Bathroom Renovation Planning: What to Decide Before Anyone Picks Up a Tool
Most renovation problems don’t start on site. They start three weeks earlier, when someone called for quotes on a job that wasn’t properly defined yet.
From the tradie’s side, it looks like this: a homeowner calls with a rough idea of what they want, the quoting trade fills in the gaps with assumptions, and by the time work starts those assumptions are wrong. Someone ends up paying for the difference — as a variation, a delay, or a fix.
Here’s what to sort out before that call.
Why Getting the Plan Right Matters More Than Getting the Design Right
The gap between what a homeowner pictures and what a tiler or plumber sees when they walk in is almost always scope. The homeowner is thinking about how the finished bathroom will look. The tradesperson is thinking about what’s behind the wall, what condition the substrate is in, and whether the drainage can stay where it is.
A quote without a defined scope produces one of two things: a number padded against unknown risk, or a number stripped of items the quoting trade is hoping to recover as variations once work has started. Neither of those is useful. Neither of them is the trade’s fault.
The plan doesn’t need to be complicated. It needs to be complete enough that anyone quoting knows exactly what they’re pricing.
Step 1: Define the Scope Before You Talk to Anyone
Scope isn’t design. It’s what the job actually includes — what’s coming out, what’s staying, what’s changing. A homeowner who knows they want a lighter, more modern bathroom hasn’t defined scope. A homeowner who knows they’re keeping the same layout, replacing all tiles, swapping out the vanity and tapware, and leaving the shower in the same position has.
The layout question matters more than most homeowners realise. Keeping the same footprint — same waste position, same plumbing locations — is the single biggest cost lever in a bathroom renovation. Moving a drain involves a licensed plumber, potential DA implications, and in some cases cutting into a concrete slab. That’s a different job from a same-footprint re-tile, with a different budget and a different timeline.
Wet area vs dry zone is worth understanding before you start calling trades. Under AS 3740, the wet area in a bathroom is defined — the shower enclosure, the bath, and the floor immediately adjacent. Different compliance requirements apply inside it vs outside it. Tile specification minimums change. Substrate requirements change. Licensed trade obligations change. If your renovation includes any work inside the wet area, it shapes the trade sequence and what you’re paying for.
Before calling anyone for a quote, be able to answer: what’s coming out, what’s staying, is the layout changing, what’s the wet area boundary. That’s enough to start.
Related: Understanding scope is the first input into realistic cost expectations. See our bathroom renovation cost guide ›
Step 2: Budget Ranges and What Moves the Number
Three scope tiers, three rough ranges. These aren’t quotes and they aren’t promises — they’re a frame for what’s realistic in NSW and ACT. Cosmetic refresh — tapware, vanity, toilet, fresh paint, no tile work: $3,000–$8,000. Mid-range full renovation — full re-tile, new fixtures, same layout: $12,000–$22,000. Premium or layout change — large-format tile, layout modification, high-specification fixtures: $22,000–$45,000 and up. The gap between the bottom and top of each tier is scope variation, not margin.
What adds cost without showing up in a design brief. Layout change — not just the plumber’s day rate, but the DA timeline, access costs, and in some buildings, the cost of cutting into a concrete slab. Waterproofing rebuild — if the existing membrane has failed, which is common in bathrooms over fifteen years old, a compliant waterproofing installation needs to be budgeted from scratch. Large-format tile — levelling compound, back-buttering, and a slower install rate per m² all add cost before a single fitting is chosen. None of this appears in a showroom.
What keeps cost down. Same-footprint renovation. Existing substrate in acceptable condition. Standard tile formats — 300×300 or 600×600 — rather than large-format slabs. No structural work. A homeowner who can confirm all four of those things is in the best position to get quotes that are accurate and comparable.
The point isn’t to lock in a number before quoting. It’s to know enough about what drives cost that the quotes you get back make sense when you compare them.
