Bathroom Renovation FAQs — Costs, Timelines, Compliance and What to Expect
The questions every homeowner asks before they commit. Answered straight.
You’re not at the ‘just browsing’ stage any more. You want to know what this actually costs, whether you’ll need permits, and how to spot a dodgy tradie before handing over a deposit. Every question worth asking is answered below.
Costs & Budgeting
What a bathroom renovation actually costs in Australia — and what most quotes leave out.
Budget end — new fixtures, fresh tiling, updated vanity, nothing structural — runs $8,000 to $15,000. Mid-range, with quality tapware, a frameless shower screen and full retiling, sits between $15,000 and $25,000. Custom bathrooms with feature tiles, freestanding baths and high-end joinery push well past $25,000.
What actually drives the spread: condition of the waterproofing membrane underneath, whether the plumbing waste stays put, and your fixture choices. Move a toilet or relocate a floor waste and trade time climbs fast. Keep the plumbing where it is and the savings are real.
Waterproofing membrane upgrades when the existing substrate is compromised. Asbestos removal in pre-1990 homes, which is a separate licenced process. Structural wall changes if your layout needs load-bearing work. Fixture delivery fees, which some contractors bury or leave out altogether.
Before you sign, get written confirmation that the quote covers demolition waste removal, subfloor rectification found during demo, and the waterproofing inspection. Those three are where most variation claims originate.
Yes, but the return isn’t dollar-for-dollar. A solid mid-range renovation typically adds 60 to 80 cents for every dollar spent — so a $20,000 bathroom might move the sale price by $12,000 to $16,000. The return is better when the existing bathroom is visibly dated or water-damaged.
For rentals: keep it functional, clean, and photographable. A freestanding bath in a two-bedroom unit doesn’t justify the price tag.
Vague briefs produce vague quotes. Give the renovator: bathroom dimensions, photos of the current layout (including where the floor waste and plumbing sit), your fixture preferences or budget range, and a straight answer on whether the plumbing is moving or staying.
If you’ve already chosen specific tiles or a vanity, include the product codes. A renovator who quotes without asking any of this is pricing on assumptions — and assumptions become variations.
You can, but you carry the risk. Colour variance in a tile batch, a damaged tapware delivery, running short mid-install — any of those become your problem to resolve while the tradies are still on the clock.
If you’re sourcing your own materials: order at least 10% extra on tiles, lock in lead times before work is scheduled, and have everything on-site before demolition starts. There’s no version of this where tiles arriving on day three goes smoothly.
Not sure what your renovation will cost? Get a quote that breaks down every line item — waterproofing, labour, fixtures, and trades. No ballpark figures. Request a free quote ›
Timeline & Project Planning
How long a bathroom renovation actually takes — and what throws out the schedule.
Trades on-site for a full gut-and-rebuild: two to three weeks. That covers demolition, rough-in plumbing and electrical, waterproofing and the mandatory inspection, tiling, fixture installation, and final fit-off.
The part most people don’t budget for is lead time. Tiles on a four-week delivery. Vanities on backorder. Frameless screens fabricated to measure. Add it up and the real timeline — from contract sign-off to handover — is typically six to ten weeks. Finding that out mid-project is how renovations ‘go over’.
Two things. Late materials and surprises under the tiles.
Late materials is entirely preventable — lock in your tiles, vanity, tapware and screen before work starts, not after the bathroom’s already demolished. The second is harder to control. Demo opens up walls and floors, and sometimes what’s underneath isn’t what anyone expected. A renovator who builds schedule contingency for this is being honest with you. One who quotes a hard finish date with no mention of what happens if something’s found underneath — ask that question before you sign.
For most jobs, yes. But if you’ve only got one bathroom, you need a plan before work starts — not on day two when it’s already demolished. Some renovators will stage the work to keep a toilet accessible. Some push hard through the first week so you’re only without facilities for a few days. A handful of clients just book accommodation for the roughest stretch.
Whatever you agree on, get it confirmed in writing. ‘We’ll try to keep the toilet going’ is not a schedule item.
October through February is peak season for trades in NSW and ACT. Book in autumn or winter and you’ll usually get a faster start date, less schedule pressure, and sometimes sharper pricing when contractors are competing for work.
Temperature also matters for waterproofing cure times — most membrane products perform best between 15 and 25°C. Not a dealbreaker either way, but your renovator should be specifying the right product for conditions rather than just using whatever’s in the van.
Without a contract clause, your leverage is limited. ‘Reasonable time’ under the Home Building Act is the fallback, and that’s a slow argument in a dispute.
A signed contract should include a completion date, a written process for the renovator to notify you of any delays, and agreed consequences if that date is missed without cause. If a contractor resists putting a completion clause in writing, that resistance tells you something worth knowing before you hand over a deposit.
Licensing, Compliance & Permits
Licences, insurance, and approvals — what’s required in NSW and the ACT before work starts.
