Electrical work for duplexes, triplexes, and small apartment buildings.
Full electrical scope for multifamily residential — service entrances, suite metering, unit panels, common-area systems, and the ESA paperwork that goes with it. Built to be inspected cleanly and lived in reliably.
- Service entrance & mast200A, 400A, or 600A 3-phase where required
- Meter stacks & suite meteringIndividual meters per unit for tenant billing
- Unit panels & branch wiringFull rough-in, devices, and trim per suite
- Common areasHallways, laundry, mechanical rooms, exterior
- Life-safety systemsInterconnected smoke/CO, emergency lighting
- ESA permits & inspectionsRough-in and final under our ECRA/ESA licence
Building types we work on
Small-scale residential multifamily is our focus — the sweet spot where quality workmanship and tight coordination matter most.
Duplexes & triplexes
New builds and conversions. Two or three units with separate metering, individual panels per suite, and a shared service entrance sized for the whole building.
Fourplexes
Purpose-built fourplexes with a central meter stack, individual unit panels, shared hallway and mechanical lighting, and proper interconnected smoke/CO per OBC.
Small apartment buildings
Six to twelve unit buildings. Larger service entrances, emergency lighting, hardwired smoke/CO, and coordination with the mechanical and sprinkler trades.
Basement suite conversions
Adding a second legal unit to a single-family home. Separate panel, proper egress lighting, interconnected smoke/CO between units, and an ESA permit.
Garden suites & ARUs
Detached secondary units on residential lots. Underground feed from the main house, sub-panel sized for heating and appliances, full ESA inspection.
Student & rental rentals
Upgrades to existing rental stock — panel replacements, rewires of knob-and-tube, added smoke/CO interconnection, and landlord-grade tamper-resistant devices.
Multifamily electrical FAQ
Electrical only. We work under the GC or owner-builder on multifamily projects and coordinate closely with framing, mechanical, insulation, and drywall. If you need a referral to GCs we've worked cleanly with in Eastern Ontario, we're happy to share names.
Yes. Most multifamily projects we wire are suite-metered with individual meters per unit so each tenant is billed directly by the utility. House-metered buildings (one meter for the whole property, landlord pays) are also an option — we can price both and talk through the trade-offs.
Most fourplexes we wire land on a 200A service, with the actual sizing driven by a proper load calculation. Buildings with heavier load — electric heat, in-suite laundry, or EV charging at every stall — push up to 400A. We run the calc and confirm with the utility before finalizing anything.
Yes — rough-in and final ESA inspections are handled under our ECRA/ESA licence. You'll get the permit number and inspection reports filed against your project so the paperwork trail is clean for occupancy and for insurers later.
Yes. Adding a secondary suite usually means a panel upgrade on the main house, a separate sub-panel for the new unit, interconnected hardwired smoke/CO between the units, and proper egress lighting. We'll walk the home and give you a clear itemized quote before anything starts.
What our customers are saying
Real reviews from real customers on Google.
“I had an excellent experience with Cornerstone Electrical installing the charger for my Ford Mustang Mach-E. The installation was done professionally, everything was neat and well organized, and the entire process was smooth from start to finish. The electrician was incredibly friendly, knowledgeable, and took the time to answer all of my questions. It’s clear they take pride in their work. I highly recommend Cornerstone Electrical to anyone looking for a reliable EV charger installation. Five stars all the way!”
“Great service and communication. I emailed them for a quote. I got a quick response back. I needed a EV charger installed and some breaker change in my panels. The job was quick and everything looks good and professional. I would definitely recommend them.”
“Excellent service / top-notch job completion. Was on time and completed the necessary work in a professional manner. Was very polite and great to work with. Would absolutely recommend.”
Quote your multifamily project with an electrician who's done this before
Send us plans or a site address and we'll come back with a clear itemized quote, a realistic schedule, and a list of what we need from the GC to start.
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