Generator installation in Markham: what to expect
Outages in Markham come with ice storms and summer thunderstorms. Even a few hours without power matters if your basement relies on a sump pump or someone at home relies on medical equipment.
We size the generator from a load assessment — essential circuits only, or the whole home — install the automatic transfer switch, and coordinate the gas connection with a licensed gas fitter.
Prefer a portable generator? A properly installed inlet and interlock lets you power the panel safely, without dangerous back-feeding into Alectra Utilities's lines.
Local notes: Markham
Basement suites. Second units are popular across Markham. A legal suite needs the electrical side designed with the fire separation and alarm rules in mind.
Offices and tech campuses. Tenant fit-outs, lighting controls and maintenance for office and tech buildings along Highway 7 and the 404.
Typical costs
| Scope | Typical range |
|---|---|
| Generator inlet + interlock for a portable unit | $900 – $1,800 |
| Essential-circuits standby (approx. 10–14 kW) | $13,000 – $18,000 |
| Whole-home standby (approx. 18–26 kW) | $17,000 – $26,000 |
Where we work in Markham
We cover all of Markham, including Unionville, Markham Village, Cornell, Cathedraltown, Berczy Village, Milliken, Thornhill, Box Grove. Every job starts the same way: a site visit, a written fixed quote, then the work — permit included.
More on this service: Standby generators · Electrician in Markham
Questions from Markham
What size generator does a Markham home need?
Essential circuits typically need 10–14 kW; whole-home backup with central air usually 18–26 kW. We size from a load assessment.
Who connects the gas?
A licensed gas fitter — we coordinate them as part of the job.
Is a portable generator inlet worth it?
For many homes, yes: it's far cheaper than a standby unit and powers the panel safely.
Generator installation nearby
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