Permitted Development England
How to build a
home extension without Planning Permission using your PD rights - Oct. 1st
2008
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Certificate of Lawful Development Appeal Decisions by category of development.The Town and Country Planning (General Permitted Development)
Order 1995
Class A development
· · See entries under separate heading “Interaction between Class A, Class B, and Class C”. · See entries under separate heading “Interaction between Class A and Class D”. · See entries under separate heading “Interaction between Class A and Class E”.
A.1(a):
·
For
the purposes of Class A, part A.1(a) and Class A, part E.1(a), a (separate)detached structure (such as a
detached garage) built prior to 1948 is
not part of “the
original dwellinghouse”. As such, a detached garage will always count as having
used up some of the 50% limit, regardless of when it was built.
A.1(b):
· See entries under separate heading “Height”. · See entries under separate heading “Highest Part of the … Roof”.
A.1(c):
· See entries under separate heading “Height”. · See entries under separate heading “Eaves”.
·
Where a house has eaves at
different levels, the “height of the eaves of the existing dwellinghouse” referred to in Class A, part A.1(c)
should be taken as the highest eaves level.
·
Where a house has eaves at
different levels, the “height of the eaves of the existing dwellinghouse” referred to in Class A, part A.1(c)
should be taken as the predominant eaves level.
A.1(d):
· See entries under separate heading “Principal Elevation”. · See entries under separate heading “A Side Elevation of the original dwellinghouse”. · See entries under separate heading “Fronts a highway”. · See entries under separate heading “Highway”. · See entries under separate heading “Basements”.
·
Where the principal elevation
fronts a highway, Class A, part A.1(d) not only prevents an extension from being directly attached to
the principal elevation, but also prevents an extension attached to a side elevation from projecting
beyond the imaginary line of the principal elevation when extended to either side. In other words, the phrase
“extends beyond a wall” not only applies to extensions directly attached to that wall, but also applies to
extensions that extend beyond the line of that wall.
·
Where the side elevation fronts
a highway, Class A, part A.1(d) not only prevents an extension from being directly attached to the
side elevation, but also prevents an extension attached to the rear (or front) elevation from
projecting beyond the imaginary line of the side elevation when extended to either side. In other words, the
phrase “extends beyond a wall” not only applies to extensions directly attached to that wall, but also
applies to extensions that extend beyond the line of that wall.
·
Where the principal elevation
does not front a highway, an extension can extend in front of the principal
elevation.
·
Furthermore, in such cases, the
amount by which the extension can extend beyond the principal elevation does not appear to be
directly* restricted by any limitation.
·
Where the front wall of a side
extension would be in line with the principal elevation (i.e. in accordance with the forward projection limit
of Class A, part A.1(d)), but the eaves / guttering / soffit / fascia of the extension would project slightly
forward of this line, then this would still be permitted
development.
A.1(e):
· See entries under separate heading “The rear wall of the original dwellinghouse”. · See entries under separate heading “Interaction between A.1(e)/(f) and A.1(h)”. · See entries under separate heading “Height”. · See entries under separate heading “Basements”. · See entries under separate heading “Detached dwellinghouse” (versus “any other dwellinghouse”) and “terrace house” (versus “in any other case”)
·
Class A, part A.1(e) not
only restricts an extension directly attached to the rear wall from projecting beyond the latter by more
than 3m/4m, but also restricts an extension attached to a side wall from projecting beyond the
imaginary line of the rear wall (i.e. when extended to either side) by more than 3m/4m. In other words, the
phrase “extends beyond the rear wall” not only applies to extensions directly attached to the rear wall, but
also applies to extensions attached to other walls that extend beyond the line of the rear
wall.
·
Where the original rear
elevation of a property is flat, Class A, part A.1(e) does not in itself restrict the width of the
extension to the width of the original rear wall.
·
Where a property has a
(part-width) original rear projection, an extension to the rear of this is limited to the width of the
original rear projection.
·
Where the rear wall of an
extension would comply with the 3m/4m rear projection limit of Class A, part A.1(e), but the eaves /
guttering / soffit / fascia of the extension would project slightly past this line, then this would still be permitted development.
·
Where an extension within an
infill area would leave a courtyard, and then project past the end of the original rear projection and wrap
around the latter, it would not be permitted
development.
A.1(f):
· See entries under separate heading “The rear wall of the original dwellinghouse”. · See entries under separate heading “Interaction between A.1(e)/(f) and A.1(h)”. · See entries under separate heading “Basements”.
·
Class A, part A.1(f) applies
not only to a proposed two-storey rear extension, but also to a proposed first floor rear
extension on top of an existing ground floor rear extension.
·
Where it is proposed to erect a
two-storey rear extension, Class A, part A.1(f) would restrict both storeys to a depth of 3m. It
therefore is not possible on a detached property to erect (as a single operation) a two-storey rear
extension that has a ground floor with depth 4m and a first floor with depth 3m.
·
If a property has an
existing ground floor rear extension with depth greater than 3m, then it would not be possible
to erect any first floor rear extension on top of the latter, because Class A, part A.1(f) would restrict
both storeys to a depth of 3m.
·
Where it is proposed to erect a
two-storey rear extension, Class A, part A.1(f) would restrict only the first floor to a depth of 3m.
It therefore is possible on a detached property to erect (as a single operation) a two-storey rear
extension that has a ground floor with depth 4m and a first floor with depth 3m.
·
Where the rear wall of an
extension would comply with the 3m rear projection limit of Class A, part A.1(f), but the eaves / guttering /
soffit / fascia of the extension would project slightly past this line, then this would still be permitted development.
