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Permitted Development Rear Extension Restrictions 2023

Updated: May 16, 2023



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Permitted Development Restrictions 2023


This is a list of restrictions on development that are not permitted under Class A (Rear Extensions) of Part 3 of the Schedule. Development is restricted if:

  • It has been granted permission to use the dwelling house only by certain classes (F1G, M, N, P, or Q).

  • The total area of ground covered by buildings within the dwelling house's curtilage would exceed 50% of the total area of the curtilage.

  • The height of the part of the dwelling house being enlarged would exceed the height of the existing dwelling house.

  • The eaves of the part of the dwelling house being altered would exceed the height of the eaves of the existing dwelling house.

  • The enlarged part of the dwelling house would extend beyond a wall that forms the principal elevation of the original dwelling house or a wall that fronts a highway and forms a side elevation of the original dwelling house.

  • The enlarged part of the dwelling house would have a single storey, extend beyond the rear wall of the original dwelling house by more than 4 meters (detached) or 3 meters (other) in height, or exceed 4 meters in height.

  • The enlarged part of the dwelling house would have more than a single storey, extend beyond the rear wall of the original dwelling house by more than 3 meters, or be within 7 meters of any boundary of the curtilage.

  • The enlarged part of the dwelling house would be within 2 meters of the boundary of the curtilage and the height of the eaves would exceed 3 meters.

  • The enlarged part of the dwelling house would extend beyond a wall forming a side elevation of the original dwelling house and exceed 4 meters in height, have more than a single storey, or have a width greater than half the width of the original dwelling house.

  • The development would include the construction of a verandah, balcony, raised platform, installation of a microwave antenna, chimney, flue or soil and vent pipe, or an alteration to any part of the roof of the dwelling house.

If you are looking to undertake an extension, get in touch and we can bring you extension into life.



Let PermittedDevelopment.com take care of your extension.


We undertake a full measured survey of your existing house to enable us to plan your home reliably and cost effectively. We produce as existing drawings of your property which are required in your Lawful Development Certificate.


Your personal designer will undertake a detailed design brief with you where we will discover exactly what you are looking to achieve from your loft conversion. They will design concepts from your brief and create bespoke architectural drawings tailored to you.


We will provide you with the highest quality floor plans, elevations, and 3D views as seen in our videos. We will also provide rendered images that will give you a full understanding of the possible materials and finishes. You'll be able to see exactly what it will look like in real life before it is built!


You will then work with your personal designer to tailor the concepts and create your perfect design! ​ We understand that this process is difficult and decisions are hard. However, your personal designer will be there to help every step of the way and will draw recommendations from their architectural and local planning experience to make the design process seamless. ​Unlimited drawing revisions will enable you to create your perfect extension.


Once the design has been achieved, we will obtain a Lawful Development Certificate, or if it is required planning permission. You are now ready to build!


Legally, you must ensure that your project complies with building regulations which is a statutory requirement. ​ Our building regulation and structural drawings cover everything from the foundations all the way up to fire regulations, thermal efficiency, and even sound insulation. ​ We have vetted chartered structural engineers, building regulation specialists, party wall surveyors, drainage experts, land surveyors, and all other potential third party specialists that could be required in the signing off of your project. ​ This process will leave you in the best possible position going into the construction phase, providing your builder and your local authority's building inspector with everything they require.


We hope you are as excited to start your project today as we are! Please fill out our Contact Us form below so we can start your project as soon as possible. Or feel free to call us where you can speak to one of our specialists for any information you require.

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