A straightforward single-room split in a UK house, surveyed and installed by an F-gas certified company, often sits in the high hundreds to the low thousands of pounds in 2026 illustrations, including VAT, when the outdoor unit is close, the drain falls by gravity and the electrics are simple. That is an illustration, not a national tariff. Pipe length, a condensate pump, a new circuit, scaffolding and London access move the same badge by more than the difference between two respectable brands. Survey the room before you compare prices. The installer who commissions and returns matters more than the fascia.
A matched pair, a drain and a supply
You are buying a matched indoor and outdoor unit, pipework, a drain, an electrical supply, brackets or a slab, vacuum and charge, and commissioning. The cooling kilowatt has to match the room, the glass and the hours you use it. A cheap head that is too small is not a saving in August. Refrigerant work is for a certified company under the GOV.UK F-gas rules. DIY kits and marketplace pre-charged lines are the wrong purchase path for a house. Warranty registration usually follows the installer, so a firm with no service van in your county is a cost you pay later. Survey first: load, wall, drain, electrics, neighbour noise. Get the outdoor position and the drain written down. Most reputable firms will not warranty a machine they did not supply and survey.
A run of a few metres through a cavity is the easy case. A route across three rooms, a pump up to a soil stack, trunking you want hidden, and a consumer unit with no spare way are each extra. Flats add consent and sometimes scaffold. Listed buildings add delay before anyone drills. Cities add parking, permits and time. A first-floor outdoor unit on a pavement elevation can cost as much in access as the equipment. Two quotes hundreds apart are often looking at different walls, not different bargains. Force the same kilowatt, the same position and the same drain onto both. High hundreds to low thousands is a 2026 illustration for a simple house job. Access, pumps and long pipes move the figure more than the logo.
Electricity after the install price
The install price is not the electricity. A modern split moves more heat than the electrical kilowatts it draws, so a bedroom held for an evening is often a modest number of kilowatt-hours. Multiply those units by the rate on your bill. Energy Saving Trust describes these machines as air-to-air heat pumps when they heat as well. Filters, a choked outdoor unit and a setpoint you never raise will cost more over a summer than the badge premium you argued about in spring. Budget a service. It is cheaper than a heatwave callout for a blocked drain. The Planning Portal air source heat pump notes still apply to where that outdoor unit sits.
Frequently asked questions
Is there a standard UK price for one room?
No. A simple surveyed install is often illustrated in the high hundreds to low thousands in 2026. Access, drains, electrics and where you live move it. Treat any single number on a leaflet as a starting story.
Why are two quotes so far apart?
Usually the outdoor position, the pipe route, a pump, the electrical board or who is registering the warranty. Compare those lines before you compare brand names.
Can I buy the unit and pay someone only to fit it?
Most reputable firms will not warranty a machine they did not supply and survey. Refrigerant connections still need an F-gas certified company.
Core buying guides
Start with these high-intent guides, then dig into the rest of the library.
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.