A.1(g):
· See entries under separate heading “Height”. · See entries relating to the phrase “within 2m of the boundary” under separate heading “E.1(d)”. · See entries under separate heading “Eaves”.
·
Where parts of a proposed
extension are within 2m of a boundary, the 3m eaves height limit applies not just to those parts
within 2m of the boundary, but to all parts of the proposed extension.
·
Where parts of a proposed
extension are within 2m of a boundary, the 3m eaves height limit applies only to those parts within 2m
of the boundary.
A.1(h):
· See entries under separate heading “A side elevation of the original dwellinghouse”. · See entries under separate heading “Interaction between A.1(e)/(f) and A.1(h)”. · See entries under separate heading “Height”. · See entries under separate heading “Basements”.
·
Under Class A, part A.1(h),
where part of a proposed extension would extend beyond an original side wall, the restriction against having
“a width greater than half the width of the original dwellinghouse” applies to the entire extension
(i.e. not just to that part of the extension that extends beyond the original side wall). In other
words, the overall width of the proposed extension can not be greater than then half the width
of the main house, even if the part of the extension that extends beyond the original side wall does
not do so by more than half the width of the house.
·
Under Class A, part A.1(h),
where part of a proposed extension would extend beyond an original side wall, the restriction against having
“more than one storey” applies to the entire extension (i.e. not just to that part of the
extension that extends beyond the original side wall). In other words, no part of proposed extension
can have more than one storey, even if the part of the extension that extends beyond the original side
wall does not itself have more than one storey.
·
Under Class A, part A.1(h),
where part of a proposed extension would extend beyond an original side wall, the restriction against
exceeding “4m in height” applies to the entire extension (i.e. not just to that part of the
extension that extends beyond the original side wall). In other words, no part of proposed extension
can exceed 4m in height, even if the part of the extension that extends beyond the original side wall
does not itself exceed 4m in height.
·
Under Class A, part A.1(h),
where part of a proposed extension would extend beyond an original side wall, the restriction against having
“a width greater than half the width of the original dwellinghouse” applies only to that part of the
extension that extends beyond the original side wall. In other words, the overall width of the
proposed extension can be greater than then half the width of the main house, so long as the
part of the extension that extends beyond the original side wall does not do so by more than half the width
of the house.
·
Under Class A, part A.1(h),
where part of a proposed extension would extend beyond an original side wall, the restriction against having
“more than one storey” applies only to that part of the extension that extends beyond the original
side wall. In other words, the part of the proposed extension that does not extend beyond the original side
wall can have more than one storey, so long as the part of the extension that extends beyond
the original side wall does not have more than one storey.
·
Where it is proposed to erect
two separate side extensions, one on each side of a detached house, then each of these side
extensions could have a width up to half the width of the original house (i.e. this limit would not
apply to the combined width of the two side extensions).
·
Where the width of a property
varies, the “width of the original dwellinghouse” should be calculated at its widest
point.
·
For the purposes of Class A,
part A.1(h), “width” should be measured in the direction parallel with the line of the principal
elevation. For example, if the principal elevation is (say) the south elevation, then width should be
measured from west to east, and not from north to south.
A.1(i):
· See entries under separate heading “Interaction between Class A, Class B, and Class C”. · See entries under separate heading “Juliette balconies”. · See entries relating to chimneys, flues, and soil and vent pipes under separate heading “Class G”.
A.2(a):
·
In a
conservation area (or
other article 1(5) land), Class A, part A.2(a) not only prevents the cladding of
the main house, but also prevents the cladding of
any extension.
·
For
a property in a conservation area
(
or other article 1(5) land)
where the existing
house is finished in cladding, the combination of Class A, part
A.2(a) and Class A, part A.3(a) would prevent any
extension. This is because the former limitation prevents the
extension from being finished in cladding, whereas the latter condition prevents the extension from being
finished in anything other than cladding.
A.2(b):
· See entries under separate heading “A side elevation of the original dwellinghouse”. · See entries under separate heading “Basements”.
·
Class A, part A.2(b) not only
prevents a proposed two-storey rear extension, but also prevents a proposed first floor rear extension on
top of an existing ground floor rear extension.
A.2(c):
· See entries under separate heading “The rear wall of the original dwellinghouse”. · See entries under separate heading “Basements”.
A.3(a):
· See entries under separate heading “Materials”. · See entries under separate heading “Conditions”. · See entries relating to the phrase “of a similar appearance” under separate heading “B.2(a)”.
A.3(b):
· See entries under separate heading “A side elevation of the original dwellinghouse”. · See entries under separate heading “Obscure-glazed and non-opening”. · See entries under separate heading “Conditions”.
A.3(c):
· See entries under separate heading “Conditions”. · See entries relating to the phrase “so far as practicable” under separate heading “B.2(b)”.
· An illustration of an extension that complies with this condition is provided in the “DCLG - Permitted development for householders - Technical guidance” (August 2010).
·
The assessment of whether it is
“practicable” for the roof pitch of an extension to be the same as the roof pitch of the original house
should focus on structural and practical considerations.
·
Where an applicant claims that
it is not practicable for the roof pitch of an extension to be the same as the roof pitch of the original
house, the burden of proof is firmly on the applicant to demonstrate that this is not
practicable.
·
Where a property has a hipped
roof, it is possible for an extension with a crown roof to comply with Class A, part
A.3(c).
·
Where the roof of an extension
would have a similar angle to the main roof, but would have a different orientation, it is possible
for such an extension to comply with Class A, part A.3(c).
Download documents and diagrams of useful Permitted Development information
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