How Much Does Exhaust Fan Installation Cost in Perth? (2026 Prices)

Plenty of Perth bathrooms built before 2019 have an exhaust fan that pushes steam straight into the roof space — which is why the ceiling goes black in the corners and the insulation above the shower is damp. Newer building rules require exhaust air to go outside, and it's the difference between a fan that works and one that just makes noise. This guide covers what each exhaust fan job costs in 2026, what's done, how to size and choose a fan, and the rules.

1. Check the room and the roof. Position over the shower or bath (not the door), a route for the duct to the nearest eave or a roof vent, and whether the existing fan is ducted at all.
2. Isolate the circuit and confirm RCD protection — bathroom circuits need it.
3. Cut the hole (a 200–250 mm opening for a standard fan, or the 3-in-1 unit's rectangle) between the joists; the old fan and its hole reused where the position works.
4. Wire it. From the light switch so the fan runs with the light, or on its own switch; a timer or humidity sensor where you want it; a dedicated circuit for 3-in-1 heat lamps where the unit needs it.
5. Duct it outside. 150 mm insulated flexible duct to an eave vent or roof cowl, with a backdraft flap so the winter air stays out.
6. Test and certify. Airflow at the grille, the timer, polarity, earth, RCD trip; your Electrical Safety Certificate follows.

A replacement takes about an hour; a new ducted fan two to three hours; a 3-in-1 with a new circuit half a day.

• Airflow. Aim for at least 15 air changes an hour: a 2.5 m × 2 m bathroom with a 2.4 m ceiling is 12 m³, so 180 m³/h or more. Most 250 mm ceiling fans move 200–400 m³/h; ensuites with long duct runs suit an inline fan.
• Ducted, always. Steam into the roof space rots timber, wets insulation and grows mould. Duct to the eaves or a roof vent.
• Noise. Look for the sone or dB rating; inline fans in the roof are the quiet option.
• Timers and sensors. A run-on timer keeps the fan going after the light goes off; a humidity sensor runs it only when needed. Both stop the "nobody ever turns the fan on" problem.
• 3-in-1 units. Heat lamps, fan and light in one — fine in a bathroom that gets cold in July, but check the fan's airflow, which is often weak, and whether the heat lamps need their own circuit.
• IP rating. A fan directly over the shower needs a rating for the zone; most ceiling fans outside the shower recess are fine.
• Brands. Ventair, Martec, IXL (Tastic), Fanco and Brilliant are the common ones — we fit whichever you choose.

• Licensed contractor only. Wiring an exhaust fan, timer or 3-in-1 is electrical work for a licensed electrical contractor (our licence is EC15449).
• Exhaust to outside. The National Construction Code requires bathroom, laundry and kitchen exhaust to discharge outdoors — not into the roof space — for new work. Older homes aren't forced to retrofit, but building inspectors notice the mould.
• RCD protection on the circuit under AS/NZS 3000:2018, and zone rules for anything mounted inside or above the shower recess.
• Heat lamps. 3-in-1 units with 2–4 heat lamps draw up to 1,100 W and often need their own circuit under the manufacturer's instructions.
• Electrical Safety Certificate for the work, within 28 days.

• Replacement vs new position. Reusing the hole and wiring is the cheap job.
• Ducting. A short run to the nearest eave is quick; a long run to a roof cowl on a two-storey home isn't.
• Roof access. Ground floor of a two-storey home means working from below.
• 3-in-1 units — a bigger hole, a three-gang switch and often a new circuit.
• Timers and sensors add a little and are worth it.
• Number of rooms. Bathroom, ensuite and laundry in one visit are much cheaper per fan.

Send a photo of the bathroom ceiling and the switch, tell us whether the fan currently ducts outside, and whether you want a timer or a 3-in-1 — that's usually enough for a fixed price.

• Fixed price before we start, $0 call-out fee.
• Most fans done in a single visit.
• Ducted outside, timer set, tested, with the Electrical Safety Certificate.
• Licensed electrical contractor EC15449, 300+ five-star Google reviews. See our bathroom fan installation and heat, fan and light pages.

We install exhaust fans across the Perth metro — Joondalup, Scarborough, Morley, Melville, Canning Vale, Baldivis and everywhere between.

• Do all the wet rooms at once — bathroom, ensuite, laundry, toilet.
• Reuse the position if it's over the shower and the wiring is sound.
• Duct it now rather than paying for a mould treatment and a new ceiling later.
• Choose a timer over a sensor if budget matters; both solve the real problem, which is the fan never being on.
• Bundle with the bathroom renovation — the hole and the duct are easy before the new ceiling goes in.

Ready for an exhaust fan in Perth?

Call 0422 117 839 or request a free quote online. Fixed price, $0 call-out fee, ducted outside with the certificate included. More on our bathroom fan installation page.