Key Takeaways
- The 2024 Ontario Electrical Safety Code (OESC), based on the 28th edition of the Canadian Electrical Code, came into effect on May 1, 2025 and applies to all electrical work performed after that date.
- The biggest changes for homeowners include expanded AFCI (arc-fault) protection, new EV charger plan review rules, stricter outdoor receptacle requirements, and a complete rewrite of residential energy storage system rules.
- Existing wiring does not need to be updated — but the moment you renovate, add a circuit, or upgrade a panel, the new rules apply.
- Expect roughly $200–$600 in extra electrical costs on a typical renovation due to AFCI breakers, GFCI outlets, and tamper-resistant receptacles.
- Every electrical contractor must hold a valid ECRA/ESA licence, and your work must be inspected by the Electrical Safety Authority before it can be legally energized.
What Changed in the 2024 Ontario Electrical Safety Code
Ontario adopted the 2024 Ontario Electrical Safety Code (OESC) — based on the 28th edition of the Canadian Electrical Code — and it came into effect on May 1, 2025. This is one of the most significant code updates in over a decade, and it’s now the standard enforced on every renovation, new build, panel upgrade, and EV charger installation across the province.
The Electrical Safety Authority (ESA) describes the update as a response to electrification, EV adoption, and emerging fire-safety data. If you’re renovating in 2026, hiring an electrician, or planning a future upgrade, here’s exactly what’s different — and why it matters for your wallet, your insurance, and your family’s safety.
Expanded AFCI Protection (The Biggest Fire-Safety Change)
Arc-Fault Circuit Interrupters (AFCIs) detect dangerous electrical arcing — the type of low-level sparking inside walls that causes most residential electrical fires. ESA’s own analysis of Ontario Fire Marshal data found that AFCI protection could reduce residential electrical distribution fires by up to 71%.
Under the 2024 OESC, AFCI protection is no longer limited to bedrooms. It’s now required across most finished living spaces:
- Bedrooms (as before)
- Living rooms, dining rooms, dens, and family rooms
- Hallways, closets, and similar finished areas
- All 15A and 20A, 125V circuits in dwelling units
AFCI breakers cost roughly $40–$80 each compared to $10–$15 for standard breakers, so a full kitchen or basement renovation may add $200–$500 to your electrical line item. The trade-off is fire prevention on the circuits where most house fires actually start.
Enhanced GFCI Requirements for Wet Areas and Outdoors
GFCI (Ground Fault Circuit Interrupter) protection has been broadened, particularly for outdoor and water-adjacent zones. New rules now require GFCI protection in additional locations where shock risk is highest.
Where GFCI is required under the 2024 OESC:
- All outdoor receptacles at single dwellings — including those that were previously exempt
- Bathrooms, kitchens (within 1.5m of a sink), laundry rooms, garages, and unfinished basements
- Block heaters and HVAC equipment — the previous exemption was removed in the prior cycle and remains in effect
- Cottage docks and boathouses, to prevent electric shock drowning
EV-Ready Wiring and New Plan Review Rules
With Canada’s ZEV mandate accelerating, the 2024 OESC introduces stricter rules around electric vehicle supply equipment (EVSE). Plan Review submissions are now required for certain EVSE installations, and demand load calculations for single dwellings have been revised to better account for EV charging loads.
For homeowners, this means a Level 2 EV charger installation must use a dedicated 40–50A, 240V circuit with proper wire gauge, GFCI protection, and full ESA approval. If you’re planning this upgrade, our guide on why EV charger installation is the home upgrade you can’t afford to skip in 2026 walks through the full cost and process.
Energy Storage Systems (ESS) — A Complete Rewrite
Home battery backup systems — Tesla Powerwall, Generac PWRcell, Enphase, and similar — have exploded in popularity. The 2024 OESC contains a complete rewrite of the installation requirements for residential energy storage systems, plus new rules for stand-alone electric-power-generating equipment.
If you’re adding a home battery, solar system, or backup ESS, expect:
- Mandatory Plan Review submission for certain installations
- Stricter clearance, ventilation, and placement rules
- Recognition of new energy management system types beyond EV-only EMS
Tamper-Resistant Receptacles and Outdoor Cover Plates
Tamper-resistant (TR) receptacles — the outlets with internal shutters that prevent children from inserting foreign objects — remain mandatory in dwelling units. The 2024 update also reinforces requirements for weatherproof “wet location” cover plates on outdoor receptacles, meaning your exterior outlets must remain protected even when something is plugged in.
These small components add only a few dollars per outlet but dramatically reduce shock and weather-related failures over the life of the home.
What This Means If You’re Renovating in 2026
Your existing wiring is grandfathered — you don’t need to rip open walls just because the code changed. But the moment you renovate a room, add a circuit, or upgrade your panel, the new rules kick in for that work. This is why hiring a licensed electrician matters: they pull the ESA permit, do the work to current code, and the ESA inspector signs off before the circuits can be legally energized.
Here’s the practical checklist before starting any electrical project this year:
- Verify your contractor’s ECRA/ESA licence at esasafe.com — every legitimate Ontario electrical contractor has one
- Confirm an ESA permit will be pulled — this isn’t optional, and unpermitted work can void your home insurance
- Ask for the inspection certificate after the work passes — keep it with your home records
- Budget an extra $200–$600 for code-driven items like AFCI breakers, GFCI outlets, and TR receptacles
For larger projects involving rewiring, panel upgrades, or new EV-ready infrastructure, working with an experienced licensed contractor like SiteTech Electrical ensures every circuit meets the 2024 OESC and passes ESA inspection the first time. And if your renovation involves a basement suite, our walkthrough on how to legalize a basement apartment in Ontario covers the ESA inspection process in detail.
The Bottom Line
The 2024 OESC isn’t just paperwork — it’s a meaningful upgrade to how Ontario homes handle fire risk, shock protection, EVs, and home batteries. The added cost on a typical renovation is small, but the safety and insurance benefits last for decades.
Whether you’re planning a kitchen reno, finishing a basement, adding an EV charger, or just replacing an aging panel, working with a licensed Ontario electrician — and confirming the work is inspected by the ESA — is the single most important step you can take to protect your home in 2026.
