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Class 23 – Planning permission is not required for the installation of a ground (or water) source heat pump and any associated pipework within the curtilage of a dwellinghouse, provided the Part 2 Section A general conditions are met

(1) No part of the development may be constructed within 9 metres (measured at ground level) of the route of any overhead electrical line carrying 11kv or more (High Tension power cable);

(2) No part of the development may be constructed within 9.1 metres of the bank of any designated watercourse under the Flood Risk Management Act 2013;

Also included from Schedule 4 of the Order

(2A) The operations specified must not be constructed (including any foundations) so as to involve the felling, lopping or limbing of any tree (other than a tree referred to in section 3(3) of the Tree Preservation Act 1993).

(2AB) The following Schedule 1 operations must not be situated closer to a tree (other than referred to in section 3(3) of the Tree Preservation Act 1993) than the required distance (f) Class 23 Heat Pumps

(2B) for the purpose of paragraph (2AB) the “required distance” is

(a) for a tree with a single stem, 12 times the tree’s stem diameter; or

(b) for a tree with more than one stem, 12 times — (stem diameter 1)2 + (stem diameter 2)… + (stem diameter 5)2, where the stem diameter is measured 1.5 metres above ground level.