This guidance reflects temporary increases to the size limits for single-storey rear extensions that must be completed by 30th May 2019, and the associated neighbour consultation scheme.
Adding a conservatory to your house is considered to be permitted development, not needing an application for planning permission, subject to the limits and conditions listed below.
* 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.
This scheme only applies to larger single-storey rear extensions which are permitted until 30 May 2019. This means that extensions of between four and eight metres for detached houses and between three and six metres for all other houses, must go through the process.
Notification of a Proposed Larger Home Extension
This template can be used by a householder to notify the local planning authority of the intention to build a larger single-storey rear extension as described above. Please read the guidance note for help completing the notification.
Please note: the permitted development allowances described here apply to houses not flats, maisonettes or other buildings. View guidance on flats and maisonettes here.
Access our interactive guide to the planning permission and permitted development regimes for conservatories.
Where work is proposed to a listed building, listed building consent may be required.
Please be aware that if your development is over 100 sqm, it may be liable for a charge under the Community Infrastructure Levy.
Permitted Development for householders – Technical Guidance
You are strongly advised to read a technical guidance document produced by the Government to help understand how permitted development rules might apply to your circumstances.
Building regulations will generally apply if you want to build an extension to your home.
However, conservatories are normally exempt from building regulations when:
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.
The following common work sections gives an indication of other elements normally required to satisfy the requirements of the Regulations for conservatories:
Whilst providing useful space, a badly designed conservatory can be a huge energy drain for the house as a whole.
The key to avoiding this is to separate the conservatory from the rest of the house, so that it can only be accessed via an external (insulated) door, so that it can then be closed off at night and on cold days.
If you want a sunspace that is integral to the rest of the house, it needs to be designed as an extension, with lots more insulation and energy efficient glazing in place.
This is an introductory guide and is not a definitive source of legal information. Read the full disclaimer here.
This guidance relates to the planning regime for England. Policy in Wales may differ. If in doubt contact your Local Planning Authority.