Toilet Installation in Toronto

Measuring rough-in

Before you shop, measure. Rough-in means the measurement from the finished back wall to the middle of the floor drain opening. With the old toilet still in place, measure from the wall (not the baseboard) to the centre of the bolt caps that hold the bowl down.

Most homes have a twelve-inch rough-in. Older Toronto houses sometimes have ten or fourteen inches, especially where bathrooms were added into a corner or under a stair. Buying a standard bowl for a ten-inch rough-in leaves the tank hitting the wall. Buying it for fourteen leaves an awkward gap.

Choosing a low-flow model

Toilets sold today in Ontario are low-flow, typically six litres per flush or less, with many high-efficiency models around 4.8 litres. Older toilets in the city can use thirteen litres or more. In a busy household that difference shows on the water bill.

Things to compare beyond flush volume:

• Bowl shape. Longer bowls sit better; round ones suit a cramped powder room.
• Height. Comfort-height seats help knees and older relatives.
• Trapway. A fully glazed, wider trapway clogs less.
• Independent testing. Look for published flush performance scores rather than marketing claims.

Flange and floor checks

Once the old toilet comes off, we look at what has been hidden. The flange is the ring that anchors the toilet to the drain. Cast iron flanges in older homes can be cracked or rusted thin; plastic ones can break at the bolt slots. Repair rings and spacers fix most problems.

The subfloor matters as much. A slow wax ring leak over years softens the wood around the drain. If the floor flexes when you rock on it, that rot must be addressed before a new toilet goes down, or the seal will fail again.

The installation steps

1. Shut the supply valve and drain the tank and bowl.
2. Disconnect the supply line and remove the old toilet.
3. Clean the flange, inspect it, and stuff a rag in the drain to block sewer gas.
4. Set new closet bolts and a wax or wax-free seal.
5. Lower the bowl straight down, level it with shims if needed, and snug the nuts evenly.
6. Attach the tank, a new braided supply line and, ideally, a new quarter-turn shut-off valve.
7. Fill the tank, flush a few times and inspect the base and supply line for drips.

Old shut-off valves are a frequent surprise. Multi-turn valves that have not moved in decades often weep or will not close fully. Replacing one during the swap costs little and saves a headache later. If the old toilet simply runs, see toilet repair first, since a new flapper may be all it needs.

The old fixture goes with us, or you can check City of Toronto guidance on disposal of porcelain items.