Bathroom renovation contractors in Australia typically charge A$65–$120 per hour for a qualified tradesperson, or quote a fixed price that embeds those hours plus project management. On a standard 5–6 m² renovation, the builder’s or project manager’s margin usually sits between 15% and 25% of the total contract value.
How contractors price work
| Model | Typical structure | When it suits |
|---|---|---|
| Fixed-price contract | Lump sum with progress payments | Defined scope, standard room |
| Cost plus margin | Trades at cost + 15–25% | Heritage or unknown conditions |
| Hourly / day rate | $65–$120/hour per trade | Small jobs, repairs, variations |
| Design and construct | Fixed price + design fee | Layout changes, custom joinery |
Trade rates by discipline
- Licensed plumber: A$90–$160/hour, call-out A$80–$150
- Licensed electrician: A$90–$150/hour, call-out similar
- Tiler: A$55–$95/m² labour, or A$65–$100/hour
- Waterproofer: A$45–$80/m², minimum charge often A$400–$700
- Carpenter: A$70–$110/hour
- Painter: A$45–$75/hour or A$20–$35/m²
- Demolition labourer: A$45–$70/hour plus disposal
What the contractor’s margin covers
It is not pure profit. It absorbs scheduling across trades, site supervision, warranty obligations, insurance, and the risk that a wall is out of square or a waste pipe needs replacing. A contractor quoting at 10% margin is either very efficient or planning to recover costs through variations — the second is far more common.
Red flags in a contractor quote
- No licence number or ABN on the document
- Large deposit (over 10–20%) before work starts
- No waterproofing certificate mentioned
- Allowances without rates (“tiles allowance” with no figure)
- Payment schedule front-loaded toward demolition
- No defects liability period stated
Comparing three quotes properly
Line up the scope item by item, not the totals. A A$19,000 quote and a A$24,000 quote can be the same job if the cheaper one excludes waterproofing certification, disposal or painting. Build a simple table: demolition, waterproofing, tiling, plumbing, electrical, fixtures, joinery, painting, contingency. Mark which quote includes each line and at what allowance. The differences usually explain the gap within minutes.
Domestic building insurance and permits
In Australia, residential work above a threshold value — which varies by state — requires domestic building insurance and sometimes a building permit. Ask the contractor which applies to your project and who lodges it. A contractor who cannot answer that question is not set up for domestic work.
Negotiating without breaking the job
The most effective lever is scope, not hourly rate. Keeping the layout, retaining sound tiling, choosing stock vanity sizes and buying fixtures yourself in the mid-range all reduce cost without squeezing the trades. Pushing the labour rate below market usually results in a faster, rougher finish — and the defects appear after the final payment.
Scheduling and lead times
The contractor’s programme is usually driven by trade availability, not by the work itself. In most Australian capitals, licensed plumbers and waterproofers are booked two to four weeks ahead in spring and early summer. A renovation quoted in November for a December start is likely to slip into January, and the slippage costs more than the quoted rate difference between two builders. Ask each contractor for their start date in writing and for the name of the plumber they will use.
Variations and how they are priced
A variation is any change after the contract is signed. Good contracts state the hourly rates and margin that apply to variations before work begins. Without that clause, a small change — an extra power point, a different tile layout — can be priced at a premium because the contractor knows the client has no alternative. Review the variation clause as carefully as the total price.
Insurance, licensing and paperwork
Ask for the contractor’s licence number, public liability certificate and, where the project value requires it, domestic building insurance. In several states the builder must give you a certificate before work starts and a defects document at completion. Missing paperwork is difficult to fix after the bathroom is demolished.
When an owner-builder arrangement makes sense
Managing trades yourself can save the builder margin — typically 15–25% — but transfers scheduling, sequencing and warranty risk to you. It works when you have time on site daily, a clear sequence, and trades you already trust. It fails when the tiler arrives before the waterproofer has cured the membrane.
Five questions before you sign
Ask who will be on site each day and who supervises. Ask which plumber and electrician will attend, and whether their licences will be supplied. Ask how variations are priced and at what margin. Ask what the payment schedule is tied to and what happens if a stage is late. Ask for the defects process in writing. A contractor who answers all five without hesitation is usually organised; one who deflects is telling you something about the build.
Fixed price versus time and materials in practice
Fixed price protects the budget but assumes the scope is settled. Time and materials protects the contractor but exposes the owner. Most domestic bathroom projects sit between the two: a fixed price for the wet-area scope, with provisional sums for plumbing and electrical work that cannot be assessed until demolition. Read which parts of the quote are fixed and which are provisional before comparing totals, because a low headline with large provisional sums is not a low price.
FAQ
How much does a bathroom renovation contractor charge?
Trade labour runs A$65–$120 per hour depending on discipline, and project management is typically built into a 15–25% margin on the contract value.
Is a fixed-price contract better?
It is better when the scope is fully documented. If the home is old or the layout is changing, a fixed price will include a risk premium that may exceed the cost of a cost-plus arrangement.
Should I pay a deposit?
A deposit covering materials is normal, typically 10–20%. Large upfront payments before demolition are a warning sign.
What warranty should I expect?
At minimum a defects liability period of 12 months on workmanship, plus statutory warranties that vary by state. Waterproofing commonly carries a longer manufacturer-backed warranty.
How these figures were compiled
Rates are 2026 planning estimates from published Australian trade rate guides and typical contract structures. Actual rates vary by state, trade availability and project size. They are not quotes.
Last updated: November 2026.