Air Conditioning Installation London

What type of air conditioning works best in a London flat or office?

For most London homes and small offices, a wall-mounted split system is the right starting point: one indoor unit per room, connected to an outdoor unit by refrigerant pipes. Where outdoor space is limited, a multi-split system runs several indoor units from a single outdoor unit.

Portable units that vent through a window are cheaper to buy but noisier, less efficient and only practical for occasional use. A fixed system is quieter indoors, controls temperature properly and, on many models, also works as a heat pump to provide heating in winter.

Why must air conditioning be installed by F-Gas certified engineers?

Air conditioning systems use refrigerants that are fluorinated greenhouse gases, and it is against the law to work with them without the correct qualifications. That covers installing, servicing, repairing and recovering refrigerant from the system.

Our installation is carried out by F-Gas certified engineers. During commissioning they pressure test the pipework, evacuate it to remove air and moisture, then release or add refrigerant to the correct charge. Poorly made joints or skipped steps can lead to leaks, reduced performance and early compressor failure, which is why refrigerant work is never something to cut corners on. GOV.UK sets out the qualifications required to work with F gas.

The electrical side matters too. Most systems need a dedicated supply from the consumer unit, which should be installed and tested to BS 7671. If your fuse box is old or has no spare capacity, an upgrade may be needed first; see our consumer unit replacement service.

Do you need permission to install air conditioning in a London flat?

Often, yes. In a leasehold flat you will usually need written consent from the freeholder or managing agent, because the outdoor unit, the pipe route and the hole through the external wall typically affect parts of the building you do not own. Planning permission may also be needed, depending on the building and its location.

• Your lease: check the alterations clause. External walls, roofs and balconies are commonly retained by the freeholder, so consent is normally a condition of any work.
• Conservation areas: many London streets fall within conservation areas, where visible external equipment is more likely to need planning permission, especially on front elevations.
• Listed buildings: any alteration affecting the character of a listed building may need listed building consent, including drilling through historic fabric.
• Noise: outdoor units close to neighbours’ windows can raise noise concerns, and councils may consider this when deciding applications.
• Renting: tenants need the landlord’s written consent before any installation.

Rules vary by borough and by building, so check with your council’s planning team before you commit. After the site survey we can provide the equipment details, including model, size and manufacturer noise data, and the proposed positions, to support your consent or planning application.

What happens during an air conditioning site survey?

The survey turns a rough idea into a specific, buildable design and a fixed written quote. The engineer looks at:

• the size of each room and its heat gains, such as large south-facing windows, top-floor positions under a roof, or office IT equipment
• where the indoor units can go for even airflow without blowing directly onto beds or desks
• where the outdoor unit can sit: a wall bracket, flat roof, balcony or ground-level base
• the pipe route between indoor and outdoor units, and how condensate water will drain
• the electrical supply and spare capacity in the consumer unit
• access for equipment and working at height, including stairs, lifts and parking

You receive a written quote setting out the system, unit sizes and positions, and what is included. In London flats we often find that the most practical position for the outdoor unit is a rear elevation or roof rather than a balcony, because it is less visible and further from neighbours’ bedrooms, so it is worth keeping an open mind until the survey.

How is air conditioning installed?

A single split system can often be installed in a day. Multi-split and office systems take longer, depending on the number of units and the pipe routes.

1. The indoor unit is fixed to the wall or ceiling and the external wall is core drilled for the pipework.
2. Refrigerant pipes, the condensate drain and the control cable are run in neat trunking or concealed where possible.
3. The outdoor unit is mounted on brackets or a base with anti-vibration feet.
4. The pipework is pressure tested, evacuated and charged, and the electrical connection is completed and tested.
5. The system is commissioned, and you are shown how to use the controls and clean the filters.

What affects the cost of air conditioning installation in London?

Every installation is quoted after the survey, because the main cost drivers are specific to each property. The number of indoor units and their capacity matter most, followed by the length and complexity of the pipe run, the outdoor unit position, any electrical upgrades and access. A third-floor flat with the outdoor unit on the roof costs more to install than a ground-floor room with a short run to the garden. Request a survey through our quote form.

How should you look after the system after installation?

Clean the indoor filters regularly and have the system serviced in line with the manufacturer’s recommendations, usually once a year. Larger systems may also need periodic leak checks by law, depending on how much refrigerant they hold. In commercial premises, new air conditioning changes how the building is assessed for its energy rating, so a fresh commercial EPC after installation keeps your records accurate.