Kitchen plumbing is the part of a renovation that has to be right before anything else goes in. Cabinetry, benchtops and appliances are all set out around where the water, waste and gas land, and moving them afterwards means pulling the room apart again. Sedcon Plumbing handles kitchen renovation plumbing across Melbourne metro for homeowners, builders and property managers — rough-in through to final fit-off and compliance certificates.
What kitchen renovation plumbing covers
- Rough-in — relocating and running water supply, waste and gas to the new layout before cabinetry goes in.
- Sink and tap installation — undermount, drop-in and farmhouse sinks, mixers, pull-out and pot filler taps.
- Dishwasher connection — supply, waste and a correctly installed air break so waste water cannot siphon back.
- Gas cooktop connection — by a licensed gasfitter, with a compliance certificate.
- Filtered and boiling water taps — including under-bench units that need their own supply and drainage.
- Fridge water supply — a dedicated line for ice and chilled water.
- Waste and trap alterations — including relocating a floor waste or re-grading a run.
- Isolation valves — so a future repair does not mean shutting off the whole property.
Plan the plumbing before the cabinetry
The most expensive kitchen renovation mistakes are plumbing decisions made too late. A few worth settling early:
- Moving the sink to an island. Waste has to run under the slab or floor with adequate fall. On a concrete slab that means cutting and re-pouring, which is a significant cost. Decide before the cabinetry is set.
- Gas or electric cooktop. Induction removes the gas point but adds electrical load. If the property is moving off gas entirely, the supply should be capped properly rather than left live behind a cupboard.
- Boiling and filtered taps. These need an under-bench unit, a power point and space in the cabinet. Cabinetmakers need to know before they build.
- Dishwasher position. Too far from the waste and you get drainage problems that no amount of adjustment fixes.
- Old pipework behind the walls. If the kitchen is in a pre-1970s home, the wall is already open — that is the cheapest opportunity you will ever get to replace failing galvanised pipe.
How the job runs
- Plans and scope. Send us the kitchen layout and we will quote the plumbing scope and flag anything that needs resolving before demolition.
- Disconnection. We isolate and safely disconnect the old sink, dishwasher and gas before strip-out.
- Rough-in. New supply, waste and gas run to the agreed positions while walls and floors are open.
- Fit-off. Once benchtops are in, we install the sink, taps, dishwasher and cooktop and test everything.
- Certificates. Compliance paperwork for gas work, handed over with the job.
For builders and property managers
For builders, the value is that we hit the dates. Rough-in when the frame is ready and fit-off when benchtops land, with notice well in advance if anything on our end changes — not on the morning. See our builders and renovations page for how we work on a build program.
For property managers running a kitchen upgrade between tenancies, the constraint is usually the vacancy window. We schedule to it and coordinate around the cabinetmaker so the plumbing is not the thing holding up a re-let.
Frequently asked questions
Can I move my kitchen sink to a different wall or an island?
Usually yes, but the waste needs adequate fall to the existing drainage. On a timber floor with subfloor access this is straightforward. On a concrete slab it may mean cutting and re-pouring, which is a significant cost — worth pricing before you commit to the layout.
Do I need a licensed plumber to connect a dishwasher?
Yes. Dishwasher connection involves both water supply and waste, and it needs a correct air break to stop waste water siphoning back into the machine. It is licensed plumbing work.
What does kitchen renovation plumbing cost in Melbourne?
It depends entirely on whether services are staying put or moving. A like-for-like replacement of sink, tap and dishwasher is at the low end. Relocating the sink, adding a gas point and installing a boiling water tap is a much larger scope. We quote from the plans — see our Melbourne plumber cost guide for indicative ranges on individual items.
How many visits does a kitchen renovation need?
Usually two or three — disconnection before strip-out, rough-in while walls are open, and fit-off after the benchtop is installed. We book them against your program rather than turning up and waiting.
Can you cap the gas if we are switching to induction?
Yes, and it should be done properly rather than left capped behind a cupboard by whoever pulled the old cooktop out. We decommission and cap the supply and issue the paperwork. See our gas fitting page.
Planning a kitchen renovation in Melbourne? Send us the plans or call 0413 647 557. VBA Licence 120392, fully insured, servicing Melbourne metro.
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