The following information has been provided by local planning office and provides detail of the relaxed permitted development rules brought in by David Cameron to get Britain back building.
They have recently been extended from may 2016 to may 2019.
This provides valuable information about extending your home.
Department for Communities and Local Government
Permitted development for householders Technical Guidance April 2014
This technical guidance was commissioned and written under the last
Government, and updated in April 2014
Permitted development rights allow householders to improve and extend their homes
without the need to seek a specific planning permission where that would be out of
proportion with the impact of works carried out. It is important that homeowners
understand how they can exercise their rights to carry out development while
protecting the interests their neighbours and the wider environment. The
Department for Communities and Local Government has produced this technical
guidance to help them. It is designed to be used by anyone who wants to
understand more about the detailed rules on permitted development and the terms
used in those rules. However, anyone who has no previous knowledge of permitted
development issues will find it useful to look at the basic information on the Planning Portal first at:
The guidance set out below was updated in January 2013 to clarify the position on solid wall insulation (see page 13), in October 2013 to reflect the time-limitedchanges to the size limits for rear extensions and the introduction of a neighbour consultation scheme for those larger extensions, both of which came into force in May 2013 (see page 17) and in April 2014 to clarify the position regarding the
measurement of eaves in relation to the enlargement of a roof (see page 34). It
gives an explanation of the rules on permitted development for householders, what
these mean and how they should be applied in particular sets of circumstances.
Diagrams have been included for illustrative purposes only and these are not drawn
to scale. Given the very substantial variations in the design of individual houses,
this guide cannot cover all possible situations that may arise. Where there is any
doubt as to whether a development would be permitted development, advice should
be sought from the local planning authority. To be certain that a proposed
development is lawful and does not require an application for planning permission, it
is possible to apply for a “Lawful Development Certificate” from the local authority.
Further information on this can be found on the Planning Portal at:
Householder permitted development rights are set out in Town and Country Planning(General Permitted Development) Order 1995 (“the 1995 Order”) and amended by the by the Town and Country Planning (General Permitted Development)(Amendment) (No.2) (England) Order 2008 the Town and Country Planning (General Permitted Development) (Amendment) (England) Order 2013 Town and Country Planning (General Permitted Development) (Amendment and Consequential Provisions) (England) Order 2014
Part 1 of Schedule 2 to the 1995 Order (as amended in 2008, 2013 and 2014) sets out the permitted development rules concerning what extensions, improvements and alterations a householder may
make to their house and the area around it without the need for an application for
planning permission. Houses created through the permitted development rights to
change use from shops, financial and professional services premises or agricultural
buildings, which were introduced in April 2014, cannot use these permitted
development rights to improve, alter or extend homes and planning permission should be sought.
The 2008, 2013 and 2014 rules on household permitted development amend rules in
the 1995 Order.
Some of the terms used in the amending rules remain are defined in the 1995 Order. These include: “dwellinghouse” – does not include buildings containing one or more flats or a single flat contained within a building. Note, however, that for the purposes of this guidance, the word “house” is used rather than “dwellinghouse” unless the legislation is quoted directly. “Building” – includes any part of a building and includes any structure or erection, but does not include mechanical plant or machinery or gates, fences, walls, or other means of enclosure. “Original” – means a building as it existed on 1 July 1948 where it was built before that date, and as it was built when built after that date.
“Existing” – means a building as it existed immediately before any permitted development (eg a house extension) is undertake existing house will include previous development to the house, whether undertaken as permitted developmentor as development resulting from a planning permission from the local authority. “Height” – references to height (for example, the heights of the eaves on a house extension) is the height measured from ground level.
Ground level is the surface of the ground immediately adjacent to the building in question. Where ground level is not uniform (eg if the ground is sloping), then the ground level is the highest part of
the surface of the ground next to the building.
“Article 1(5) land” – this is land within a National Park, the Broads, an area of outstanding natural beauty, an area designated as a conservation area, and land within World Heritage Sites.
The structure of the rules on permitted development
The rules on permitted development are sub-divided into a series of “Parts”. Part 1
specifically deals with development within the curtilage of a house (this is usually the
area of land within which the house sits, but for some houses, may be a smaller. Part 1 is then sub-divided into Classes covering various types of development:
Class A covers the enlargement, improvement or alterations to a house such as rear or side extensions as well as general alterations such as new windows and doors,
and from 30 May 2013 to 30 May 2019 a neighbour consultation scheme for larger
Class B covers additions or alterations to roofs which enlarge the house such as loft
conversions involving dormer windows.
Class C covers other alterations to roofs such as re-roofing or the installation of roof
Class D covers the erection of a porch outside an external door.
Class E covers the provision of buildings and other development on land
surrounding the house (the “curtilage”).
Class F covers the provision of hard surfaces on land surrounding the house such
Class G covers the installation, alteration, or replacement of a chimney, flue or soil
and vent pipe
Class H covers the installation, alteration, or replacement of microwave antenna
Such as satellite dishes.
