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GUIDE 26 / COST DRIVERS
Bathroom Renovation Cost Melbourne
Two Melbourne bathrooms that look identical on a mood board can be separated by weeks of labour and a long list of materials. This guide sets out what actually moves the number — room size, layout changes, substrate condition, floor type, tile format, fixture tier, glazing and access — so you can read a quote as a scope of work rather than a headline figure. No prices are published here, because a figure written without seeing your bathroom is a guess.
01 / A BATHROOM IS NOT ONE TRADE
Where the money actually goes
A bathroom renovation is a sequence: demolition and waste removal, carpentry, plumbing rough-in, electrical, waterproofing, screeding, tiling, glazing, cabinetry, fit-off and making good. Each stage carries its own labour, and each one waits on the stage before it. Cost follows two questions: how much of that sequence your bathroom needs, and how difficult each step is inside your particular building.
That is why square-metre rules of thumb travel so badly across Melbourne. A ground-floor bathroom on a sound slab where nothing moves is a different job to a first-floor wet area over a living room where the shower and toilet swap walls. Same drawings, same finishes photo — different trade days, different risk. If you want the local version of this, read what drives bathroom renovation cost in Malvern.
02 / SELECTION LEDGER
Eight things that decide your number
Read these as entries, not as a menu. Most quotes differ because two or three of these rows differ.
01 — ROOM SIZE AND TILED AREA
Tiling is measured in square metres of floor and wall. Full-height tiling to three walls can more than double the tiled area of a bathroom with a half-height feature wall.
Tiling is measured in square metres of floor and wall. Full-height tiling to three walls can more than double the tiled area of a bathroom with a half-height feature wall.
02 — MOVING PLUMBING POSITIONS
Keeping the pan, basin and shower where they are is the single largest saver. Relocating a toilet means new drainage falls, opening the floor and often the ceiling below.
Keeping the pan, basin and shower where they are is the single largest saver. Relocating a toilet means new drainage falls, opening the floor and often the ceiling below.
03 — FLOOR WASTE RELOCATION
Hobless and walk-in showers need the floor re-set to fall. On a suspended timber floor that becomes joist and sheeting work before a tile is cut.
Hobless and walk-in showers need the floor re-set to fall. On a suspended timber floor that becomes joist and sheeting work before a tile is cut.
04 — SUBSTRATE CONDITION
What the old tiles were hiding: soft framing, a failed membrane, patched waterproofing or an out-of-level slab. This is discovered at strip-out, not at quoting stage.
What the old tiles were hiding: soft framing, a failed membrane, patched waterproofing or an out-of-level slab. This is discovered at strip-out, not at quoting stage.
05 — TIMBER VERSUS CONCRETE FLOORS
Timber floors move, so they need sheeting, screwing off and a membrane system rated for movement. Slabs are steadier but harder to chase for new drainage.
Timber floors move, so they need sheeting, screwing off and a membrane system rated for movement. Slabs are steadier but harder to chase for new drainage.
06 — TILE FORMAT AND STONE
Large-format porcelain, mosaics, herringbone sets and natural stone each carry different setting, cutting and waste allowances. See the materials guide.
Large-format porcelain, mosaics, herringbone sets and natural stone each carry different setting, cutting and waste allowances. See the materials guide.
07 — FIXTURES, TAPWARE AND GLAZING
Mixer and outlet tier, in-wall cisterns, semi-frameless versus frameless screens, and glass cut to a raked ceiling all sit in very different bands.
Mixer and outlet tier, in-wall cisterns, semi-frameless versus frameless screens, and glass cut to a raked ceiling all sit in very different bands.
08 — JOINERY AND ACCESS
Custom vanity cabinetry versus a stock unit; then access — lift bookings in an apartment, a narrow terrace hallway, or rear-lane-only delivery and bin placement.
Custom vanity cabinetry versus a stock unit; then access — lift bookings in an apartment, a narrow terrace hallway, or rear-lane-only delivery and bin placement.
