STRUCTURAL CALCULATIONS
PLANNING DESIGN
BUILDING REGULATIONS
DISCOUNT PLANS LTD
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General Permitted Development Order 2022 - GPDO
Permitted development rights have been around since 1995 and have been set out by the government to enable homeowners to undertake all different types of building works or to be able to change the use of the property without needing to apply for planning permission to the local authority you reside in. Permitted development is basically a national grant of planning permission allowance for Extensions (single-storey to double storey's, rear or sides), Loft Conversions and Outbuildings. However, permitted development rights are subject to conditions and limitations so as to control the impact of the area and neighbouring houses, also looking after and protecting the local amenity of other property's. Larger home extension applications have been introduced to allow homeowners to double the size of their proposals set under the standard Permitted Development legislation helping to create more space without the need to move house, boosting the building trade economy. We hope you like this article and it makes some use for you.
EXPLAINING THE PERMITTED DEVELOPMENT ORDERS ONE BY ONE
First, is your property entitled to the following Permitted development designs listed below? When applying to the council for any proposal which falls under Permitted Development we must establish if the property falls within the GPDO criteria. We will Ask the homeowner, builder or customer several questions based on their property's status. This would be the first point of call to get a clearer view of if it's worth spending the time designing and submitting drawings to the council for them to review finding out the proposal is invalid. Listed below are the questions we would like to understand before starting any project with the client. Some of the questions the client would not know as hidden restrictions are sometimes on council records only or are listed on deeds that are held by the lenders.
THE FOLLOWING QUESTIONS WOULD BE VERY HELPFUL TO ENABLE IF AN APPLICATION OR CREATION OF DRAWINGS IS RECOMMENDED
Is the Property a HOUSE?
if the property is a HMO or a flat / maisonette or if the property is located within a conservation area then PD rules will not apply
Is the Property a LISTED BUILDING?
most of PD works will need a listed building consent. for a listed building, class e does not apply and a separate application is needed
Is the Property on Article 2 Land or in a Conservation Area? or has the Property previously been extended?
if so then a fall planning application is needed
Have the PD rights been removed by an Article 4 direction or by a Condition from a previous application?
if so then a fall planning application is needed
After reading through the GPDO order and reviewing them one by one we have put together all different schemes that are set out by the GPDO order 2020. Our design team have added the various designs on two types of houses. The first is the most common house style a 1930's type. This house is a standard rectangular shape with a flush rear elevation wall.
(please note that any recesses or bays on your house will be exempt from the following designs below)
The second type of house style would be with a rear deep outrigger (L-Shape) typestyle. Houses built with outriggers are of the same shape but different eras, such as Georgian, Victorian and Edwardian, we have chosen to draw up an Edwardian type style house which is located in the Redbridge borough, Wanstead area so to give a mixed feel of what can be achieved without the need to obtain for planning permission. (although advisable to obtain a certificate of lawfulness)
DUMMIES VISUAL GUIDE ON WHAT CAN BE ARCHIVED UNDER A GPDO APPLICATION
STANDARD 1930 - 1950 UK HOUSE STYLE
CLASS A - GENERAL EXTENSIONS AND ALTERATIONS
"The enlargement or improvement or alteration of a dwelling house"
Must not extend
beyond a side
elevation that
fronts a highway,
or the principal
elevation.
SIDE projection:
• ≤ ½ width of
original house.
REAR projection
if SINGLE storey:
• (*) ≤ 3m for
terrace or semidetached
house.
• (*) ≤ 4m for
detached house.
REAR projection
if TWO-storey:
• ≤ 3m.
MAX height:
• ≤ 4m if single
storey.
• Not higher than
ridge-line of house.
≤ 50% coverage
of original garden.
EAVES height:
• ≤ 3m if within 2m
of a boundary.
(This prevents twostorey
extension
close to boundary)
• Not higher than
eaves of house.
OTHER LIMITATIONS:
• No verandah, balcony, or raised platform.
• No two-storey side extension.
• Two-storey extension ≥ 7m to rear boundary.
CONDITIONS:
• Materials “of a similar appearance” to existing house.
• Upper-floor side windows obscure-glazed and non-opening.
• Roof pitch of two-storey extension same as original house.
ARTICLE 2(3) LAND:
• No cladding.
• No side extension.
• No two-storey rear extension.
CLASS A - LARGER EXTENSIONS - NEIGHBOURING CONSENT
"permitted development by class a extending to limits from 30/05/2013 larger homes extensions"
REAR Projection if SINGLE storey:
• ≤ 6m for terrace or semidetached house.
• ≤ 8m for a detached house.
REAR projection
if TWO-storey:
• Not allowed.
