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Permitted Development ‘PD’

Could Your Extension or Remodel be Permitted Development ‘PD’

Does Permitted Development ‘PD’ apply to your extension?

Planning & Building Regulations

Permitted Development in England and Wales.Whether you need Planning Permission or Building Regs, approval can be very confusing when planning your new extension. Below we have provided some useful information to guide you through. However if in any doubt then WE or your local building control office can confirm any details that may not be covered or specific to your area.

Planning Permission and Permitted Development in England & Wales

Under new regulations that came into effect from 1 October 2008 adding an extension to your house can be considered to be permitted development, ie not needing an application for planning permission, subject to the limits and conditions listed below.

  • 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.
  • Single-storey rear extension must not extend beyond the rear wall of the ‘original house’* by more than three metres if an attached house or by four metres if a detached house.
  • Maximum height of a single-storey rear extension of four metres.
  • Maximum depth of a rear extension of more than one storey of three metres from the rear wall of the ‘original house’* including ground floor.
  • Maximum eaves height of an extension within two metres of the boundary of three metres.
  • Maximum eaves and ridge height of extension no higher than existing house.
  • Side extensions to be single storey with maximum height of four metres and width no more than half that of the original house.
  • Roof pitch of extensions higher than one storey to match existing house.
  • No verandas, balconies or raised platforms.
  • On designated land* no permitted development for rear extensions of more than one storey; no cladding of the exterior; no side extensions.

Please note: the permitted development allowances described here apply to houses not flats, maisonettes or other buildings.

Where work is proposed to a listed building, listed building consent may be required.

*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.

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

More Resources for Permitted Development Information

This link to the Planning Portal website provides access to various interactive guides.
Planning Portal’s Permitted Development Page:

Planning Permission Scotland
In Scotland you will require a building warrant before commencing any work even if planning permission is not required. You will find some helpful resources by following these links:

Scottish Borders Council
The Scottish Government Website
Planning Procedure in Scotland

Building Regulations
All extensions require Building regulation permission of some sort. We are able to help you out with this. We can draft the required plans and write the specifications to enable the work to comply with this government legislation which is enforceable by Law.  This makes getting your extension easy, permitted development or not.

However, conservatories are normally exempt from building regulations when:

  1. They are built at ground level and are less than 30 square metres in floor area
  2. At least half of the new wall and three quarters of the roof is either glazed or translucent material
  3. The conservatory is separated from the house by external quality doors, windows & walls
  4. Glazing and any fixed electrical installations comply with the applicable building regulations requirements (i.e. Part N – ‘Glazing and Part P – ‘Electrical Safety’).

You are advised not to construct conservatories where they will restrict ladder access to windows serving rooms in roof or loft conversions, particularly if any of the windows are intended to help escape or rescue if there is a fire.

Any new structural opening between the conservatory and the existing house will require building regulations approval, even if the conservatory itself is an exempt structure.

IMPORTANT: Future Proposed Changes to Building Regulations in England & Wales
There is a proposed intention to include conservatories under building regulations by October 2010 and you should bear this in mind if you are planning to add a conservatory in the near future.

The proposed revision to document L of the Building Regulations being considered by Government will require higher insulation values for conservatories, and compliance will need to be certified by the installer or local authority once the project is completed. In the same way that replacement double glazing in your home has required compliance with document L via Local Building Authority or a competent persons scheme such as Fensa or Certass.

The proposed revision also states that the area of transparent or translucent material in the external envelope must be more than 150% of the floor area.

3m x 3m Conservatory
Floor Area = 9m²
Glazed area of Conservatory must be at least 13.5m²

With this in mind then careful consideration must be giving as to the design of your new DIY Conservatory, which we can guide you though.

Please note. All the information provided above regarding Planning or Building Regs applies to England and Wales only. Scotland, Northern Ireland and Eire will differ and we advise that you contact your local Building control dept and discuss your proposed project before any work is carried out.  If you have additional questions on regulations or permitted development, contact us directly.

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