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A ducted vacuum puts the motor and the dust somewhere else. A power unit lives in the garage, a shed or a laundry, rigid pipework runs through the roof space and down inside walls, and all you carry around the house is a hose. The appeal in an Australian home is partly the suction and partly the exhaust: the fine dust that a portable vacuum recirculates into the room ends up in a canister in the garage instead.
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The thing to understand before you get quotes is where the work actually happens. Apart from the wall inlets, almost none of it is in your living areas. Installers spend their day in the roof space, dropping pipe down wall cavities and threading it past top plates, insulation, wiring and ductwork. In a retrofit that is the entire job, and it is why two quotes for the same house can differ so much: one installer has worked out a route and the other has not.
That roof space is also the most hazardous part of the house. SafeWork NSW has issued a safety alert about electrical hazards when working in ceiling spaces, warning that electric shock from contact with damaged or exposed energised wiring or equipment could lead to serious injury or death. It is a straightforward reason to keep this job with people who do it for a living.
New build, retrofit and the routes a pipe can take
- At frame stage the pipework is stapled to studs before the linings go on, inlet positions are set from the plan, and the installation is close to invisible.
- In a single storey house with a pitched roof and a walkable ceiling space, a retrofit is usually straightforward: pipe runs in the roof and drops down internal walls.
- In a two storey house the ground floor inlets are the hard part, because the pipe has to come down inside a wall and then travel under the floor or through a bulkhead.
- A slab-on-ground house with a flat or skillion roof offers almost no ceiling space, which usually means a bulkhead, a cupboard chase, or accepting fewer inlets.
- Brick veneer gives you a cavity to work in; double brick, common in Perth and parts of Adelaide, generally does not, so pipes run in furring channels or chases.
- Retro-fit hose systems that live permanently in the wall reduce the number of inlets you need but need a larger diameter pipe, which changes the routing question entirely.
Why the roof space is the dangerous part of this job
SafeWork NSW's safety alert on ceiling spaces lists the sources of electricity that may be present: wiring for lighting circuits, power points, hot water systems and air conditioners, solar and battery systems, and the consumer mains connecting the overhead service line to the meter box. Its instruction is blunt — switch off all power at the electricity meter box and place a lock on the main switch or on the meter box itself — and it adds the warning most people miss, that switching off at the meter box does not turn off the electricity supply from the street to the meter box, so the incoming lines remain live.
Solar makes it worse rather than better. The alert notes that isolating at the inverter does not cut all power, because the wiring connecting the panels to the inverter will still be live while the panels are generating. On an Australian roof in summer that is most of the day.
Add the ordinary hazards of a domestic roof space — heat, dust, insulation, and a ceiling you will fall through if you step off a joist — and the case for leaving this to an installer who does it daily makes itself.
How a ducted vacuum is installed into a finished house
- A walk-through that settles inlet positions by testing hose reach room to room, not by counting rooms.
- An inspection of the roof space and subfloor to confirm a route exists before any price is committed.
- Selection of a location for the power unit that has power, ventilation, drainage for nothing in particular and enough clearance to remove the canister.
- Cutting the inlet openings, dropping pipe down the cavity and connecting the low-voltage switching wire that tells the unit a hose has been plugged in.
- Running the pipework in the roof with the correct falls and sweeping bends, because tight elbows are what create blockages later.
- A licensed electrician connecting the power unit; in New South Wales that work must be covered by a Certificate of Compliance for Electrical Work, submitted no later than seven days after the electrical test is completed.
The only licensed part is the electrical connection
No Australian state or territory licenses ducted vacuum installation as a trade. There is no register to check, no licence number to verify, and no certificate at the end. That is not a scandal — the work is low risk to the building — but it does mean the usual licensing check tells you nothing, and you fall back on ordinary business substance: an ABN, public liability insurance, references from houses of a similar age and construction.
The electrical connection is different. Connecting the power unit is electrical wiring work, and it is licensed in every state and territory regardless of how small it is. In New South Wales an electrician must give Building Commission NSW a Certificate of Compliance for Electrical Work showing the work has been tested and complies with the Gas and Electricity (Consumer Safety) Regulation 2018. If a vacuum installer offers to wire in the unit themselves, ask which licence they hold.
Blockages, suction loss and noise that arrives later
- Loss of suction at one inlet only points to a blockage in that branch; loss at every inlet points to a full canister, a clogged filter or a leaking pipe joint.
