How Much Does AC Installation Cost in the UK? 2026 Price Guide

British housing was built to keep heat in, which is why a 30°C week in a south-facing bedroom under a slate roof is unbearable. Prices have climbed hard since 2022 — not because the kit costs more, but because there are only so many F-Gas certified engineers, and every one is booked from May to September.

The figures below are supply and fit, from quotes seen across England, Wales and Scotland in early 2026. The same 3.5kW unit can differ by £900 between a Cheshire installer in April and a London one in July.

Most jobs land in one of five brackets. The biggest jump is from one indoor unit to two: a multi-split needs a larger condenser and far more pipework.

• •Portable unit, no installation — £250 to £600, and 3 to 4kWh a day to run
• •Through-wall monobloc, sealed, no outdoor condenser — £1,300 to £1,900 fitted
• •Single split, one room, 2.5kW to 3.5kW — £1,800 to £2,800 fitted
• •Multi-split, two to three rooms — £3,200 to £5,200 fitted
• •Four rooms up — £5,500 to £9,000; loft-void ducted systems £9,000 to £15,000

A quote should resolve into these lines; one number with no detail is your first warning sign. Capacity matters more than the brand badge — an oversized unit short-cycles and never dehumidifies — so work through our method for sizing an air conditioner first.

• •Kit, budget tier (Gree, Midea, Fujitsu General) 3.5kW — £450 to £750
• •Kit, premium tier (Daikin, Mitsubishi Electric, Panasonic) — £750 to £1,200
• •Two-person F-Gas team, one day — £400 to £650; £550 to £800 in London and the South East
• •Pipework beyond the first 3 to 5m — £25 to £45 per metre, insulated and trunked
• •Condensate pump where gravity drainage isn't possible — £90 to £160
• •New dedicated 16A radial from the consumer unit — £180 to £350; £450 to £750 if the board needs replacing
• •Brackets, plinth or anti-vibration feet £45 to £130; scaffold tower for a gable condenser £150 to £400

On a single split, expect roughly 40% equipment, 40% labour and 20% sundries — pipework, brackets, cable, trunking, drainage and commissioning. On a four-room multi-split the equipment share climbs towards 55%: four indoor heads, but not four days of labour.

Two costs people miss: the electrics are a separate trade, so check yours against our breakdown of electrician's rates, and making good is often excluded. VAT is the third trap — cooling-only kit carries the standard 20%, while some installers apply the 0% energy-saving materials rate to reversible air-to-air systems that also heat. Get it stated on the quote.

Two identical houses on the same street can be £1,000 apart. These are the levers that shift the number.

• •Number of indoor units — roughly £900 to £1,400 per additional head
• •Distance to the condenser — past 5m you pay metre rates, past 15m extra refrigerant charge
• •Condenser position — ground level by the back door is cheapest; eaves height adds scaffold and a second fitter
• •Wall construction — a 300mm cavity is routine, 600mm rubble-filled Victorian stone is not
• •Season and region — July runs 10% to 20% above February, London 20% to 30% above the North
• •Conservation area or listed status — consent, and a condenser location nobody wanted

Real jobs with the arithmetic shown, so you can see how a quote is built. If you are weighing cooling against something that also heats the house, our comparison of a heat pump versus an air conditioner sets out the ten-year running-cost maths.

• •1930s semi, Leicester — one 3.5kW split, condenser at ground level 2.5m away, new 16A circuit. Kit £680, labour £480, sundries £190, electrics £240. £1,590 plus VAT, £1,908 including.
• •Victorian conversion, South London — two-room multi-split, 8m run to a flat-roof condenser, condensate pump, tower hire. Kit £1,450, labour £1,180, sundries £430, pump £120, tower £220, electrics £310. £3,710 plus VAT, £4,452 including.
• •Four-bed detached, Milton Keynes — four-room reversible multi-split, all runs under 6m. Kit £3,100, labour £1,650, sundries £780, electrics £280. £5,810 plus VAT, £6,972 including.

In the UK this is a question of law, not confidence or tooling — and it decides a large slice of the cost.

A competent DIYer can do plenty: lay the paving-slab plinth, clear access, hire the tower, make good the plasterboard afterwards, and handle all servicing — filters monthly in season, coils annually. Our guide to cleaning an air conditioner covers that, and it saves £80 to £120 a year. A pre-charged sealed monobloc is also within reach with a hired 162mm core drill.

What you cannot touch is the refrigerant circuit. Under the Fluorinated Greenhouse Gases Regulations 2015, anyone installing or commissioning equipment containing F-gases must hold the relevant handling qualification, and the business must be certified with a body such as REFCOM, Quidos or Bureau Veritas. That covers brazing the lineset, nitrogen pressure testing, pulling a vacuum and releasing the charge. It catches the DIY split kits with pre-charged quick-connect couplings too: the coupling contains F-gas, venting it is an offence, and no manufacturer honours a warranty without a commissioning record.

The electrics have their own hard edge. A new dedicated circuit from the consumer unit is notifiable under Part P of the Building Regulations in England and Wales, so it must be done by a registered electrician under a competent person scheme or notified to building control first; Scotland and Northern Ireland are stricter, not looser. See our list of electrical jobs you should never DIY.

Two more stopping points. Condensers weigh 35 to 60kg, so anything above 3m needs a tower, not a ladder. And while air source heat pumps have permitted development rights in England, a cooling-only condenser on a front elevation or in a conservation area usually needs a householder application — check before the kit is ordered.

Get three quotes and reject any without a site visit — nobody specifies pipe runs from a photograph. Worth doing first, though: if the room overheats through single glazing and an uninsulated loft, cooling it treats the symptom at full price. Draught-proofing and insulation often takes 2 to 3°C off a summer peak.

• •Model numbers and kW output stated, not just "wall unit"
• •Pipe run length in metres, and the rate beyond it
• •The F-Gas registration number, verifiable on the certification body's register
• •Commissioning certificate, F-Gas logbook, electrical certificate and Part P notification included
• •Warranty terms in writing — most 5 to 7 year warranties lapse without an annual service at £90 to £150
• •Deposit no more than 25%, balance on commissioning

Figures come from written quotes and completed job costs gathered between January and June 2026 across the East Midlands, Greater London, the North West and central Scotland, cross-checked against trade merchant list prices. Labour assumes two-person F-Gas certified teams. Totals are given both excluding and including VAT at 20%, because installers quote inconsistently. We revise these bands each spring.