What are the current Ontario Electrical Safety Code requirements for bathroom lighting zones — how close can a light fixture be to the shower or tub?

In Ontario, bathroom lighting placement is governed by the Ontario Electrical Safety Code (OESC), which divides the bathroom into zones based on proximity to water sources — and the rules are strict because water and electricity in close quarters are genuinely dangerous.

The OESC adopts the zone-based approach used in IEC standards, dividing the bathroom into three zones around tubs and showers. Understanding these zones determines what types of fixtures are permitted where, and getting this wrong is both a code violation and a serious safety hazard.

The Three Bathroom Zones

Zone 0 is the interior of the tub or shower itself — inside the basin or shower floor and walls up to the showerhead height. Only fixtures specifically rated IPX7 (submersible) are permitted here, and they must be 12V maximum supplied by a safety isolating transformer located outside the zone. In practice, the only fixtures you'll see in Zone 0 are specialty in-tub LED lights or underwater shower floor lighting in high-end custom showers. Standard light fixtures have no place here whatsoever.

Zone 1 extends from the rim of the tub or the threshold of the shower enclosure up to 2.25 metres (roughly 7 feet 4 inches) above the floor, covering the space directly above the tub or shower. Fixtures in Zone 1 must be rated IPX4 minimum (splash-proof from any direction). This means a standard pot light or pendant fixture cannot be installed directly above your tub — it must be a fixture specifically rated for wet or damp locations. Recessed pot lights in Zone 1 must carry an IC-rated, airtight, wet-location listing. Many GTA homeowners and even some contractors get this wrong, installing standard pot lights directly above a soaker tub — this is a code violation that an ESA inspector will flag.

Zone 2 extends 600mm (about 24 inches) horizontally beyond the rim of the tub or the outer edge of the shower enclosure, and from the floor up to 2.25 metres. Fixtures in Zone 2 must be rated IPX4 minimum as well. So a vanity light bar mounted on the wall beside a tub, if it falls within that 600mm boundary, needs to be a damp-location-rated fixture — not a standard interior fixture.

Beyond Zone 2 — anything more than 600mm from the tub or shower edge and above 2.25 metres — is considered the general bathroom area. Standard interior-rated fixtures are permitted here, though all bathroom lighting circuits must still be GFCI-protected per the OESC.

What This Means Practically for GTA Bathrooms

The most common violation in Toronto-area bathroom renovations is a standard recessed pot light installed directly over a soaker tub in a master ensuite. Freestanding soaker tubs are one of the most requested features in GTA master ensuite renovations right now, and homeowners often want a dramatic pot light or chandelier directly above the tub. That fixture must be wet-location rated — full stop. A standard Halo or Lithonia pot light is not sufficient, regardless of how many times a contractor tells you "it'll be fine."

For condo bathrooms, the ceiling height constraint matters too. Many Toronto condos have 8-foot or 9-foot ceilings, which means the Zone 1 boundary (2.25 metres) extends very close to — or in some cases reaches — the ceiling directly above the shower. Any recessed lighting in that ceiling area above the shower needs wet-location-rated fixtures.

Practical tips for your renovation: When selecting pot lights for a bathroom with a tub or shower, look for fixtures explicitly labelled "wet location" or "shower rated" — not just "damp location," which is only sufficient for Zone 2. Brands like Halo, Lithonia, and Nora all make shower-rated recessed fixtures. Expect to pay $40-$120 per fixture for a quality wet-location-rated pot light versus $15-$40 for a standard pot light. The price difference is worth it — a failed ESA inspection means your electrician returns for a re-inspection visit, and any fixtures installed in the wrong zone need to be replaced before the work is approved.

All bathroom lighting circuits require GFCI protection, and any new or modified lighting circuits require an electrical permit and ESA inspection before the ceiling is closed up. Never let a contractor skip the ESA inspection on bathroom electrical work — that inspection is your protection.

If you're planning a bathroom renovation and want to connect with a licensed electrician familiar with OESC bathroom zone requirements, Toronto Bath Remodeling can match you with local professionals through the Toronto Construction Network. You can also browse contractors directly at torontoconstructionnetwork.com.