Extension to a dwelling (including a conservatory)
The enlargement of a dwellinghouse (including the erection of an extension or conservatory).
a) the general conditions applicable to Section A (Section A – page 15 refers);
b) the floorspace (measured externally) of the extension must not exceed 15sqm beyond that of the original dwellinghouse;
c) the extension must not exceed 4 metres in height above ground level;
d) no part of the extension may be nearer to any highway which bounds the curtilage of the dwellinghouse than:- that part of the dwellinghouse nearest to that highway, or 20 metres, whichever is the nearer.
e) no part of the extension may be nearer than 1 metre to the boundary of the curtilage of the dwellinghouse;
f) the external finish of any walling must match that on the major part of the dwellinghouse; and
g) operations within this class are allowed only if, on completion of the operations, at least 2 car parking spaces remain within the curtilage of the dwellinghouse.
For the purpose of paragraph (g) the minimum size permitted for a car parking space is 6 metres by 3.25 metres.
Click this link to download the full order, Class 14 Page 16 refers.