Small Bathroom Renovation Cost VIC 2026 - Complete Pricing Guide

Small Bathroom Renovation Costs in Victoria for 2026

A small bathroom in Victoria costs $14,500 to $24,000 to rebuild on its existing footprint. A cosmetic refresh that leaves sound waterproofing undisturbed runs $6,500 to $12,000, relocating the toilet or the shower lifts the figure to $19,000 to $30,000, and a premium small bathroom with frameless glass, a stone top and underfloor heating reaches $24,000 to $36,000. Per square metre those figures work out at $4,200 to $7,200 for a small bathroom against $3,600 to $5,400 for a standard one, and that inversion is what this page is about. The reason a small room costs more per square metre than a large one is that a bathroom is mostly fixed costs. Waterproofing materials come in whole units and the membrane needs curing time between coats regardless of area.

A plumber attends three times and an electrician twice whether the room is three square metres or ten. Demolition strips the same number of fixtures. There is a specifically Victorian version of this problem too, and it sits in the waterproofing rules: the guidance applied here requires a waterstop at a 1500 millimetre horizontal radius from the shower rose, and in a three square metre bathroom that radius covers very nearly the whole floor. What Victoria does give small bathroom owners is a better set of protections than most states, and they start at a much lower dollar figure. Plumbing work above $750 requires a compliance certificate, which carries six years of insurance behind it. A contract above $10,000 must be a major domestic building contract.

Domestic building insurance becomes compulsory above $16,000. A typical Melbourne small bathroom clears all three, which means the paperwork on an ordinary job is genuinely worth something and not a formality. The construction story here is timber. A large share of Melbourne's established housing is weatherboard or brick veneer sitting on stumps, and countless inner-suburban bathrooms were tacked onto the rear of a nineteenth century cottage decades after the cottage went up. A timber floor moves, and a waterproofing membrane does not forgive movement, so the substrate work under a Melbourne bathroom is frequently the difference between a job that lasts twenty years and one that stains the hallway skirting in year four.

Why a Small Bathroom Is Not a Small Job

Take a 3.2 square metre bathroom, a common enough size in a Melbourne brick veneer from the 1960s or a period cottage in Fitzroy. It has a shower, a toilet, a basin, one window and one door. Everything about it suggests a quick job. Then count what has to happen in it: a strip-out, substrate preparation, plumbing rough-in, electrical rough-in, sheeting, waterproofing across two coats with curing between them, screeding, floor and wall tiling, grouting, glazing, fit-off, painting and a final clean. That is eleven or twelve distinct operations involving five trades, and not one of them gets shorter because the room is small. Wall tiling is where owners most often miscalculate.

A 3.2 square metre floor sounds like a small tiling job until you notice that walls go upward. Tiled to a 2400 ceiling, a room of those dimensions carries roughly 20 to 26 square metres of wall tiling, which is six to eight times the floor area. Tiling is therefore a larger line item than most people expect and the one where a quoted lump sum with no quantity behind it should prompt a question. Rates by format and layout are set out in our bathroom tiling detail. The Victorian waterproofing geometry makes the fixed-cost problem worse in a way that repays a moment's attention.

Guidance applied in this state requires the shower floor to be waterproofed within a 1500 millimetre radius of the shower connection, with a waterstop at that radius and falls to the floor waste between 1:80 and 1:50. Draw a 1500 millimetre circle from the shower rose in a bathroom 1.8 metres wide and you have covered the floor, the door threshold and a good portion of two walls. There is no small version of that job. Detail on the membrane itself sits in our bathroom waterproofing guide for Victoria.

Trade attendance is the other half. Each visit carries travel, setup and a minimum charge, and a small bathroom needs the same number of visits as a large one. A plumber comes for the strip-out disconnection, the rough-in and the fit-off. An electrician comes for rough-in and fit-off.

A tiler works across several days with the waterproofer between them. Six or seven separate attendances is normal, and on a job of this size those minimums make up a meaningful share of the total instead of a rounding error. What does scale down is quantity. Fewer tiles, one vanity, one toilet, one screen, one set of tapware. That is why the sensible strategy in a small bathroom is the opposite of the instinctive one: spend on the fittings, because there is only one of each and you stand within arm's length of all of them, and do not spend on moving services, because that is where the money disappears without anything to show for it.

