Why the Hydrothermal Specialist Should Be One of Your First Calls
- Don Genders
- 3 days ago
- 4 min read
One of the more common mistakes I see in spa and bathhouse development happens surprisingly early.
A developer has a vision. An architect starts shaping the building. An interior designer begins developing the look and feel. Spaces are allocated and floor plans start taking shape.
Then questions begin to arise about the pools and thermal experiences: What building services will they require? Where will the equipment go? What are the structural, mechanical, drainage and ventilation requirements? This is often the point at which the need for specialist hydrothermal engineering and design expertise becomes apparent — if the project team was even aware that such specialists existed.
By then, some of the most important decisions affecting the thermal areas may already have been made — how much space is available, where mechanical and technical equipment can be located, how people will move through the building, where drainage can go, what the ventilation strategy looks like and how the structure will accommodate pools and other water-based experiences.
Those decisions can all be revisited. But revisiting them later is usually harder and more expensive than getting them right in the first place.
Nobody wants to do work twice or make significant changes late in the design process to accommodate unforeseen equipment requirements, building services or unfamiliar code requirements.
Thermal spaces place unusual demands on a building
A sauna or steam room can look deceptively simple on an architectural plan. In reality, hydrothermal environments bring together heat, moisture, drainage, ventilation, waterproofing, electrical and mechanical systems in ways that very few other parts of a building do.
And every decision tends to affect another.
A pool is not simply a body of water that can be dropped into an available space. It needs filtration and water treatment, access for maintenance, drainage, structural consideration and plant space.
A steam room has to manage enormous amounts of moisture and condensation. A sauna has its own requirements around ventilation, materials, heat loads and safety. Even the position of doors, showers and cooling experiences has an impact on how successfully the overall environment works.
This becomes even more important in a commercial bathhouse, where hundreds of guests may move through the space in a day.
Start with how the bathhouse needs to work
Before deciding exactly how many saunas, steam rooms or cold pools a project should have, we need to understand how the business intends to operate.
How many guests will the facility accommodate at peak times?
How long will they stay?
Will there be timed admission?
Will the bathhouse offer guided sauna or steam rituals?
How many people might leave a large Aufguss session at exactly the same moment looking for a shower, cold experience and somewhere to sit?
These questions affect the design just as much as the dimensions of the rooms themselves.
You can design a beautiful 80-person event sauna, for example, but if there is only enough convenient cooling or relaxation space for a fraction of those guests when the session ends, you have created an operational problem.
The best thermal environments are designed around the entire bathing journey: heating, cooling, resting and then repeating the cycle.
The spaces between the experiences matter
Developers naturally focus on the headline features. They want to know how many saunas they can fit, whether they should include a cold plunge, what type of steam room they should build and which experiences will give the project its identity.
Those are important decisions.
But some of the least glamorous spaces can have just as much impact on whether the bathhouse works.
Where will guests cool down after heat?
Is there enough relaxation space?
Can maintenance teams access equipment without disrupting the guest experience?
Are showers and cold experiences positioned where people naturally need them?
Can the changing facilities cope with peak occupancy?
Where is the mechanical room going to go?
These are not details to solve once the design is finished. They are part of the design.
Good hydrothermal design should feel effortless
Guests should never have to think about any of this.
They should not notice the ventilation strategy or wonder where the filtration equipment is housed. They should simply feel that the temperatures are right, the rooms are comfortable and the journey from heat to cold to relaxation makes sense.
When that happens, there is usually a great deal of planning behind it.
The opposite is also true. A steam room that constantly drips condensation onto guests, a sauna that struggles to maintain temperature or a cold pool awkwardly positioned away from the natural bathing circuit may appear to be small problems once a facility is operating.
Very often, however, the roots of those problems go back to decisions made much earlier in the design process.
Bring specialist knowledge in before the expensive decisions are made
The role of a hydrothermal specialist should never be reduced to supplying a sauna or specifying a steam generator.
Our real value comes much earlier.
It is helping the wider design and development team understand how these environments work, what infrastructure they require and how the different elements need to come together before decisions become difficult or costly to change.
Architects and interior designers remain essential to creating an exceptional bathhouse. The strongest projects are collaborative ones, where architectural vision, guest experience, operational thinking and hydrothermal expertise inform one another from the beginning.
After more than three decades working on thermal environments, I have learned that it is much easier to solve a problem on a drawing than on a construction site.
If a bathhouse or hydrothermal spa is central to the project, involve the people who understand how it needs to work while there is still plenty of room to shape it.
Don Genders is Founder and CEO of Design for Leisure and a recognized expert in hydrothermal spa and wellness design. With more than 35 years of industry experience, he has helped shape award-winning wellness environments for leading hospitality, spa and wellness brands around the world.
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