What Affects the Cost
Layout and slab access. Moving waste pipes in a concrete apartment floor needs a different plan from working beneath a timber-floor terrace.
Room size and finishes. More tiling, a bath, a custom vanity or detailed tile patterns increase supply and installation work.
Older pipes. Have existing cast iron waste pipes and older supply lines assessed while they are accessible.
Apartment access. Lift protection, stairs, deliveries, parking and permitted work hours affect the schedule.
Hidden damage. Damp framing or damaged surfaces need repair before waterproofing and tiling.
A small ensuite renewed in the same layout with easy access may sit toward $10,200. A full bathroom with standard fixtures and straightforward replacement work is closer to $30,400. A layout change in a slab apartment, with pipe repairs, difficult access and custom finishes, can push toward $41,800 or beyond.
Small Bathrooms and Ensuites
A compact apartment bathroom or terrace ensuite still needs strip-out, plumbing, waterproofing, tiling, electrical work and fittings. Less floor area does not make that work proportionally cheaper. In an apartment, check access to pipes in the slab and arrangements for deliveries and waste; in a terrace, check narrow access paths and the condition of older pipes before settling the layout.
For context, a Sydney homeowner reported a $15,000 contractor's quote in 2025 for a unit bathroom with failed waterproofing and a layout change; another reported paying $30,000 in 2026 for a 5 m² bathroom gutted and redone with budget tiles, a new vanity and cabinet, and Caroma taps and toilet. These are individual experiences, not a Sydney small-bathroom price range. The national small-bathroom examples show how much the work and price can vary.
Sydney-Specific Considerations
Strata apartments. Bathroom work involving waterproofing needs a special resolution. Do not rely on the minor-renovation deemed-approval process. Responsibility for the membrane depends on the plan and by-laws; the NSW common property memorandum distinguishes original waterproofing from waterproofing installed later by an owner. Ask the strata manager about working hours, access protection and any requested reports or installation records.
Terraces in Paddington, Surry Hills, Balmain and Glebe. Narrow bathrooms and restricted delivery paths can matter as much as the plumbing. Timber floors may offer access below, while old waste pipes deserve inspection before the new layout is fixed. Keeping usable pipes and replacing deteriorated sections should be a decision based on their condition.
Western suburbs. Brick-veneer homes on slabs in Penrith, Blacktown and Liverpool can be straightforward when fixtures stay in place. A new toilet position can change that, because the waste connection may need concrete cutting and reinstatement.
Building approval. A bathroom renovation can be exempt development where it meets the conditions, including no wall reconfiguration, structural or fire-safety changes. Heritage items have different restrictions, and apartments have additional fire-safety conditions. Ask about your proposed work rather than assuming strata approval also settles building approval.
Sydney Water manages the sewerage network. Your plumber handles the applicable plumbing inspection documents, including a Notice of Work when fixture locations change, a Certificate of Compliance and a Sewer Service Diagram for drainage work.
Time without the bathroom. Plan for 3–6 weeks on site, with another bathroom available during the work. Custom vanities and stone tops can need 6–8 weeks to order before work starts. Confirm deliveries, apartment working hours and lift bookings before demolition; the national renovation sequence explains how the trades follow each other.
Hiring a Licensed Bathroom Renovation Contractor in NSW
Use a contractor whose licence covers the full renovation, or arrange the appropriately licensed trades yourself. Building Commission NSW regulates building and trade licences. A contractor licence is required above $5,000, including labour, materials and GST. Plumbing, draining and electrical work need specialist licences regardless of value; check the draining category when drains are altered.
Written contracts are required above $5,000, with major-work requirements above $20,000. Eligible contracts over $20,000 require Home Building Compensation cover. This is cover for specified circumstances where the builder cannot complete or remedy the work, rather than automatic payment for any defect. Separate trade contracts are not simply added together; staged contracts between the same parties can be.
An owner-builder permit applies above $10,000 only if the work needs development consent or a complying development certificate; a course is required above $20,000. It is not available for renovating a strata unit and does not authorise specialist plumbing or electrical work.
Worth checking:
The contractor's licence covers the renovation, with the specialist trades named and public liability and workers compensation arrangements confirmed.
The quote identifies fixtures, tile supply, waste removal, access arrangements and who coordinates the schedule.
Waterproofing licensing is checked for work above $5,000. Ask which certificate or installation records the waterproofer will provide, including product details and any strata-requested documents.
How We Calculate
The headline estimate uses homeowner reports of full single-bathroom renovations, adjusted for NSW and property age. The low end starts with the smallest reported full renovation since 2022, the typical price with the median, and the high end with the boundary of the upper quarter plus a small allowance. Trade allowances use the corresponding regional price ranges. All prices include GST.
The report section shows NSW reports, not Sydney-only reports. Those reports include quotes and prices paid; their summary is separate from the adjusted guide estimate. See the national guide for the full method and the comparison with jobs covering a bathroom plus another wet room.