Component Costs for a Melbourne Small Bathroom

The table below prices each component for a Melbourne metropolitan bathroom of three to four square metres, with the range for a house on timber floors and the range for an apartment on a concrete slab, since those two situations behave differently at almost every line. Roughly 60 per cent of the total sits in work that disappears behind the tiles.

Add the midpoints on a house bathroom where nothing moves and the total sits near $17,500, which is where a large share of Melbourne jobs actually land. The apartment column runs higher for access reasons instead of construction ones, and the timber floor column carries a substrate risk the apartment does not. A quote that has not inspected the subfloor on a period house has left that figure blank. Where the finished floor level needs correcting before tiling, floor levelling and screeding is priced separately.

Notice how little of the total is made up of the things an owner chooses. Vanity, toilet, screen, tapware and accessories together account for around a fifth of the job even when specified generously, which is precisely why it pays to buy well in a room this size. Pricing for the wet trade sits separately in our bathroom renovation plumbing detail.

Timber Floors, Stumps and the Melbourne Substrate Problem

A waterproofing membrane is a thin flexible skin bonded to whatever is underneath it. If that substrate moves, the membrane is asked to stretch, and at a junction or a penetration it eventually will not. This is the central technical risk in a Melbourne bathroom, because a very large share of the city's established housing sits on timber floors over stumps, and a great many inner-suburban bathrooms were built onto the back of a Victorian or Edwardian house as a later addition with its own footings and its own settlement history. Three things go wrong.

Stumps settle unevenly, so the floor has a gentle fall in a direction nobody intended and the falls to the waste fight it. Joists at wide centres deflect under a tiled floor and a person standing on it, and deflection cracks grout before it cracks tiles. And the timber immediately around an old floor waste or an old shower base is frequently the wettest part of the house, because that is where decades of minor leakage has gone, so what looks like sound flooring under the tiles turns out to be soft when the strip-out reaches it. None of this is exotic and none of it is expensive to fix at the right moment. Restumping or packing under a bathroom, sistering or adding joists to reduce deflection, and replacing rotted bearers or flooring around the waste typically runs $700 to $3,400 on a small bathroom, and it is the single best money in the job.

The same work discovered after the tiling is laid means starting again. Relevant detail sits under subfloor repairs and ventilation and floorboard repair and replacement. The practical consequence for a quote is a specific question worth asking every builder: have you looked under the floor. In a Melbourne house with a subfloor, somebody can get under there with a torch, and the ten minutes that takes is the difference between a firm price and a provisional one. Somebody who has not looked and quotes anyway has priced the bathroom on the assumption that everything below it is fine, which on a hundred-year-old cottage is an assumption rather than a finding.

Above the joists, the substrate has to be a sheet product rated for wet areas and fixed at the spacings the manufacturer specifies, then treated with the primer that manufacturer's membrane system requires. Compressed fibre cement sheet over timber is the usual answer and it costs $550 to $1,400 on a small bathroom including preparation. Using plasterboard in a shower enclosure, or skipping the primer, are both ways to produce a membrane that passes a visual inspection and fails within five years. Where a pre-1990 bathroom is being stripped, asbestos testing and inspection should happen before demolition begins, not once it is under way.

Apartments invert this problem. A concrete slab does not deflect and does not settle, so the substrate risk largely disappears, and what replaces it is access, owners corporation requirements and the cost of cutting concrete if anything has to move. Neither situation is better. They are different, and a quote that has not established which one it is dealing with is not a quote yet.

The Three Dollar Thresholds That Protect a Victorian Bathroom

Victoria sets its consumer protections at three separate dollar figures, all of them low enough that an ordinary small bathroom clears every one. This is the opposite of the situation in several other states, where a small bathroom is the renovation most likely to fall underneath the protective threshold and end up with nothing. Knowing precisely what each one does matters, because the paperwork is only useful if you keep it. The first sits at $750 and it applies to the plumbing. Where plumbing work exceeds $750 including materials, appliances, labour and GST, the licensed plumber must issue a compliance certificate, and certain work triggers the requirement regardless of value, including below-ground sanitary drain construction or alteration and anything involving gas appliances or consumer gas piping. The certificate must be issued within five days of the work being completed, or within five days of a plumbing contract being terminated, and lodged with the regulator inside the same five days.

