Sizing a Standby Generator for a GTA Home

The most detailed Toronto-specific data collected for this site comes from RenoHouse's tiered breakdown, whose three bands above represent its residential range. Past 26 kW, the same guide stops quoting single-fuel units and switches to a generator plus battery hybrid tier, priced at $25,000 to $55,000 fully installed; that option is a different product, not a larger version of the same one.

The gap becomes important once a quote exceeds the top band. None of the Toronto-specific sources gathered here lists a standalone price for a pure single-fuel unit larger than 26 kW, so a quote at that size comes from extrapolating the 20-26 kW band rather than checking against a published Toronto figure. A homeowner reviewing a 30 kW proposal has no local published number to compare it with.

In Ontario, the 13% HST is charged on the entire installed price, and quotes in this market usually appear before tax. As a result, two bids in the same band can vary by more than the width of the band itself when one bid includes HST and the other does not.

RenoHouse uses a 16 kW Toronto example for its itemised figures, and most of the components stay the same no matter what size unit sits on the pad. A TSSA-licensed sub-contractor installs the gas line from the meter over a 30 to 50 foot run for $1,200 to $2,200; runs beyond 60 feet add another $500 to $1,000. An ESA Master Electrician completes the electrical tie-in, covering panel and transfer switch wiring, for $1,800 to $2,400. A poured concrete pad measuring 4 feet by 5 feet on a 6-inch slab costs $400 to $700. Permits, inspections and commissioning together cost $400 to $700.

Making the generator smaller does not significantly reduce the cost of any of those four line items. The trench length stays the same, the panel location stays the same, the ESA permit remains required for any permanent installation no matter its size, and the pad shrinks only by inches, not feet. After moving down two size bands, a homeowner saves on the cabinet and the transfer switch and pays nearly the same for everything else.

The only component that tracks the decision is the transfer switch. RenoHouse charges $1,400 to $1,800 installed for a 200A service-rated automatic transfer switch with load management. Kolji Bros. Electrical divides the switch types: an interlock kit at $400 to $800, a manual transfer switch at $800 to $1,500, and an automatic transfer switch at $1,500 to $3,000, all supplied and installed. Details on all three are on the transfer switch cost page, and the companies that claim that work are listed under transfer switch installation, a category with 8 of the 480 companies in this index.

In an essential-loads arrangement, a smaller generator supplies a subset of circuits through a sub-panel instead of powering the whole service. RenoHouse prices adding a 60A to 100A sub-panel, the setup typically used to deliver generator power to essential circuits, at $800 to $2,000.

The saving comes from one area. For equipment alone, Remarkable Electric's 10 kW unit costs $3,500 to $5,000, far less than the $7,000 to $10,000 cost of its 22-26 kW band, and TrueSource Generators' 10-14 kW band costs $3,600 to $5,200, less than the $7,000 to $8,500 cost of its 24-26 kW band. Dropping to the smaller tier cuts the cabinet price roughly in half. Add back the sub-panel at RenoHouse's $800 to $2,000, and part of that saving goes away.

For homes without natural gas at the property line, fuel supply makes up the other half of the sizing question. RenoHouse lists an owned and installed 500-gallon propane tank at $2,500 to $3,500, or $200 to $400 a year to rent, and EcoFrost Heating puts the added cost of a propane setup over a natural gas hookup at $100 to $250. The collected guidance also notes that continuous full-load operation can empty a 500-gallon tank in as little as four to seven days, so with propane the unit size determines how long the tank lasts as directly as it determines the purchase price.

Beyond price, the essential-loads route changes how an outage unfolds. A whole-house system covers all of the load the house draws. A sub-panel system covers only the circuits wired into it at installation, and adding a circuit later is electrical work, not a setting change. The index does not record which configuration any listed company installs most often, and no source collected here publishes a Toronto price for a complete essential-loads system as one bundled number.