Would You like to 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 spring 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 sleeping loft.


The building was removed from its original use in 1990 and renovated for light accommodation use in 2019. The transformer will be opened for visitors to rent from spring 2020. Pictures and details regarding the booking will be published during the winter and spring.


The transformer is located at the Sand Cove of Kuninkaansaari island, ten meters from the sea and about 20 minutes' walk from Vallisaari Island, where the Torpedo Bay's boat harbor and the nearest pier for water bus are located. Kuninkaansaari 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 5 pm and 8 pm. However, please note that the sauna is not available on all days of the week. You can find more detailed information about the sauna here. The sauna can be booked via booking calendar.

Between 5 pm and 8 pm, the sauna is in principle "earmarked" for accommodation guests, but if the sauna is not booked at least 7 days prior to the start of the stay, it will be freely available for reservation.

All additional services are available on the booking calendar.



Prices and payment (including VAT)

Overnight stay: 160,00€


Overnight stay + 3h sauna, total: 245,00€

  • water must be carried and the sauna heated by yourself


Overnight stay + 3h sauna, total: 305,00€

  • sauna is heated ready and water supplied

The accommodation can only be 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.



  • 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 with table and two chairs

  • 2nd floor: 2 armchairs and table

  • Outdoor furniture for outdoor use

  • The building has no electricity, running water or sewerage

  • The premises are equipped with battery powered lamps, which are delivered ready to use before the start of the reservation

  • 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

  • The smoking area is located outside the building

  • The row boat is located right next to the Transformer on the beach. Oars, life jackets, paddles, seat mounts and anchor can be found in the Shed.



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.



  • Dry toilets (2pcs) are located on the shore of the nearby Sand Cove.

  • 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

  • Personal toiletries

  • Additional lamps at your discretion


Make a booking


Booking in 2020

The reservation calendar is now opened!

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 from May to September. Reservation starts at 16:00 and ends the next day at 12:00.





JT-Line vessels operate to Vallisaari Island's Torpedolahti ("Torpedo Pier"). 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)