That certificate matters more than its bureaucratic name suggests. Mandatory plumbing insurance runs from the moment the licensed plumber agreed to carry out the work until six years after the compliance certificate was issued, with minimum cover of $50,000 per claim or related series of claims on domestic plumbing, and $5,000,000 of public liability. The cover responds to defective work, incomplete work, consequential financial loss and non-completion where the plumber dies, becomes insolvent or has their licence suspended. On a small bathroom the plumbing carries a third of the technical risk, and in Victoria it is separately and specifically insured. Guidance is published by the Building and Plumbing Commission, which is now Victoria's regulator for both the building and plumbing industries.

The second threshold sits at $10,000. Work worth more than that generally requires a major domestic building contract under the Domestic Building Contracts Act 1995, a threshold lifted from $5,000 on 1 August 2017. A major domestic building contract is a defined instrument with content requirements attached, not a piece of paper somebody chooses to call a contract, and a builder must be registered to enter into one. Almost every small bathroom rebuild sits above $10,000, so a job proceeding on a quote and a handshake is not being done properly.

The third sits at $16,000. Above that figure the builder or tradesperson must take out domestic building insurance for the client. The policy covers up to $300,000 and responds where the builder cannot complete the work or rectify defects because of death, insolvency or disappearance, and for policies issued after 1 July 2015 it also responds to a failure to comply with a final order of the Victorian Civil and Administrative Tribunal or a court. One limitation is better known in advance than discovered later: a claim for work that was not completed may be limited to 20 per cent of the contract price. Detail on the scheme is published by Consumer Affairs Victoria. Underneath all three sit the implied warranties in the Domestic Building Contracts Act, which attach automatically and cannot be signed away.

The insurance responds for six years on structural defects and two years on non-structural ones, while the implied warranties themselves carry a longer tail and transfer to a subsequent owner. Defective waterproofing to a wet area is structural in character and sits in the longer period, which is the practical reason to photograph a membrane before it disappears. Two practical conclusions follow. First, ask for the compliance certificate instead of waiting to see whether it turns up, because plumbers are obliged to issue one and it is the only record tying your job to that cover. Second, ask to see the domestic building insurance certificate before paying a deposit on any job above $16,000, since the policy has to exist at that point and cannot be arranged afterward. Disputes that cannot be resolved are heard by VCAT.

Waterproofing Detail That Decides Whether a Bathroom Lasts

Waterproofing is the cheapest line in a bathroom that can cause the most expensive failure, and in a small bathroom it is proportionally the least avoidable. The requirements come from the National Construction Code, which for a house calls up the Housing Provisions and either AS 3740 or the equivalent detailed clauses, and the standard is maintained through Standards Australia with the Code itself administered by the Australian Building Codes Board. The geometry matters more in a small room than a large one. The shower floor must be waterproofed within a horizontal radius of 1500 millimetres from the shower connection, and a waterstop must sit at that radius. Where a shower is unenclosed over a freestanding bath, walls within that radius require waterproofing to at least 1800 millimetres.

In a bathroom 1.8 metres across, a 1500 millimetre radius from the shower rose reaches the opposite wall and the door threshold, so the practical answer is that the whole floor gets treated. That is why waterproofing does not get cheaper as the room gets smaller. Falls are prescribed, leaving nothing to judgement. The fall to the floor waste must sit between 1:80 and 1:50, which is a narrower window than it sounds when the total floor run is only 1.8 metres. Too shallow and water sits; too steep and the floor is uncomfortable and the tiles look wrong. Achieving that on a timber floor that has settled is screeding work, and it is the item most often compressed when a program is running late.

