“Add a sauna and a jacuzzi” sounds like a finished decision. In practice, this is where most projects go wrong — not because the idea is bad, but because wellness is understood as equipment, not as an experience the guest comes to live through.
A guest looking for wellness in a holiday home already has a ritual they practise at home — sauna, cold plunge, quiet. When choosing where to stay, they are not asking “does it have a sauna”, but “can I do here what I normally do”. The difference between those two is the difference between a property that gets booked and a property that is remembered.
This guide does not sell equipment. It walks through six decisions — from the guest, through the build, to the business effect — in the order in which they are actually made.
Step 01Who is the guest looking for wellness
Before deciding what to build, it is worth understanding who is looking for it. Because that profile explains why wellness changes the economics of the property, not just the listing.
The guest comes from markets where wellness is part of everyday life, not a luxury. The main foreign markets for continental Croatia are Germany, Austria, Slovenia, Poland and Czechia (HTZ/eVisitor, 2024–2025). This is not accidentally relevant: Austrians are global leaders in wellness spending per capita — wellness accounts for around 9% of Austrian GDP (Global Wellness Institute, 2024), while Germany has more than 2,000 public sauna facilities and around 1.7 million households with a private sauna (Deutscher Sauna-Bund, 2024).
For that type of guest, a sauna is not an attraction — it is something they also use at home. When they travel, they look for a property that allows them to do that. When they find it, that property goes to the top of the list, and price moves lower on the priority list.
That guest spends more and chooses by substance. Wellness tourists account for around 8% of trips, but close to 18% of tourism spending — roughly 2.3× more than the average guest (GWI Global Wellness Economy Monitor, 2025).
Continental Croatia is now moving into that market. In 2024, Krapina-Zagorje County recorded more foreign than domestic arrivals for the first time and exceeded 400,000 overnight stays, with further growth in 2025 (TZ KZŽ / HTZ eVisitor). This is a structural shift toward exactly the type of clientele looking for premium content.
Step 02What is real wellness, and what is imitation
This is where the decision most often breaks. A guest who practises wellness every day recognises the difference within the first five minutes — and that difference determines whether they return and how they review the stay.
What the guest recognises as “not it”
An inflatable bubble pool presented as a “jacuzzi”. A small prefabricated cabin bought as an off-the-shelf product, presented as a “sauna” — without proper insulation, without mode control, with a heater that cannot maintain stable sauna climate.
If a guest pays for a property labelled “wellness”, they do not expect the cheapest version. A mismatch between promise and reality is worse than having no wellness at all — because it creates a negative review from exactly the guest whose opinion is most valuable.
What makes real wellness
A sauna with properly executed climate and modes. Finnish, infrared and BIO mode are not marketing labels — they are different experiences for different guests and occasions. (In detail: Combining sauna modes.)
Proper execution, not an off-the-shelf catalogue product. An outdoor sauna has to withstand moisture, snow, UV and temperature shock, while still maintaining stable sauna climate — that is a matter of construction, insulation and materials, not a box.
A complete ritual, not a single object. A sauna without cooling and a place to rest is incomplete. The flow hot → cold → rest is what the guest comes to experience.
There is also a measurable signal: in an academic analysis of rental listings, attributes such as “designed”, “unique” and “premium” in the description carry an additional price premium of around 20–70% above the equipment itself (Falk, Larpin & Scaglione, IJHM, 2019, Swiss rural sample). In other words: the quality and positioning of the wellness have an effect separate from simply “I have a sauna”.
Step 03How to integrate a wellness zone into an existing property
Wellness is not “inserted” — it is integrated into the existing space and movement flow. A poorly placed premium sauna is used less often than a well-placed average one.
Flow is more important than the individual element. A wellness zone works as an uninterrupted flow: property → sauna → cooling → rest → return. If the flow has a gap — the sauna is too far away, there is no cooling, rest is only in the living room — the ritual is rarely repeated, and the guest does not experience it in the way they imagined from the photos.
