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Transfer Switch Cost: What Each Type Runs Installed in Ontario

Last updated:ByStandby Power Desk

A whole-home automatic transfer switch costs $1,500 to $3,000 supplied and installed in Ontario, a manual switch $800 to $1,500 and an interlock kit $400 to $800, before HST and before the $50 to $350 electrical permit. Which one you need depends on one question: does the changeover have to happen with nobody home?

Price a transfer switch

Supplied and installed, before HST

$1,550–$3,350

Automatic transfer switch (whole-home), which transfers on its own with nobody home. This is what a standby generator is wired to.

Automatic transfer switch, supplied and installed (Kolji Bros. Electrical, Ontario, 2026)
$1,500–$3,000
Electrical permit (Draper Electric, Ontario)
$50–$350
Total before HST
$1,550–$3,350

Kolji Bros. Electrical's figures are supplied AND installed, so equipment and labour are already inside them; Draper Electric's separate $200 to $500 labour row is what a bundle like that is paying for, and is not added again here. An inlet box and cord were requested and dropped, because nothing plugs into this device.

Why this part is not optional

The Electrical Safety Authority's own generator-safety page says a standby generator permanently connected to your wiring must have a transfer device, and that a transfer device is what prevents generator power flowing back into the utility system. That backflow is what can electrocute a lineworker who believes the circuit is dead. Every device priced here is one of the approved ways of preventing it.

Which transfer device does your setup actually need?

Start from the generator, not from the price. A permanently installed standby generator has to have an automatic transfer switch, because the entire point of the machine is that it starts and changes over while you are at work or asleep. A portable generator can use any of the other three, and the choice between them is about how much of the house you want back and how much panel work you are willing to pay for.

An interlock kit is the cheapest at $400 to $800 installed. It is a mechanical plate on your existing panel that makes it physically impossible to have the main breaker and the generator breaker on at once, which is how it does a transfer device's job. A manual transfer switch at $800 to $1,500 is a small sub-panel of circuits chosen in advance, which is tidier and more foolproof but limits you to those circuits. A GenerLink sits behind the meter and needs no panel work at all, which is why it appeals to people whose panel is full or awkward to reach.

Our automatic versus manual transfer switch comparison works through the trade-off in full, and the transfer switch cost guide has every published row including the ones this calculator does not use.

Reading a bundled quote without double-counting

Kolji Bros. Electrical publishes supplied-and-installed prices, so the equipment and the labour are already inside them. Draper Electric publishes the same job unbundled: $200 to $2,000 for the switch itself, $200 to $500 for two to four hours of installation labour, $20 to $100 for an inlet box, $50 to $350 for the permit. Set those side by side and you can see exactly what a bundled number is paying for, which is the useful thing to do with two sources that describe the same work differently.

What you must not do is add them together, and this calculator will not. It uses the bundled figure and adds only what the bundle genuinely excludes. The same trap sits in the generator cost calculator, where a fully installed generator price already contains its own transfer switch: if you are pricing a complete standby install, use that tool rather than adding this one to it.

Frequently asked questions

How much does a transfer switch cost in Ontario?

Kolji Bros. Electrical's 2026 Ontario guide prices an interlock kit at $400 to $800, a manual transfer switch at $800 to $1,500 and a whole-home automatic transfer switch at $1,500 to $3,000, all supplied and installed. The electrical permit is separate at $50 to $350 per Draper Electric. All of those exclude the 13 percent HST, which applies to both the equipment and the labour in Ontario.

Can I just plug my generator into a wall outlet?

Not into your house wiring. The Electrical Safety Authority's generator-safety page states that a standby generator permanently connected to your electrical wiring must have a transfer device, and that a transfer device is what prevents generator power flowing back into the utility system. That backflow is the danger: it can electrocute a lineworker who believes the circuit is dead. ESA notes a portable generator may be used without a transfer device only where there is no possibility of backfeeding the utility lines, which in practice means running appliances directly off the generator's own outlets on cords rather than energising your panel. Once you want the house circuits live, you need one of the transfer devices priced here, and an interlock kit at $400 to $800 installed is the cheapest of them.

What is the difference between a manual and an automatic transfer switch?

Whether somebody has to be home. An automatic switch senses the utility failing, starts the generator and moves the house over on its own, typically in under a minute, and it is what a permanently installed standby generator is wired to. A manual switch is a small sub-panel of chosen circuits that you throw by hand after wheeling out a portable generator and starting it. The automatic one costs roughly twice as much, $1,500 to $3,000 against $800 to $1,500 per Kolji Bros. Electrical, and the difference buys you an outage you can sleep through.

What is a GenerLink and is it cheaper?

A GenerLink is a collar that fits behind your electricity meter, so a portable generator plugs into the meter rather than into your panel and no panel rewiring is needed. Draper Electric publishes the only Ontario prices we can currently re-read: a 30 amp system starting at $1,650 and a 40 amp at $2,449.99, both for the equipment with no installation attached. Starts at is Draper's own wording, so treat $1,650 as a floor and get the installed figure quoted separately. Confirm acceptance with your own utility first, since utility-program pricing differs from retail electrician pricing.

Why is the transfer switch quoted separately from the generator?

Often it is not, and that is worth checking. A standby generator quoted as fully installed already contains its transfer switch: RenoHouse's Toronto breakdown puts a 200 A service-rated automatic switch with load management at $1,400 to $1,800 inside a bundled install price. This page prices the switch on its own, which is what you want if you are connecting a portable generator, replacing a failed switch, or trying to work out what a bundled quote is actually charging you for each part.

Do I need an electrician, or can I fit an interlock myself?

You need a licensed electrical contractor, and in Ontario they are also the ones who must pull the ESA permit for the work. An interlock kit is mechanically simple, which is exactly what makes it tempting, but it is a modification to your main panel and it is the device standing between your generator and the utility line. Draper Electric puts the permit at $50 to $350 and Amps Logics Electric puts standard GTA electrician rates at $95 to $140 an hour.

Where these prices come from

Five named Ontario sources, in Canadian dollars, current as of August 2026. Where they disagree Home Generator Index widens the band rather than averaging: the GenerLink line on this page spans two sources that are $650 apart, and neither of them is discarded. One equipment price is checked against a Canadian retailer directly, which is how Draper's broad $20 to $100 inlet-box estimate was confirmed at its top end.

Who does transfer switch work in the GTA?

Home Generator Index tracks 8 transfer switch installers across the Greater Toronto Area, rated 4.63★ on average. The three below rank highest on our published review-weighted score. Whoever you use has to be a licensed electrical contractor, because they are the ones who can pull the ESA permit.

See all 8 transfer switch installers