Bond breakers are the detail almost no home owner has heard of and the one that most often explains a failure. A bond breaker is installed at wall to wall, wall to floor and hob to wall junctions so that the membrane can move slightly at those junctions without tearing. Every one of those junctions is a place where two surfaces meet and move independently, and a membrane bonded rigidly across the corner has nowhere to go. A small bathroom has proportionally more junction length per square metre of floor than a large one, which is another reason the membrane work here is not a scaled-down version of a big job.

The trade itself is covered under waterproofing services. Application technique earns a paragraph of its own because it explains a specific failure mode. A membrane applied too thickly in a single coat cures faster at the surface than in the layers beneath, and the result is pinholing: microscopic holes that pass a glance and let water through for twenty years. The correct approach is multiple thinner coats with the manufacturer's stated curing interval between them, which is precisely the interval that gets compressed when everybody wants the tiler on site. Substrate moisture content matters for the same reason, since a damp substrate prevents proper curing.

What an owner can actually do about all this is short and effective. Ask which membrane system is being used, whether that is Mapei, Davco, Ardex or another range, and whether the substrate primer is the one that system specifies. Ask for the curing interval between coats and check that the tiler is not booked inside it. Photograph the finished membrane yourself, in daylight, with something in frame for scale, paying attention to the junctions and every penetration.

Then keep those photographs with the contract. If staining appears at the skirting in the fourth winter, those images are what let a plumber cut into one square metre of wall rather than four. Remediation, if it comes to that, is covered under shower regrouting and leak repairs.

Melbourne's Climate and What It Changes in a Small Bathroom

Melbourne has genuinely cold winters by Australian standards and long stretches of damp, still weather where nothing dries. That does two things to a bathroom. It turns heating into a functional requirement instead of a luxury, and it puts condensation ahead of shower splash as the dominant moisture problem. Both bear directly on how a small bathroom should be specified, and both are cheaper to get right at rough-in than to retrofit.

Condensation is the one owners underestimate. Warm wet air from a shower meets a cold wall or window surface and deposits water on it, and in a small room the air volume saturates within a couple of minutes so there is nowhere for that moisture to go but onto surfaces. Mould on the ceiling above a shower, or in the grout at the coldest corner of the room, is usually a condensation problem rather than a waterproofing one, which is why replacing the membrane does not fix it. Extraction does, and so does warming the surfaces. Extraction has to move air out of the building altogether instead of shifting it around inside. A fan discharging into a roof space relocates the moisture to the timber above the ceiling, which is a slower and more expensive failure than mould in the grout.

Ducting to an eave or a roof cowl on a short run with minimal bends is the correct arrangement, and it costs very little more at rough-in. Sizing matters as well, since a fan chosen for a bathroom twice the size will still struggle if the run is long and kinked, and the circuit is a job for a licensed electrical contractor rather than a handyman. Unit options are set out under bathroom heat lamp and fan installation.

Where the discharge route is the problem rather than the fan, roof ventilation covers the cowls and terminations that make a short duct run possible. Heating is where a small Melbourne bathroom gets an advantage over a large one. Electric underfloor heating is priced by area, so a three square metre room costs $380 to $820 to heat underfoot where a ten square metre room would cost three times that.

It warms the floor and the slab or screed above the membrane, which raises surface temperatures across the room and reduces the condensation load at the same time. On a cold Melbourne morning it is the single upgrade most owners say they would pay for again. Installation detail sits under underfloor heating installation. A heated towel rail does a related job for less money.

At $300 to $700 installed it dries towels in a room where towels otherwise stay damp for two days, and a damp towel is a meaningful part of the humidity load in a small bathroom. It needs its own circuit planned before the walls are sheeted, which is the only reason to settle it early. Many Melbourne homes with hydronic heating can run a hydronic rail off the existing loop instead, and where a house already has that system, ask the plumber whether the bathroom can be added to it. The window deserves a thought too.

A single-glazed aluminium-framed window in a Melbourne bathroom is the coldest surface in the room and therefore where condensation forms first and mould follows. Replacing it during the renovation, while the wall is open and the trades are already there, is dramatically cheaper than doing it afterward, and it removes the cause instead of treating the symptom. Where mould has already taken hold, bathroom mould removal and prevention deals with the remediation.