OTHER LIMITATIONS AND CONDITIONS:
• The larger rear extension must comply
with all of the limitations and conditions
shown on Class A Fig 1.1 (unless shown
otherwise on this Fig 1.2).
IMPORTANT NOTE:
• The development must not begin before the developer
successfully completes the prior approval process.
For more information, see the following:
“Part 1 of the GPDO - Larger Rear Extensions - Guide”
ARTICLE 2(3) LAND:
• NOT allowed
on article 2(3) land NOR
on a Site of Special
Scientific Interest (SSSI).
CLASS AA - ADDING ADDITIONAL STOREYS
"permitted development by adding another storey from 30/08/2020"
Max height ≤ 18m.
Roof pitch same as existing house.
FLOOR to CEILING
height (internal):
• ≤ 3m, AND
• ≤ Floor to ceiling
height of the
shortest storey of
the “principal part”
of existing house.
Class AA does NOT apply if the house was built either:
• Before 01/07/1948.
• After 28/10/2018.
HEIGHT if existing
house = 1 storey:
• = 1 additional storey.
• ≤ 3.5m above
existing house.
• ≤ 3.5m above highest other attached building.
HEIGHT if existing
house ≥ 2 storeys:
• ≤ 2 additional storeys.
• ≤ 7m above
existing house.
• ≤ 3.5m above highest other attached building.
Note: Any additional storey must be on the “principal part”
of existing house.
OTHER LIMITATIONS AND CONDITIONS:
• Resulting house must be C3 dwellinghouse.
• Similar materials, and no side windows.
• See legislation for full information.
IMPORTANT NOTE:
• The development must not begin before the developer
successfully completes the prior approval process.
For more information, see the following:
“Part 1 of the GPDO - Larger Rear Extensions - Guide”
ARTICLE 2(3) LAND:
• No cladding.
• No side extension.
• No two-storey rear extension.
CLASS B - ROOF EXTENSIONS
"the enlargement of a dwelling house consisting of an addition or alteration to its roof"
Not higher than ridge-line of house.
VOLUME: fronts a highway.
• ≤ 40m3 for
terrace house.
• ≤ 50m3 for
semi-detached or
detached house.
Set back ≥ 20cm
from eaves (does
not apply to hip to-
gable, etc) and
must not extend
beyond outside face of wall.
Must not extend
beyond a principal
elevation that
fronts a highway.
If a house sits on a corner plot where a side elevation fronts a highway, there will be an additional restriction on permitted development to the side of the house.
OTHER LIMITATIONS:
• Class B does NOT apply if Class AA used.
• No verandah, balcony, or raised platform.
• (See Class G for chimney, flue, SVP).
CONDITIONS:
• Materials “of a similar appearance” to existing house.
• Side windows obscure-glazed and non-opening.
ARTICLE 2(3) LAND:
• Class B does NOT apply
on article 2(3) land.
CLASS C - ROOF LIGHTS AND RE-ROOFING
"other alterations to the existing roof of the dwelling house"
OTHER LIMITATIONS:
• (See Class G for chimney, flue, SVP).
• (See Part 14 Class A for solar panels).
ARTICLE 2(3) LAND:
• (No additional requirements).
CONDITIONS:
• Side windows obscure-glazed and non-opening.
• (No restrictions relating to materials).
Not higher than ridge-line of house.
Protrusion ≤ 15cm.
CLASS D - PORCHES
"the construction or erection of a porch outside any external door of a dwelling house "
OTHER LIMITATIONS:
• Non.
CONDITIONS:
• (No restrictions relating to materials).
ARTICLE 2(3) LAND:
• (No additional requirements).
Porch ≥ 2m
from highway.
Area of
porch ≤ 3m2.
Max height
≤ 3m.
CLASS E - OUTBUILDINGS AND SWIMMING POOLS
"building or enclosure, swimming pool or pool required for any purpose incidental to the enjoyment of the dwelling house "
OTHER LIMITATIONS AND CONDITIONS:
• No verandah, balcony, or raised platform.
• Not within the curtilage of a listed building.
• (No restrictions relating to materials).
IMPORTANT NOTE:
• The use of the outbuilding (or pool) must be “incidental” to the main house (e.g. garage, store room, games room, home gym, swimming pool, etc). The outbuilding can NOT normally include a bedroom, a bathroom, or a kitchen.
ARTICLE 2(3) LAND:
• Not allowed between a side elevation and a boundary. Also, see legislation if AONB,
National Park, Broads, or WHS.
≤ 50% coverage
of original garden.
Must be
single storey.
MAX height:
• ≤ 2.5m if within
2m of a boundary.
Otherwise:
• ≤ 4m if roof is
dual-pitched.
• ≤ 3m if roof is
not dual-pitched.