Yes. Plumbing, drainage, electrical, gas, structural work — all of it requires a licenced tradesperson in NSW. Unlicensed work voids your home insurance, creates liability that follows you at sale, and disqualifies you from Home Building Compensation if the project goes sideways.
Any renovation company managing multiple trades should hand over individual licence numbers without being asked twice. If they can’t, or won’t, that’s the answer. Learn more about contractor licensing ›
Most standard bathroom renovations in NSW are exempt development — same footprint, same wet area location, no structural changes, no DA required.
It gets more complicated when you’re moving plumbing, altering a load-bearing wall, adding a skylight, or working on a heritage-listed property. The NCC also sets minimum standards that apply regardless of whether a DA is required. Your renovator should confirm the development status for your specific job upfront. See NCC bathroom standards ›
HBC insurance is mandatory in NSW for residential building work where the contract exceeds $20,000. The contractor takes it out before accepting a deposit — not you.
It protects you if the contractor goes insolvent, dies, disappears, or loses their licence before finishing the job. Without it, you have no recourse against the Guarantee Fund if the project is abandoned or the work is defective and the contractor is no longer reachable.
Ask for the HBC certificate before paying any deposit on a job over $20,000. A legitimate contractor will have it ready. If they ask you to start before it’s issued — don’t. More on HBC insurance ›
Use the NSW Fair Trading licence register at fairtrading.nsw.gov.au. Enter the contractor’s licence number, confirm it’s current, check the class covers the work being done, and look for any conditions or suspensions.
A legitimate tradie hands you their licence number without prompting. A company registration is not a builder’s licence — ask for individual trade licence numbers for each person on the job. NSW Fair Trading licence register ›
Licensing in the ACT is managed by Access Canberra under the Construction Occupations (Licensing) Act 2004. There’s no single renovation licence — building work, plumbing, drainage, electrical, and gas fitting each have separate licence classes.
The ACT Owner-Occupier exemption doesn’t extend to licenced trade work. Plumbing and electrical must always be done by a licenced contractor regardless of who owns the property. Check Access Canberra’s register before work starts. ACT licensing requirements ›
Why homeowners trust Lifestyle Bathrooms
- Licenced under NSW Fair Trading — all trades verified
- HBC insurance confirmed on every eligible project
- AS 3740 waterproofing compliance standard met on every build
- All trades hold current individual licences
- Mandatory waterproofing inspections on every wet area
Waterproofing & Australian Standards
What AS 3740 requires, how inspections work, and what waterproofing failure actually costs.
Because when it fails, you don’t find out straight away. Water gets behind the tiles, into the substrate, into the framing — slowly, over months or years — before anything visible appears. By the time there’s a damp patch on the wall next door or a soft spot in the floor, the damage is already expensive.
Defective waterproofing is also a statutory warranty issue in NSW. The liability doesn’t expire when you sell — it follows the property for up to six years after the renovation is complete. See our AS 3740 waterproofing guide ›
AS3740 is the Australian Standard for waterproofing in domestic wet areas. It specifies the required membrane types for different substrates, minimum application thicknesses, coverage zones within the bathroom, and upstand heights at junctions.
The National Construction Code references AS3740 as the compliance pathway. That makes it effectively mandatory for all residential bathroom work in Australia. A renovation that doesn’t meet AS3740 doesn’t meet the NCC — regardless of how the tiling looks. Any renovator who can’t explain their waterproofing spec in relation to AS3740 is a problem. Read the AS 3740 guide ›
Yes, and this is non-negotiable. In NSW, waterproofing is a mandatory hold point under the NCC. A certifier must inspect and sign off on the membrane before a single tile goes down. Tiling over uninspected waterproofing is non-compliant work — full stop.
If your renovator is moving fast and tiles are going down without an inspection — stop the job. A tiled bathroom with no waterproofing inspection record has no defensible compliance history if a defect claim arises later. See building codes and hold points ›
Applied correctly to AS3740, a membrane should hold up for 10 to 15 years under normal residential use. That assumes the right product was selected for the substrate, junctions and upstands were properly formed, and the membrane was applied to the required thickness throughout.
It degrades faster with thermal movement in sun-exposed areas, substrate shrinkage in lightweight construction, or product mismatch. When it fails, the fix isn’t a patch — it’s ripping out the tiles and starting the wet area again.
AS3740 defines two zones. Zone 1 is direct water contact: the shower floor and shower walls to a minimum height of 1800mm. Full membrane coverage required — no gaps, no pinholes. Zone 2 is the splash zone beyond the shower: bathroom floor, bath surrounds, and wall areas with intermittent water contact.
The junctions — floor-to-wall, wall-to-wall, around the floor waste, around pipe penetrations — are where most waterproofing failures originate. Not in the middle of the membrane. At the edges. A proper spec addresses every junction type explicitly. AS 3740 zone requirements ›
Related: Wet area tile specification connects directly to waterproofing compliance. See our AS 3740 waterproofing compliance guide ›
The Renovation Process — What Actually Happens
The sequence of a bathroom renovation, who manages it, and what to have agreed before work starts.
