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Home Generator Index

The GTA register of standby generator contractors

Home Generator Index ranks Greater Toronto Area standby generator installers, transfer switch specialists and backup power contractors by a published 0-100 score built from reviews, what each company states on its own website and its record. A claimed listing publishes the number it wants you to call; every other listing carries a request form instead. Nothing here is for sale.

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Last updated:ByStandby Power Desk

480
GTA companies listed
8
Service categories
4.8★
Average Google rating
159
Confirm backup power work

What does Home Generator Index cover?

Home Generator Index covers 8 categories across the Greater Toronto Area. A standby install is rarely one trade: the electrical work is done by an ECRA/ESA licensed contractor, the gas connection is TSSA-regulated and often a separate gas fitter, and the panel may need upgrading before either can proceed. The categories below let you find the specific trade the job needs instead of a generalist. Behind the register sits a dataset of 480 companies, each scored out of 100 on its reviews, what it states on its own website and its record, at an average rating of 4.8★ across 430 rated companies. Every category hub ranks the companies working in that trade by that score, never ad spend, then links straight to the company's profile. Pick a category below to see the ranked shortlist and local coverage.

  1. 369listedElectriciansThe electrical trade that takes on backup power work: it pulls the permit, sizes the conductors and books the Electrical Safety Authority inspection. Ontario requires an ECRA/ESA licence for that work; this register does not check whether a listed company holds one.
  2. 97listedElectrical Panel UpgradesService and panel work that a generator install often depends on: capacity upgrades, panel replacement, sub-panels and load calculations.
  3. 74listedHVAC & Fuel Line ContractorsThe gas side of a standby install: natural gas and propane line runs, meter capacity checks and TSSA-regulated fuel connections, usually alongside heating and cooling work.
  4. 56listedStandby Generator InstallationPermanently installed standby generators wired into the home electrical system: sizing, pad and gas line work, transfer switch and Electrical Safety Authority inspection.
  5. 12listedCommercial Backup PowerDiesel and natural gas gensets for buildings that cannot go dark: sizing and load studies, paralleling gear, fuel systems and code-required emergency power.
  6. 9listedHome Battery BackupBattery storage as an alternative or supplement to a fuel generator: whole-home and partial-load battery systems, solar pairing and critical-load panels.
  7. 8listedTransfer Switch InstallationThe switchgear that moves a house from utility power to generator power: automatic transfer switches, manual switches, interlock kits and generator inlet boxes.
  8. 7listedGenerator Repair & MaintenanceScheduled servicing, warranty work and emergency repair for installed standby units: oil and filter changes, load testing, controller faults and battery replacement.

What does backup power cost in Toronto?

Standby generator, 7.5-11 kW, fully installed runs $6,500 to $9,500 per project (CAD) according to RenoHouse (Toronto, 2026 guide), and standby generator, 14-18 kw, fully installed runs $9,500 to $13,000 per project (CAD) (RenoHouse, Toronto, 2026 guide). Add 13% HST.

Home Generator Index researches market pricing for every category from named GTA contractor and manufacturer sources, not guesses, so you can check a quote against something real. Each cost guide separates the unit, the electrical work, the gas line and the Electrical Safety Authority inspection, then links to ranked companies for firm numbers on your own house.

See all Home Generator Index cost guides

Which confirmed backup power companies rank highest?

Ranked by the Index Score

The 8 highest-ranked companies in the Greater Toronto Area that say on their own website that they do generator or backup power work, ordered by the Home Generator Index Score rather than by who paid. 159 of the 480 companies in the register clear that bar. Every row shows the real Google rating and review count, and a direct way to reach that company.

Where does Home Generator Index cover across the GTA?

