The Town and Country Planning (General Permitted Development) (England) Order 2015 No. 596

SCHEDULE 2 Permitted development rights

PART 14 Renewable energy

Class E – installation or alteration etc of flue for biomass heating system on domestic premises

Development not permitted

E.1  Development is not permitted by Class E if—

(a) the height of the flue would exceed the highest part of the roof by 1 metre or more; or

(b) in the case of land within a conservation area or which is a World Heritage Site, the flue would be installed on a wall or roof slope which fronts a highway.