What Is Permitted Development?

Permitted development is a great way to maximize the potential of your home without having to go through full planning.

The beauty of permitted development is that the government has allowed extensions and enlargements to properties without the need to make a Full Planning Application. Every house has Permitted Development Rights unless they have been removed.

When extending your home under the Permitted Development rules it is advised to obtain a Lawful Development Certificate. This will eliminate the query of the extension being permitted. Also, when selling the property the process will be smoother as you can confirm the works are approved. To obtain the certificate an application will be made to the council, we will provide existing / proposed architectural drawings and complete the relevant forms. The council usually take 8 weeks to issue the Lawful Development Certificate.

Permitted Development rules changes in October 2008, originally the permitted development rules took into account the total volume increase. Now, there are only rules on the volume allowed to increase your existing roof, extensions are covered by separate rules.

Unfortunately, flats and properties in conservation areas do not have Permitted Development Rights.

The various Permitted Development rules are split between classes:

Class A – Changes to a house without planning permission
Class B – Extension to roofs
Class C – Alterations to roofs and roof lights
Class D – Erection of a Porch
Class E – Covers building around the house (Outbuildings)
Class F – Hardstandings
Class G – Chimney, flues or soil and vent pipes
Class H – Satellite Dishes and Antennas

Request Quote

Permitted Development Rules

  • Loft conversions are NOT permitted development for houses on the designated land.
  • To be permitted development any additional roof space created must not exceed these volume allowances:
    -40 cubic metres for terraced houses.
    -50 cubic metres for detached and semi-detached houses. 
Bear in mind that any previous roof space additions must be included within this volume allowance. Although you may not have created additional space a previous owner may have done so.
  • An extension beyond the plane of the existing roof slope of the principal elevation that fronts a highway is NOT permitted development.
  • Materials to be similar in appearance to the existing house.
  • No part of the extension to be higher than the highest part of the existing roof.
  • Verandas, balconies or raised platforms are NOT permitted development.
  • Any side-facing windows must be obscure- glazed and non-opening unless the parts which can be opened are more than 1.7 metres above the floor of the room in which it is installed.
  • Roof extensions, apart from hip to gable ones, to be set back, as far as is practicable, at least 20cm from the original eaves. The 20cm distance is measured along the roof plane. 
The roof enlargement cannot overhang the outer face of the wall of the original house.
  • Extensions (including previous extensions) and other buildings must not exceed 50% of the total area of land around the original house.
  • Extensions forward of the principal elevation or side elevation of a house and fronting a highway are NOT permitted development.
  • On designated land side extensions are not permitted development.
  • Materials used in exterior work to be similar in appearance to those of the exterior of the existing house. This condition does not apply when the extension is a conservatory.
  • The width of side extension must not have a width greater than half the width of the original house.
  • Side extensions to be a single storey with a maximum height of four metres.
  • If the extension is within two metres of a boundary maximum eaves height should be no higher than three metres to be permitted development.
  • Single storey rear extension must not
 extend beyond the rear of the original house by more than 3m an attached house or by 4m if a detached house. 
In addition, outside designated land and Sites of Special Scientific Interest, the limit is increased to 6m if an attached house and 8m if a detached house until 30 May 2016. 
These increased limits (between 3m and 6m and between 4m and 8m respectively) are subject to the neighbour consultation scheme.
  • Single storey rear extension must not exceed a height of four metres.
  • Maximum eaves and ridge height of extension no higher than existing house.
  • On designated land extensions of more than one storey are not permitted development.
  • Extensions (including previous extensions) and other buildings must not exceed 50% of the total area of land around the original house.
  • Maximum eaves and ridge height of extension no higher than existing house. If the extension is within two metres of a boundary maximum eaves height should be no higher than three metres to be permitted development.
  • Extensions of more than one storey must not extend beyond the rear wall of the original house by more than three metres or be within seven metres of any boundary opposite the rear wall of the house.
  • Roof pitch of extensions higher than one storey to match that of the existing house, as far as is practicable.
  • Materials used in exterior work to be similar in appearance to those of the exterior of the existing house.
  • Any upper-floor window in a wall or roof slope in a side elevation must be obscure- glazed and non-opening unless the parts which can be opened are more than 1.7 metres above the floor of the room in which it is installed.
  • No balconies or verandas are permitted development.
  • On designated land outbuildings to the side of the house are not permitted development.
  • Outbuildings are not permitted development within the grounds of a listed building.
  • Outbuildings are not permitted development forward of the principal elevation of the original house.
  • Outbuildings and other additions must not exceed 50% of the total area of land around the original house. Sheds and all other outbuildings and extensions to the original house must be included when calculating this 50% limit.
  • To be permitted development, any new building must not itself be separate, self-contained, living accommodation and must not have a microwave antenna.
  • Outbuildings must be single storey with a maximum eaves height of 2.5 metres and maximum overall height of 4 metres with a dual pitched roof, or 3 metres in any other case.
  • If the outbuilding is within 2 metres of the property boundary the whole building should not exceed 2.5 metres in height.
  • Balconies and verandas are not permitted development. Raised platforms such as decking are permitted development provided they are no higher than 300mm.
  • Ground area of the porch, measured externally, not to exceed three square metres.
  • The highest part of the porch not to exceed three metres.
  • No part of the porch to be within two metres of any boundary that fronts a highway.

Maximise Your Space

Permitted development is a great way to maximize the potential of the space within your home without having to go through full planning permission process.

What Class Does You ‘Fit’?

Permitted Development rules are split into various classes depending on what type of development you wish to pursue. Eliminate the guess work and contact Detailed Planning today.

Our Projects

We have undertaken a vast number of projects under permitted development in London. Browse through our home projects to view some previous projects we have completed.

Why Choose Us?

  • Hundreds of previous permitted development projects completed
  • Experienced team dedicated to your project
  • Affordable fixed rates
  • Great knowledge in all aspects of the technicalities and rules involved
  • Free quotes and consultation

What Our Clients Say?

“Over all my experience with Detailed planning was a pleasure, very professional and patient. Took the time to explain the steps needed to apply for planning and the correct way to do it, I would fully recommend their services.”

Lyle, Customer In London
REQUEST QUOTE

Need Help With Permitted Development?

And feel free to pop into one of our offices closest to you. We are more than happy to help!
REQUEST QUOTE