At a Glance
The plumbing side of a Sydney bathroom renovation runs $3,000–$8,000 per bathroom, covering rough-in pipework, drainage, and fixture installation. Tiling, waterproofing, and electrical are separate quotes. Costs jump when fixtures move from their original positions, especially on concrete slab floors in apartments.
What's Included in the Price
- Rough-in plumbing (first fix): new hot and cold supply lines, waste pipes, and floor waste to AS/NZS 3500 Plumbing and Drainage
- Fixture installation (second fix): toilet, basin, shower, and/or bath fitted after tiling is complete
- Isolation valves for each fixture
- Pressure testing and drainage compliance checks
- Two visits minimum: rough-in before waterproofing and tiling, fit-off after
- Removal of old fixtures and capping of redundant pipe runs
What Affects the Cost
- Layout changes : moving a toilet or shower even 500mm on a concrete slab requires cutting the slab and re-routing waste lines, which can double the plumbing cost for that fixture
- Building construction : Sydney has a mix of concrete slab apartments, brick-on-slab houses, and timber-floor terraces, each with different access and complexity
- Pipe condition : pre-1970s buildings may have galvanised steel or lead supply pipes that should be replaced with copper or PEX during the renovation
- Number of fixtures : a full bathroom (toilet, basin, shower, bath) costs more than an ensuite (toilet, basin, shower)
- Strata requirements : apartments typically need strata approval, waterproofing certification from a licensed applicator, and sometimes noise-restricted work hours
- Access for waste : upper-floor bathrooms in multi-storey homes need careful planning for drainage falls and may require access through the ceiling below
A fixture-in-place renovation in a timber-floor terrace with good sub-floor access sits toward $3,000. A full layout change in a concrete slab apartment, with slab cutting, cast iron pipe replacement, strata coordination, and restricted work hours, pushes toward $8,000.
Sydney-Specific Considerations
Sydney's building stock creates distinct plumbing challenges depending on location. Inner-city terraces in Paddington, Surry Hills, and Balmain typically have small bathrooms with original cast iron waste pipes. These narrow footprints leave little room for layout changes, but the timber floors provide good sub-floor access for pipe runs.
Apartments are the most complex scenario. Concrete slab construction means any fixture relocation requires slab cutting, which is noisy, dusty, and expensive. Strata committees often require a waterproofing certificate from a licensed applicator before tiling can proceed, and some buildings restrict renovation work to weekday business hours. Sydney Water manages the sewerage network, and drainage modifications connecting to the sewer may need to be coordinated through your plumber.
Sydney's western suburbs, built predominantly in the 1970s–90s (Penrith, Blacktown, Liverpool), have brick-veneer homes on concrete slabs with copper supply pipes. These are generally the most straightforward renovations if fixtures stay in place.
For any pre-1970s Sydney property, expect to encounter galvanised steel or potentially lead supply pipes. These should be replaced as part of the renovation, not just connected to. The cost of replacement is better absorbed into a renovation budget than addressed as a standalone job later.
Hiring a Licensed Plumber in NSW
All plumbing work in NSW must be carried out by a licensed plumber. Verify credentials through NSW Fair Trading.
Confirm with your plumber:
- Current NSW plumbing licence (not just a general builder's licence)
- They will provide a Certificate of Compliance for the plumbing work
- Public liability and workers compensation insurance
- Clear scope document separating plumbing from waterproofing, tiling, and electrical
Get a written quote that itemises rough-in and fit-off stages separately. Bathroom plumbing is predictable enough to quote accurately once the layout is confirmed. Avoid plumbers who cannot provide a fixed price for defined scope.
How We Calculate
Estimates are based on current licensed Plumber rates in the Sydney metropolitan area, standard material costs, and typical renovation complexity. All prices include GST. The range reflects the difference between keeping all fixtures in place (lower end) and relocating fixtures with slab cutting (upper end). Tiling, waterproofing, and electrical costs are excluded.