As a broad July 2026 budgeting range, a straightforward single-room wall-mounted split installation in the UK may cost about £1,500 to £3,000 including VAT, while comparable London work may more often fall around £1,800 to £3,500. Complex pipe routes, difficult access, premium equipment, electrical upgrades and planning or building constraints can push the price higher. These are indicative consumer budgeting ranges, not tariffs, so obtain a written site-specific quote and confirm exactly what is included.
Typical installed price ranges
For a small domestic room, the normal starting point is one indoor wall unit connected to one outdoor condenser. In July 2026, a simple installation may be budgeted at roughly £1,500 to £3,000 including VAT across much of the UK. London labour, parking, access and logistics can move a similar job towards roughly £1,800 to £3,500.
Larger or high-specification systems can cost considerably more. Two or three rooms may require separate split systems or a multi-split arrangement, often taking the project into several thousand pounds. A survey is needed because room size alone does not establish the required capacity.
- Ask whether VAT, delivery, commissioning and waste removal are included.
- Check the stated make, model, output and warranty rather than comparing headline totals.
- Treat any price given without a survey or detailed questions as provisional.
What changes the final cost
Short, accessible pipework through an external wall is usually the least expensive arrangement. Long refrigerant runs, condensate pumps, roof access, scaffolding, core drilling through difficult materials and concealed services all add labour or materials.
The electrical supply may also need work. The installer should state whether a new circuit, isolator, consumer unit change or electrician visit is included. Noise-sensitive locations, restricted outdoor-unit positions and landlord requirements can affect both design and price.
Cooling-only versus reversible systems
Many modern split air conditioners are reversible air-to-air heat pumps, meaning they can cool in summer and provide heat in cooler weather. A cooling-only unit cannot be assumed to have the same planning treatment or seasonal usefulness.
In England, the permitted development provision commonly discussed for domestic air source heat pumps includes a condition that the unit must not be used solely for cooling. A cooling-only system does not satisfy that Class G condition, while a reversible system still has to meet every other limit and condition. Planning rules, property restrictions and technical standards should be checked for the actual proposal.
How to budget without surprises
Request a written scope showing equipment, pipe length allowance, trunking, condensate route, outdoor mounting, electrical work, controls, commissioning and making good. Ask what event would create an extra charge.
Running cost also matters. Compare efficiency labels and seasonal performance, but remember that actual electricity use depends on weather, set temperature, insulation, glazing, occupancy and usage hours. A slightly cheaper installation is not necessarily cheaper over the system's life.
Frequently asked questions
Why does air conditioning cost more in London?
Parking, congestion, restricted working hours, difficult access and higher labour overheads can all contribute. The effect varies by site, so a London postcode alone should not justify an unexplained premium.
Can I get an accurate price from room dimensions?
Dimensions help, but a proper selection should also consider glazing, orientation, insulation, occupancy, equipment heat gains and the proposed pipe and condensate routes.
Is VAT normally included in advertised prices?
Not always. Ask for a VAT-inclusive total and check whether electrical work, access equipment, commissioning and disposal are included.
Related guides
Sources and further reading
How this guide was prepared
This guide was written by the Local AC Installers Editorial Team. We compare official guidance, legislation and established consumer information, separate general information from project-specific advice, and show publication dates and sources. We do not accept installer accreditation claims at face value.