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


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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. The terrace offers a magnificent view of the sea and the surrounding nature.


The building was removed from its original use in 1990 and renovated for light accommodation use between 2019 and 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's services cannot be reached directly by boat. You must walk to the island from Vallisaari along the embankment between islands. The transformer has sleeping places for a total of four people.


The Kuninkaansaari Island's wood heated sauna is located nearby and for extra charge, guests can book a sauna at the same time. A rowboat and two SUP boards are also available to guests, free of charge.

Transformer accommodation is available during the summer season from the beginning of May to the end of September.


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, 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 self-service wood-heated sauna during your stay from 6 pm to 10 pm or from 7 pm to 11 pm . Water must be carried and the sauna heated by yourself.

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

  • Accommodation guests, Tuesday to Saturday from 6 pm to 10 pm or from 7 pm to 11 pm

  • Boater's Sunday sauna on Sundays from 1 pm to 4 pm and 5 pm to 8 pm

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



Prices and payment in 2023 (including VAT)

Accommodation prices from 94,50€. Check the current price of that time in the online store's booking calendar.

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. Sheets can also be rented for the duration of the stay.

  • 1st floor: dining corner and cutlery for four (deep and shallow plates, mugs and spoons, forks and knives)

  • 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 are located on the shore of the nearby Sand Cove

  • The building has electric heating, a refrigerator, a microwave, an electric kettle, bluetooth-radio and electric lamps

  • There is an electric grill ​behind the building for guests to use and the possibility to use their own camping stove

  • The smoking area is located outside the building

  • The row boat and two SUP-boards are free to use and located right next to the Transformer



Good to know


  • You will receive written instructions in your email regarding your arrival and use of the facilities week before of your stay. The key code will be sent the day before the accommodation.

  • Reservation starts at 15:00 and ends the next day at 12:00.



  • 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
laituri sumussa.jpg
Kannattaa ottaa mukaan

Make a booking

Varaa majoitus

Booking in 2024

Make a booking by going directly to the booking site. Accommodation is available from the beginning of May until the end of September.


For the 2024 season, FRS Finland has published the new Vallisaari Island's operating timetables on its website, of which the most relevant excerpts are below. Due to shorter operating hours than before, accommodation services will not be as comprehensively available in 2024 as in previous years.

  • The service starts at the beginning of May and ends at the end of September.

  • Between 1-12 May and 16-30 September 2024, the water bus operates only on Fridays, Saturdays and Sundays.

  • Between 13 May and 15 September 2024, the water bus operates from Tuesday to Sunday.

  • The water bus does not operate on Mondays.

  • Prices: adult round-trip €13.90, special groups round-trip €9 (special groups include children 7-17 years old, students, pensioners, unemployed and men in the military and civil service)




Kuninkaansaari Island can be reached via Vallisaari Island with connecting ships. From Vallisaari to Kuninkaansaari, you travel along the embankment. You should reserve time for a walk from Torpedo Bay approx. 15-20 minutes (from Pilot Yard approx. 25-30 minutes). You can also come to Vallisaari with your own boat. Kuninkaansaari does not have a berth for your own boat.


Phone +358 (0) 40 764 9766

(Mon-Fri 10am-5pm, Sat-Sun 11am-4pm)

Helsingin Saaristoretket

Business ID: FI27652404

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