Smoke control areas and appliance choice in planning

In a smoke control area you may only burn an authorised fuel, or burn any fuel in an appliance that Defra has exempted. That rule comes from the Clean Air Act 1993 and it is enforced by the council's environmental health team. It has nothing to do with planning permission, which is why so many householders install a stove lawfully and then find they cannot legally burn wood in it.

Planning only enters through the flue. If the flue needs consent, and on a listed building or a prominent elevation in a conservation area it usually does, that is a separate application with a separate test.

Where smoke control areas apply

Local authorities declare smoke control areas by order under Part III of the Clean Air Act 1993. Most towns and cities in England have them, often covering the whole authority area, and the boundaries date from the 1950s onwards with later additions.

The declaration sits with the council rather than with central government, and orders can be varied or revoked. That is worth knowing, because a map printed twenty years ago may be wrong in either direction. Ask the environmental health team for the current position at the address rather than relying on a general map, and remember that constraints can lapse, expire or be revoked without anything visible changing on the ground.

The Environment Act 2021 changed how breaches are dealt with in England. Emitting smoke from a chimney in a smoke control area moved from a criminal offence to a civil penalty issued by the authority, and selling unauthorised fuel for use in such an area became an offence in its own right. Penalty levels are set within a range fixed in regulations, so check the current figures with the council.

Authorised fuels and exempt appliances

Two routes exist and you need one of them.

Authorised fuels are smokeless by nature or by manufacture: anthracite, some semi-anthracites, low volatile steam coals and a list of manufactured solid fuels that Defra publishes and updates. Ordinary house coal is not on it. Neither is wood.

Exempt appliances are stoves, boilers and cookers that Defra has tested and exempted, each with conditions attached about which fuels may be burned in them. A Defra-exempt wood burning stove is the only lawful way to burn logs in a smoke control area, and the exemption applies to the specific model, not to the brand.

Check both lists before buying. The exemption is model specific and it can carry conditions about the fuel type, so a stove that is exempt for dry wood is not automatically exempt for anything else.

Two related rules apply whether or not you are in a smoke control area. Wood sold in volumes under 2 cubic metres has to be certified as having a moisture content of 20 per cent or less, and bagged traditional house coal is no longer sold for domestic use. New stoves sold in the United Kingdom have had to meet Ecodesign emission and efficiency requirements since January 2022.

Flue height and where the terminal goes

Flue position is a Building Regulations matter, governed by Approved Document J. The requirements exist so that combustion products disperse rather than re-entering the building or the neighbour's.

The points that shape the design:

• The outlet should be at least 1 metre above the top of any opening into the building that lies within 2.3 metres horizontally of the flue.
• It should be at least 2.3 metres horizontally from the nearest point of a roof window or other opening.
• Where the flue passes within 600 millimetres of the ridge, it should terminate at least 600 millimetres above the ridge.
• Adjoining and adjacent buildings, including a neighbour's dormer, count as well as your own.

Take the current dimensions from Approved Document J rather than from this list, because the document is revised. The practical consequence is that a flue on a low rear extension often has to be taller than the homeowner expects, and the height is the thing that turns a discreet installation into a visible one.

Why the fuel rule is not a planning matter

Planning controls the use and appearance of land and buildings. It does not control what you put in a stove, and a condition attempting to do so would fail the necessity test because the Clean Air Act already covers it.

The exception is where combustion affects air quality at a scale the planning system does address. In an Air Quality Management Area, or on a larger development with a biomass boiler or a communal energy centre, the council will expect an assessment of emissions and may condition the plant specification and stack height. That is Air Quality Assessment territory and councils expect a suitably qualified author, with professional review strongly advised. A single domestic stove is not.

Do not expect the case officer to advise you on fuel. Most will not know whether the address is in a smoke control area, and it is not their job to check.

Flues on listed buildings and in conservation areas

Installing or altering a chimney or flue on a house is generally permitted development under Class G of Part 1 of Schedule 2 to the GPDO 2015, subject to two conditions that matter here. The flue must not exceed the highest part of the roof by more than 1 metre. And on article 2(3) land, which includes conservation areas, National Parks, National Landscapes and World Heritage Sites, it must not be installed on a wall or roof slope that fronts a highway and forms the principal or a side elevation.

So a stainless steel flue on a rear roof slope in a conservation area is usually permitted development. The same flue on the front is not.

Listed buildings are different again. Listed building consent is needed for works affecting the character of the building, and a new flue almost always does, whether it runs internally through historic fabric or externally up an elevation. The application has to deal with what is being cut through, whether an existing flue could be relined instead, and how reversible the work is. Curtilage structures are caught too, and what the listing actually captures surprises owners of outbuildings and garden walls.

Illustrative example. A Victorian terrace in a conservation area has a blocked original chimney serving the rear reception room. Relining it and fitting a Defra-exempt stove needs no planning application, because nothing new appears on the elevation, and it satisfies the smoke control rules provided the exemption covers dry wood. A new external flue on the front elevation would need permission and would probably be refused. The scenario is illustrative.

Complaints and what the council can do

Complaints about smoke go to environmental health rather than to planning. Officers can investigate under the smoke control regime where the property is in such an area, and under statutory nuisance powers in the Environmental Protection Act 1990 where the smoke amounts to a nuisance.

In practice most complaints are resolved by advice about fuel, moisture content and how the appliance is being run. Wet wood and slumbering a stove overnight cause more complaints than the appliance itself.

What to put in the design statement

Where an application is needed, keep it short and answer the visual question. Show the flue on an elevation at the correct height and diameter, state the finish, and say where it can be seen from in the street. A Design and Access Statement should explain why the position chosen is the least harmful available and what alternatives were rejected, and on a listed building it needs a heritage assessment of the fabric affected.

Then separately, and before you buy anything, confirm the smoke control position and pick an appliance from the exempt list.

This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.

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