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Electric Heated Tile Floor Cost in Ontario (2026): $14 a Square Foot Installed, the $900 Minimum, Thermostats, What It Costs to Run, and When You Want Hydronic Instead
Flooring & Tile
Electric Heated Tile Floors: $14 a Square Foot, a $900 Minimum, About a Dollar a Day to Run, and the Question of Whether You Want Hydronic Instead
An electric heated floor is a resistance wire in a mat, set in thinset under the tile, run by a thermostat with a sensor in the floor. It is comfort heat for a bathroom, not a heating system for a house, and once you accept that it is one of the better things you can add to an ensuite for under $1,500. I build whole houses on hydronic slabs, so I am not the natural salesman for electric mats, but in a bathroom over a wood-framed floor they are the right tool, and here is what they cost to buy, to run and to get wrong.
The numbers
$14per sq ft of heated area, mat, thermostat, electrician
$900minimum charge
12 Wper sq ft, the usual mat
$1,120an 80 sq ft heated ensuite
| Bathroom | Room area | Heated area | Heated floor | Tile over it, mid porcelain |
|---|---|---|---|---|
| Powder room, 5×6 | 30 sq ft | 18 sq ft | $900 (minimum) | $475 |
| Main bath, 5×8 with tub | 40 sq ft | 24 sq ft | $900 (minimum) | $630 |
| Ensuite, 10×12 with shower and vanity | 120 sq ft | 80 sq ft | $1,120 | $1,890 |
| Big ensuite, 12×16, double vanity | 192 sq ft | 130 sq ft | $1,820 | $3,025 |
Heated area is the floor you stand on: not under the vanity, toilet, tub or shower base. Tile at $15.75 a square foot installed on the room area, from the tile cost page. The tile and shower calculator has the heated floor as a line item.
What you are buying
The mat is a fibreglass mesh with a heating cable woven through it at a fixed spacing, which is how the output lands at about 12 watts a square foot. The electrician rolls it out, cuts the mesh (never the cable) to turn corners, tests the resistance before, during and after the tile goes down, and runs the lead to a thermostat with a built-in GFCI. The thermostat has a floor sensor in the thinset, so it is controlling the tile temperature, not the air. The tile setter beds the mat in thinset or self-levelling compound and tiles over it.
The other way to do it is a cable clipped into a studded uncoupling membrane, the Schluter Ditra-Heat type. It costs more, maybe $17 to $18 a square foot by the time the membrane is in, and it gives you crack isolation and heat in one layer, which is what I use on a heated bathroom over a plywood floor. Over a wood floor the membrane earns its money; over a slab the mat alone is fine.
Up to about 150 sq ft of mat runs on one 120-volt circuit. Past that the electrician goes to 240 volts or a relay, and a dedicated circuit from the panel is normal either way. If the panel is full, add a few hundred dollars. The ESA permit is part of the electrician’s price and you should see the sticker.
What it costs to run
An 80 sq ft ensuite at 12 watts a square foot draws 960 watts when it is on. On a programmed thermostat that warms the floor for the morning and the evening and holds it the rest of the time, the mat cycles and runs the equivalent of five or six hours a day in winter: call it 5.5 kWh. At a blended Ontario rate around 16 cents, that is about 90 cents a day, $25 to $30 a month in the cold months and a few dollars in summer, when most people turn it off. A powder room is a third of that.
Where it gets expensive is when somebody uses an electric floor as the heat for the room. Then it runs all day, and 960 watts for 16 hours is 15 kWh and $2.50 a day. An electric floor should be the thing that makes the tile pleasant at 6 a.m., with the house heating doing the heating. If you want the floor to heat the room, that is a different conversation and it is the one on the electric vs hydronic page.
The rule I give every client: electric for one or two bathrooms over a framed floor; hydronic for a basement, a whole floor or a whole house. Electric mats under a big area are cheap to install and dear to run; a hydronic slab is dear to install and cheap to run. The hydronic cost page has those numbers.
The temperature rule still applies
Under tile, the mat can run as warm as you can stand, and most thermostats cap it around 30 to 32 C for comfort. Under anything else the same question comes up as over a hydronic slab: the sheets for wood, laminate and vinyl cap the surface at 27 to 29 C, and the warranty hangs on that number. On the slabs we build the water goes in at about 40 C, the concrete spreads it out and the surface runs an even 30 to 37 C across the room, which thirty years of floors say is fine; an electric cable has no concrete to spread anything, so it makes a hot line every 3 in. with a cooler line between, and that is a different animal. That is why most vinyl plank makers will not allow a mat directly under a floating floor, and why laminate over electric is a warranty problem. If you want warm vinyl or wood, it is a hydronic slab or a sheet of self-levelling compound over the mat, and even then read the sheet. The radiant compatibility article lays out the rule for every floor type.
Where it goes wrong
- Nobody tested the resistance. The mat gets tested out of the box, after it is laid, and after the tile is grouted. Skip the middle test and a nicked cable gets found after the tile is in, which is a floor coming up.
- The sensor is next to the cable, or under the vanity. It reads hot and the floor never comes on, or reads cold and the floor runs forever. It goes between two cables, in the open floor, in a conduit so it can be replaced.
- Mat under the toilet or vanity. Heat with nowhere to go. The cable overheats and fails, and the fix is the same floor coming up.
- A floating floor over it. Covered above. Tile, or stone, or a thinset-bedded floor the maker approves in writing.
- The electrician left before the tile setter arrived. Somebody has to own the mat between trades. A dropped trowel through the cable is the commonest failure and the two trades blame each other.
- No photo before tile. Take one of the mat layout with a tape in the frame. Ten years from now when you drill for a grab bar, you will want it.
Questions people ask
How much does a heated bathroom floor cost in Ontario?
$14 a square foot of heated area supplied and installed by an electrician with a programmable thermostat, $900 minimum. A 5×8 bathroom is the minimum; a 10×12 ensuite with 80 sq ft of open floor is about $1,120, plus the tile.
How much does it cost to run a heated floor?
About 12 watts a square foot while it is on. An 80 sq ft ensuite on a morning-and-evening program uses roughly 5 to 6 kWh a day in winter, under a dollar a day at Ontario rates, and much less in summer. Used as room heat all day, three times that.
Can you put electric floor heat under vinyl plank or laminate?
Most makers say no to a mat directly under a floating floor, because the cable makes hot lines and the surface passes the sheet’s 27 to 29 C locally, with no concrete to even it out. Some allow it over a layer of self-levelling compound. Under tile is where electric mats belong; for warm vinyl or wood over a whole floor, a hydronic slab.
Does a heated floor need its own circuit?
Usually yes, and the thermostat has a built-in GFCI as the code requires. Up to about 150 sq ft of mat runs on a 120-volt circuit; bigger floors go to 240 volts or a relay. A licensed electrician and an ESA permit are not optional.
Should I put a heated floor in a new house with a heated slab?
No. If the slab is hydronic the bathroom floor is already warm. We do not put electric mats in our ICF houses except, now and then, in a second-floor ensuite over framing where the slab heat does not reach.
Price the bathroom floor, heat included
The tile and shower calculator prices the floor tile, the heated mat, the shower and the waterproofing in one number for your room sizes.
Sources and further reading
- Nuheat: electric floor heating mats and thermostats; the installation manual covers embedding, sensors and the floors it can go under.
- Schluter Systems Canada: the Kerdi shower system and Ditra uncoupling membrane installation handbooks, with the drain, curb and flood-test details.
- Ontario’s Building Code: the official page with the current regulation; stair dimensions, bathroom finishes and floor framing are in Part 9.
