Air Conditioning Installation Cost
£1,580–£3,000One room, wall-mounted split system, supplied and fitted. Last updated October 2026.
A wall-mounted split system for one room costs about £1,580 to £3,000 supplied and fitted. Multi-room and ducted systems start around £4,500 and can pass £10,000. Every job is priced on survey. Air conditioning engineers who do air conditioning installations
What each option costs
| Type | Typical cost | Notes |
|---|---|---|
| 12,000 BTU wall-mounted split system | £1,580–£2,300 | Checkatrade, quoted by MoneyWeek: unit £620 to £900, plus labour |
| Wall-mounted split system, per room | £1,750–£3,000 | Typical supply-and-fit price, ClearScore |
| Multi-split or ducted, several rooms | £4,500–£10,000 | ClearScore; the top figure is given as £10,000+ |
What affects the price
- Brand, unit size and how many rooms
- Length of pipe run between indoor and outdoor unit
- Wall type, outdoor unit position and electrical supply
- Whether the system is wall-mounted, multi-split or ducted
What’s included
- The indoor and outdoor units
- Pipework, wiring, condensate drain and commissioning
- Fitting by an F-Gas certified installer
Good to know
How long does it take? ClearScore, citing Checkatrade, puts a single unit at roughly one day and a multi-room system at up to a week.
Do I need one? Fitting a split system is work on a refrigerant circuit, so it must be done by an F-Gas certified engineer.
Before you book, read how to check a tradesman is legit.
How to pay less
- Fit one multi-split outdoor unit instead of several single systems
- Get quotes that name the unit, pipe length and any wall or electrical work
- Ask whether the quote includes the first service
Sources
What would yours cost?
We'll tell you the price for this, then find a local air conditioning engineer to do it.
Get a quote