Owners Corporations and Apartment Bathrooms in Victoria

A large share of Victoria's smallest bathrooms are in apartments, and in this state the body governing the building is an owners corporation operating under the Owners Corporations Act 2006. A lot owner planning a bathroom renovation is dealing with two separate questions: what falls inside the lot and what belongs to the owners corporation, and what the rules of that particular scheme require before work starts. Common property generally extends to the structural elements of the building and to services running through a lot to serve other lots. In practice that means the slab, the structural walls, and the vertical stacks carrying waste and water between apartments. In many older schemes the original waterproofing membrane sits within that definition as well, which makes disturbing it a matter for the owners corporation rather than a decision the lot owner takes alone.

A builder quoting an apartment bathroom without having read the scheme rules is quoting a house bathroom in a unit. Approval conditions carry real cost. Schemes commonly restrict work to particular hours, require a lift booking and lift protection, specify insurance levels for contractors coming on site, and require water isolation to be coordinated so other apartments are not left without supply. Limit lift access to a three hour window and a strip-out that a house would absorb in a single day spreads over two or three, with the labour invoiced across all of them. Budget an additional $1,500 to $3,500 on a small apartment bathroom for these conditions, and about a week of extra program. Older Melbourne walk-ups bring a further consideration that should be raised before the job is priced.

Many two and three storey blocks from the 1960s and 1970s have a shared vertical stack serving bathrooms stacked directly above one another, and work on that stack is common property work by definition. A plumber who finds a degraded shared stack midway through a job is looking at an owners corporation matter, not a variation, and the sensible sequence is to have the stack inspected first. The strata and body corporate plumbing detail covers what shared services usually involve. There is one advantage available to lot owners that hardly anybody claims.

Somebody has almost certainly renovated a bathroom in your building already, and whoever did it learned the stack layout, the lift arrangements and exactly which certificates the manager insists on seeing. Put the question to the owners corporation manager. It costs a phone call and it routinely comes back with a name attached to both a keener price and a faster job. Disputes between a lot owner and an owners corporation that cannot be resolved internally are heard by VCAT.

Melbourne and Regional Victoria Cost Comparison

Victoria has a narrower internal price spread than most states, because the state is geographically compact and a large share of its population sits within two hours of Melbourne. A tradesperson servicing Ballarat or Geelong is not absorbing the travel and accommodation costs that shape pricing in northern Western Australia or far north Queensland. What varies instead is housing stock, trade availability and how much of the local market is competing for the same renovators.

The pattern across that table is driven by housing stock more than by geography. Inner Melbourne and the inner east carry a premium on account of the buildings being difficult rather than any shortage of trades, and a Fitzroy or Hawthorn bathroom may present a later rear addition on independent footings, a timber floor that has settled, and access only through a bedroom or down a side path too narrow for a wheelbarrow. Ballarat and Bendigo show the same effect at lower absolute rates, since goldfields era housing brings stumps and subfloor rectification into a large share of jobs. The growth corridors in the north and west sit at the bottom of the metropolitan range for the opposite reason. The stock is newer, frequently slab on ground with services in predictable positions, and there are enough renovators competing that a well-briefed job attracts genuinely comparable quotes.

Coastal areas invert this again: the Surf Coast, Torquay and the Mornington Peninsula carry holiday-home demand that competes for the same pool of trades, and the premium there reflects summer scarcity and nothing about the buildings themselves. Beyond about three hours from Melbourne the constraint becomes specialist supply and not labour rates. General trades exist in Mildura and East Gippsland and charge reasonably, but frameless glass, stone fabrication and less common tile ranges are ordered in and freighted, which lengthens the program without inflating the rate. The countermeasure is the same one that works everywhere and matters more here: have every fixture physically on site before the strip-out begins, because a small bathroom offers the trades nothing else to get on with while somebody waits for a delivery.

What to Look Out For When Getting Small Bathroom Quotes in Victoria

Ask three builders to price a small bathroom and the answers arrive further apart than on any other job in the house, because from a doorway the room looks like something you can eyeball. Estimated that way, a $17,000 job reaches $24,000 by the third week, and every dollar of that gap gets attributed to something a half hour with a torch and a tape would have turned up before anyone signed. The numbers that hold belong to the builder who counted the fittings, worked out the wall area, got under the floor, and committed to paper what happens if the timber around the waste comes up soft. Begin with the tiling quantity, since it is the largest single line and the easiest to understate.