Home Generator Index maps every one of its 480 listings to a specific Toronto neighbourhood, borough or GTA city, so you compare companies that actually serve your street rather than one somewhere across the region. That matters here: a standby install needs a site visit, a gas meter capacity check and an inspection, so travel distance is part of the job. Coverage now spans 44 mapped areas, from downtown Toronto and the boroughs of North York, Scarborough and Etobicoke out to cities like Mississauga, Vaughan and Markham; 16 of them have enough listings to carry a page of their own. By listed-company count, the deepest coverage is in Richmond Hill (42), Toronto (35), Vaughan (35), Markham (33), Mississauga (32). Open the area closest to your address to see exactly who serves it.

Browse all GTA areas

How does Home Generator Index work?

Home Generator Index turns a scattered search into three steps. You compare companies ranked by a published score, check the going market price, then send a request to the one that fits. The whole register is free to read, and you are never obligated to hire.

  1. 1. Compare ranked companies

    Browse any of 8 categories or your GTA area and see companies ranked by the Home Generator Index Score, not ad spend.

  2. 2. Check real pricing

    Every category has a cost guide sourced from named GTA contractors and manufacturers, so you know the going rate before you call.

  3. 3. Send a request

    A company that has claimed its listing publishes the number it wants you to call. For every other row, the request form reaches Home Generator Index.

How does Home Generator Index rank companies?

Home Generator Index gives every company a score out of 100 and ranks on it. It is built from three things: what customers said, worth 42 points; what the company states on its own website, worth 33; and how much is on its record, worth 25. Star ratings are blended with the dataset average of 4.8★ using a 10-review prior, so a rating only approaches its raw value once real volume backs it up: a 5.0 built on 4 reviews counts as 4.83, not 5.00, while a 4.8 built on 300 counts as 4.80. The middle part comes from fetching each company's own website and storing a quote for every claim we found, which is why a profile says a company says it is licensed rather than that it is: we have checked nothing with the ESA, TSSA or an insurer. Companies with fewer than 3 reviews or a rating below 4.0 sort below every company that clears that bar, so they never lead a ranked list here. No company can buy a higher position, and the method is identical for all 480 listings.

Read the full methodology

What should you ask a generator installer before hiring?

Before you sign with any Greater Toronto Area generator company, these are the questions that separate a solid quote from a risky one. Each one tells you whether the licensing, the fuel supply, the inspection and the scope actually hold up.

Home Generator Index questions, answered

How does Home Generator Index rank generator companies?

Order comes from the Home Generator Index Score out of 100, built from three parts: what customers said, worth 42 points; what the company states on its own website, worth 33; and how much is on its record, worth 25. Inside the first part, review volume is weighed, so a perfect score on a handful of reviews is pulled back toward the register average of 4.8★ instead of counting at face value. Companies under 3 reviews or below 4.0★ sort beneath every company that clears that bar. Nothing here can be bought. The methodology page carries the whole formula.

Is Home Generator Index free to use?

Yes. Browsing all 480 companies and reading the cost guides on Home Generator Index is free, and there is nothing to buy. A request form reaches Home Generator Index by email if you want one company to reach out; your details are not published on the site and are not sold. Listing is free for contractors too, and no business can pay for a better position.

Which areas does Home Generator Index cover?

Home Generator Index covers the Greater Toronto Area, from downtown Toronto and the boroughs of North York, Scarborough and Etobicoke out to 44 mapped neighbourhoods and cities including Mississauga, Vaughan, Markham and Oakville. 16 of those carry a page of their own; the rest hold too few listings to be worth one. We track 480 companies across 8 service categories.

Is a generator contractor in Ontario required to be licensed?

Electrical work on a standby generator is regulated by the Electrical Safety Authority. The contractor doing the wiring must hold an ECRA/ESA licence, and the installation is inspected. The gas connection is a separate, TSSA-regulated trade, so some jobs involve two contractors. Ask for the licence number and check it on esasafe.com before work starts. Home Generator Index publishes public review data and does not verify licences for you.

How current is the review data on Home Generator Index?

Every rating and review count on Home Generator Index comes from public Google Maps data, refreshed for the August 2026 dataset. The average rating across our 480 companies is 4.8 stars. The dataset is a snapshot: ratings change on Google between refreshes, so check the company's current rating before you decide.