The published single-split band assumes a wall-hung unit on an external wall with a short pipe run. A loft conversion changes every one of those assumptions.
A typical UK single-room split lands at £1,800 to £3,200 installed. A loft conversion sits at or above the top of that band. The indoor unit sits under a sloped ceiling. The condenser usually needs a roof bracket, not a ground pad. The pipe and condensate run is longer than the baseline. The hardware is no more costly. The install around it is.
The baseline assumes an external wall mount with a 3 to 5 metre pipe run. A loft conversion usually needs a longer run to a roof condenser. Bracket and weather costs are not in the baseline.
Indoor unit choice is the design question. A high-wall split rarely fits a sloped ceiling. A slim ducted unit or a ceiling cassette is often the only fit.
Confidence shifts from medium to low until the condenser mount is agreed. Roof bracket loads and condensate routing can move the price.
Confirm the roof can take a condenser bracket at the rafter spacing.
Find a condensate route that does not cross the rafter insulation.
Pick between a high-wall split, a slim ducted unit and a ceiling cassette before pricing kit.
Structural work to rafters to take a condenser bracket.
Re-routing condensate pipework through finished plasterboard.
Reinstating insulation disturbed by the indoor unit chase.
Have an installer survey the rafter line and the bracket spot before any fixed price.
A loft AC quote at the baseline figure often means the installer has assumed a ground condenser the roof cannot take. Confirm the condenser spot and the pipe route before the quote. The price then holds up at the survey.
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