Spend the night on the Kuninkaansaari island, while enjoying the nature, history and proximity of the sea!


Accommodation in the old tower transformer will be possible from 2020!

Kuninkaansaaren tornimuuntaja

Built around 1930, the tower transformer rises to a height of eight meters on a rocky shore of the Sand Cove on Kuninkaansaari island. Spectacular view of the sea and the surrounding nature open from the windows of the 2nd floor.


The building was removed from its original use in 1990 and renovated for light accommodation use between 2019 and 2020. The transformer will be opened for visitors to rent from spring 2020.


The Transformer is located at the Sand Cove of Kuninkaansaari island, where guests have their own beach, swimming pier and a rowboat. The walk from Vallisaari, where the Torpedo Bay's guest harbour and the nearest pier for water bus traffic are located, takes about 20 minutes. Kuninkaansaari island cannot be reached directly by boat. You must walk to the island from Vallisaari. The transformer has sleeping places for a total of four people.


The Kuninkaansaari Island's sauna is located nearby and guests can book a sauna at the same time. A rowboat is also available to guests, free of charge.

Things to do and see

Both islands have a wide variety of activities, history and nature to explore. You can find more information about the history and sights of the Kuninkaansaari Island on these pages, as well as on-site information boards and guides. For example, you can play yard games at the Shed, explore perhaps the shortest nature trail in Helsinki, take a trip around the islands on the row boat or try solving the Mystery of Kuninkaansaari Island.


When you are hungry, you can enjoy a picnic in the open air or visit Vallisaari and try their facilities and services.










Additional services

It is possible to book the nearby wooden sauna during your stay between 6 pm and 9 pm. However, please note that the sauna is not available on all days of the week.

For the time being, the sauna can be booked as follows:

  • Freely bookable to all, Mon - Tue and Thu - Sun from 13:00 to 16:30

  • Wednesday is a maintenance day, no reservations

  • Accommodation guests, Mon - Tue and Thu - Sun from 18:00 to 21:00

You can find more detailed information about the sauna here. The sauna can be booked via booking calendar.



Prices and payment (including VAT)

Overnight stay: 145,00€


Overnight stay + 3h sauna as a self-service, total: 210,00€

  • water must be carried and the sauna heated by yourself


Overnight stay + 3h sauna pre-heated, total: 270,00€

  • sauna is heated ready and water supplied

The accommodation is paid for in advance by invoice. The invoice will be emailed after the booking confirmation. Learn more about billing and booking terms here. Once the payment has been received, more detailed instructions, as well as information about the accommodation and keys, will be emailed to you.

Equipment and facilities


  • Sleeping places for four people (2 + 2)

    • Double mattress, blankets and pillows on the 2nd floor sleeping loft

    • Sofa bed with mattresses, blankets and pillows for two people on 1st floor

    • Bed linen or sleeping bags are required. If you are using a sleeping bag, bring a pillowcase and bed sheet to protect your mattress and pillow.

  • 1st floor: dining corner

  • 2nd floor: 2 armchairs, a table and a box for blankets

  • Terrace and outdoor furniture for outdoor use

  •  Beach and a swimming pier

  • The building has no running water or sewerage

    • Drinking water must be brought by yourself or ordered in advance at the time of booking

    • There is a hand-washing facility outside the accommodation

    • Dry toilets (4pcs) are located on the shore of the nearby Sand Cove

  • The building has electric heating, a refrigerator, a microwave, an electric kettle and electric lamps.

  • The smoking area is located outside the building

  • The row boat is located right next to the Transformer on the beach



Good to know


  • You will receive written instructions in your email regarding your arrival and use of the facilities well in advance of your stay. The keys are located in a locked key box near the accommodation, the code of which is included with the instructions.

  • Guests must fill in a passenger notification upon arrival. The completed notification will be left in a reserved, locked inbox. If you wish, you can print out and complete the passenger notification in advance here.



  • Any kind of fire (grilling, candles, etc.) inside and outside the building is forbidden.

  • Roads and paths are difficult at times and there are relatively many ascents and descents.

  • The building is narrow and tall; upstairs to the second floor and loft. This space is not suitable for disabled or small children.

  • The accommodation must be empty at 12 noon on the day of departure. Residents must clean the accommodation themselves for subsequent residents. Cleaning should include at least sweeping the floors, taking out the trash, bottles and cans, and wiping the table surfaces. Cleaning supplies can be found at the property.


Row boat

  • We do not sell fishing permits on the island, so be sure to obtain them in advance if you plan to fish.

  • Max 4 people on the boat.

  • To the east of the Kuninkaansaari island is the military area of Santahamina. The protection area is accompanied by a 100-meter ban. The area is marked with no docking signs. This limits movement and anchoring in the area.



You should take with you


  • Towel and swimsuit if you plan to swim or go to sauna. An unofficial beach is located at the Sand Cove

  • Drinks, food and cutlery

  • Hand towel

  • Personal toiletries

  • Additional lamps at your discretion

Soutuvene, Kuninkaansaari
Uimalaituri, Kuninkaansaari

Make a booking


Booking in 2020

The booking calendar will opened on 5th of June.

Accommodation must always be booked in advance from the booking calendar. Reservations can be made up to 48 hours before the start of the booking.

The transformer is bookable on all days of the week. Reservation starts at 16:00 and ends the next day at 12:00.

Book the sauna below or click on the link to go directly to the booking site.





JT-Line vessels operate to Vallisaari Island's Torpedolahti ("Torpedo Bay"). From Vallisaari to Kuninkaansaari you can walk along the embankment. It is advisable to book time for about 15-20 minutes of walking from Torpedolahti (25-30 minutes from Luotsipiha). You can also come to Vallisaari with your own boat.

Terms for bookings


Phone +358 (0) 40 764 9766 (Mon - Sat 11:00 - 16:00)