- The classic blockage is a sock, a bottle cap or a child's toy lodged where two bends are close together, which is why good installers keep bends sweeping and few.
- An unglued or cracked joint in the roof space bleeds air into the system and is almost impossible to find without a pressure test, so insist on solvent-welded joints throughout.
- A power unit mounted on a shared wall with a bedroom will be heard; mounting it on a bracket rather than hard against the plasterboard makes a real difference.
- Exhausting the unit outside rather than into the garage is worth doing where it is possible, because the fine dust that escapes the canister has to go somewhere.
- Inlet doors that no longer trigger the unit usually have a dirty or bent low-voltage contact rather than a wiring fault.
Keeping a system that is out of sight in working order
Empty the canister well before it is full. A ducted vacuum loses suction gradually as the canister fills and the filter loads, so the drop is easy to mistake for a fault. Most households settle on emptying it on a calendar rather than by inspection, because the unit is in the garage and out of mind.
Filters need cleaning or replacing on the manufacturer's schedule, and the hose needs looking at once a year: a split near the handle is the most common failure and the easiest to miss. If your system exhausts outside, check the external vent has not been blocked by a nest or by a garden that has grown up around it. None of this needs a technician, but all of it needs to be somebody's job.
Central Vacuum: frequently asked questions
Can a ducted vacuum be retrofitted into an existing Australian house?
Usually, but the house decides how easily. A single storey home with a pitched, accessible roof space and internal timber-framed walls is the simple case: pipe runs in the roof and drops down walls. A two storey house, a flat or skillion roof with almost no ceiling space, or double brick construction all make the routing harder and can mean bulkheads, chases or fewer inlets. Any installer quoting without having looked in the roof space and under the floor is guessing.
How many inlets does a house need?
Fewer than most people assume, because the number is set by hose reach rather than by room count. The right method is to walk the house with a tape and check that the hose you intend to buy will reach every corner, including hallways, stairs and the far side of large rooms, from the proposed inlet positions. Inlets placed by counting rooms tend to produce one you never use and one gap you resent for years.
Does the installer need a licence?
Not for the pipework. No Australian state or territory licenses ducted vacuum installation, so there is no register to check. The electrical connection of the power unit is a different matter: electrical wiring work is licensed everywhere in Australia regardless of its size or cost, and in New South Wales the electrician must provide Building Commission NSW with a Certificate of Compliance for Electrical Work. Ask who is doing that part and what licence they hold.
Why is my ducted vacuum suddenly losing suction?
If it has dropped at every inlet, start with the canister and the filter, which load gradually and are the most common cause. If it has dropped at one inlet only, there is a blockage in that branch, and the usual culprits are small objects that lodged where two bends sit close together. A slow loss across the whole system that does not improve after cleaning the filter can indicate an air leak at a pipe joint in the roof space, which needs the installer rather than the householder.
Is it safe to run the pipework myself to save money?
It is not a job to take lightly. SafeWork NSW's safety alert on ceiling spaces warns that electric shock from contact with damaged or exposed energised wiring could lead to serious injury or death, tells you to switch off all power at the meter box and lock the main switch, and points out that doing so does not de-energise the supply from the street to the meter box. It also notes that isolating a solar system at the inverter leaves the panel wiring live. Combine that with heat, insulation dust and a ceiling you can fall through, and it is work for people equipped for it.
Sources
Written by the LokalMatch editorial team. Last reviewed 22 September 2026. How we write and check our guides
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What affects the cost of central vacuum
Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:
- Size and scope of the job
- Materials and finishes chosen
- Condition of what's there now
- Access to the work area
- Urgency and scheduling
- Permits, where required
How to compare central vacuum installers before you hire
- Describe the job clearly, with photos if you can, so pros can give you a realistic quote.
- Get more than one written quote and compare them on the same scope of work.
- Check that the pro carries liability insurance and, where required, is licensed for this work in your area.
- Look at recent reviews and photos of similar jobs.
- Get the price, the timeline and the payment terms in writing before work starts.
Questions to ask central vacuum installers before you hire
- Have you done jobs like this before, and can I see examples?
- What is included in your price, and what isn't?
- Does this work need a permit from my municipality, and who will get it?
- Can you show me proof of liability insurance?
- When can you start, and how long will the job take?
- What warranty or guarantee do you offer on your work?
Central vacuum permits and local rules
Some central vacuum work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.
Permits and licensingGuides about central vacuum
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