What we connect
- Undermount and drop-in sinks, single or double bowl.
- Kitchen faucets, including pull-down and filtered models.
- Dishwasher supply, drain and high loop or air gap.
- Refrigerator ice and water lines.
- Food waste disposers and their electrical cords to a proper outlet.
- Island sinks with their own venting arrangements.
Island sinks
An island has no wall to carry a vent, which complicates the drain. Depending on the layout and what the local code allows, the solution may be an island fixture vent loop or a mechanical vent where the code accepts one. That is settled with your designer before cabinets are ordered, because the drain often needs to come up through the floor in a particular spot.
Clues pointing to kitchen plumbing
- A drip that keeps going after the handle is firm.
- Handle that is stiff or spins without stopping flow.
- Water marks on the cabinet floor under the sink.
- Shower that swings hot and cold mid-rinse.
Fitting a new sink and counter
- Disconnect and cap supplies and drains before the old counter comes out.
- After the new counter is installed, mount the faucet and sink accessories.
- Fit the basket strainers or disposer flange on putty or gasket.
- Build the trap with correct slope to the wall, and connect the dishwasher drain.
- Test every connection with both bowls full and the dishwasher on a drain cycle.
| Item | Common mistake we correct |
|---|---|
| Dishwasher drain | No high loop, letting sink water back up |
| Trap arm | Running uphill to the wall |
| Supply stops | Old multi-turn valves left in place |
Related services
For gas ranges, see gas line installation. For disposers, see disposer installation, and for blockages, kitchen drain cleaning.
Markham note: village-core houses tend to hide cast iron and galvanized behind plaster, while Cornell and Box Grove builds run PEX to a manifold. We ask the year your house was built so the right fittings ride along on the truck.
Straight from the phone log
Could the sink go in the new island?
In most houses, though it means fresh drain and vent piping beneath the floor. We assess the basement ceiling below first.
Do I need a plumber for a dishwasher swap?
Not always, but the supply and drain connections are where leaks start. We check the high loop and stop valve while there.
Ready to get it fixed?
One call, a clear explanation, and work finished tidily before we leave.