Single-room installs: often finished in half a day
A standard split aircon in one bedroom, study or small office usually takes about 3 to 5 hours once the team is on site. That assumes the mounting point is straightforward, the outdoor unit can sit close by, and there is already a suitable electrical point. If the wall is brick and the route is simple, the work can move quickly. If the unit has to pass through thicker walls, ceiling voids or awkward exterior access, add some time.
The biggest time saver is a clear plan before the installer arrives. We normally check where the indoor unit will sit, where condensate water will drain, and whether the outdoor unit can be mounted on a bracket or placed on a level pad. In many Johannesburg North homes, especially where the boundary wall is tight and the neighbour is close, the outdoor position must be chosen carefully so the unit does not create noise complaints later.
- Wall mount, piping and cabling on one level: about 3 to 4 hours
- Longer pipe run or tricky drilling: about 4 to 5 hours
- First-time install with new electrical work: allow most of the day
When a replacement is faster than a new installation
Replacing an old aircon is often quicker than fitting a unit from scratch, because the pipe route, drain route and sometimes even the bracket position already exist. A direct replacement can take 2 to 4 hours if the old unit is removed cleanly and the new one is similar in size. The team still needs to check the pipe condition, insulation and cable rating before reusing anything.
If the old unit has failed because of a leak, poor drainage or electrical damage, the time can stretch. We have seen homes in Randburg and Sandton where the previous install was done years ago, and the new fit needed extra work because the old hole was in the wrong place or the bracket had rusted. Coastal humidity is not the issue in Gauteng, but corrosion still happens around exposed fixings and outdoor supports.
- Old unit removed and new unit fitted in the same position: 2 to 4 hours
- Old piping reused after testing: add time for checks
- Bad bracket, damaged wall, or cable upgrade: allow a full day
Multi-room homes need more planning than people expect
A multi-room home installation can be done in stages, especially where two or three bedrooms are being fitted on the same day. In that case, the work may take a full day or longer, depending on how many indoor units are being installed and where the outdoor units will go. A typical three-room job in Midrand or the East Rand often needs 6 to 10 hours on site, sometimes split across two visits if the electrical work or core drilling is not straightforward.
The key issue is not only the number of units, it is the way the piping and wiring move through the building. Ceiling access, roof spaces, double-storey layouts and long runs to the outdoor area all add labour time. For houses with body corporate rules or strict estate rules, the team may also need to work within permitted hours, which can affect scheduling. That is common around Sandton apartments and some Randburg complexes.
- Two-room home install: usually half a day to a full day
- Three-room home install: usually one full day
- Double-storey or estate property: allow extra time for access and approvals
Commercial aircon jobs start with a site survey
Commercial installations take longer because the planning matters as much as the fitment. A small office suite may still be installed in one day, but larger spaces need a site survey first so load, pipe routes, power supply and drain points can be checked properly. That is especially important for offices in Johannesburg North where staff still need to work while the fitment is going on.
For a basic office install with one or two indoor units, the site visit and fitment may be done in a single day. For a larger space, the process may take several days from survey to completion. If the building has restricted access, working hours rules, or no easy ceiling voids, the installer will need more time. In some cases the project also needs coordination with an electrician or building manager before any drilling starts.
- Small office suite: often 1 day including fitment
- Larger office or retail area: 1 to 3 days, depending on access
- Multi-floor or high occupancy site: survey first, then phased installation
What can add hours to a job on the day
Even a simple install can run longer if the site is not ready. Missing electrical points, hard concrete walls, a blocked drain route or poor outdoor access all slow things down. Load-shedding can also interrupt testing, so the team may need to return when power is stable enough to complete the commissioning. This is common across Gauteng, and it is one reason we advise clients to book earlier in the day if possible.
Preparation helps a lot. If furniture has been moved away from the wall, pets are secured, and the outdoor area is clear, the installer can get to work straight away. On the other hand, if the team has to move cupboards or cut through packed storage first, the job takes longer. A good installer will still do the work carefully, but it is best to plan for the unexpected rather than assuming the first estimate is exact.
- Power interruptions during testing
- Extra drilling through hard brick or concrete
- Unsafe or inaccessible outdoor mounting points
- Changes to the chosen unit size or position on site
A practical Johannesburg example of timing
Take a home in Johannesburg North with one bedroom aircon and one small study unit. If the indoor positions are already agreed, the outdoor unit can be mounted safely, and the electrical supply is ready, the team may finish before late afternoon. That same job in a townhouse complex with limited parking, shared access and body corporate rules can take longer simply because setup and access take more time. The actual fitting is only part of the day.
For office clients in Sandton or Midrand, the timing question is often about disruption. A small office may be able to have work done before staff arrive, or after hours, while a bigger premises may need a phased plan so business can carry on. The main thing is to match the installation schedule to the site conditions, not only the number of units.
That is why we ask the right questions before the booking is confirmed. It saves repeat visits and helps the client know whether to set aside a morning, a full day or multiple days.
