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Designing a hydrothermal spa is about far more than choosing beautiful finishes and impressive facilities. When it is done well, the result feels effortless, calm and intuitive. When it is done without specialist knowledge, even the most luxurious space can become compromised, costly and difficult to operate. This is where experienced hydrothermal experts make all the difference.

One of the most common issues we see is what happens when specialists are brought in too late. Without expert input during the early design stages, projects can face expensive delays and re-fits that could easily have been avoided. Early planning allows the spa to be designed holistically, ensuring the layout, infrastructure and guest experience all work seamlessly together from the start.

Space planning is another area that is frequently underestimated. Hydrothermal environments require more than just the visible guest areas. Plant rooms, mechanical equipment and back-of-house spaces are essential to the smooth running of the spa, yet they are often overlooked or squeezed into inadequate areas. Without sufficient space, maintenance becomes difficult, noise increases and operational efficiency suffers.

The flow of people through a spa is equally important. A well-designed hydrothermal journey should feel intuitive for guests, while also allowing staff to move easily and discreetly through the space. Cleaning and maintenance need to happen without disrupting the calm atmosphere, and this can only be achieved when people flow has been carefully considered from the outset.

Understanding your audience is another critical factor. Cultural differences, expectations and preferences all influence how a spa is used. A facility that works beautifully for one market may feel disconnected in another if these nuances are ignored. Knowing which treatments and experiences guests will genuinely value ensures the spa is not only well designed, but also well used.

Noise is often an unseen disruptor of relaxation. Whether it comes from a hydrotherapy pool, plant equipment or poorly isolated mechanical areas, excessive noise can quickly undermine the sense of tranquillity. Experienced specialists know how to design and engineer spaces where sound is controlled and calm is preserved.

Back-of-house areas are rarely glamorous, but they are vital. Without adequate space for storage, staff facilities and operational functions, the day-to-day running of the spa becomes inefficient and stressful. These hidden areas support the guest experience and should be given just as much consideration as the spaces guests see.

Material selection is another area where expertise matters. Hydrothermal environments place intense demands on surfaces and structures due to constant heat and moisture. Using substandard materials or poorly tested waterproofing systems can lead to long-term damage, safety issues and costly repairs. Proper drainage, ventilation and certified construction materials are non-negotiable in these environments.

Health, safety and hygiene must underpin every design decision. From slip resistance and air quality to accessibility and regulatory compliance, these considerations protect both guests and operators. Overlooking them can lead to serious consequences and a compromised reputation.

Attempts to reduce costs by excluding specialist consultants often have the opposite effect. Skipping dedicated expertise such as MEP consultants or structural engineers typically results in inefficiencies, redesigns and higher costs further down the line. Investing in the right expertise from the beginning ensures the project runs smoothly and performs as intended.

Finally, a successful hydrothermal spa should be designed with revenue in mind. Thoughtful planning can maximise usage, encourage repeat visits and support premium experiences that guests are willing to pay for. When design, operation and guest experience are aligned, the spa becomes not just a feature, but a valuable asset.

At ASPA, we believe great wellness spaces are built on knowledge, experience and careful planning. By involving hydrothermal experts from the earliest stages, you avoid costly mistakes and create spa environments that are efficient, sustainable and truly restorative.