Rantasauna, more commonly known as 'Rantsu', is a sauna built and funded by engineering students.

Rantasauna is located in Otaniemi behind Jämeräntaival 5. Rantsu has two separate spaces; a large space and a small space, which can be rented together or separately. The large space is ideal for larger sauna evenings and academic seated dinners, while the small space is perfect for smaller groups. There is a large barbecue in front of the terrace. Additionally, there is a pier, although it's worth noting that the shoreline is relatively shallow.

Rantasauna is available from 2 pm to 7 am. The sauna in the large space can be heated from 12 noon till 3 am. Upon arrival, users are responsible for heating up the sauna by switching on the heater. The maximum heating time is 8 hours. For cleaning and maintenance purposes, it is important that the facilities are empty outside of user hours. If it is necessary to extend user hours, this must be agreed on in advance with AYY. Additional user hours will be charged at an hourly rate.

There is firewood at Rantasauna for heating the wood sauna in the small space. Remember to also check the log shed next to Rantsu! The key to the shed can be found in the sauna. 

Large space

Sauna: Space for approx. 30 people, automatically heated electric stove
Lounge area: Chairs and tables for approx. 25 people, sofas in front of the windows
Kitchen: Hob, oven, microwave, dishwasher, coffee maker and cold storage for drinks. No dishes or cutlery.
Other: Fireplace. High-quality audio and projection screen.

Small space

Sauna: Space for approx. 10 people. The small space has a wood-heated sauna heated by users. Don’t forget to take matches with you!
Lounge: Sofas and table. Space for approx. 10 people.
Kitchenette: Refrigerator and hob. No dishes or cutlery.
Other: Fireplace

Hot tub

Rantasauna also has a hot tub called 'Lotina'. The use of the hot tub requires renting one or both spaces of Rantasauna. It is prohibited to use your own hot tub at Rantsu. The violation of this rule will result in a fine of EUR 100.

Learn more about Rantasauna using this virtual model.

Please note! If you have made your reservation in TILA system, you can activate an access code and there is no need to pick up the keys from AYY office. The access code is activated 15 minutes before your reservation starts. If you do not have access to TILA system, you will receive a key from AYY. If you have also booked the hot tub, you will receive the keybox code in the attachment to your invoice.

Accessibility information

Small space: The lounge is accessible. Shower and sauna facilities are partly inaccessible due to narrow doors and small space. There is no accessible toilet.

Large space: The lounge is accessible through the sliding door of the small space. The dressing room, sauna and shower rooms are spacious and accessible. There is no accessible toilet.

Hot tub: The hot tub is inaccessible. There are stairs to the terrace of the hot tub. Otherwise, the terrace is accessible.

Access to the yard of Rantasauna is not entirely accessible. The most easily accessible route is via the waterfront walkway. At the end of the walkway at Otaranta 6-8, there is a parking lot available for car parking or taxi drop-off.



    Large space

    Rantasauna keittiö

    Sauna in the large space

    Rantasauna pukuhuone

    Small space


    Sauna in the small space

    Rantasauna palju

    Floor plan

    Booking of facilities and price list
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