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Permitted Development Side Extensions

Whether you are looking to achieve open-plan living, enlarge your kitchen, or just create a more spacious living area, then our permitted development specialists are here for you. 

​Permitted Development allows home owners to extend the side of their property, and in most instances, achieve exactly what they are looking for from their project without the need for planning permission.


The size of extension is set by the Government through their Permitted Development Technical Guidance and we specialise in optimising these regulations to deliver your perfect project. And even if we discover that your desired extension will exceed these regulations, then you've come to the right place as our specialists have extensive knowledge in small extensions too. 

Still have some questions surrounding your permitted development side extension? Our blog, dedicated to everything you need to know about permitted development, will answer them.

Our Simple Fixed Fee covers everything you require in your project 

Our tried and tested three-step process is proven to secure the success of your permitted development side extension.

Measured survey & existing architectural plans drawn up.

Meet your personal designer - who will draw your dreams to life

Unlimited design revisions to perfect your side extension. Utilising our expert planning knowledge, we will complete your application and work with your Local Planning Authority to secure your project's green light

Use the slider to check out this before and after example of a Permitted Development side extension! 

We can handle all your permitted development side extension needs!

If you’re thinking about having a side extension, then you’re probably going to need a Lawful Development Certificate. 90% of all side extension can be achieved through this route.

Lawful Development Certificate covers: 

For all property types other than terrace houses;​

  • Single storey.

  • Width of the extension up to half the width of the original property.

  • Maximum height of 4 metres.

  • Full length of the existing property. 

Permitted Development Side Extension Rules:

Permitted Development Class A Side Extensions are not permitted if;

  • As a result of the works, the total area of ground covered by buildings within the curtilage of the dwellinghouse (other than the original dwellinghouse) would exceed 50% of the total area of the curtilage (excluding the ground area of the original dwellinghouse.

  • The enlarged part of the dwellinghouse would extend beyond a wall which                                        (i)forms the principal elevation of the original dwellinghouse; or                                                            (ii)fronts a highway and forms a side elevation of the original dwellinghouse.

  • The enlarged part of the dwellinghouse would be within 2 metres of the boundary of the curtilage of the dwellinghouse, and the height of the eaves of the enlarged part would exceed 3 metres.

  • The enlarged part of the dwellinghouse would extend beyond a wall forming a side elevation of the original dwellinghouse, and would;                                                                                                    (i)exceed 4 metres in height.                                                                                                                      (ii)have more than a single storey, or                                                                                                        (iii)have a width greater than half the width of the original dwellinghouse.

  • It would consist of or include                                                                                                                  (i)the construction or provision of a verandah, balcony or raised platform,                                        (ii)the installation, alteration or replacement of a microwave antenna,                                                (iii)the installation, alteration or replacement of a chimney, flue or soil and vent pipe, or               (iv)an alteration to any part of the roof of the dwellinghouse.


Material Conditions:

  • the materials used in any exterior work (other than materials used in the construction of a conservatory) must be of a similar appearance to those used in the construction of the exterior of the existing dwellinghouse

Permitted Development Side Extension Government Guidance

Whilst we know the permitted development side extension guidance like the back of our hand, it can be useful for you to familiarise yourself with it, too

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02071 014730

02071 014730

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