Installing Air Conditioning in a Flat: What You Need to Know

Installing Air Conditioning in a Flat

Air conditioning in flats is increasingly popular, particularly in upper-floor apartments that trap heat in summer. But there are a few extra considerations compared to a house. Here's everything you need to know.

Do I Need Permission?

If you own a leasehold flat (most flats in the UK), you'll typically need written permission from your freeholder or management company before installing air conditioning. This is because:

We recommend checking your lease and contacting your management company early in the process. Most are happy to approve installations, especially if the outdoor unit is positioned discreetly.

If you own a freehold flat or a share of freehold, you may have more flexibility, but it's still good practice to inform other residents.

Where Does the Outdoor Unit Go?

The outdoor unit needs to be placed somewhere with adequate airflow. Common options for flats include:

During our video survey, we'll assess your property and recommend the best location.

Noise Considerations

Living in a flat means you're closer to your neighbours, so noise matters. Modern outdoor units are designed to be quiet, typically operating at around 45-50 dB, roughly the same volume as a quiet conversation.

The Toshiba units we fit are among the quietest on the market. Indoor units operate at around 19-22 dB in quiet mode, which is barely audible.

The Installation Process

Installing AC in a flat typically involves:

1. Mounting the indoor unit on an interior wall, usually high up near the ceiling

2. Drilling a single hole (about 70mm diameter) through the external wall for pipework

3. Running pipework from the indoor unit through the wall to the outdoor unit

4. Mounting the outdoor unit on the balcony, wall bracket, or ground stand

5. Connecting the electrical supply and commissioning the system

The whole process usually takes 4-6 hours. We use dust sheets and clean up thoroughly afterwards.

Common Concerns

Will it damage the building? The installation involves one small hole through an external wall and some bracket fixings. This is comparable to installing a bathroom extractor fan and causes no structural issues.

What about pipework on the outside? Pipework is covered in white or grey trunking that blends with most building exteriors. We always aim for the neatest possible route.

Can I install AC in a rented flat? You would need your landlord's permission, and the installation would typically need to be approved as an improvement to the property. Some landlords welcome it as it adds value to the flat.

Costs

Air conditioning installation in a flat typically costs the same as in a house: from around £1,500 for a single room. The price may vary slightly depending on the outdoor unit location and pipework route.

Get a Quote

Request a quote and we'll arrange a survey for a fixed price. If you have a flat, we'll assess the best installation approach during a free video survey.