Ensuite Cost Calculator
Ensuites are small, which makes them cost more per square metre than a main bathroom, not less. This estimates a compact ensuite specifically, covering whether you are refreshing an existing one or carving a new one out of a bedroom or robe.
Waterproofing must comply with AS 3740 and it is not a DIY item. The standard sets minimum wetted heights, requiring the shower walls waterproofed to at least 1,800mm, the entire shower floor and 1,500mm up the adjacent walls at the hob or step down, and 150mm up the walls elsewhere in the room. In most states the membrane must be installed by a licensed waterproofer and comes with its own certificate and warranty, and a failed membrane means demolishing the finished room to fix it. This is the one line item never to shop on price.
Small wet areas cost more per square metre than large ones because the fixed costs do not shrink. You still need a waterproofer, a plumber, an electrician, a tiler and a shower screen regardless of whether the room is 3m² or 8m², so a compact ensuite often lands at $2,500 to $4,500 per square metre where a main bathroom sits nearer $1,800 to $3,000.
Order the shower screen after the tiling is finished, not before. Screens are made to the measured opening, and ordering off plan almost always results in a packer strip or a gap, because tiled walls are never perfectly plumb.
💰 Ways to save
- Keep every fixture where it is. The single biggest saving available in a small ensuite is not changing the plumbing layout, which typically saves $2,000 to $5,000 against a full relocation. A new vanity, new tapware, new tiles and a new screen in the existing positions transforms the room visually, and nobody who uses it will know or care that the toilet is where it always was. Spend the saved money on the finishes people actually touch and see.
- Tile the wet walls fully and paint the dry ones. A common and very effective compromise in a compact ensuite is full height tiling in the shower enclosure and behind the vanity, with a good quality bathroom grade paint on the remaining walls above a tiled skirting. That can cut the tiling bill by 30 to 40 percent, and in a room this small the visual difference is minimal because most wall area is either shower, vanity or door.
- Choose a larger format tile to cut labour, not just material. Tiling labour is the dominant cost in a small wet area and it is driven by the number of tiles laid and the metres of grout line, so a 600 by 600 floor tile is meaningfully cheaper to lay than a mosaic or a small format subway, even at a higher price per square metre. Save the expensive detailed tile for the shower niche or a single feature strip where the quantity is tiny.
- Bundle the ensuite with any other wet area work in the house. Trades charge for mobilisation, and getting the plumber, waterproofer, tiler and electrician back a second time for a laundry or main bathroom six months later costs each of them a fresh set up. Doing an ensuite and a laundry together typically saves 10 to 15 percent across the combined job compared with running them as two separate projects.
or from $23/week over 5 years , indicative finance
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## What a small ensuite costs in 2026
Pricing reviewed: June 2026.
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Pricing reviewed June 2026. Indicative Australian costs, not a quote.
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Understanding ensuite costs in Australia
What a small ensuite costs in 2026
An ensuite is a different budget problem from a main bathroom, because the room is small and the fixed costs are not. In 2026 a cosmetic refresh of an existing ensuite, meaning new tapware, a new vanity, a new toilet suite, a new screen and paint while retaining the existing tiles and waterproofing, runs $4,500 to $9,000. A full strip out and rebuild in the same footprint, which is the most common job, lands at $12,000 to $22,000 for a compact 3m² to 5m² room at a mid range finish. Creating a brand new ensuite by carving space out of a bedroom or a walk in robe is $18,000 to $35,000, because you are adding framing, a door, new drainage, new electrical and mechanical ventilation on top of everything a rebuild involves. High end finishes with stone, feature tile and premium tapware push a compact ensuite to $30,000 or beyond.
Why small wet areas cost more per square metre
People are consistently surprised that a 4m² ensuite does not cost half of an 8m² bathroom. The reason is that almost every cost in a wet area is a fixed trade attendance rather than a variable quantity. You need a plumber for rough in and fit off regardless of room size. You need a licensed waterproofer, and the certificate costs much the same for a small room as a large one. You need an electrician for lighting, the exhaust fan and any heated element. You need a tiler, and a shower screen, and a vanity, and a toilet. The consequence is that a compact ensuite commonly works out at $2,500 to $4,500 per square metre where a main bathroom sits closer to $1,800 to $3,000. Understanding this stops you from chasing a per square metre benchmark that does not apply to the room you are actually building.
Waterproofing to AS 3740 is the non negotiable line
Waterproofing is the item that determines whether the ensuite is a twenty year room or a two year disaster, and it is governed by AS 3740, the Australian standard for waterproofing domestic wet areas. The standard sets minimum wetted heights that a compliant job must achieve: the shower walls waterproofed to at least 1,800mm above the floor, the whole shower floor plus 1,500mm up the walls at any hob or step down, 150mm up the walls elsewhere in the room, and the full floor waterproofed where the room is above ground level or over a timber floor. In most states the membrane must be applied by a licensed waterproofer who issues a certificate and a warranty, and the work must be inspected before tiling covers it. A membrane failure is the worst outcome in a bathroom renovation because the only fix is demolishing the finished room, so if there is one line where you accept the higher quote and check the licence, this is it.