Strip-out reference: workers remove material from an interior. Illustrative stock photography, not a completed local project.
03 / THE HONEST UNKNOWN
Why two identical-looking bathrooms quote differently
Bathroom A: fixtures stay in position, sound concrete slab, 600×600 porcelain floor, half-height wall tiling, semi-frameless screen, stock vanity, ground floor with side access.
Bathroom B: shower and toilet change walls, suspended timber floor above a living room, hobless shower with a re-set floor waste, full-height large-format tiling with mitred external corners, custom joinery to a non-standard opening, first floor of a period terrace with no rear access.
Both can be drawn as the same bathroom and photographed to look the same. They are not the same job. A full bathroom renovation is priced on the sequence underneath the finishes, which is why a measured site inspection produces a more reliable scope than a phone estimate.
04 / COMPARING QUOTES
What a comparable quote should itemise
Line up the scope lines before you compare totals:
— Demolition, rubbish removal and site protection
— Waterproofing scope and which surfaces are membraned
— Tiling area in square metres, format and set-out pattern
— Plumbing: what stays, what moves, rough-in and fit-off
— Electrical: lighting, exhaust, heating and circuits
— Who supplies tiles, stone, tapware and fixtures
— Screens, mirrors and cabinetry sizes and finishes
— Making good: cornice, paint, door, architrave, floor junction
— Stage sequence and expected site days
— How variations are priced and approved
— Demolition, rubbish removal and site protection
— Waterproofing scope and which surfaces are membraned
— Tiling area in square metres, format and set-out pattern
— Plumbing: what stays, what moves, rough-in and fit-off
— Electrical: lighting, exhaust, heating and circuits
— Who supplies tiles, stone, tapware and fixtures
— Screens, mirrors and cabinetry sizes and finishes
— Making good: cornice, paint, door, architrave, floor junction
— Stage sequence and expected site days
— How variations are priced and approved
Variations, and where they come from
A variation is a written change to agreed scope. Most arise from one of two places: something concealed is discovered at strip-out — soft framing, an old membrane, a service in an unexpected position — or a selection changes after the quote was written, such as moving from a stock vanity to custom joinery, or from a 600mm tile to a mosaic set.
Ask how variations are documented and approved before work continues. A quote built from assumptions rather than a site inspection tends to generate more of them. Locking selections early — the discipline behind our twelve-stage process and the pre-demolition checklist — is the most practical way to keep scope steady.
05 / QUESTIONS
Bathroom renovation cost questions
Why won't a renovator give a price over the phone?
Because the two biggest cost drivers — whether plumbing positions move and what condition the substrate is in — cannot be assessed without measuring the room and looking at the floor structure and access.
Does a small bathroom cost proportionally less?
Not in proportion. Every trade still attends, waterproofing is still a full system, and the same fixtures are installed. Tight rooms can also slow tiling and joinery. See small bathroom renovations and small bathroom layout ideas.
Is it cheaper to keep the existing layout?
Generally yes. Reusing drainage points avoids cutting floors, re-setting falls and opening ceilings below. A layout change can still be the right decision — it just needs to be a decision made at design stage, not mid-build.
What causes the biggest surprises?
What sits behind the old tiles. Long-term shower leaks can affect framing, sheeting and the floor beyond the wet area. Our waterproofing guide explains how those failures usually start.
How long should I allow, and does time affect cost?
Trade days and curing periods are part of the price. Waiting on a back-ordered tile or a custom top can idle a site. The stage-by-stage timeline shows where delays typically appear.
06 / NEXT ACTION
Get a scope-based quote for your bathroom
Send through your suburb, bathroom type, rough budget band, timeframe and a short description of the room. The enquiry form asks for your name, email, phone, suburb, renovation type, budget, timeframe and project details, and submissions are stored privately in this website. We use it to arrange a site visit and prepare an itemised scope.