Not forward of the principal elevation.
EAVES height:
• ≤ 2.5m.
CLASS F - HARD SURFACES
"any hard surface for any purpose incidental to the enjoyment of the dwelling house "
OTHER LIMITATIONS:
• Non.
CONDITIONS:
• Non.
ARTICLE 2(3) LAND:
• Class B does NOT apply
on article 2(3) land.
If the hard surface
is BOTH > 5m2 AND between the principal
elevation and a highway,
then it must be either:
• Non-porous (shown in
white) but run-off to a
porous area within the
curtilage of the house.
or
• Porous (shown in blue).
CLASS G - CHIMNEYS, FLUES & SVP'S
"installation alteration or replacement of a chimney, flue or soil vent pipe on a dwelling house"
OTHER LIMITATIONS:
• Non.
CONDITIONS:
• Non.
ARTICLE 2(3) LAND:
• Not allowed on a principal or side elevation that fronts a highway.
Not ≥ 1m higher than
ridge-line of house.
CLASS H - SATELLITE DISHES
"installation alteration or replacement of a microwave dish on a dwelling house or within the curtilage of a dwelling house"
OTHER LIMITATIONS:
• Cubic capacity ≤ 35 litres.
• See legislation for full info.
CONDITIONS:
• Must be sited to minimise its effect on the external
appearance of the building (so far as practicable).
• Must be removed if no longer needed.
ARTICLE 2(3) LAND:
• Not on elevation that faces
highway (assuming visible).
• See legislation for full info.
DUMMIES VISUAL GUIDE ON WHAT CAN BE ACHIVED UNDER A GPDO APPLICATION
Maximum of 2
satellite dishes:
• One ≤ 100cm.
• Other ≤ 60cm.
If not on chimney:
• Length ≤ 100cm.
• No higher than
chimney or 60cm
above ridge-line
(whichever lower).
If on chimney:
• Length ≤ 60cm.
• No higher than
chimney.
1714 - 1837 GEORGIAN HOUSE STYLES
1837 - 1901 VICTORIAN HOUSE STYLES
1901 - 1910 EDWARDIAN HOUSE STYLES
WITH REAR PROJECTION - "OUTRIGGER"
CLASS A - GENERAL EXTENSIONS AND ALTERATIONS
"The enlargement or improvement or alteration of a dwelling house"
OTHER LIMITATIONS:
• No verandah, balcony, or raised platform.
• No two-storey side extension.
• Two-storey extension ≥ 7m to rear boundary.
CONDITIONS:
• Materials “of a similar appearance” to existing house.
• Upper-floor side windows obscure-glazed and non-opening.
• Roof pitch of two-storey extension same as original house.
ARTICLE 2(3) LAND:
• No cladding.
• No side extension.
• No two-storey rear extension.
MAX height:
• ≤ 4m if single
storey.
• Not higher than
ridge-line of house.
EAVES height:
• ≤ 3m if within 2m
of a boundary.
(This prevents twostorey
extension
close to boundary)
• Not higher than
eaves of house.
≤ 50% coverage
of original garden.
Must not extend beyond a side elevation that fronts a highway, or the principal
elevation.
SIDE projection:
• ≤ ½ width of
original house.
REAR projection
if SINGLE storey:
• (*) ≤ 3m for
terrace or semidetached
house.
• (*) ≤ 4m for
detached house.
REAR projection
if TWO-storey:
• ≤ 3m.
CLASS A - LARGER EXTENSIONS - NEIGHBOURING CONSENT
"permitted development by class a extending to limits from 30/05/2013 larger homes extensions"
OTHER LIMITATIONS AND CONDITIONS:
• The larger rear extension must comply
with all of the limitations and conditions
shown on the previous page (unless shown
otherwise on this current page).
IMPORTANT NOTE:
• The development must not begin before the developer successfully completes the prior approval process.
For more information, see the following:
“Part 1 of the GPDO - Larger Rear Extensions - Guide”
ARTICLE 2(3) LAND:
• NOT allowed on article 2(3) land NOR on a Site of Special
Scientific Interest (SSSI).
REAR Projection if SINGLE storey:
• ≤ 6m for terrace or semidetached house.
• ≤ 8m for a detached house.
REAR projection
if TWO-storey:
• Not allowed.
REAR Projection if SINGLE storey:
• ≤ 6m for terrace or semidetached house.
• ≤ 8m for a detached house.
REAR projection
if TWO-storey:
• Not allowed.
CLASS AA - ADDING ADDITIONAL STOREYS
"permitted development by adding another storey from 30/08/2020"
IMPORTANT NOTE:
Class AA does NOT apply if the house was built either:
• Before 01/07/1948.
• After 28/10/2018.
