What Affects the Cost
Property age and pipe condition. Inner-city terraces built before 1970 often have galvanised steel supply pipes or lead-soldered copper joints. Once exposed, these must be replaced with modern PEX or copper, adding $200–$500 in materials and labour.
Sink material and mounting. Stainless steel drop-in sinks are the simplest to install. Undermount sinks in stone benchtops require a stone mason for the cutout (separate trade, ~$200–$500). Fireclay farmhouse sinks weigh 30–50 kg and need reinforced
cabinetry support.
Access and space. Under-sink cabinets in Sydney kitchens, especially in older terraces and small apartments, are often tight. Adding an InSinkErator, filtration unit, and dishwasher waste spigot to the same space adds complexity.
Strata restrictions. Kitchen plumbing in strata buildings may involve common property risers or shared drainage stacks. Modifications to these require owners corporation approval and sometimes a strata plumber familiar with the building.
Scope bundling. Combining a tap replacement with a dishwasher connection and under-sink filter in one visit is more cost-effective than three separate callouts.
A like-for-like mixer tap swap in a modern kitchen with accessible shut-off valves sits toward $150. A sink replacement in an older terrace with galvanised pipes, plus a new dishwasher connection and filtration system, pushes toward $1,100.
Sydney-Specific Considerations
Inner west terraces (Balmain, Leichhardt, Newtown, Marrickville). Federation and Victorian-era terraces in these suburbs often have original galvanised steel supply pipes running through narrow wall cavities. When the kitchen plumbing is opened up for a tap or sink replacement, a good plumber will assess the visible pipework and recommend section replacement if corrosion is advanced. Full re-piping from the meter to the kitchen in these properties runs $1,500–$4,000 depending on access, but replacing only the section under the sink keeps costs manageable. Many terraces also have limited under-sink space because the kitchen was added to a rear extension rather than being part of the original floor plan.
Eastern suburbs and north shore apartments. Older unit blocks in Bondi, Randwick, and Mosman have cast iron waste stacks and copper risers that are shared between multiple lots. Kitchen sink waste connects to these shared stacks, and any modification may require notification to the strata manager. Newer high-rise buildings in Zetland, Mascot, and Rhodes have modern PVC waste systems with accessible under-sink connections, making tap and sink replacements straightforward.
Newer western suburbs (Oran Park, Marsden Park, Leppington). Homes built in the last 10–15 years have PEX supply lines, PVC waste pipes, and quarter-turn isolation valves as standard. Kitchen plumbing work in these suburbs is typically at the simpler and cheaper end of the range. The main variable is the benchtop material: engineered stone is standard in most new builds, and undermount sink replacement requires a stone mason for re-cutting.
Water quality. Sydney Water supplies some of the softest mains water in Australia (~50 mg/L hardness). This means less limescale buildup on tapware cartridges and longer mixer tap lifespans compared to Adelaide or Perth. Under-sink filtration in Sydney is typically installed for taste and chlorine reduction rather than hard water treatment.
Hiring a Licensed Plumber in NSW
All plumbing work in NSW must be carried out by a holder of a plumbing licence issued through NSW Fair Trading. If the job involves a gas cooktop connection, the plumber must also hold a gasfitting endorsement, or you will need a separate licensed gasfitter.
Worth checking:
Current NSW plumbing licence (verify online through the Fair Trading licence check)
Public liability and workers compensation insurance
Written quote that separates labour, materials, and fixture supply
Whether the plumber handles WaterMark-compliant fittings or expects you to supply them
For strata properties, confirm the plumber is experienced with shared drainage systems
A good plumber will inspect the existing isolation valves, supply hoses, and waste connections before quoting and flag anything that needs replacing to meet current standards.
How We Calculate
Estimates are based on current trade rates for licensed plumbers in NSW, adjusted for Sydney labour costs and typical material prices. All figures include GST. Ranges cover a straightforward like-for-like fixture replacement through to more complex work involving new connections, pipe section replacement, or multiple fixtures in one visit.