Panel Upgrade in Markham: Load Checks, Alectra and ESA
KV Bear Electrical is a licensed electrical contractor (ECRA/ESA 7014730) based in Oshawa, serving homeowners in Markham. This page covers how our panel upgrade service works for Markham homes.
Get a Panel Upgrade Quote in Markham
Most requests for a panel upgrade in Markham start with a practical annoyance: a main breaker that trips when the dryer and air conditioner run together, a panel with no empty slots, or plans for a basement kitchen. Behind each sits one question: can the supply Alectra Utilities delivers carry everything the household now plugs in?
This page follows an electrical panel upgrade in Markham from the first load check to the moment Alectra restores power, and it covers the City rules around the job: when a building permit applies, what changes on a heritage street, and how a second unit affects the service.
What Markham Homeowners Should Know
Alectra Utilities, the distributor for Markham, takes residential service upgrade requests online through its New Connections Portal and expects the account to be in good standing. Once the new equipment is in, ESA inspects it and sends Alectra a connection authorization, and only then do Alectra crews return to re-energize the house. Appointments are booked through Alectra's New Connections line at 1-833-494-3674.
Source: Make a Service Request, Alectra Utilities (alectrautilities.com)Alectra's Conditions of Service, last revised May 22, 2024, ask anyone requesting a new or upgraded connection to complete a Service Request Form with the service and load details. Alectra owns its metering equipment and inspects and approves the metering provision before a service is energized.
Source: Conditions of Service, Alectra Utilities Corporation (alectrautilities.com)When a house is getting extra meters, for example for an apartment, Alectra's process begins with an upgrade request on the existing service, followed by a separate request for each new unit that quotes the upgrade's reference number.
Source: Make a Service Request, Alectra Utilities (alectrautilities.com)In the 2021 Census Profile for Markham, 20,570 occupied private dwellings date from 1981 to 1990, a larger group than the 17,710 counted for the two decades from 1961 to 1980, and 9,500 were completed between 2016 and 2021.
Source: Census Profile, 2021 Census of Population: Markham, City, Statistics Canada (www12.statcan.gc.ca)Markham's building permit page puts electrical projects on its list of housing work that does not call for a City building permit, and it points owners who are unsure to an Applications Administrator at 905-475-4858.
Source: Building Permit Process, City of Markham (markham.ca)The City's Secondary Suites Guide for Homeowners requires a building permit before a suite is created and asks that the electrical supply to and within the house be large enough to serve the added unit.
Source: Secondary Suites Guide for Homeowners, City of Markham (markham.ca)ESA's 2026 Wiring Fee Guide, effective July 6, 2026, lists a service change or panel change at $86 when a contractor files, subject to the $92 minimum notification fee, and at $212 for a non-contractor filing (as of October 2026).
Source: 2026 Wiring Fee Guide, Electrical Safety Authority (esasafe.com)Inside Markham's heritage conservation districts, owners and tenants need a heritage permit for non-structural changes to the outside of a building, and the City names exterior lighting, painting and replacement windows or doors among its examples.
Source: Heritage Conservation, City of Markham (markham.ca)
Facts checked October 15, 2026.
Markham Housing Eras and Their Electrical Supply
The 2021 Census shows Markham growing in waves, with 20,570 occupied dwellings from the 1980s alone, more than the 17,710 still standing from the 1960s and 1970s together, plus another 9,500 finished between 2016 and 2021. A house from that 1980s wave is now around forty years old, and its panel was laid out for the appliances of its day, before central air, finished basements or heat pumps were added.
Age alone does not settle it, since a gas-heated 1985 house may sit comfortably on its present supply while a far newer one with electric heat in an addition runs short. The deciding tool is a load calculation under the Ontario Electrical Safety Code: it totals heating, cooling, cooking, laundry, water heating and anything planned, then measures that figure against the main breaker and the service conductors.
If the numbers fit, the answer may be an electrical panel replacement in Markham on the same supply, giving more circuit spaces and modern breakers without a bigger service. If they do not fit, the service itself has to grow, usually to 200 amps, and Alectra joins the schedule.
