A Perth bathroom renovation costs $12,000 to $45,000 depending on tier, with most owner-occupier projects landing between $22,000 and $35,000. Perth sits below Sydney and roughly level with Brisbane on labour rates.
What makes Perth bathrooms distinctive is the construction. In a double-brick home on a concrete slab, the waste pipes are cast into or run beneath the slab and the walls are solid masonry. That makes relocating fixtures genuinely expensive — considerably more so than in the timber-framed housing of Melbourne or Brisbane — and it makes the layout decision the single biggest cost lever in the project.
What You Get at Each Price Point
Budget — $12,000 to $18,000
Achievable, but something is giving. A small footprint, budget tapware and vanity, standard tiles laid part-height, a framed screen, and the existing layout retained exactly. Suitable for investment properties and pre-sale refreshes.
Be careful at the lower end. This is where corners get cut on what you cannot see — a single-coat membrane instead of the specified system, no screed falls to the waste, tiles over an unprepared substrate. If a Perth quote comes in under $13,000 for a full bathroom, ask specifically what waterproofing system is being used and who is applying it.
Mid-range — $22,000 to $35,000
Where most owner-occupier work lands. Full-height tiling, a semi-frameless or frameless screen, a quality wall-hung or freestanding vanity, mid-range tapware with a genuine warranty, a properly ducted exhaust fan, LED lighting, and a correctly applied membrane. Minor adjustments within the existing footprint are included.
High-end — $45,000 and above
Services relocated, a hobless walk-in shower with a linear drain, large-format tiles or stone on the walls, custom joinery, premium tapware specified at design stage, and frequently a reconfiguration that involves moving a wall — which in double brick is a structural exercise.
The Line-by-Line Breakdown
Where the money goes on a typical $28,000 Perth bathroom of about seven square metres:
- Demolition and disposal — $1,500 to $3,500. Masonry and tiled mortar beds generate significant tonnage, and disposal is priced by weight.
- Plumbing rough-in and fit-off — $3,000 to $7,000 with fixtures staying put; $6,000 to $12,000 where the slab must be cut and new falls established
- Electrical — $1,400 to $3,500, including IP-rated lighting, exhaust and any heated element. Chasing brick adds to this.
- Carpentry, framing and substrate — $1,200 to $3,500
- Waterproofing to AS 3740 — $1,100 to $2,800
- Screed and falls — $600 to $1,600
- Tiling, supply and lay — $5,500 to $13,000
- Fixtures and fittings — $3,500 to $11,000
- Plastering, rendering and making good — $1,500 to $3,500, higher than in framed construction because chased brick must be patched and re-rendered
- Project management and margin — typically 15 to 25 per cent
The Double Brick Reality
Moving fixtures is expensive here
This is the Perth-specific point that most affects the budget. In a slab-on-ground double-brick home:
- Waste pipes are in or under the slab. Relocating a toilet, shower or basin requires core drilling or saw-cutting the slab, establishing new falls, and reinstating. $4,000 to $9,000 for a meaningful relocation.
- Supply pipes must be chased into brick or run through the roof space and dropped down. Both are slower than working in a stud wall.
- There may be no set-down in the slab for a hobless shower, forcing either a raised floor across the room or a step at the entry.
- Wall-hung fixtures need proper backing. In masonry this means chemical anchors or a purpose-built frame rather than simply screwing to a stud.
The design implication: the cheapest good Perth bathroom keeps the toilet over its existing waste and the shower in its corner, and moves only the vanity. In a bathroom under seven square metres, that discipline is worth $5,000 to $9,000 — which buys a great deal of tapware and tile.
Where a wall must move
Enlarging a Perth bathroom by moving a wall is a structural question, because the internal leaf of a double-brick wall is frequently load-bearing. That means engineering, a lintel or beam, and a building permit. Budget $6,000 to $14,000 on top of the bathroom itself. See our guide to renovating a Perth double-brick home.
Waterproofing: The Line You Never Cut
Waterproofing failure is the most common serious defect in Australian residential construction. In a slab-on-ground masonry house the failure mode differs from timber-framed cities — the damage shows up as rising moisture in adjoining walls, damaged skirtings and flooring in neighbouring rooms, and salt damp in the masonry itself.
