T.1 Development is not permitted by Class T(a) if—
(a)in the case of the installation of apparatus (other than on a building) the apparatus, excluding any antenna, would exceed a height of 15 metres above ground level;
(b)in the case of the alteration or replacement of apparatus already installed (other than on a building), the apparatus, excluding any antenna, would, when altered or replaced, exceed the height of the existing apparatus or a height of 15 metres above ground level, whichever is the greater;
(c)in the case of the installation, alteration or replacement of apparatus on a building, the height of the apparatus (taken by itself) would exceed the height of the existing apparatus or—
(i)15 metres, where it is installed, or is to be installed, on a building which is 30 metres or more in height; or
(ii)10 metres in any other case,
whichever is the greater;
(d)in the case of the installation, alteration or replacement of apparatus on a building, the highest part of the apparatus when installed, altered or replaced would exceed the height of the highest part of the building by more than the height of the existing apparatus or—
(i)10 metres, where it is installed, or is to be installed, on a building which is 30 metres or more in height;
(ii)8 metres, in the case of a building which is more than 15 metres but less than 30 metres in height; or
(iii)6 metres in any other case,
whichever is the greater;
(e)in the case of the installation, alteration or replacement of apparatus (other than an antenna) on a mast, the height of the mast and the apparatus supported by it would, when the apparatus was installed, altered or replaced, exceed any relevant height limit specified in respect of apparatus in paragraphs (a), (b), (c) and (d), and for the purposes of applying the limit specified in paragraph (c), the words “(taken by itself)” in that paragraph are disregarded;
(f)in the case of the installation, alteration or replacement of any apparatus other than—
(i)a mast;
(ii)an antenna;
(iii)any apparatus which does not project above the level of the surface of the ground; or
(iv)radio equipment housing,
the ground or base area of the structure would exceed the ground or base area of the existing structure or 1.5 square metres, whichever is the greater;
(g)in the case of the installation, alteration or replacement of an antenna on a building (other than a mast) which is less than 15 metres in height; on a mast located on such a building; or, where the antenna is to be located below a height of 15 metres above ground level, on a building (other than a mast) which is 15 metres or more in height—
(i)the antenna is to be located on a wall or roof slope facing a highway which is within 20 metres of the building on which the antenna is to be located, unless it is essential for operational purposes that the antenna is located in that position; or
(ii)in the case of dish antennas, the size of any dish would exceed the size of the existing dish when measured in any dimension or 1.3 metres when measured in any dimension, whichever is the greater;
(h)in the case of the installation, alteration or replacement of a dish antenna on a building (other than a mast) which is 15 metres or more in height, or on a mast located on such a building, where the antenna is located at a height of 15 metres or above, measured from ground level the size of any dish would exceed the size of the existing dish when measured in any dimension or 1.3 metres when measured in any dimension, whichever is the greater;
(i)in the case of the installation of a mast, on a building which is less than 15 metres in height, such a mast would be within 20 metres of a highway, unless it is essential for operational purposes that the mast is installed in that position; or
(j)in the case of the installation, alteration or replacement of radio equipment housing—
(i)the development is not ancillary to the use of any other electronic communications apparatus; or
(ii)the development would exceed 90 cubic metres or, if located on the roof of a building, the development would exceed 30 cubic metres.