Typical fitting times
Checkatrade's air conditioner cost guide, updated in 2026, says a single air con unit should take roughly one day to install, while multi-room systems, larger homes and complex systems might take closer to a week. Those are fitting times. They don't include the survey, the wait for a slot or any consents. Our Leeds air conditioning installation cost guide breaks down a typical quote line by line.
Where your job falls in that range depends on how many indoor units there are, how long the pipe runs are, whether new electrics are needed and how easy it is to reach the outdoor unit's position. A back bedroom with the outdoor unit on the ground directly below is close to the simplest job there is. A three-bedroom multi-split in a Victorian terrace, with pipes run through a loft, is at the other end.
The full timeline, from survey to sign-off
Most people think of installation as the day the engineers turn up. In practice there are several steps before that, and some of them are out of the installer's hands.
- Survey: the installer visits to measure the rooms, agree positions and check the electrics.
- Quote: the written quote should give the model, capacity, price and the MCS 020 a) noise calculation.
- Consents: permission from a landlord or freeholder, and planning permission if the job falls outside permitted development.
- Booking: the date depends on the installer's diary and on the equipment being in stock.
- Fitting and commissioning: the day or days on site.
- Paperwork: commissioning records, warranty registration and the MCS certificate.
What happens on the day
For a single split unit, the day normally follows the same order. The engineer fixes the indoor unit's mounting plate, drills the hole through the wall for the pipes, cable and condensate drain, and mounts the indoor unit. The outdoor unit goes on a wall bracket or a ground pad, with anti-vibration mounts.
Next come the refrigerant pipes between the two units. Once they are connected, the engineer pressure tests the pipework and pulls a vacuum to remove air and moisture before releasing the refrigerant. This part needs someone with an F-gas certificate, and it shouldn't be rushed.
The electrical supply is wired in, usually with a dedicated circuit or fused spur and an isolator switch by the outdoor unit. Checkatrade notes that a fused spur indoors and an IP rated switch outdoors will be needed. Finally the engineer commissions the system, checks it heats and cools, sets up the controls and shows you how to use them.
What slows things down
These are the most common reasons a job takes longer than planned, or starts later than you hoped.
- Summer demand: hot spells bring a rush of enquiries, so diaries fill quickly.
- Long pipe runs or pipes routed through a loft or between floors.
- Access: a high outdoor position may need a tower or platform.
- Electrics: a new circuit or an older consumer unit that needs work.
- Consents still outstanding from a freeholder, landlord or the council.
- Stock of the particular model, especially quieter or higher capacity units.
Electrics can add time
The electrical side is the part most likely to change the plan on the day. Checkatrade lists the indoor fused spur and the outdoor IP rated switch as extra costs of £400 to £700, and says they are hard to price accurately in advance. That uncertainty is usually about the house, not the unit.
An older consumer unit with no spare way, a fuse box that needs replacing, or a long cable run to the outdoor position can each add hours. A new circuit has to meet the building regulations, which is normally handled by a registered electrician who can self-certify the work. The survey should include a look at your consumer unit so any of this is in the quote and the timetable, not a surprise.
Commercial installs
Offices, shops and other commercial premises follow a different pattern. Ceiling cassettes and ducted units need access above a suspended ceiling, and the work is often done out of hours so the business can keep trading. Larger systems may be phased over several visits. Planning is also more likely to be needed, as the permitted development rules for homes don't cover commercial buildings.
For a small office in Leeds city centre, the practical questions are the same as at home, just with more people to agree them: who signs off the outdoor position, when the power can go off and whether the landlord's consent is in place. Our commercial page explains what we cover.
A worked example: a three-room multi-split
Say you want cooling and heating in three bedrooms of a semi in Rothwell. On a semi, permitted development allows only one outdoor unit, so a multi-split with three indoor units is the usual answer. Checkatrade's range for multi-room systems runs up to about a week.
To see what that means for a quote, Checkatrade gives an average air conditioning labour cost of £450 a day, with day rates running from £280 to £720. If a three-room job took three days, the labour at the average rate would be 3 x £450 = £1,350, and at the ends of the range 3 x £280 = £840 or 3 x £720 = £2,160. These are national averages to help you read a quote, and aren't our partners' prices. The days on your quote will depend on the survey, and a good installer will explain how they arrived at them.
The same arithmetic helps you compare quotes. If one installer allows two days and another four for the same three rooms, ask why. The difference is often a pipe route or electrics that one of them has spotted and the other hasn't.
Time spent on the survey pays back on the day. If the pipe routes, drain points and electrics are agreed in advance, the engineers can get straight on with the work.
Leeds homes and timing
The type of house makes a real difference to how long the job takes. Leeds has about 19,500 pre-1919 back-to-back houses, according to the council. With only one outside wall, often facing the street, the pipe routes and outdoor unit positions are limited, which can mean longer runs through the house.
Stone-built terraces in places like Headingley and Chapel Allerton have thick walls, so the core drilling for the pipe hole takes longer than through modern cavity brick. Newer estates on the edges of Leeds and in towns such as Garforth and Morley tend to be quicker, with cavity walls and simple routes to the back garden.
If your home is in one of Leeds's 80 conservation areas, or is listed, allow time for planning or listed building consent before any fitting date. Our planning guide sets out when permission is needed.
Planning around the work
Clear the area under the indoor unit and around the outdoor position before the engineers arrive. Move furniture back from the wall and lift rugs if you can. Check there is parking for the van close to the house, which can be tight on terraced streets. Make sure someone can let them in to every room where work is planned, including the loft if pipes will run through it.
The power to the circuit will be off for part of the day while the electrics are connected. If you work from home, plan for that, and for some drilling noise in the morning.
If you want the system working for summer, book the survey in spring. Leeds summers are mild on average, with the Met Office giving a mean daily maximum of 21.4°C in July at Leeds Weather Centre, but hot spells are when most people start looking, and that is when diaries are busiest.
After the install
Before the engineer leaves, you should get the commissioning record, the manufacturer's warranty details and an explanation of the controls. For an MCS certified installation you should also receive an MCS certificate. Our partner installers are MCS certified, and the zero rate of VAT on domestic installations of air-to-air heat pumps runs until 31 March 2027 under HMRC's VAT Notice 708/6.
Most manufacturers ask for regular servicing to keep the warranty valid. Checkatrade puts a one-off service at £70 to £120 per unit. Our servicing page explains what a service covers.
Sources
Guidance is general and indicative. Always confirm details with a qualified F-Gas registered installer. Get a free quote.