Air Conditioning

Split Air Conditioning Cost UK 2026

A single-room split system — one indoor head, one outdoor condenser — is the most common way to cool a UK home. Installed cost runs £1,500–£3,000 for a typical bedroom, home office or lounge, fitted in about a day.

£1,500–£3,000 installed1 room1 day on site

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The numbers

Split air conditioning cost by capacity — 2026

Capacity is chosen from room size. Oversizing costs more up front and more to run.

Capacity	BTU	Room size	Unit only	Labour	Installed total
2.0kW	~7,000	Small box room / study (up to ~10 sq m)	£500–900	£650–1,000	£1,300–1,900
2.5kW	~9,000	Bedroom / home office (up to ~14 sq m)	£550–1,000	£700–1,100	£1,500–2,600
3.5kW	~12,000	Lounge / master bedroom (15–25 sq m)	£650–1,200	£750–1,200	£1,700–3,000
5.0kW	~18,000	Open-plan / large room (25–40 sq m)	£800–1,500	£850–1,400	£2,000–3,600
7.0kW	~24,000	Very large open-plan (40+ sq m)	£1,100–2,000	£900–1,500	£2,400–4,200

Source: BestBuilders’ 2026 regional cost model (national cost guides × regional labour index), averaged across 519 UK towns.

What moves the price

What changes the cost

Cost factor	Typical impact	Why it matters
Pipe run length	+£150–400	Runs over ~5m need extra refrigerant pipe, insulation and labour; long vertical runs in flats cost most
Condenser siting & access	+£100–600	Ground level next to the room is cheapest; roof, height or scaffold access adds cost
Number of indoor units	+£700–1,500 each	Each extra head adds unit, pipework and commissioning time
Electrical work	+£150–500	A dedicated spur, consumer-unit way or isolator may be needed
Capacity (kW / BTU)	+£200–1,200	Oversizing wastes money up front and on running cost
Brand & range	+£400–800	Premium Daikin/Mitsubishi designer ranges vs value Samsung/LG
Making good	+£0–300	Trunking, core-drilling, plaster patching or repainting around the route

By region

Air conditioning cost by UK region — 2026

Labour rates and access drive most of the regional spread. Figures below are for a single-room split; the same percentages apply across the other system types, from a multi-split system to fully ducted air conditioning.

Region	Single-room split (installed)	vs UK average
London	£1,900–3,600	+25–30%
South East	£1,750–3,300	+15–25%
South West & East	£1,550–3,000	+5–10%
Midlands	£1,450–2,800	Baseline
North of England	£1,400–2,700	−5%
Wales & Scotland	£1,400–2,750	−5% to baseline

How it works

Getting it priced properly

1. Size it first

Capacity comes from room size, glazing and aspect — not from guesswork. An installer who quotes without asking about the room is guessing.

2. Check F-Gas registration

Anything touching the refrigerant circuit legally requires an F-Gas registered engineer. Ask to see it and check it on the register.

3. Compare like for like

Get three itemised quotes covering the same capacity, brand tier and pipe run, so you are comparing the job and not the wording.

Visual guide

Single-room split costs compared

Where this job sits against the other air conditioning jobs, on 2026 UK prices. Your own quote depends on size, access and spec.

Source: BestBuilders 2026 pricing across 7 air conditioning jobs. The highlighted bar is this page.

Common questions

Single-room split — frequently asked questions

How long does a split AC install take?

One indoor head and one condenser is a one-day job for a two-person team, assuming the condenser sits at ground level near the room and the pipe run is under about 5m. If the condenser has to sit on a first-floor wall or a flat roof, or the refrigerant pipe has to cross the house, allow a day and a half plus the extra pipework and labour shown in the table above. Fitting two or three rooms in one visit almost always works out cheaper per room, because the engineer only sets up, vacuums the system and commissions it once.

Does a split system heat as well as cool?

Yes. Every modern split is a reversible heat pump, so it heats in winter as well as cools in summer, typically at a SCOP of 4.0–5.1 depending on brand and model. In practice it returns roughly 4kW of heat for every 1kW of electricity it draws, so a split used for shoulder-season heating often costs less to run than the same warmth from a gas boiler. It will not replace central heating in a hard frost, but it takes the chill off mornings and evenings cheaply.

Do I need planning permission?

Usually not for a single external unit on a house within permitted development, but siting, noise and conservation-area status all matter. As a rule the outdoor unit should sit well clear of the boundary, be the smallest and quietest model that will do the job, and you should expect tighter rules on flats, listed buildings and Article 4 areas than on a typical house. Check the planning permission guide before you commit.

What does it cost to run?

A 2.5kW bedroom split draws 0.3–0.7kW cooling, which is roughly 7–20p an hour, or £30–70 across a UK summer at current electricity prices. Run for heating over the milder months it costs less per unit of warmth than a gas boiler thanks to that heat-pump efficiency, though one bedroom split will not heat a whole house through a cold snap.

Keep reading

Air conditioning cost 2026

Every system type priced side by side.

Running costs

What it costs per hour and per summer.

Planning permission

When an external unit needs consent.

Go deeper

Single-room split — guides and detail

The detail behind the number: what changes the price, the planning position, and how to check a quote before you accept it.

Split AC cost calculatorPrice a single-room split by capacity, pipe run and brand.See costs & get quotes →

Registered members: Air Conditioning

7 businesses offering air conditioning have a public profile with BestBuilders. Each listing is a business that registered with us directly; the details shown are the ones it declared at registration, and a Companies House number appears only where one was given.