(so Class AA does NOT apply to Victorian, Edwardian or Georgian houses)
CLASS B - ROOF EXTENSIONS
"the enlargement of a dwelling house consisting of an addition or alteration to its roof"
OTHER LIMITATIONS:
• Class B does NOT apply if Class AA used.
• No verandah, balcony, or raised platform.
• (See Class G for chimney, flue, SVP).
CONDITIONS:
• Materials “of a similar appearance” to existing house.
• Side windows obscure-glazed and non-opening.
ARTICLE 2(3) LAND:
• Class B does NOT apply
on article 2(3) land.
Set back ≥ 20cm
from eaves (does
not apply to hip to-
gable, etc) and
must not extend
beyond outside face of wall.
Must not extend
beyond a principal
elevation that
fronts a highway.
Not higher than ridge-line of house.
VOLUME: fronts a highway.
• ≤ 40m3 for
terrace house.
• ≤ 50m3 for
semi-detached or
detached house.
If a house sits on a corner plot where a side elevation fronts a highway, there will be an additional restriction on permitted development to the side of the house.
CLASS C - ROOF LIGHTS AND RE-ROOFING
"other alterations to the existing roof of the dwelling house"
Protrusion ≤ 15cm.
Not higher than ridge-line of house.
OTHER LIMITATIONS:
• (See Class G for chimney, flue, SVP).
• (See Part 14 Class A for solar panels).
ARTICLE 2(3) LAND:
• (No additional requirements).
CONDITIONS:
• Side windows obscure-glazed and non-opening.
• (No restrictions relating to materials).
CLASS D - PORCHES
"the construction or erection of a porch outside any external door of a dwelling house "
Area of
porch ≤ 3m2.
Max height
≤ 3m.
ARTICLE 2(3) LAND:
• (No additional requirements).
Porch ≥ 2m
from highway.
CONDITIONS:
• (No restrictions relating to materials).
OTHER LIMITATIONS:
• Non.
CLASS E - OUTBUILDINGS AND SWIMMING POOLS
"building or enclosure, swimming pool or pool required for any purpose incidental to the enjoyment of the dwelling house "
IMPORTANT NOTE:
• The use of the outbuilding (or pool) must be “incidental” to the main house (e.g. garage, store room, games room, home gym, swimming pool, etc). The outbuilding can NOT normally include a bedroom, a bathroom, or a kitchen.
ARTICLE 2(3) LAND:
• Not allowed between a side elevation and a boundary. Also, see legislation if AONB,
National Park, Broads, or WHS.
MAX height:
• ≤ 2.5m if within
2m of a boundary.
Otherwise:
• ≤ 4m if roof is
dual-pitched.
• ≤ 3m if roof is
not dual-pitched.
OTHER LIMITATIONS AND CONDITIONS:
• No verandah, balcony, or raised platform.
• Not within the curtilage of a listed building.
• (No restrictions relating to materials).
≤ 50% coverage
of original garden.
Must be
single storey.
OTHER LIMITATIONS:
• Non.
CONDITIONS:
• Non.
ARTICLE 2(3) LAND:
• Class B does NOT apply
on article 2(3) land.
If the hard surface
is BOTH > 5m2 AND between the principal
elevation and a highway,
then it must be either:
• Non-porous (shown in
white) but run-off to a
porous area within the
curtilage of the house.
or
• Porous (shown in blue).
CLASS F - HARD SURFACES
"any hard surface for any purpose incidental to the enjoyment of the dwelling house "
CLASS G - CHIMNEYS, FLUES & SVP'S
"installation alteration or replacement of a chimney, flue or soil vent pipe on a dwelling house"
OTHER LIMITATIONS:
• Non.
CONDITIONS:
• Non.
ARTICLE 2(3) LAND:
• Not allowed on a principal or side elevation that fronts a highway.
Not ≥ 1m higher than
ridge-line of house.
CLASS H - SATELLITE DISHES
"installation alteration or replacement of a microwave dish on a dwelling house or within the curtilage of a dwelling house"
ARTICLE 2(3) LAND:
• Not on elevation that faces
highway (assuming visible).
• See legislation for full info.
CONDITIONS:
• Must be sited to minimise its effect on the external
appearance of the building (so far as practicable).
• Must be removed if no longer needed.
If on chimney:
• Length ≤ 60cm.
• No higher than
chimney.
Maximum of 2
satellite dishes:
• One ≤ 100cm.
• Other ≤ 60cm.
If not on chimney:
• Length ≤ 100cm.
• No higher than
chimney or 60cm
above ridge-line
(whichever lower).
OTHER LIMITATIONS:
• Cubic capacity ≤ 35 litres.
• See legislation for full info.
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