Class A – extensions etc of [commercial, business or service premises] E+W
Permitted developmentE+W
A. The extension or alteration of a [commercial, business or service] establishment.
Development not permittedE+W
A.1 Development is not permitted by Class A if—
(a)the gross floor space of the original building would be exceeded by more than—
(i)in respect of an original building or a development on—
(aa)article 2(3) land, or
(bb)a site of special scientific interest,
25% or 50 square metres (whichever is the lesser);
(ii)in any other case, 50% or 100 square metres (whichever is the lesser);
(b)the height of the building as extended would exceed 4 metres;
(c)any part of the development (other than an alteration)—
(i)is on land which—
(aa)adjoins other premises which are used for a purpose falling within any of the classes in Part C (residential premises or institutions) of [Schedule 1] to the Use Classes Order,
(bb)is article 2(3) land, or
(cc)is a site of special scientific interest, and
(ii)is within 2 metres of any boundary of the curtilage of the premises;
(d)the development would be within the curtilage of a listed building;
(e)any alteration would be on article 2(3) land;
(f)the development would consist of or include the construction or provision of a verandah, balcony or raised platform;
(g)any part of the development would extend beyond [the front of any existing building] ;
(h)the development would involve the insertion or creation of a new shop front or the alteration or replacement of an existing shop front; or
(i)the development would involve the installation or replacement of a security grill or shutter on a shop front.
ConditionsE+W
A.2 Development is permitted by Class A subject to the following conditions—
(a)any alteration is at ground floor level only;
(b)any extension is, in the case of article 2(3) land, constructed using materials which have a similar external appearance to those used for the building being extended; and
(c)any extension or alteration is only to be used as part of, or for a purpose incidental to, the use of the [commercial, business or service] establishment.
Interpretation of Class AE+W
A.3 For the purposes of Class A—
[“raised platform” means a platform with a height greater than 0.3 metres,] and
[“ commercial, business or service premises ” means a building, or part of a building, used for any purpose within Class E (commercial, business and service) of Schedule 2 to the Use Classes Order and includes buildings with other uses in other parts as long as the other uses are not within the parts being altered or extended;]
and where 2 or more original buildings are within the same curtilage and are used for the same undertaking, they are to be treated as a single original building in making any measurement.