Planning Permission for Micro CHP Systems

Generally, you won't need planning permission if you're installing a micro combined heat and power (CHP) system entirely inside your home.

However, if your installation requires an external flue pipe, it will usually fall under 'permitted development'. This means you can proceed without a full planning application, provided you meet the following specific criteria:

• If you fit the flue on the rear or side of your building, it must not extend more than one metre above the highest part of your roof.

• For properties that are listed buildings or located within a designated area, you must always consult your local planning authority before installing an external flue. This check is necessary even if you would typically benefit from permitted development rights. Also, be aware that any internal alterations you make might also require their consent.

• In a conservation area or a World Heritage site, you are not permitted to install a flue on the principal (main front) or side elevation if it would be visible from a public highway.

If your micro CHP project involves building a separate external structure for storing fuel or related equipment, the same planning regulations that apply to other extensions and garden outbuildings will be applicable.