Book a weekend install only after a weekday survey has already chosen the wall, the pipe run, the drain, the electrics and the outdoor spot. A single split in an ordinary house can then be a one-day job. A multi-split, a board change or wet plaster will not be finished because the calendar says Sunday. The circuit is still F-gas work. Do not skip the survey to catch a Saturday slot.
One surveyed pair on a Saturday
One indoor unit, one outdoor unit, a short pipe run and a gravity drain, with the circuit already allowed for on the consumer unit, is the job that fits a Saturday. The crew needs the survey measurements, the model codes on site, and a clear path through the house. If the outdoor unit has to come through a terrace with no side access, say that before they load the van.
Plaster that is still wet on Monday
Making good is the part that slips. A core-drilled hole can be sleeved and sealed on the day. Skim plaster and paint may still be drying on Monday. Agree what finished means: a commissioned system, or a commissioned system plus redecorated walls. Dust, an open consumer unit or wet plaster may mean the house is not fully usable that night. Ask what they will protect and what you will still see on Sunday evening.
Consent and a full consumer unit
Consent does not appear because you are at home. A flat, a listed building or a conservation area still needs the outdoor unit to be lawful under Planning Portal conditions in England, or to have the consent those conditions do not replace. A freeholder who has not replied is a reason to move the date, not a reason to drill.
What has to already be true before Sunday
Electrical capacity does not appear on a Saturday morning either. If the survey said the board is full, the electrician's visit is part of the plan, not a hope that a spare way will turn up. Refrigerant is handled by an F-gas certified company on the day they commission, which may be the install day only if the pipes are ready. Commissioning and the refrigerant record are the end of the job whichever day it falls on. A unit that is only hung is not a finished install.
- Survey on a weekday, install on the weekend.
- One surveyed pair is the realistic Saturday job.
- Parts have to be in the van, not on order.
The neighbour, the van and the drill
Drilling and a van are louder than the finished unit. Tell the neighbour before a Saturday start, and check whether the lease or the close has quiet hours that block power tools. Parking for a van with an outdoor unit in it is part of the visit. A permit street with no space is how a one-day job becomes a carry from two roads away.
A crew standing in the hall
As a 2026 illustration, a weekend slot is often the same installed price as a weekday, or a modest uplift, once the job was already surveyed. The expensive version is a crew standing in the hall while someone redesigns the drain. That is the cost the survey is there to avoid. Give the Saturdays you can offer access, any parking limit, and whether someone will be home all day, with photos of the indoor wall, the outdoor spot and the consumer unit. The quote should state the model codes, how long the crew will be there, and what will be left unfinished if plaster is involved. The balance is due when the system is commissioned, not merely when the van arrives.
Frequently asked questions
Can they survey and install on the same Saturday?
Only for the simplest ground-floor room where every route is obvious and the parts are already the right codes. If the drain, the board or the outdoor spot is in doubt, split the visits.
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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.