At a Glance
Ventilation and exhaust fan installation in Sydney typically costs $200–$1,500 per job. A like-for-like bathroom fan replacement with existing ducting and wiring sits at the low end. New installations requiring ducting through roof spaces, external wall penetrations in brick, or multi-room extraction push toward the top.
What's Included in the Price
- Supply and install of the exhaust fan (ceiling, wall, or inline type)
- Ducting from the fan to an external discharge point (roof cowl or external wall vent)
- Electrical connection or switch wiring, compliant with AS/NZS 3000 Wiring Rules
- Roof or wall penetration with weatherproof sealing
- Extraction capacity sized to meet AS 1668.2 Ventilation Design minimums
- Testing and commissioning
Materials (fan, ducting, cowl, wiring) are typically 20–30% of the total. The majority is labour, with ducting complexity and access difficulty driving the spread.
What Affects the Cost
- Existing ducting condition. If ducting is already in place and runs to the outside, a fan swap is quick and cheap. Many older Sydney homes have flexible foil ducting that has sagged, kinked, or separated at joins. Replacing degraded ducting with rigid or semi-rigid duct adds cost but dramatically improves airflow and longevity.
- Fans venting into the roof cavity. This is extremely common in Sydney homes built before the early 2000s. The fan runs, but the moist air dumps into the roof space instead of outside. Correcting this requires adding a duct run and external discharge point — more expensive than a simple fan swap, but essential to prevent mould and timber damage.
- Construction type. Inner-west terraces and older brick homes require core drilling for external wall penetrations. Timber-frame homes in outer suburbs are quicker to work with.
- Apartment vs house. Apartment installations involve shared ceiling voids, strata restrictions, and potentially longer duct runs to reach an external wall. Some buildings have centralised exhaust risers that individual units connect into.
- Number of fans. A single bathroom fan is straightforward. Adding exhaust to a second bathroom, ensuite, and laundry multiplies the work.
- Electrical requirements. If the existing fan runs off a light circuit and you want a separate switch or timer, new wiring is needed.
- Roof access. Many Sydney homes, particularly older terraces and cottages, have low-pitch roofs with very limited crawl space, making ducting installation slower and more physically demanding.
A simple bathroom fan swap with working ducting and wiring sits toward $200. Installing new exhaust fans in two bathrooms and a laundry with new ducting runs through a tight terrace roof, core-drilled external wall vents, and new switched circuits pushes toward $1,500.
Sydney-Specific Considerations
Sydney's apartment stock presents unique ventilation challenges. Many apartment bathrooms, particularly in buildings from the 1960s through 1990s, have no external window at all. The exhaust fan is the only source of ventilation, and if it fails, is undersized, or ducts into a ceiling void rather than outside, mould develops quickly — especially with Sydney's coastal humidity.
In the inner west, suburbs like Marrickville, Newtown, Balmain, and Leichhardt are dominated by Federation-era terraces and Victorian cottages. These homes frequently have bathroom fans that were retrofitted decades ago and vent straight into the roof cavity. The resulting moisture damage to roof timbers and insulation is a common finding during building inspections. Correcting the ducting to vent externally is one of the highest-value ventilation improvements you can make.
Coastal humidity along the Eastern Suburbs and Northern Beaches means bathroom condensation is a year-round issue, not just a winter one. Homes close to the water benefit particularly from properly sized extraction meeting the AS 1668.2 minimum of 25 L/s.
For kitchen rangehoods, open-plan living in newer apartments and renovated terraces means cooking fumes spread further. If you have a gas cooktop, the National Construction Code requires external ducting — a recirculating rangehood is not compliant. Ducting a rangehood through an external wall or roof in a terrace can be complex and should be scoped carefully.
Strata properties require body corporate approval for any work that affects the building exterior, including installing a new vent cowl or wall grille. Allow extra lead time for approval, and confirm any restrictions on vent placement or appearance.
Hiring a Licensed Air Conditioning Technician in NSW
Ventilation installation in NSW typically involves two skill sets: an electrician for the wiring and an air conditioning technician or ventilation specialist for the ducting and fan selection. Many installers are licensed to do both.
All hardwired electrical work must be performed by an electrician holding a current licence issued by NSW Fair Trading. The electrician must issue a Certificate of Compliance Electrical Work (CCEW) for the electrical portion of the installation.
Ask for the CCEW before final payment. If an installer says they will send it later, treat that as a red flag — the certificate should be issued on the day of completion. You can verify a licence number on the NSW Fair Trading website.
For ducting work specifically, there is no separate ducting licence in NSW, but the installer should be able to demonstrate experience with residential ventilation systems and knowledge of AS 1668.2 extraction rate requirements.
How We Calculate
Estimates are based on surveyed trade rates for licensed electricians and air conditioning technicians in the Sydney metro area, adjusted for property age. All prices include GST. Figures cover standard residential exhaust fan and ventilation work. Commercial extraction systems and ducted air conditioning are not included.