In many cases installing a flue on non-domestic buildings as part of a biomass heating system, or a combined heat and power system, is likely to be considered 'permitted development' with no need to apply to the local planning authority for planning permission. There are, however, important limits which must be met to benefit from the permitted development rights (see below).
Non-domestic land for the purposes of these permitted development rights is broad and can include businesses and community buildings. Permitted development rights are also available for domestic properties.
Details for biomass systems can be found here.
Details for combined heat and power systems can be found here.
You may wish to discuss with the local planning authority for your area whether all of the limits will be met.
Installing a flue as part of a biomass heating system, or combined heat and power system, on a non-domestic building
In order to be considered permitted development, all the following limits must be met:
- the capacity of the system must not exceed 45 kilowatts thermal
- the flue must not be more than one metre higher than the highest part of the roof, or the height of an existing flue which is being replaced, whichever is the highest
- permitted development rights do not apply to installing flues on listed buildings, within the grounds of a listed building, or on a site designated as a scheduled monument
- you only have one flue, forming part of either a biomass heating system or a combined heat and power system, on the same building.
If the building is on designated land* the flue cannot be installed on a wall or roof slope which fronts a highway.
* Designated land includes national parks, Areas of Outstanding Natural Beauty, conservation areas and World Heritage Sites.
Note - If you are a leaseholder you may need to get permission from your landlord, freeholder or management company.