Related: Full cost breakdown by scope tier and trade type. See our bathroom renovation cost guide › · View full costs overview ›
Step 3: What Requires a Permit or a Licensed Trade in NSW and ACT
Three trades in a bathroom renovation require a licence regardless of job size. Waterproofing — a licensed waterproofer, in NSW and ACT. This is a separate licence from the builder’s licence, and it’s required under AS 3740 and referenced in the NCC. Plumbing — all drainage and water supply connections require a licensed plumber. Electrical — all fixed electrical work requires a licensed electrician. Tiling doesn’t require a licence in NSW. But waterproofing does. Those two trades share a site on almost every job — and the person laying tiles is not automatically the person holding a waterproofing licence, even if they’re on the same crew.
Most like-for-like residential bathroom renovations in NSW fall under exempt or complying development — no DA required. The triggers that push a renovation into DA territory: moving a wet area, structural work, heritage overlays, strata-specific by-laws or restrictions. In the ACT, the equivalent process runs through Access Canberra. If your renovation involves any of those, confirm with your local council or strata manager before work commences — not after the trades are booked.
Asking a contractor for their licence number before work starts is not an insult. It takes thirty seconds. A licensed contractor will produce it without hesitation.
Related: How to verify contractor licences in NSW and ACT. See our contractor licensing guide › NSW Fair Trading licence verification ›
Step 4: How a Bathroom Renovation Actually Sequences
A bathroom renovation doesn’t fail because one trade does bad work in isolation. It fails because one trade’s work creates a problem the next trade has to either work around or ignore.
Strip-out and waste removal
All existing fixtures, fittings, and tile work removed. Substrate condition assessed. Defects identified before the rebuild begins.
Rough-in — plumbing and electrical to wall
Services positioned for new fixture locations. Any drainage relocation done at this stage. First inspection point for some jurisdictions.
Substrate — fibre cement sheet, levelling
Compressed fibre cement sheet installed in wet areas. Levelling compound applied where required. Flatness tolerances depend on the tile format specified.
Waterproofing membrane — application, cure, inspection
Membrane applied to AS 3740 specification. Cure time observed before tiling proceeds — minimum 24–48 hours depending on product and conditions. Inspection required before tiling in some jurisdictions.
Tiling — floor and wall
Adhesive and tile installation in sequence. Back-buttering applied for large-format tiles. Movement joints installed at internal corners and changes of plane.
Fixtures and fittings
Vanity, toilet, shower screen, bath installed. Tapware connected and fixed. Any custom-order items need to be on site before this step starts.
Final fix — connections, silicone, clean
Plumbing and electrical connections completed. Silicone applied at movement joints. Grout sealed. Site cleaned. Defect inspection walk-through.
Waterproofing cure time is where shortcuts get taken most often and hurt most later. The membrane has to cure fully before tiling goes on top — typically 24 to 48 hours minimum, depending on product and site conditions. Tiling over wet or uncured membrane is a defect. The tiles go down, the bathroom looks finished, and three years later the wall cavity is wet and the tiles are lifting. You can’t see it happening from inside the finished room. Which is exactly why it’s worth asking about at the quote stage, before there’s a defect to manage.
Practical completion — all work done, fixtures installed, specification met — isn’t the same as final sign-off. Depending on scope and jurisdiction, a waterproofing inspection may be required before tiling, and a final plumbing and electrical inspection before occupation. Know where those inspection points sit in your specific renovation before work starts. Finding out they exist when the tiler arrives ready to lay is not how that conversation should go.
The sequence isn’t flexible. It’s not a preference. It’s what a compliant installation requires.
Step 5: How to Find and Vet a Renovation Specialist
Start with licence verification, not reviews. In NSW, contractor licences are searchable via the NSW Fair Trading licence check — by name or licence number, publicly, before you commit to anything. In the ACT, the equivalent is Access Canberra. The waterproofing licence in NSW is a separate category from the builder’s licence. Both matter in a bathroom renovation. Ask for both, verify both, and do it before any deposit changes hands.
