Do Bathrooms Require 20-Amp Circuits in Ontario? (OESC 2025 Answer)

Bathroom outlets get abused daily — hairdryers, curling irons, space heaters, electric shavers, all often running at the same time. It is no surprise that homeowners ask whether Ontario code requires a 20-amp circuit in a bathroom, especially when older houses still run everything from a single 15-amp receptacle. This guide answers that question against the current Ontario Electrical Safety Code and explains why the rule differs from the US.

Quick Answer: Are 20-Amp Bathroom Circuits Required in Ontario?

No — the Ontario Electrical Safety Code (OESC), 28th Edition, does not require a 20-amp circuit in a residential bathroom. Rule 26-700(11) requires a dedicated branch circuit for bathroom receptacles, but it may be 15 A or 20 A.

That is the key difference from the US National Electrical Code, which mandates a 20-amp circuit under NEC 210.11(C)(3). If you have read US advice online, it does not directly apply to Ontario homes.

What the Ontario Electrical Safety Code Actually Says

OESC Rule 26-700(11) requires at least one branch circuit dedicated to bathroom receptacles. “Dedicated” means no lights, fans, or outlets in other rooms may share that circuit.

Rule 26-712 requires all bathroom receptacles within 1.5 m of a sink, tub, or shower to be Class A GFCI-protected, tamper-resistant, and installed no closer than 1 m from a bathtub or shower stall.

Why the “20-Amp Bathroom Circuit” Myth Persists in Canada

The 20-amp rule comes from the US NEC. Because a lot of DIY content, home-improvement videos, and even chain hardware stores default to US material, Ontario homeowners often get told the wrong number.

Practically, licensed electricians in the GTA still often install a 20 A dedicated circuit voluntarily. Modern hairdryers pull 1,500 W and a portable space heater can pull another 1,500 W — well over the 1,440 W continuous limit of a 15 A / 120 V circuit.

When You Should Choose 20 Amps Anyway

• New construction or full bathroom renovation — the small material upgrade is cheap during a rough-in.
• Homes with multiple bathrooms sharing one circuit — a 20 A dedicated circuit gives real headroom.
• Master ensuite with heated floors, towel warmers, or backlit mirrors — combined loads exceed a 15 A ceiling quickly.
• Basement wet-bar or laundry/half-bath combos — kitchen small appliance rules can piggyback on the bathroom circuit under Rule 26-712.

15-Amp vs 20-Amp Circuit: What Actually Changes

A 20 A circuit uses 12 AWG copper wire and a 20 A breaker, versus 14 AWG and a 15 A breaker for 15 A. The receptacle itself can still be a standard 15 A duplex if only one is on the circuit (OESC allows a 15 A receptacle on a 20 A circuit when only one duplex is present).

The bigger conductor also reduces voltage drop, which matters if the bathroom is far from the panel — a common issue in Toronto homes with a basement panel serving second-floor bathrooms.

Expert Insight: What ESA Inspectors Actually Check

Ontario ESA inspectors look for three things at the bathroom rough-in stage:

1. A dedicated branch circuit for the receptacles.
2. Class A GFCI protection (either the receptacle itself or the upstream breaker).
3. Tamper-resistant receptacles per Rule 26-712(c).

Missing any of the three is one of the most common failure notes ESA cites during pre-drywall inspections, based on their published Ontario Electrical Safety Report.

Common Bathroom Wiring Mistakes to Avoid

• Sharing the bathroom circuit with the hallway or hallway light (violates Rule 26-700(11)).
• Using a non-GFCI receptacle within 1.5 m of a sink.
• Putting an outlet on a switched half-hot circuit shared with a vanity light — allowed for lighting, but the receptacle must be on its own dedicated bathroom circuit.
• Installing a receptacle inside a shower or bathtub enclosure. Never allowed.

Do Hardwired Bathroom Fans and Heaters Count?

No. OESC 26-700(11) applies specifically to receptacles. Fans, heat lamps, and vanity lighting can share their own circuit, but they must not tap the dedicated bathroom receptacle circuit.

An exception exists for bathroom heaters over 1,500 W — they generally require their own dedicated 240 V circuit and a service calculation per Rule 8-200 (panel capacity).

When to Call a Licensed Electrician

If your bathroom trips its breaker, feels warm at the outlet, or the GFCI will not reset, do not just swap a bigger breaker. Overfusing a 14 AWG circuit with a 20 A breaker is an OESC violation and a proven fire cause.

EZ Smart Electric (ESA Licence #7012690) rewires and upgrades bathroom circuits to current code across the GTA. Call 416-838-9006 or visit our contact page to book a same-week inspection.

Frequently Asked Questions

Can I put a bathroom outlet on the same circuit as a bedroom?

No. OESC Rule 26-700(11) explicitly requires a dedicated branch circuit for bathroom receptacles. Sharing with a bedroom or hallway is a code violation and a common ESA inspection failure.

Does a bathroom outlet in Ontario have to be GFCI?

Yes. Rule 26-712 requires Class A GFCI protection on all bathroom receptacles within 1.5 m of a basin, tub, or shower — which is virtually every bathroom outlet in a typical home.

How much does it cost to add a dedicated 20-amp bathroom circuit in Toronto?

Adding a new dedicated 20 A circuit from the panel typically costs $450–$850 in the GTA, including permit and ESA inspection. Costs rise if walls need opening or the panel is already full.