Location is the least reversible decision. Moving it after execution is rarely cost-free. The practical maximum for regular use is proximity to the main building, ideally with a covered approach — a guest in February will not cross half the garden. (Execution prerequisites — base, connections, delivery access — are covered in the guide Site preparation.)
Contrast therapy makes the zone complete. A sauna and cold plunge are not “two products”, but one experience — and this is exactly what a financially stronger guest is actively looking for today. (Logic and execution: Contrast therapy.)
Commercial execution has additional requirements. When the zone is used by guests, not only the owner: robustness, simple remote control (a smart controller is not a bonus but a necessity), clear instructions, safety elements and ease of maintenance become just as important as design.
Step 04Business effect: three levers
Wellness affects revenue through three separate levers. None is a Croatia-specific figure for premium private rentals — that public data does not exist. Everything that follows is data from comparable markets, framed as a range.
Lever 1 — higher nightly rate
The largest public rental dataset shows that a hot tub in the rural segment carries around +15% to +22% higher nightly rate (AirDNA amenity report, 2024, global data). Sauna separately shows a weaker, but positive effect (+8% to +12%). Peer-reviewed confirmation that sauna and jacuzzi are significant price factors, with a stronger effect in the higher price segment, comes from Falk et al. (2019) — the closest existing proxy for a continental Alpine context.
Lever 2 — higher occupancy
Data shows +3% to +7% higher occupancy for properties with a hot tub, with the strongest effect precisely in colder months and outside peak season (AirDNA 2024 + industry sources).
Lever 3 — season extension
The most important lever, and the evidence is structural: Slovenian thermal-spa municipalities hold around 20% of national overnight stays evenly throughout the year — unlike the summer concentration on the coast (SURS, 2024–2025). This documents exactly the year-round pattern that wellness enables on the continent, where the surrounding infrastructure works all year. The same pattern already exists in Croatian Zagorje.
Step 05ROI projection
How to read this projection: the figures below are modelled projections based on your inputs and ranges from comparable markets. They are not a guarantee — the real result depends on the property, location, quality of execution and advertising method. We deliberately use a conservative and realistic scenario, without a “best case”.
| Starting parameter | Example input |
|---|---|
| Current nightly rate | EUR 150 |
| Overnight stays per year (current) | 120 |
| Current annual revenue | EUR 18,000 |
| Wellness effect | Conservative | Realistic |
|---|---|---|
| Increase in nightly rate | +12% | +18% |
| Increase in occupancy | +3% | +6% |
| Additional off-season overnight stays | +10 | +20 |
| Estimated new annual revenue | ~EUR 21,300 | ~EUR 24,500 |
| Additional annual revenue | ~EUR 3,300 | ~EUR 6,500 |
The figures are illustrative, to show the logic — adjust them according to your own inputs. With additional revenue in that range, a quality wellness investment returns over several seasons, and after that it is a clean upgrade to the value of the property and its revenue. The exact return depends on the project scope and is confirmed in consultation, not as a flat estimate.
Step 06Visibility and conversion
Wellness does not only affect price, but also how often the property is shown and clicked at all.
Booking.com is a crucial channel for wellness. It has a developed wellness amenity category with filters for sauna, hot tub and spa, and actively promotes them because they convert demand into reservations. Airbnb does not have a sauna filter, so guests looking for a sauna routinely move to Booking.com to find one (Booking.com partner sources, 2024–2025). Hot tub is among the six most searched filters on Airbnb globally.
Photography is the strongest and proven lever. Professional photography increases bookings by around 17.5%, and a high-quality cover photo of the space can raise the booking rate by up to +35% (Zhang et al., Decision Support Systems — peer-reviewed). Outdoor wellness that photographs spectacularly — a sauna under the stars, a hot tub with a view — is a double lever: content plus a visual that converts. Here, the ability to visualise before execution becomes part of the value.