Stone & Steam designs and builds bespoke steam rooms for homes across Wollongong, Illawarra, and greater NSW. Every project is engineered for performance, crafted for longevity, and designed to feel like a personal sanctuary.
Most people think of a steam room as a luxury add-on — something that rounds out a high-end renovation. That framing undersells what a well-engineered steam environment actually does to a home and a life.
Steam has been central to human ritual bathing — Japanese onsen, Finnish sauna culture, Roman thermae — for centuries, for good reason. Sustained heat and humidity do things that a shower cannot: they open the body at a cellular level, slow the nervous system, and create a quality of daily restoration that compounds over time.
A properly designed steam room isn't an indulgence. It's an infrastructure decision — the most-used room in a home that takes wellbeing seriously. The clients who commission Stone & Steam steam rooms don't treat them as occasional features. They use them daily.
Every steam room we build follows the same obsessive process — because shortcutting any stage creates a steam room that performs poorly, degrades quickly, or simply doesn't feel right. There are no phases we skip.
We start with a conversation about how you live, how you want to use the space, and what "sanctuary" means to you. We assess the site — existing plumbing, electrical capacity, ceiling height, waterproofing conditions — and begin forming a design brief. This stage protects you from committing to a scope that doesn't suit the space or your life.
We design the steam room as architecture — ceiling pitch for condensate management, bench positioning for heat stratification, door placement for vapour containment. Every dimension is deliberate. The design is resolved before any demolition begins.
Stone, tile, and substrate selection happens collaboratively. We source materials that perform at 100% humidity — natural stone, large-format porcelain, and mineral-based finishes that handle thermal cycling without cracking, staining, or degrading. No off-the-shelf kits. No shortcuts.
The substrate is where most steam rooms fail. We engineer the waterproofing system for total vapour impermeability — membrane selection, penetration sealing, and drain specification are all specified to Australia's AS 3740 standard and beyond. The tile and stone are the last layer of a correctly built envelope, not the first line of defence.
Installation is executed by Patrick and his team — the same people who designed it. Tile and stone setting, generator installation, lighting, controls, and bench construction are all finished to the same standard. The build is inspected at every stage before the next begins.
We test the steam environment before handover — generator performance, temperature calibration, vapour distribution, and control response. You receive a full usage brief and a commissioning record. The steam room is handed over performing exactly as designed.
Japanese bathhouse and onsen culture maintains the most exacting standards for steam environments anywhere in the world. We use these benchmarks — not Australian minimums — to specify every element of a Stone & Steam steam room.
Steam generators are sized to the exact cubic volume of the room — not estimated by room area. Under-specification produces disappointing temperature gradients; over-specification creates an uncontrollable environment and wastes energy. We calculate output for each space individually.
A steam room operates at near 100% relative humidity continuously. The waterproofing membrane is specified for continuous vapour exposure — not just splash protection. Every penetration, corner, and drain is sealed to the same standard. No gaps, no compromises.
A well-engineered steam room reaches an even temperature across seating positions. Ceiling pitch, steam inlet placement, and bench height are all coordinated to minimise hot and cold zones. You should be able to sit at any position and experience the room as designed.
A steam room heats and cools multiple times per week — sometimes daily. Every material we specify is selected for this thermal cycling, including tile adhesives, grouts, and sealants. Materials that look beautiful initially but fail under repetitive heat stress are not on our palette.
Not every beautiful material belongs in a steam room. At 100% humidity and elevated temperatures, the wrong choice degrades, stains, or simply fails. We specify only materials we can stand behind for the life of the room.
Certain granites, marbles, and travertines perform well in steam environments. Others absorb moisture, stain, or spall under thermal cycling. We specify stone by grade and finish — honed over polished, sealed correctly, and suited to the specific humidity and temperature profile of the room.
Rectified porcelain offers near-zero water absorption, dimensional stability under heat, and a surface that remains hygienic in a humid environment. We source from select manufacturers and avoid domestic-grade stock.
Membrane selection for a steam room differs from a standard bathroom. We use systems rated for continuous immersion and vapour exposure — not standard tanking membranes applied in steam environments as a cost shortcut.
We specify commercial-grade generators — not residential packaged units — sized by kW output to the room's cubic volume and insulation specification. Controls are intuitive and built for daily use over years, not promotional pamphlets.
We don't publish flat-rate pricing, and we won't. A steam room built to last 30 years is not a product with a sticker price — it's a design-and-build engagement where the scope, materials, and site conditions define the number. What we can do is tell you what drives the cost.
Stone & Steam works at the premium end. Our clients are not looking for the cheapest steam room in the Illawarra — they're looking for one that performs flawlessly, ages gracefully, and feels like it belongs in their home. If that's your priority, we should talk.
The design consultation is the right first step. We scope the project, give you an honest investment range, and let you decide — with full information.
Book a Free ConsultationThe cubic volume of the space determines generator sizing and the quantity of materials required. Larger rooms require more powerful generators and longer installation time.
Retrofitting a steam room into an existing home involves more demolition, waterproofing remediation, and infrastructure work than a new-build inclusion. Site conditions matter significantly.
Natural stone, premium porcelain, and commercial-grade waterproofing systems cost more than standard bathroom materials. The premium reflects performance and longevity.
Commercial-grade steam generators and quality control systems represent a meaningful portion of the build cost — and the difference in daily experience and long-term reliability is significant.
Steam generators require a dedicated cold-water feed and a circuit typically between 15–32A. If this infrastructure doesn't exist, it forms part of the project scope.
In most cases, yes — but the feasibility assessment matters. Here's what we evaluate when a client comes to us with an existing space they want to convert.
Ceiling height. A minimum of 2.2 metres is preferred for comfortable steam distribution. Low ceilings create environments where the heat becomes oppressive rather than restorative — we assess this at the design stage.
Waterproofing condition. An existing bathroom may have waterproofing that isn't suited to continuous steam exposure. We assess the existing substrate and membrane before committing to a scope — remediation is common and is factored into the estimate.
Plumbing access. The steam generator requires a cold-water feed. In most homes this can be run during the renovation; the complexity depends on the distance from the existing water supply.
Electrical capacity. A 15–32A dedicated circuit is typically required depending on generator specification. We work with your electrician or coordinate this as part of the project.
Structural framing. Steam rooms benefit from framing that can support a fully tiled, heavy stone environment. We assess existing framing as part of the site inspection.
Ventilation management. Steam environments require controlled ventilation — not shared exhaust pathways with standard bathroom fans. We design ventilation to match the steam output without over-cooling the room during use.
Every project is different — different spaces, different briefs, different material palettes. What doesn't change is the standard of engineering and the quality of finish.
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Each project photographed on completion. More added as builds are delivered.
View all projectsThe questions we hear most often — answered plainly, without hedging.
A free, no-obligation conversation with Patrick Woodley. We'll discuss your space, your brief, and what a properly engineered steam room would involve. No pressure — just clarity.
Patrick responds personally — usually within 24 hours on business days.