A compliant Perth bathroom membrane involves:
- The entire shower floor, and shower walls to at least 1,800mm within the enclosure
- The full bathroom floor where the room is above ground level or over a habitable space; on a ground-floor slab the requirement depends on the configuration, but full-floor treatment is good practice regardless
- Wall junctions and floor-wall junctions treated with bond breakers and reinforcing fabric
- Every penetration individually sealed — waste, tap bodies, screen fixings
- Correct falls to the waste, formed in the screed before the membrane
- Adequate curing between coats, applied in contrasting colours so coverage is verifiable
- A flood test before tiling where practical
One Perth-specific note: the dry climate means membranes cure quickly here, which is an advantage — but it also means an inexperienced applicator can apply the second coat before the first has properly cured through, particularly in summer when the surface skins over fast. Insist on the manufacturer’s stated cure times rather than a visual assessment.
Photograph the membrane comprehensively before tiling. See our guide to waterproofing and wet area compliance in Perth.
What Perth’s Housing Stock Adds
Asbestos
Perth homes built between roughly 1940 and 1990 frequently have asbestos cement sheeting in wet areas, eaves and fencing. Licensed removal starts around $2,500 for a small bathroom.
For more detail on this part of the project, see How Much Does a Small Bathroom Renovation Cost?.
Galvanised supply pipe
Pre-1970 Perth homes commonly have galvanised steel supply lines that have corroded internally, restricting flow. Replacement back to a serviceable connection point in a double-brick house is disruptive — $3,000 to $8,000 — and doing it while walls are already open costs a fraction of doing it later.
Salt damp
In older Perth homes, particularly those near the coast or where ground levels have risen against the walls, salt damp in masonry is a real issue. It presents as blown render, salt crystallisation and deteriorating brickwork at the base of walls. Renovating a bathroom without addressing an underlying damp problem means the new work deteriorates from behind. Investigate before you tile.
Concrete slab condition
Cutting into a slab reveals its condition and the state of any embedded services. On homes from the 1960s and 1970s, the plumbing under the slab may be at end of life, and discovering that mid-project is expensive. A CCTV drain survey costs $400 to $900 and is worth doing before you commit.
Set a 15 per cent contingency on any Perth bathroom, and 20 per cent where the house predates 1980 or where the slab is being cut.
Ventilation in a Dry Climate
Perth’s low humidity means mould pressure is lower here than in Brisbane or Sydney — but bathrooms still generate their own moisture, and an unventilated one will still develop problems.
Specify:
- An inline fan sized to the room, ducted with rigid or semi-rigid ducting and discharged to outside — never into the roof space
- A run-on timer
- An openable window where the layout allows
The one Perth-specific consideration: in a well-sealed modern home with ducted air conditioning, the bathroom exhaust can create pressure imbalances if there is no make-up air path. Ensure the door has an undercut or a transfer grille.
What Perth Bathrooms Do Not Need
Worth stating, because money spent here is money not spent elsewhere:
- Underfloor heating is a comfort item in Perth’s short mild winter, not a necessity
- Heated towel rails are pleasant but low priority
- Heavy-duty dehumidification is unnecessary in this climate
The money is better directed at the membrane, the ventilation, quality tapware, and — if the layout genuinely needs it — the structural work to move a wall.
Approvals, Licensing and Insurance
A like-for-like bathroom fitout that does not alter structure generally does not require a building permit in WA. You will need one where the work involves removing or altering a load-bearing wall — which in a double-brick home may include walls you assumed were partitions — or structural change to the slab.
Regardless of permit status:
- Plumbing must be done by a licensed plumber, who issues a compliance certificate
- Electrical work requires a licensed electrician and a certificate
- Home Indemnity Insurance is mandatory for residential building work valued over $20,000 — which captures most Perth bathroom renovations. The builder must provide the certificate before starting work or taking a deposit.
- Builder registration is required and can be verified through the state regulator
- Apartments require strata approval — see our guide to Perth apartment renovation
That $20,000 threshold catches a lot of bathroom work in Perth. Check the contract value and demand the certificate. Our guide to Perth approvals covers the framework.
