Installation · 5 min read
How Long Does Air Conditioning Installation Take?
Most single-room installations are a one-day job. Here is what changes that, and how to plan around it.
Published 2026-07-21 · Updated 2026-07-21 · WDI Group (Surrey) Ltd
Single-split systems
One indoor unit and one outdoor unit, with a short straightforward pipe run, is typically a single day on site including commissioning and handover.
If the outdoor unit is at ground level directly behind the indoor unit, it can be quicker than that.
Multi-room and multi-split systems
Two to three indoor units usually take one to two days. Four or more, or a multi-split running from one condenser with long pipe routes, is commonly two to three days.
Where pipework is concealed within a renovation, we often attend twice: first fix before plastering, second fix when decoration is complete.
- 1 room: typically 1 day
- 2–3 rooms: typically 1–2 days
- 4+ rooms or concealed routes: typically 2–3 days, sometimes split visits
What makes a job take longer
Long or awkward pipe runs, solid masonry, listed or period fabric, scaffolding or access equipment, condensate that will not drain by gravity and therefore needs a pump, and electrical upgrades all add time.
Flats add logistics: lifts, permissions, restricted working hours and shared external walls.
Planning your week around it
Book the survey early — lead time to the installation date is usually longer than the installation itself, particularly in May and June when demand spikes.
Installing in autumn or winter often means faster availability and gives you the heating benefit immediately.
Frequently asked questions
- Can you do it while I am at work?
- We need access and someone present for handover, but many customers arrange access in the morning and return for the demonstration.
- How far ahead should I book?
- Book the survey as soon as you are considering it. Peak-season installation slots fill weeks ahead.