Ask what square metre figure has been allowed for walls and what figure for floors. On a bathroom tiled to ceiling, a wall allowance under 18 square metres means either the tiling stops short or somebody measured the floor and forgot the third dimension. A tiling line quoted as a lump sum with no quantity attached cannot be compared against a competing quote at all. Ask whether anybody has actually crawled under there. On a Melbourne house with a subfloor, that single question separates a firm price from a hopeful one. Stump settlement, joist deflection and rot around an old waste are all visible with a torch and ten minutes, and all three change the price.

A builder who quotes a period home without looking has assumed the substrate is sound, and on a hundred-year-old cottage that is an assumption rather than a finding. Where rectification is called for, insist on a dollar figure instead of a line reading subject to inspection. Interrogate the waterproofing line specifically. Which membrane system, which primer, how many coats, what curing interval between them, and is the tiler booked outside that interval. Ask where the waterstop sits and confirm it sits at the 1500 millimetre radius the rules require and not at the edge of the shower base.

A suspiciously low waterproofing figure usually means somebody intends to squeeze it between other trades, which is legal in some circumstances and the leading cause of expensive failure in all of them. Confirm who does the plumbing and that a compliance certificate will be issued. Any plumbing work above $750 obliges the licensed plumber to issue one within five days and lodge it with the regulator, and that single page is what six years of cover on the hidden work hangs from. Where a builder cannot name the plumbing firm, the plumbing has been absorbed into a general labour figure, which is exactly where a price gets shaved without an owner noticing.

Check the contract and insurance against the quoted figure. Above $10,000 you should be signing a major domestic building contract instead of accepting a quote, and above $16,000 domestic building insurance must be in place and the certificate produced before you pay a deposit. Almost every small bathroom rebuild clears both figures, so a job proceeding informally is a job where the protections have quietly been left out. Every fitting wants its own number. A single bundled figure spanning tapware, shower set, pan and vanity conceals all four and hands the selection to whoever happens to be at the merchant on the day. Ask for model numbers, or for a per-item allowance you can price yourself at retail.

Nothing in a room this size is viewed from further than a metre, which is why a $180 mixer and a $420 one feel different at seven in the morning. Check the screen specification and the extraction separately, because both are frequently vague and both change the room. Framed, semi-frameless and frameless sit at very different prices and alter how a small bathroom reads more than any other item. A quote reading shower screen without naming the type has $900 of ambiguity in it, and the variants are set out under shower screen installation and repairs.

On extraction, ask where the fan discharges, since a unit venting into a roof space moves the problem instead of solving it. Ask about the program and what happens when it slips. A small bathroom is a two and a half to four week job in a Melbourne house and three to five weeks in an apartment, and the variable is rarely labour hours. The time goes on waiting. Membrane coats have to cure, the tiler has to be free again, and a fixture that showed as available when the quote was written has since gone on backorder. Any builder who writes the curing intervals and the trade gaps into a program has clearly done this more than once.

Three quotes is the working minimum and they have to be pricing the same scope for the comparison to mean anything. Put your brief on one page first: tile height, whether the waste moves, niche or none, extraction type and where it discharges, vanity width, screen type, door swing, heating. Every builder gets that identical page. Ask too about the items nobody raises, which in a small bathroom are a larger share of the total than on a big job: skip placement and any council permit, who protects the hallway between the front door and the bathroom, and who makes good the doorframe that gets damaged carrying a bath out. Ask for demolition and waste removal as a line of its own. Consumer guarantees sit over the top of all of it and cannot be excluded by a contract term: services must be delivered with due care and skill and must suit the purpose they were engaged for, guarantees administered nationally by the ACCC.