A detailed quote is a scope document. It should itemise: strip-out and disposal, waterproofing specification (membrane type, coverage areas, cure time, inspection method), substrate type — compressed fibre cement in wet areas; standard plasterboard is not acceptable in a shower enclosure — adhesive type (flexible for large-format tiles or heated floors), tile supply and lay, plumbing rough-in and final fix, waste and drainage, grout and sealants, movement joints at internal corners and changes of plane, fixtures and fittings, electrical, site clean-up. If any of those aren’t in the quote in front of you, ask why before signing, not after work has started.
What low quotes are usually missing. Substrate preparation — levelling compound, sheet replacement — is the item most commonly absent from a quote that looks competitive. Waterproofing described as ‘waterproofing included’ without specifying membrane type or coverage areas is a placeholder, not a specification. Back-buttering for large-format tiles is time-consuming and sometimes quietly omitted from a tight quote. A price that’s $2,000–$4,000 below the others on a mid-range job is worth checking against those three items specifically.
In NSW, any contract over $20,000 requires the contractor to hold Home Building Compensation insurance. Ask for the policy number before signing. If the contractor goes insolvent or abandons the job mid-renovation, HBC insurance is what covers you. Without it, on a job above the threshold, you have no protection.
Related: Red flags in renovation quotes and contractor behaviour. See renovator red flags › Contractor licensing guide ›
Ready to Turn Your Plan Into a Quote?
Tell us what you’re working with. We’ll connect you with a specialist who can review the scope and quote the job properly.
Lifestyle Bathrooms is a referral and connector service, not a licenced contractor. We connect homeowners and property professionals in NSW and ACT with vetted renovation specialists.
The Planning Mistakes That Create the Most Expensive Problems
The conditions that cause the most expensive renovation problems are usually present from the start. They just don’t surface until later — typically, later enough that the fix costs significantly more than prevention would have.
Quoting before scope is locked
Three tradies for quotes before deciding whether the layout is changing means three different assumptions about the same job. One might have priced a same-footprint renovation. Another might have assumed a layout change. A third might have excluded waterproofing rebuild because they couldn’t tell from the brief whether the existing membrane had failed. None of those quotes are comparable — and none of them are wrong. The scope was never defined.
Choosing tiles before confirming substrate condition
Large-format tile on a substrate that needs levelling compound adds $800–$1,500 to the job before the first tile goes down. If the tile is already ordered and the tiler arrives to find the substrate isn’t flat enough, one of two things happens: the levelling work gets added as a variation, or it gets skipped and the tiles lippage. Both outcomes were avoidable. Confirm substrate condition and the tiler’s levelling spec before the tile order is placed — not after.
Signing off on waterproofing without a specification
‘Waterproofing included’ in a quote means nothing without a specification. Membrane type. Coverage areas. Cure time. How the waterproofing will be inspected. A waterproofing installation that fails inspection has to be redone — under the tile. In a bathroom where waterproofing has already been paid for once, that’s an expensive conversation. Ask for the spec before signing, not when there’s a defect to manage.
Related: The most common waterproofing shortcuts and what they lead to. See common waterproofing shortcuts ›
Signing a deposit without checking HBC insurance
NSW contracts over $20,000 require the contractor to hold Home Building Compensation insurance. It’s not optional, and the obligation exists regardless of whether the homeowner asks. But if they become insolvent or abandon the job without it, there’s no coverage. Ask for the policy number. Check it. It takes five minutes and it’s the kind of thing you only wish you’d done after it’s already too late.
Related: HBC insurance in NSW — what it covers and when it applies. See our HBC insurance guide ›
What to Have Ready Before You Request a Quote
Getting a useful quote starts before the tradesperson arrives.
Scope written down
What’s coming out, what’s staying, whether the layout is changing. Write it down before making a call.
Bathroom dimensions
Floor area, ceiling height, rough wall areas to be tiled. Approximate is enough to start.
