Installing air conditioning in a UK home typically costs between £1,800 and £8,500 depending on the number of rooms, the system type and how easy the install is. The single biggest factor is whether you fit a single split (one indoor unit) or a multi-split serving several rooms from one outdoor condenser.
What's included in an installation quote
A proper quote should cover the indoor and outdoor units, refrigerant pipework (usually 3–5m as standard), electrical connection, wall brackets, condensate drain, a F-Gas commissioning certificate and VAT. Anything missing here is a red flag.
Single-room vs whole-home pricing
A single 2.5kW split serving a bedroom or home office is the cheapest route in at £1,800–£2,800 fitted. Whole-home multi-splits (3–5 rooms) land at £5,500–£8,500 because of the larger condenser, longer pipe runs and extra commissioning time.
What pushes installations over budget
Long pipe runs over 5m, listed buildings, high-level access (scaffolding), full re-decoration of routed walls, and undersized consumer units that need an upgrade. Always ask the installer to flag any of these on the survey, not after deposit.
How to get a fair price
Get 3 like-for-like quotes from F-Gas registered installers. Make sure every quote specifies the same kW rating, the same SEER/SCOP efficiency tier and the same pipe length. A £400 gap often disappears once you normalise these.
Typical UK installation cost by system size (2026)
| Single split; 1 room (2.5kW) | £1,800 – £2,800 |
| Single split; 1 large room (5kW) | £2,400 – £3,600 |
| Multi-split; 2 rooms | £3,800 – £5,200 |
| Multi-split; 3–4 rooms | £5,500 – £7,500 |
| Whole home; 5+ rooms | £7,000 – £8,500+ |
Prices include VAT, supply, fit and F-Gas commissioning. Surveyed properties only.
See what installers in your area would actually charge.
Get matched quotesFrequently asked questions
How long does installation take?+
A single split is usually a one-day job. Multi-splits take 2–4 days depending on pipe routing and how many indoor heads are fitted.
Do I need planning permission?+
In most cases no, but listed buildings, conservation areas and flats with shared external walls can need consent for the outdoor condenser.
Is VAT charged on AC installation?+
Yes; domestic AC installation is charged at the standard 20% VAT rate. Always confirm whether quotes are inclusive.