Practical Tips for Getting Small Bathroom Quotes in Victoria

Settle whether the waste moves before you contact anybody. Every other choice in a small bathroom is taste with a number beside it, but relocating a floor waste or a soil connection reorders the trades and accounts for most of the distance between the cheapest and dearest quote you will receive. On a timber floor a plumber can often work between joists, which is why the Victorian penalty for moving a waste is lower than it is in states built on slabs, but $3,000 to $6,200 is still real money. Get under the house yourself if you can do it safely, or ask the builder to.

A torch and a phone camera will tell you whether the stumps under the bathroom are sound, whether the joists look adequately spaced, and whether the timber around the existing waste is dark and soft. Knowing that before you collect quotes means you are pricing the real job and not the optimistic one. Work out the wall area yourself. Four times the floor figure gets you close enough for tiling to ceiling height, and that number is what a builder's allowance gets measured against when it lands. It answers the tile question at the same time: a favourite at $85 a square metre is either a $2,200 line or a $1,000 one, and you will want to know which before you fall further in love with it.

Book the quotes close together and be in the room for all of them. No two builders examine the same things, so anything the second one turns up deserves a call back to the first. Watch for whether they locate the meter box, establish where the existing fan actually discharges, measure the ceiling, and get under the floor. A builder covering that ground is thinking about your bathroom. One who is not is quoting a statistical average and hoping yours resembles it. In an apartment, get the owners corporation rules and the approval conditions before the quotes.

Work affecting common property is not the lot owner's decision alone, and approval conditions routinely dictate work hours, lift access, contractor insurance levels and water isolation. Each of those changes the price, and a builder quoting without them is pricing the wrong job. Ask for the domestic building insurance certificate before you pay a deposit on anything above $16,000, and ask for the plumbing compliance certificate at completion instead of hoping it arrives. The plumber is obliged to issue one within five days on any plumbing work above $750, and it is the document that carries six years of cover at $50,000 per claim on the part of the job you cannot see. Stage the payments against completed work. A schedule where the strip-out, the waterproofing, the tiling and the fit-off each release a payment keeps both parties wanting the same thing at the same time, and it means you are never far ahead of the work.

Resist a large payment up front on a job this size. Ask what the vanity top is going to be, because this is the one place engineered stone still catches people out. Since 1 July 2024 it has been unlawful anywhere in Australia to manufacture, supply, process or install engineered stone benchtops, panels and slabs, and the silica content does not come into it, enforced here by WorkSafe Victoria, so a fabricator offering one is offering something they cannot lawfully install. Outside the prohibition sit porcelain and sintered products below one per cent crystalline silica, along with natural stone, solid surface and timber, any of which does the job on a vanity this size.

Removing an existing engineered stone top remains permitted but is controlled work with dust obligations attached, so ask how the old one is coming out before the strip-out is booked. Material options are set out under bathroom vanity tops. Order every fixture early and store it yourself if you have the room. The commonest reason a three week bathroom becomes a six week bathroom is a backordered vanity or screen, and a room this size offers the trades no second front to work on in the meantime. Regional Victoria compounds it, because frameless glass and the less common tile ranges arrive by freight on somebody else's timetable. Check the vanity and basin installation pricing separately so you can judge whether the builder's allowance is generous or thin.

Decide the heating and the extraction before the first trade visit, not after. A three-in-one such as an IXL Tastic, a ducted inline fan from a supplier like Fantech and a plain ceiling fan are three different wiring jobs and three different ceiling penetrations. Underfloor heating, a heated towel rail circuit and the exhaust route all have to be set before the walls are sheeted and the ceiling patched, and reversing any of them afterward means opening finished work. In Melbourne these are not luxuries, and a small bathroom is cheap to heat precisely because it is small. Rail options sit under heated towel rail installation. Photograph the job before it disappears behind tile.

Membrane, pipe runs, cable routes, the waste and the fall running into it, and the junctions where the bond breakers should be. Shoot them yourself with a tape in frame so scale reads later. Keep a written record of every variation too, including the ones agreed in the doorway, because a run of $200 changes adds up to a final invoice nobody recognises and a text message confirming what was agreed is far easier to send than to reconstruct. Where a dispute cannot be resolved directly, the broader bathroom renovation cost guide for Victoria sets out the escalation path.