For more detail on this part of the project, see How to Find and Vet a Renovation Builder in Perth.
Realistic Timelines
A Perth bathroom takes two to four weeks on site, with a longer calendar timeline:
- Days 1–3 — strip-out, disposal, inspection of the exposed substrate and any slab or wall condition issues
- Days 4–8 — any structural work, plumbing and electrical rough-in including chasing, substrate preparation
- Days 9–12 — screed and falls, waterproofing with curing time between coats
- Days 13–18 — tiling walls and floor, grouting after adhesive cure
- Days 19–23 — fit-off of tapware, toilet, vanity, screen, electrical
- Days 24–28 — painting, silicone, cleaning and defects
Add lead times for anything custom. A frameless screen is measured after tiling and takes two to three weeks. Imported tapware in a specified finish can take six weeks. Perth’s distance from eastern-state suppliers adds a week or two to many freight timelines, so order earlier than you would elsewhere — this is a genuine local consideration.
Getting the Quotes Right
Ask every Perth bathroom quote to state:
- The waterproofing system by brand and number of coats, and who applies it
- The tile allowance per square metre, and whether supply-only or supplied and laid
- Whether tiling is full height, and whether the ceiling is tiled
- Specific tapware and fixture models, not a lump-sum allowance
- Whether the shower screen is framed, semi-frameless or frameless
- The exhaust fan model and where it discharges
- Whether any wall is load-bearing and whether structural work is included
- Whether slab cutting is included, and at what rate if fixtures move
- The builder’s registration number and confirmation that Home Indemnity Insurance will be provided
- What happens if asbestos, salt damp or failed under-slab plumbing is discovered
The slab-cutting question is the one that separates builders who work regularly on Perth’s housing stock from those who do not. A good quote states a rate in advance so the conversation on day three is about extent rather than price.
For the wider budget picture, see our Perth renovation cost guide, and for choosing who does the work, our guide to vetting a Perth builder.
Small Bathrooms and Second Bathrooms
Perth’s 1960s to 1980s housing frequently has one small main bathroom and a separate toilet — a layout that no longer suits how households live. Combining them, or adding an ensuite, is one of the highest-returning changes available.
What works in a small Perth bathroom:
- Combining the bathroom and separate toilet into one room. The dividing wall is often non-structural, which makes this cheaper than most Perth wall removals — confirm with a builder first.
- A wall-hung vanity with visible floor beneath, which reads as larger
- A single tile format on floor and walls
- A frameless or single-panel screen rather than a framed enclosure
- A wall-faced or concealed-cistern toilet, saving 100 to 150mm of floor depth. In masonry, a concealed cistern needs a purpose-built frame rather than a stud cavity.
- A recessed shower niche, which must be framed or formed before lining
Adding an ensuite costs $16,000 to $32,000 where it can be built adjacent to existing services, and $28,000 to $50,000 where the slab must be cut for new drainage. In a Perth family suburb a second bathroom frequently returns two to four times its cost.
Fixtures That Justify Their Price
- Tapware cartridges. Cheap mixers fail at the cartridge, and replacing a wall-mounted mixer in a tiled masonry wall is a genuinely disruptive job. Buy tapware with an Australian warranty and available spare parts.
- The exhaust fan. An inline unit properly ducted outside, sized to the room, with a run-on timer.
- The shower screen hardware. In coastal suburbs specify the finish carefully — salt accelerates corrosion on hinges and fittings.
- The vanity carcass. Moisture-resistant board throughout.
- Wall-hung fixture backing. In masonry this means chemical anchors or a purpose-built frame. Getting it right the first time avoids opening a tiled wall later.
- The waste and trap. Accessible and serviceable rather than permanently tiled in.
Where restraint is sensible in Perth: underfloor heating and heated towel rails are comfort items in a short mild winter rather than necessities, and designer tiles above roughly $90 per square metre rarely read better than a well-laid $50 tile. The money is better directed at the membrane, the ventilation, and — if the layout genuinely needs it — the structural work.