Design and scope sign-off → materials procurement → demolition → rough-in (plumbing and electrical repositioned) → substrate preparation → waterproofing membrane applied → mandatory waterproofing inspection → floor tiles → wall tiles → fixture installation → final plumbing and electrical fit-off → silicone and grouting → defects check and handover.
Most homeowners don’t realise waterproofing inspection sits in the middle of that process — not at the end. Work stops. An inspector attends. Work resumes only after sign-off. Build contingency around this hold point. See building codes and hold points ›
A renovation specialist or builder coordinates the plumber, electrician, tiler and waterproofer — sequencing trades correctly, managing hold points, and keeping the project on schedule. That’s the standard arrangement and it works because there’s one person accountable for the whole job.
Hiring trades directly to cut costs makes you the project manager. Scheduling conflicts, defect disputes where each trade points at the other’s work, no single party with skin in the overall outcome — it’s a harder path than it looks for a project with as many compliance dependencies as a bathroom.
Wall tiles first, then the vanity, shower screen or bath, wet wall linings (fibre cement or compressed fibre), floor tiles, and finally the floor waste. The sequence matters — pulling wall linings before floor tiles can damage the floor waste junction.
A good renovator assesses what can be retained before pricing the job. If the floor waste position suits the new layout, keeping it in place saves plumbing labour and avoids disrupting the substrate. Every trade element you don’t move saves time on the rough-in.
Yes. And your choices directly affect the schedule, so make them early.
Popular tiles from major suppliers can run four to eight weeks. Custom vanities, specific tapware finishes, frameless screens made to measure — longer. Get a selection deadline from your renovator at the start of the project. If fixtures aren’t confirmed before demolition, you’re gambling that what you want is in stock when you need it.
A signed contract covering: a detailed scope of works (not just ‘bathroom renovation’), a fixed or capped price with a clear process for any variations, the payment schedule (in NSW, deposits are capped at 10% for jobs under $20,000, and progress payments must be linked to completion stages), a target completion date with a delay notification process, and the warranty terms.
Under the Home Building Act 1989 (NSW), a written contract is legally required for work over $5,000. If a contractor presents a one-page quote and asks you to proceed on a handshake, ask for the contract. If they won’t produce one, find someone who will. NSW Fair Trading contract requirements ›
Have a question about what your spec should include? We connect homeowners with experienced, vetted renovation specialists across NSW and ACT. Request a free consultation ›
Choosing the Right Renovator
How to vet a bathroom renovator, how many quotes to get, and what the red flags look like.
Six. Ask every one of them.
- What’s your licence number — NSW Fair Trading or Access Canberra?
- Is this job eligible for HBC insurance, and will you confirm it’s in place before I pay a deposit?
- Who does the waterproofing, and will there be a formal inspection before tiling?
- Do you use subcontractors? Are they individually licenced for their trade?
- How do variations get handled — written process, or costs just added on?
- Can I speak to someone whose bathroom you finished in the last six months?
A contractor who answers all six without hesitation is a different category from one who deflects or gets defensive about the licence question. Contractor licensing guide ›
Three. Fewer and you don’t have a reliable range. More and the returns diminish quickly — you’re just generating more paperwork.
The number matters less than consistency. All three quotes need to price the same scope to be comparable. If one contractor includes waterproofing membrane upgrades and the others don’t mention it, you’re not comparing three bathroom renovations — you’re comparing three different interpretations of a vague brief. Write it out. Send the same brief to all three.
Cash-only pricing. No written contract offered. Can’t or won’t provide a licence number. Asking for a deposit above 10% before work has started. No mention of waterproofing inspections anywhere in the quote or conversation. Pressure to start immediately before you’ve had time to review anything.
One of those — maybe. Two or more and you’re heading for a dispute. The homeowners who end up at NSW Fair Trading and the Civil and Administrative Tribunal almost always describe the same early warning signs they chose to ignore. How to report a building dispute ›
Not automatically. But a quote that comes in 30% or more below the others almost always means something is missing from scope — not that one contractor is dramatically more efficient than the rest.
The most common omissions in cheap quotes: waterproofing membrane priced to a basic spec when the substrate needs more, no allowance for waste relocation, and no contingency for subfloor damage found during demo. Ask the low-quoting contractor to walk you through their waterproofing specification and their variation process. That’s where the savings go.
Under the Home Building Act 1989 (NSW), statutory warranties apply automatically to all residential building work. Major defects carry a six-year warranty period. General defects — workmanship issues that don’t rise to the threshold of a major defect — are covered for two years. Both periods run from the date of completion, not the date you notice the problem.
Waterproofing failure is classified as a major defect. A claim on a failed membrane four years after handover is still within the statutory period. Your contract should also specify the contractor’s own workmanship warranty on top of the statutory minimum. Any contractor claiming the statutory warranty doesn’t apply to their work is wrong. Home Building Compensation insurance ›
Important: Quotes significantly below market rate that don’t itemise substrate preparation separately should prompt questions. See common renovator red flags ›