Exhaust Fan Installation
Bathroom, kitchen, and range hood exhaust fan installation and wiring, vented properly to code.
Overview
Bathroom and kitchen exhaust fans do more than clear steam and cooking smells, they’re the main defence against the moisture and grease buildup that leads to mould, peeling paint, and damaged drywall. We install and wire new bathroom, kitchen, and range hood exhaust fans, and replace noisy, underpowered, or improperly vented existing fans, for homes and businesses across Toronto and the GTA. That includes running a dedicated circuit or switch leg where none exists, sizing the fan to the room, and making sure the duct actually vents to the exterior rather than dead-ending in the attic, which is one of the most common issues we find on service calls.
- Bathroom, kitchen & range hood exhaust fans
- Proper duct routing to an exterior vent, not just the attic
- Humidity-sensing & timer-controlled fan wiring
We provide exhaust fan installation across Toronto and the GTA. Have a question first? Contact us or read more about our team.
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Why It Matters
A lot of exhaust fan problems aren’t really fan problems, they’re wiring and venting problems. Builder-grade bathroom fans are often wired on a shared switch leg with the room’s lighting, which is fine until you want a humidity-sensing or timer-controlled fan that needs to run independently of the light. Just as common, and more serious, is ductwork that was never properly connected to an exterior vent: instead of expelling moist air outside, it’s pushed into the attic space, where it condenses and leads to mould and wood rot that isn’t visible until it’s already a real problem. The Ontario Building Code requires mechanical ventilation in bathrooms without an operable window for exactly this reason, and older homes that predate that requirement, or that had a fan added without a permit, are the ones we see it in most often.
How Exhaust Fan Installation Works
- 1
Assessment & venting check
We check your existing fan’s wiring and switch setup and, critically, where the duct actually terminates, since a disconnected or attic-vented duct is a common hidden issue.
- 2
Fan & circuit planning
We size the fan in CFM to the room and help you choose between a standard, humidity-sensing, or fan/light/heater combo unit, then confirm whether a dedicated circuit or switch leg is needed.
- 3
Installation & duct routing
We install the fan housing, run or correct the ductwork to a proper exterior vent cap, and wire it to its own switch or sensor control.
- 4
Testing
We test airflow and confirm the duct is fully sealed and venting outside before we consider the job done, not just that the fan spins.
What Affects the Cost
Cost depends mainly on ducting: whether an existing vent run can be reused or a new route needs to be cut through the ceiling, roof, or an exterior wall, how far the fan is from the nearest exterior wall or roofline, and whether the job includes a dedicated circuit or just a switch leg. Humidity-sensing and combo fan/heater units also cost more than a standard fan.
Frequently Asked Questions
- Why does my bathroom still feel humid after running the exhaust fan?
- This usually means the fan is underpowered for the room or, more often, that the duct isn’t actually venting outside. We check where your ductwork terminates as part of every assessment, since a disconnected or attic-vented duct is a surprisingly common issue.
- Do I need a dedicated circuit for a new exhaust fan?
- Not always. Many bathroom fans can run on a shared switch leg with the lighting, but a humidity-sensing or timer-controlled fan usually needs to operate independently, which we can wire as part of the installation.
- Can you install an exhaust fan where there isn’t one currently?
- Yes, including running new ductwork to a proper exterior vent cap and wiring a new switch or sensor control, for bathrooms or kitchens that were never fitted with one.
- Is my home required to have a bathroom exhaust fan?
- The Ontario Building Code requires mechanical ventilation in any bathroom without an operable window. Older homes sometimes predate this requirement or had a fan added without a permit, which we can assess and correct.
- How much does exhaust fan installation cost?
- Cost depends mainly on the ducting: whether an existing vent run can be reused, how far the fan is from an exterior wall or roofline, and whether a dedicated circuit is needed. We provide a clear quote after seeing the space.
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(416) 828-6976