The Town and Country Planning (General Permitted Development) (Amendment) (Wales) Order 2013

Development not permitted

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);

(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;

(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;

(d)the enlarged part of the dwellinghouse would be within 2 metres of the boundary of the curtilage of the dwellinghouse and—

(i)the height of the eaves of any part of the enlarged part which is within 2 metres of the boundary of the curtilage of the dwellinghouse would exceed 3 metres; or

(ii)the height of any part of the enlarged part which is within 2 metres of the boundary of the curtilage of the dwellinghouse would exceed 4 metres;

(e)the enlarged part of the dwellinghouse would extend beyond a wall comprised in the principal elevation of the original dwellinghouse;

(f)the enlarged part of the dwellinghouse would extend beyond a wall comprised in a side elevation of the existing dwellinghouse, and would be nearer to the highway than—

(i)the wall comprised in that side elevation which is nearest to the highway; or

(ii)any point 5 metres from the highway;

whichever is the nearer to the highway;

(g)the enlarged part of the dwellinghouse would extend beyond a wall comprised in a side elevation of the original dwellinghouse, would have a single storey and—

(i)the enlarged part of the dwellinghouse would exceed 4 metres in height; or

(ii)the width of the widest part of the resulting dwellinghouse would exceed the width of the widest part of the original dwellinghouse by more than 50%;

(h)the enlarged part of the dwellinghouse would extend beyond a wall comprised in a side elevation of the original dwellinghouse, would have more than one storey, either in its own right or if considered together with any part of the existing dwellinghouse, and—

(i)the enlarged part of the dwellinghouse would be within 10.5 metres of any boundary which is—

(aa)a boundary of the curtilage of the dwellinghouse; and

(bb)opposite the relevant side elevation;

(ii)the enlarged part of the dwellinghouse would be set back, by less than 1 metre, from the point nearest to that part in any wall comprised in the principal elevation of the original dwellinghouse; or

(iii)the width of the widest part of the resulting dwellinghouse would exceed the width of the widest part of the original dwellinghouse by more than 50%;

(i)the enlarged part of the dwellinghouse would extend beyond the rear wall of the original dwellinghouse, would have a single storey and would —

(i)extend beyond the relevant part or, as the case may be, any of the relevant parts of the rear wall of the original dwellinghouse by more than 4 metres; or

(ii)exceed 4 metres in height;

(j)the enlarged part of the dwellinghouse would extend beyond the rear wall of the original dwellinghouse, would have more than one storey, either in its own right or if considered together with any part of the existing dwellinghouse, and—

(i)the ground floor storey would extend beyond the relevant part or, as the case may be, any of the relevant parts of the rear wall of the original dwellinghouse by more than 4 metres;

(ii)the first floor or higher storey would extend beyond the relevant part or, as the case may be, any of the relevant parts of the rear wall of the original dwellinghouse by more than 3 metres; or

(iii)the first floor or higher storey would be within 10.5 metres of any boundary which is—

(aa)a boundary of the curtilage of the dwellinghouse; and

(bb)opposite the rear wall of the dwellinghouse;

(k)it would consist of or include external wall insulation which projects from that part of the exterior of the dwellinghouse to which it is affixed by more than 16 centimetres; or

(l)it would consist of or include—

(i)the construction or provision of a veranda or raised platform;

(ii)the construction or provision of a balcony which—

(aa)contains a platform of any description;

(bb)projects from the part of the exterior of the dwellinghouse to which it is affixed by more than 30 centimetres;

(cc)if projected downwards in a vertical line to ground level, is within 10.5 metres of any boundary of the curtilage of the dwellinghouse opposite the relevant side elevation; or

(dd)would be affixed to a wall comprised in the principal elevation of the dwellinghouse;

(iii)the construction or provision of a roof terrace, whether or not it would incorporate associated railings, fencing or other means of enclosure;

(iv)the installation, alteration or replacement of a microwave antenna;

(v)the installation, alteration or replacement of a chimney;

(vi)the installation, alteration or replacement of an air source heat pump, solar PV or solar thermal equipment or a flue forming part of a biomass heating system or combined heat and power system;

(vii)the installation of shutters on any part of the principal elevation of the dwellinghouse; or

(viii)an alteration to any part of the roof of the dwellinghouse, being an alteration which does not fall within paragraphs A.1(l)(i) to(vii).