Heating · Updated 2026
Air conditioning installation cost
Typical range£300–£12,000· Average single split AC system (one room)
Home air conditioning costs for 2025 — split, multi-split and portable. In the UK, expect to pay between £300 and £12,000, with the typical project around £1,800 (average single split ac system (one room)). Regional variation, specification tier and site access conditions all shift the final quote.
Quick answer: Air conditioning installation cost in the UK typically costs between £300 and £12,000 (Average single split AC system (one room)). London and the South East run 20–35% above this range; the North, Wales and most of Scotland sit 5–15% below.
Homeowners researching this typically also price up . For wider context, browse our bathroom pricing, kitchen pricing and trades day rates.
Cost table
Indicative price ranges (UK, GBP)
| Item | Typical range (GBP) |
|---|---|
Portable AC unit (no install) — No installation, vent through window | £300–£700 |
Single split system (one room) — Wall-mounted indoor + outdoor unit | £1,200–£2,500 |
Dual split system (two rooms) — One outdoor, two indoor units | £2,000–£4,500 |
Multi-split system (3–5 rooms) — One large outdoor unit, multiple rooms | £4,000–£10,000 |
Cassette unit (ceiling-mounted) — Commercial-style, ceiling flush | £2,000–£5,000 |
Labour costs
Labour typically accounts for 40% of the total project cost in the UK.
Labour line items
| Item | Typical range (GBP) |
|---|---|
F-Gas engineer (per day) | £250–£450/day |
Pipework (per metre) | £20–£45/m |
Electrical connection | £150–£400 |
Materials costs
Materials and fittings make up the remainder of the budget, with specification tier driving most of the variation.
Materials & fittings
| Item | Typical range (GBP) |
|---|---|
Split system (2.5kW, single) | £700–£1,200 |
Multi-split outdoor unit | £800–£2,500 |
Indoor cassette unit | £500–£1,500 |
Refrigerant pipework (per m) | £15–£30/m |
Factors affecting cost in the UK
- ·Region — London and the South East run 15–30% above national averages.
- ·Specification tier — premium materials and finishes can double the base cost.
- ·Access and site conditions — flats, restricted parking and listed buildings add time.
- ·Scope changes mid-project — late design decisions are the biggest cost overrun driver.
- ·Trade availability — quotes rise 10–20% in peak spring and summer months.
Ways to reduce cost
- ·Choose a single multi-split system over multiple monosplits for lower install cost.
- ·Specify mid-range Mitsubishi, Daikin or Panasonic rather than premium designer brands.
- ·Site the outdoor unit on the ground rather than wall-mounted to avoid scaffold.
- ·Combine AC install with planned electrics or extension works to share labour.
- ·Use an F-gas registered installer with installation included rather than separate trades.
Frequently asked questions
- Do I need planning permission to install air conditioning?
- An outdoor condenser unit is usually permitted development for most domestic properties, provided it is not on a wall or roof fronting a road, is not in a conservation area, and doesn't exceed certain dimensions. Listed buildings require consent. Scotland has slightly different rules.
- Can air conditioning also heat a room?
- Yes — most modern split AC systems are reversible heat pumps that can both cool in summer and heat in winter. They are far more efficient than electric resistance heaters and can provide effective heating down to -15°C or lower (in modern units).
- How much does air conditioning cost to run?
- A 2.5kW split system running for 8 hours costs approximately £5 at 25p/kWh. With a CoP of 3–4 in heating mode, the cost per unit of heat is far lower than direct electric heating.