What do I need to add a steam shower in Toronto?

Adding a steam shower to your Toronto home is a significant but achievable renovation that combines plumbing, electrical, and waterproofing work — most homeowners will need licensed trades for at least portions of this project.

A steam shower differs from a standard shower in that it requires an airtight, fully waterproofed enclosure, a dedicated steam generator, upgraded electrical service, and specific plumbing connections. Getting these elements right from the start is critical — moisture failures in steam showers are expensive and damaging.

The Core Components You'll Need

The steam generator is the heart of the system. Residential units typically range from 7–18 kW depending on your enclosure size. A general rule of thumb is 1 kW per 45–50 cubic feet of enclosure space, plus extra capacity if you're using natural stone (which absorbs heat). Quality residential generators from brands like Mr. Steam, Thermasol, or Kohler run $1,500–$4,500 for the unit alone. The generator is typically installed in a nearby vanity cabinet or closet — it needs to be within 25 feet of the enclosure.

Waterproofing is non-negotiable and where many steam showers fail. Unlike a regular shower, steam penetrates grout and standard membranes over time. You'll need a continuous waterproofing membrane system (Schluter Kerdi, Laticrete Hydro Ban, or similar) on all six surfaces — floor, ceiling, and all four walls. The ceiling should be sloped at least ¼" per foot to prevent condensation drips. Porcelain or ceramic tile is preferred; natural stone requires sealing and adds heat load.

Permits and Trades in Toronto

This project will almost certainly require a building permit from the City of Toronto Building Division (416-397-5330 or toronto.ca/building), particularly if you're modifying plumbing drain/supply lines or altering the electrical panel. Expect 10–20 business days for permit approval on a straightforward bathroom renovation.

Electrical is a significant requirement. Steam generators need a dedicated 240V circuit, typically 30–60 amps depending on the unit. This work requires an ESA (Electrical Safety Authority) permit — your licensed electrician pulls this automatically. Do not skip this; an improperly wired steam generator is a serious fire and shock hazard.

Plumbing requires a licensed plumber to connect the cold water supply line to the generator (typically ½" copper or PEX) and ensure proper drain sizing in the enclosure. If your bathroom is in an older home in areas like The Annex or Leslieville, expect the possibility of upgrading aging supply lines while you're in the walls.

What It Typically Costs in Toronto

A complete steam shower installation in the GTA generally runs:

• Basic (prefab enclosure, entry-level generator, standard tile): $8,000–$14,000
• Mid-range (custom tile enclosure, quality generator, controls): $15,000–$25,000
• High-end (natural stone, premium generator, digital controls, bench, lighting): $28,000–$50,000+

These ranges include labour, materials, generator, permits, and trades. Toronto pricing runs 10–15% higher than other Ontario markets.

Your Next Steps

Start by having a plumber and electrician assess your existing bathroom — you need to confirm your panel has capacity for a new 240V circuit and that your drain can handle the enclosure size you want. Then engage a tile contractor experienced specifically with steam shower waterproofing; this is a specialty skill and worth asking about directly.

Browse qualified local contractors in the Toronto Construction Network directory to find plumbers, electricians, and tile setters in your area who have experience with steam shower installations.