Photos of current state
Walls, floor, existing waste locations, vanity, shower screen. One photo is worth three paragraphs of description.
Existing drainage locations
Where the waste outlet is, whether there’s a floor waste, approximate position of the shower drain.
Water pressure notes
If pressure is known to be low, flag it early. It affects fixture selection and sometimes requires remediation work.
Material preferences shortlisted
Tile style, format, and type. Vanity style. Tapware finish. Doesn’t need to be finalised — a direction is enough.
Budget range defined
Not a precise figure. A realistic range that reflects the scope and what you’ve read about cost expectations.
Timeline requirements
Hard deadlines (tenants, sales campaign, family events), preferred completion window, flexibility where it exists.
Building restrictions
Strata by-laws, heritage overlays, apartment access logistics, body corporate approvals if applicable.
Existing trades or suppliers engaged
If you’re supplying tiles yourself, or have an electrician already booked, the quoting tiler or builder needs to know. It affects pricing and trade co-ordination.
Common Questions
Depends on scope. A cosmetic refresh — tapware, vanity, toilet, no tile work — typically takes five to ten working days. A full renovation with a same-footprint re-tile runs three to five weeks. A layout change, or anything involving structural work, plumbing relocation, or DA approval, should be budgeted at five to eight weeks minimum.
What extends timelines beyond those ranges. Waterproofing compliance hold-offs, where the inspector isn’t available and work stops until sign-off. Custom-order tiles with six to twelve week lead times that weren’t factored into the program. Remediation work found on strip-out — failed waterproofing membranes, substrate damage, old asbestos materials — that wasn’t visible until the walls came down.
Build the timeline around the slowest element, not the fastest. If there’s a hard deadline — tenants moving in, a settlement date — work backwards from it, with contingency, before booking.
Most like-for-like residential bathroom renovations in NSW don’t require a DA. They fall under exempt or complying development — the work can proceed without council approval, subject to meeting the relevant standards.
The triggers that change that: moving the wet area to a different part of the bathroom, structural work, heritage overlays, strata-specific restrictions. In the ACT, confirm with Access Canberra. If your scope involves any of those elements, check with your local council before booking trades. Not after.
Three. Waterproofing — a licensed waterproofing applicator. In NSW, this is a separate licence from the builder’s licence. It’s required under AS 3740 and referenced in the NCC. Plumbing — all drainage and water supply connections require a licensed plumber. Electrical — all fixed electrical work requires a licensed electrician.
Tiling doesn’t require a licence in NSW. But tiling and waterproofing share a site on almost every bathroom renovation, and a tiler who claims to ‘include waterproofing’ without holding a separate waterproofing licence is not providing a compliant waterproofing installation. Confirm which licence covers which scope item before work starts.
A complete quote is a scope document. It should itemise: strip-out and disposal, waterproofing specification (membrane type, coverage areas, cure time, inspection method), substrate preparation and type, adhesive specification, tile supply and lay, plumbing rough-in and final fix, waste and drainage, grout and sealants, movement joints at internal corners and changes of plane, fixtures and fittings, electrical, and site clean-up.
When an item isn’t in the quote, it’s either not in scope or it’s being added as a variation once work starts. Substrate preparation and waterproofing specification are the two most commonly missing items in quotes that look competitive. Ask specifically about both before comparing numbers.
Compare labour rate per m² against known ranges for the tile type you’re specifying. Standard wall tiling runs $35–$60/m² labour. Floor tiling $45–$75/m². Large-format above 600×600: $65–$110/m². Natural stone: $80–$140/m². A quote significantly below those ranges for the tile type in your spec isn’t necessarily wrong — but it needs to be explained.
Check whether substrate preparation is separately itemised. If it’s not, ask whether it’s included and what the assumption is. Confirm the waterproofing specification is explicit — not just a line that says ‘waterproofing included’. Ask whether licensed trades are named and whether their licence numbers are available.
A quote that skips those items isn’t a competitive quote. It’s an incomplete one.