Class E – Flue for biomass heating system on residential


flue for biomassWhilst you do not need planning permission for a biomass heating system, you will need an external flue for the biomass boiler. 

For residential properties or blocks of flats, this is covered under Class E of Part 14. 

As long as the flue does not extend more than 1 metre above the highest point of the roof or in the case of a conservation area or world heritage site isn’t on a wall or roof slope facing a highway you are fine. You will not require planning permission.

Apart from these two minor restrictions on a flue for a biomass heating system you can crack on. 

If the building is listed you will require listed building consent.

Biomass is a renewable energy source, generated from burning wood, plants and other organic matter, such as manure or household waste. It releases carbon dioxide when burned, but considerably less than fossil fuels.

Biomass heating systems burn wood pellets, chips or logs to provide warmth in a single room or to power central heating and hot water boilers.

For the commercial version of this, please see Class N of Part 14




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

Permitted development

E. The installation, alteration or replacement of a flue, forming part of a microgeneration biomass heating system, on a dwellinghouse or a block of flats.

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.



Page Updated:  4th March 2023