Layout, plumbing moves and slab versus timber floor
The largest controllable variable after finish level is whether you move the fixtures. Leaving the toilet, shower and basin in their existing positions keeps the plumber's work to a straightforward rough in and fit off. Moving the basin is generally cheap because it is a small waste and easy to re route. Moving the shower is moderate. Moving the toilet is the expensive one, because the pan connector needs a minimum fall to reach the sewer stack, and where your ensuite sits on a concrete slab that means core drilling and chasing the slab, commonly $1,500 to $4,000 before any plumbing. On a suspended timber floor the same move is far simpler because the drainage runs in the floor cavity. Find out which construction you have before you start drawing new layouts, because it changes the economics of the whole design.
Ventilation, electrical and the compliance items people forget
A wet area needs either an openable window or mechanical extraction, and in an internal ensuite that means an exhaust fan ducted to outside rather than into the roof cavity. Venting into the roof space is a common shortcut that dumps moisture straight into the insulation and causes mould and rusting fixings within a couple of years, and it does not comply. A properly ducted fan with a roof or eave cowl is $500 to $900 installed. Electrical work in a wet area follows strict zone rules governing what fitting can sit where relative to the shower, all circuits must be RCD protected, and any heated towel rail or underfloor heating needs its own dedicated circuit. All of it is licensed work and must come with a certificate of compliance. Budget $1,200 to $2,500 for the electrical package in a typical ensuite rebuild.
Where the money goes in a typical ensuite
On a $16,000 compact ensuite rebuild, a representative split is roughly $2,000 to $3,000 for demolition and rubbish removal, $2,500 to $3,500 for plumbing rough in and fit off, $900 to $1,600 for waterproofing, $3,500 to $5,000 for tiling labour and materials, $1,200 to $2,500 for electrical and ventilation, $1,500 to $3,000 for fixtures being the vanity, toilet suite and tapware, and $900 to $1,800 for the shower screen and mirror. Labour is around 55 to 65 percent of the total, which is why decisions that reduce labour hours, such as larger format tiles and not moving plumbing, save more than decisions that reduce material cost. Allow a 10 percent contingency on top, because opening up an old wet area regularly reveals rotted framing, an undersized waste or previously undisclosed water damage.
Timelines and living through it
A compact ensuite rebuild is typically a three to four week job on site, and that assumes trades run in sequence with no waiting. The sequence is demolition, then plumbing and electrical rough in, then wall and floor preparation, then waterproofing with its mandatory cure time of usually 24 to 48 hours between coats, then tiling, then grouting and cure, then fit off of fixtures, then the shower screen which is measured only after tiling is complete. The two points that most often blow the schedule are waterproofing cure time, which cannot be rushed without compromising the membrane, and the shower screen, which is made to order after measurement and commonly takes 10 to 15 working days. Order long lead items such as tiles, tapware and the vanity before demolition starts, because a stalled site with trades booked elsewhere is how a four week job becomes a ten week one.
Frequently asked questions
How much does an ensuite cost in Australia in 2026?
A cosmetic refresh keeping the existing tiles is $4,500 to $9,000. A full strip out and rebuild of a compact 3m² to 5m² ensuite at a mid range finish is $12,000 to $22,000. Adding a brand new ensuite by taking space from a bedroom or robe runs $18,000 to $35,000, and a high end compact ensuite with stone and premium tapware can pass $30,000.
Why does a small ensuite cost more per square metre than a bathroom?
Because almost every cost is a fixed trade attendance rather than a variable quantity. You need a plumber, a licensed waterproofer, an electrician, a tiler, a screen, a vanity and a toilet whether the room is 3m² or 8m². That pushes a compact ensuite to roughly $2,500 to $4,500 per square metre where a main bathroom sits nearer $1,800 to $3,000.
What does AS 3740 require for ensuite waterproofing?
It sets minimum wetted heights, requiring shower walls waterproofed to at least 1,800mm, the full shower floor plus 1,500mm up the walls at any hob or step down, and 150mm up the walls elsewhere in the room. In most states a licensed waterproofer must apply the membrane and issue a certificate, and the work is inspected before tiling. A failed membrane can only be fixed by demolishing the finished room.
How much does it cost to move the toilet in an ensuite?
It depends entirely on your floor. On a suspended timber floor the drainage runs in the cavity and the move is relatively simple. On a concrete slab the pan connector needs a minimum fall to the sewer, which means core drilling and chasing the slab, commonly $1,500 to $4,000 before the plumbing work itself. Moving the basin is much cheaper than moving the toilet.
Do I need council approval to add a new ensuite?
Usually yes, because you are adding a wet area, altering internal layout and changing the drainage, which most councils treat as building work requiring approval. You will also need to demonstrate that the bedroom you took space from still meets minimum room size and light and ventilation requirements, and that the new ensuite has compliant mechanical ventilation or an openable window.
How long does an ensuite renovation take?
Around three to four weeks on site for a compact rebuild if trades run in sequence. The two items that most often extend it are waterproofing cure time, which is typically 24 to 48 hours between coats and cannot be rushed, and the shower screen, which is measured only after tiling is finished and then takes 10 to 15 working days to make. Order tiles, tapware and the vanity before demolition starts.
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