There are also other Parts of the rules that may be relevant to householders. For
example Part 2 covers matters such as erection or construction of gates, fences and
walls. Part 40 covers the installation of domestic micro-generation equipment such
as solar panels).
When considering whether a development proposal is permitted development, all of
the relevant Parts of the rules and all the Classes within those Parts need to be
taken into account. So whilst Part 1 Class A prevents the installation, alteration or
replacement of a chimney, flue or soil and vent pipe from being permitted
development, Class G includes such development as permitted development subject
to the rules set out under that Class.
Similarly, changes to the roof of a house are not permitted development under Class A,
but may be permitted development under Class B or C. For example, where a proposed two
storey extension at the rear of a house has a roof that joins onto the main roof of the original house, the works will need to meet the requirements of both.
Class A (which covers the enlargement of the house) and Class C (which covers any alterations to the roof) in order to be permitted development. If the works also include the creation of a dormer window to enlarge the roof space, either in the extension or the original roof space, then they would also need to meet the
requirements of Class B.
In order to be permitted development, a proposal must meet all the limitations and
conditions under the Classes relevant to the proposal.It is therefore essential that any proposed household development is considered in the context of the permitted development rules as a whole in order to determine whether it benefits from permitted development rights and therefore does not require
an application for planning permission.
Further restrictions on permitted development
A local planning authority may have removed some permitted development rights by
issuing what is known as an Article 4 Direction or may have removed those rights on
the original, or any subsequent, planning permission for the house. This will mean a
planning application will be needed for development which normally does not need
one. Before undertaking any development, checks should be undertaken with the
local planning authority to determine whether any restrictions on permitted
development have been made.
The remainder of this guidance provides further explanation about the detailed rules
covering what improvements can be made to a house and its surroundings as
permitted development. In particular, it provides more details on the limits (eg on size) and the conditions that will need to be complied with if development is to take place without the need for an application for planning permission. The guidance covers in detail Classes A-E of the rules which cover common development projects such as extensions, loft conversions, alterations to a roof, porches, and buildings on
land surrounding the house. The rules for Classes F-H are included in this
document; detailed guidance on them is not included, although cross-references are
included to other guidance published by CLG
This provides permitted development rights for the enlargement, improvement or other alteration of a house.
Under Class A the following limits and conditions apply: A.1 Development is not permitted by Class A if –
(a) 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)
Extensions (including previous extensions) and other buildings must not exceed 50%
of the “curtilage”. What is defined as the curtilage for a particular house will vary according to a number of factors, but in most cases it will comprise the area of land around the original house
(ie what is understood to be the garden/grounds of the house). But the curtilage may be a smaller area in some cases, especially in the case of properties with large grounds set in the countryside.
The 50% limit covers all buildings so will include existing and proposed outbuildings
as well as any existing or proposed new extensions to a house. It will exclude the
area covered by the house itself but will include any separate detached buildings
built prior to 1948 (eg a detached garage)
In the diagram below, the maximum area that can be built on as permitted
development, whether as an extension to the house, or outbuildings erected under
Class E would be 50% of the white area.
(b) the height of the part of the dwellinghouse enlarged, improved or altered would exceed the height of the highest part of the roof of the existing dwellinghouse
Any enlargement, improvement, or alteration to a house must not exceed the height of the highest part of the roof of the existing house. If it does, an application for planning permission will be required.
The highest part of the roof of the existing dwelling house will be the height of the ridge line of the main roof (even though there may be other ridge lines at a lower
level) or the height of the highest roof where roofs on a building are flat.
Chimneys, firewalls, parapet walls and other protrusions above the main roof ridge
line should not be taken into account when considering the height of the highest part of the roof of the existing house.
However, when calculating the height of the part of the house enlarged, this measurement should be at the highest part of the enlargement and should include any protrusions above the roof such as parapet walls etc
(c) the height of the eaves of the part of the dwellinghouse enlarged,
improved or altered would exceed the height of the eaves of the existing dwellinghouse
For the purpose of measuring height, the eaves of a house are the point where the lowest point of a roof slope, or a flat roof, meets the outside wall.
The height of the eaves will be measured from the natural ground level at the base of the external wall of the extension to the point where the external wall would meet projected upwards) the upper surface of the roof slope. Parapet walls and
overhanging parts of eaves should not be included in any calculation of eaves height
The following example shows the side view of an extension with a pitched roof
Where the existing house has eaves of different heights, then the restriction on the
Where an extension is beyond any side wall, the restrictions in (h) will apply. Any
These sunroom extensions come under the same planning rules and regulations as conservatories, therefore with the present conditions you can build up to 3m projection on a semi detached property and up to 4m on a detached property without planning permission(unless you have restrictions).
In some cases you can go beyond the 3m or 4m projection without a full planning application.
Click below for more information(online with word or google drive)
Permitted development for household Technical Guidance in Google drive
If you would like a PDF copy please request by email
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