Do I need planning permission for air conditioning in Essex?

The short answer is that most Essex homes can have air conditioning fitted without applying for planning permission. The rules that make this possible are called permitted development, and they come with conditions worth knowing before your survey.

Since December 2011, installing an air source heat pump, which includes the reversible, heat-and-cool systems we fit, on a house or within its garden has been permitted development across England, provided every condition below is met. This comes from the Planning Portal's official guidance on air source heat pumps (opens in a new tab), which is the national reference for these rules.

The main conditions are:

• The installation must meet the Microgeneration Certification Scheme Planning Standards (MCS 020a).
• The outdoor unit, including its housing, must be no larger than 1.5 cubic metres on a house, or 0.6 cubic metres on a block of flats.
• A detached house can have up to two units installed as permitted development. A house that is not detached, or a flat, is normally limited to one.
• There must be no existing wind turbine on the property.
• The unit must not go on a pitched roof. On a flat roof, it must sit at least one metre from the roof's edge.
• The unit must not be used solely for cooling. Because every system we fit also heats, this condition does not rule out air conditioning, it rules out cooling-only units.
• The unit should be sited, as far as practical, to limit its effect on how the building looks and on the surrounding area.

Permitted development rights do not apply at all within the grounds of a listed building or a scheduled monument. In that case, you need full planning permission, and for a listed building, listed building consent as well, regardless of the unit's size.

In a conservation area or World Heritage Site, the outdoor unit must not go on a wall or roof that fronts a highway, and it must not be nearer to that highway than the building itself. Outside a conservation area, the same wall cannot be used above ground floor level if it fronts a highway.

A council can also remove permitted development rights for a specific street or area using what is called an Article 4 Direction. This is uncommon, but it is worth a quick check with your local council if your street has particular restrictions, especially in Essex's older town centres and conservation areas.

Permitted development is about whether you need a planning application. It does not remove the separate requirement to meet Building Regulations, which cover things like the electrical connection and the standard of installation work. The Planning Portal's own guidance recommends using an installer who belongs to a recognised scheme, such as the Microgeneration Certification Scheme or a government-approved Competent Person Scheme, partly so that this side of the work is covered without a separate council inspection. We are F-Gas REFCOM registered and our electrical work is carried out to NAPIT Part P standards, which our guide to F-Gas registered installers covers in more detail.

When we survey your home for an air conditioning installation, we look at where the outdoor unit can go within these rules: a wall or ground position that keeps it under the size limit, away from a pitched roof, and clear of any conservation area restriction on your street. If your home is listed, or you are not sure whether an Article 4 Direction applies, we will tell you so you can check with your council before booking any work.

This guidance covers the planning regime for England. If you live in Wales, the rules may differ, so check with your local planning authority.

If you are planning air conditioning for a new garden room, loft conversion or extension rather than an existing room, the planning position for the room itself, and for the outdoor unit, often needs thinking through together. Our garden room air conditioning guide covers typical placement and sizing, and our full price list shows what each package and size costs once you know which room you are cooling and heating.