Plumbing service
Kitchen remodel plumbing
Short answer
Kitchen remodel plumbing covers the sink drain and vent, water supplies to the sink, dishwasher, refrigerator and pot filler, the disposal, and gas for a range. Keeping the sink on the same wall is simplest; an island sink needs a drain run through the floor and a venting solution, which is one of the more involved kitchen plumbing changes.
Updated · Editorial team; not yet technically reviewed
Kitchen Remodel Plumbing at a glance
- Simplest
- Sink stays on the same wall; new fixtures on existing lines.
- Island sink
- Needs a floor drain route and an approved venting method.
- Appliances
- Dishwasher drain with an air gap or high loop as required locally, fridge water line, pot filler.
- Gas range
- Line sizing and a licensed gas installer; see gas line installation.
Sink location
Drains need a continuous slope and a vent. Moving a sink along the same wall usually means extending existing lines. Moving it to an island means running the drain through the floor (easy with a basement or crawl space, harder on a slab) and venting it. Traditional vents run up through a wall, which islands don't have, so island sinks use approved alternatives such as an island loop vent or, where local code allows, an air admittance valve.
Appliance connections
| Appliance | Needs | Watch for |
|---|---|---|
| Dishwasher | Hot supply, drain to disposal or sink tailpiece | Air gap or high loop, depending on local code |
| Garbage disposal | Drain connection, electrical | See disposal repair and installation |
| Refrigerator | Cold water line with an accessible shutoff | Braided lines are less fragile than thin plastic tubing |
| Pot filler | Cold supply to the range wall | Plan it before tile and backsplash |
| Instant hot / RO | Power and space under the sink | Cabinet space with a disposal installed |
What affects the cost
- Whether the sink stays on its wall or moves to an island
- Floor type below the kitchen (basement, crawl space, or slab)
- Number of appliance connections: dishwasher, fridge, pot filler, RO, instant hot
- Gas line changes for a new or larger range
- Replacing old drain and supply piping behind the sink wall
We don't publish prices; they vary by market. Get a written quote first.
Common questions
How much does it cost to move a kitchen sink?
It depends mainly on distance, the floor structure and venting. Moving along the same wall is usually far simpler than moving to an island, especially on a slab.
Can I put a sink in a kitchen island?
Yes, with a drain route through the floor and an approved venting method. It's easier over a basement or crawl space than on a slab.
Does a dishwasher need an air gap?
Some jurisdictions require a countertop air gap; others accept a high loop in the drain hose. Check local code or ask the plumber.