How Alectra Handles a Markham Service Upgrade, Step by Step
The utility side runs through Alectra's New Connections Portal. Your contractor files the request online with the service and load information that Alectra's Conditions of Service call for, and the account at the address has to be in good standing before it moves forward. Any make-ready work is completed and reported back to the New Connections team, and any Alectra charge is paid by EFT or cheque.
On changeover day the supply is cut, the old equipment comes out and the new panel and service entrance go in. ESA then inspects the installation, and a pass sends a connection authorization to Alectra so its crews can come back and re-energize. Because Alectra owns the meter and approves the metering provision before energizing, the position of the meter base deserves as much thought as the panel. Bookings go through the New Connections line at 1-833-494-3674.
The ESA notification is a separate filing with its own fee, listed among the facts above. ESA issues the Certificate of Acceptance to whoever filed, so ask your Licensed Electrical Contractor for a copy, and keep it with any correspondence from Alectra about the request.
Panel Upgrade in Unionville, Second Suites and City Permits
A panel upgrade in Unionville, Markham Village or Buttonville raises a question that newer subdivisions skip. All three are on the City's list of heritage conservation districts, and Markham wants a heritage permit before non-structural exterior changes there, with exterior lighting among its named examples. A meter base moved to a new spot outside, or a fresh mast on a street-facing wall, is worth raising with heritage staff before the Alectra request goes in.
Indoors, ordinary electrical work needs no City building permit; it is filed with ESA. The exception is a project the City permits for other reasons. The Secondary Suites Guide requires a building permit before a suite is added and expects the service to be sized for the second unit, so a basement apartment can turn a simple panel swap into a full upgrade.
KV Bear Electrical's published range for a typical 100 to 200 amp panel upgrade is $2,500 to $5,000 (as of October 2026). A simple swap beside the existing meter sits low; a new meter base and entrance cable, a relocated panel or tired circuits push it upward. Alectra may bill separately, though an upgrade can carry no Alectra charge when its existing infrastructure already supports the new size.
Panel Upgrade in Markham: Common Questions
Would a newer house need a panel upgrade in Cornell, Markham?
Sometimes. What changes the picture is everything added after the builder left: a basement unit, a Level 2 charger, a hot tub or electric heat in an addition. If a load calculation shows the total still fits, new circuits go into the existing panel or a subpanel; if not, an Alectra upgrade request comes next.
Do I need a City of Markham building permit just to change my panel?
Not for the electrical work by itself. The City lists electrical projects among housing work that needs no building permit, and the panel change is filed with ESA instead. When the upgrade belongs to a larger project the City does permit, such as a secondary suite, that building permit still applies. For a ruling on a particular project, Markham's Applications Administrator is at 905-475-4858.
How long is a Markham house without power during a service changeover?
From the moment the supply is disconnected until ESA's inspection passes and Alectra re-energizes the service. The contractor lines up both around the disconnect date to keep that gap short. Plan ahead for a sump pump or any medical device that needs power.
Can a basement tenant in a Markham house have a separate Alectra meter?
It is possible. The owner first files an upgrade request on the existing service, mentioning the planned meters, and then a separate application goes in for each new unit, quoting the upgrade's reference number. The City's suite rules apply alongside that, including the building permit and the requirement that the service be sized for both units. To book a load check, call 905-999-5048.
What Our Customers Are Saying
“I have utilized the services of KV Bear on a number of occasions and the level of service, professionalism, and knowledge has been excellent. For my home, Kyle has installed a new circuit breaker panel, a dedicated circuit and interface for a portable generator, and a level 2 EV charging station. For each installation, the installation practices have been top notch and permits/inspections have been dealt with professionally. I would not hesitate to recommend KV Bear to anyone looking for a competent electrical contractor.”
“Kyle replaced my 100A panel with at 200A and did a great job. I would definitely use KV Bear again.”
“Top tier service all around. Kyle upgraded my fuse box to a 200amp breaker panel. He is trustworthy, professional, personable, friendly and honest/upfront about timelines and cost. His work is great and he even cleaned up everything, leaving everything as it was. I would recommend him to anyone who wants good work done, and will definitely be using him in the future.”
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