Panel upgrades in Thornhill: what to expect
Most homes we open up in Thornhill are 1960s–80s homes and 2000s subdivisions. Homes of this age commonly have 100 or 125 A services, or a 200 A panel that's simply out of breaker spaces.
Service upgrades in Thornhill need a disconnect and reconnect from Alectra Utilities. We file the ESA notification, book the utility, and on the day swap the panel, re-terminate every circuit and test before Alectra Utilities restores power — usually the same afternoon.
Adding a basement apartment is one of the most common reasons Thornhill homeowners call us about their panel: a second household means a second set of loads, and often a dedicated sub-panel.
Local notes: Thornhill
Heritage core. Older homes around Thornhill Village need careful work: minimal openings in original plaster and respect for heritage features.
1970s–80s homes. Large homes in Royal Orchard and Bayview Glen are often on 100 or 125 A services that struggle with today's appliances, central air and EVs.
Typical costs
| Scope | Typical range |
|---|---|
| 100 A → 200 A, panel and meter base in same location | $3,500 – $5,500 |
| Includes new mast / service entrance or panel relocation | $5,500 – $8,000 |
| Fuse panel replacement (keeping 100 A) | $2,000 – $3,200 |
| Sub-panel for a basement, garage or addition | $1,200 – $2,500 |
Where we work in Thornhill
We cover all of Thornhill, including Thornhill Village, Thornhill Woods, Royal Orchard, Bayview Glen, Uplands, Spring Farm, Doncaster, Crestwood. Every job starts the same way: a site visit, a written fixed quote, then the work — permit included.
More on this service: Panel & service upgrades · Electrician in Thornhill
Questions from Thornhill
How long does a panel upgrade take in Thornhill?
Usually one day on site with four to eight hours without power. Booking the Alectra Utilities disconnect typically takes one to three weeks.
Who handles the Alectra Utilities side?
We do. We book the disconnect and reconnect with Alectra Utilities and file the ESA permit — you don't need to call either.
Do all Thornhill homes need 200 A?
No. If you're only adding an EV charger, load management can often avoid an upgrade. We'll calculate your actual load first.
Panel upgrades nearby
Vaughan · Markham · Richmond Hill · Aurora · Newmarket · Toronto · Etobicoke · North York