Split System Installation Cost in Melbourne (2026 Guide)

A split system installation is an indoor head, an outdoor condenser, an insulated refrigerant pipe run and drain between them, a bracket or pad for the outdoor unit, the electrical connection, and the commissioning that makes the whole thing work. The unit itself is usually less than half the invoice on a standard job.

Most quotes are built around a standard installation, and it is worth knowing what that phrase usually means: an indoor head on an external wall, an outdoor unit on the other side of that wall or immediately below it, a pipe run of about three to four metres, a drain that can fall to a suitable point, mounting on brackets or a ground pad, and connection to an existing suitable circuit. Everything beyond that is priced as an extra, which is exactly why two quotes for the same model can differ by $800.

The other thing in the price is licensing. Refrigerant work requires an ARC licence, and the electrical connection requires a licensed electrician who issues a Certificate of Electrical Safety. On a proper split system installation both of those are covered by the one contractor, and both should be visible on the paperwork you receive.

Capacity is the first driver. Bedrooms generally take 2.5 to 3.5kW, medium rooms 3.5 to 5kW, open plan living areas 5 to 7.1kW, and large open plan or poorly insulated spaces 8 to 9kW. Sizing to the room rather than to the budget matters, because an undersized unit runs at full output all summer and never quite gets there.

These are indicative supplied and installed ranges for a standard back to back installation in a Melbourne home. They are a planning guide and a written quote after a site visit replaces them.

A multi split runs two or more indoor heads off one outdoor unit. It is the right answer when there is genuinely nowhere to put a second condenser, which on narrow inner west blocks and in townhouse developments around Seaholme is a real constraint, or when a body corporate limits how many outdoor units can go on a wall.

What it is not, usually, is cheaper. Two single head systems covering two rooms often come in below a two head multi split, because multi split outdoor units carry a price premium, the pipe runs are longer and the commissioning is more involved. People assume sharing one outdoor unit must save money, and on the equipment alone it sometimes does, but by the time the extra pipework and labour are in the number the gap closes or reverses.

There is a performance argument too. Single head systems run independently, so a failure takes out one room rather than three, and each unit modulates purely for its own space. Multi splits share a compressor, which means the rooms interact and a fault affects everything connected. Where the choice is genuinely open, we usually recommend separate units and keep the multi split for cases where the site demands it.

Back to back means the indoor head and the outdoor unit are on opposite sides of the same wall. It is the cheapest installation there is: one core hole, a short pipe run, a simple drain, minimal labour. If you have flexibility about which wall the head goes on, choosing a back to back position is the single biggest saving available on this job.

Once the outdoor unit has to move away from that wall, cost climbs steadily. Additional pipe run beyond the standard allowance is an indicative $80 to $130 per metre supplied and installed, and it adds up faster than people expect because the pipe rarely travels in a straight line. A run that goes up into the roof, across the house and back down an internal wall can be fifteen metres on a house that measures ten across.

Height and access are the other pair. A head high on a wall in a double height void, an outdoor unit that has to be mounted on a first floor wall, or a condenser positioned where a ladder will not safely reach all bring in either a scaffold or an elevated work platform. Indicatively that is $300 to $900 depending on what is needed and how long it is on site. Roof mounting brackets or an upper level wall bracket add an indicative $150 to $400.

Drainage is the quiet one. An indoor head produces condensate that has to fall to a suitable discharge point. On a wall where gravity works, this is nothing. On an internal wall, in a room with no external drainage, or on a unit mounted low, it can mean a condensate pump and a longer drain line, which is an indicative $250 to $500 addition.

Small splits can sometimes connect to an existing suitable circuit with an isolator, which is why the standard installation price assumes it. Larger units, and any installation where the existing circuit is already loaded or does not have appropriate protection, need their own dedicated circuit run back to the switchboard.

A new dedicated circuit is an indicative $350 to $800 depending on the distance from the board, whether the cable can run through a roof space or has to go around a slab, and what the wall construction is. It is straightforward work but it is real work, and it is the item most commonly missing from a very cheap online quote.

Behind the circuit sits the board itself. If there are no spare ways, no physical room for another protective device, or no RCD protection on the final subcircuits, a switchboard upgrade comes first at $800 to $3,500 or more. That is not padding, it is the sequence the work has to happen in. Our switchboard cost guide explains the three tiers, and the electrician cost guide covers how hourly and fixed price electrical work is charged in Melbourne generally.

If you are adding a split system to a house that will also be getting solar, a battery or an EV charger over the next few years, say so at quote stage. Sizing the board once for the whole plan is materially cheaper than opening the same enclosure three times.

Same room, same model, two quotes hundreds of dollars apart. These are the reasons, in roughly the order they move the number.

Split system quoting has more hidden variation than almost any other trade job, because the headline is a familiar model number and everything that differs is in the installation detail.

Ask every contractor for five things in writing. The exact model and rated capacity, since a 5kW from two brands can be $600 apart at wholesale. The included pipe run length and the rate for anything beyond it. Whether the electrical connection is to an existing circuit or a new dedicated one, and whether any switchboard work is priced or assumed away. The mounting method for the outdoor unit. And whether removal of the old system is included.

Then check credentials rather than assuming them. Refrigerant work requires an ARC licence. The electrical connection requires a licensed electrician issuing a Certificate of Electrical Safety. A quote that mentions neither is not a bargain. Also ask about the workmanship warranty as distinct from the manufacturer warranty, because on a split system the most common problems in the first two years are installation related rather than equipment related.

Pivot Trade Services holds REC 37223 and SAA accreditation S3962281, installs across Melbourne western suburbs from the Altona workshop, and carries a 12 month workmanship guarantee on top of the manufacturer warranty. If a split is not the right answer for your house, we will say so and price heating and cooling alternatives instead. To get a fixed price in writing, contact us.