Sirena Superyachts 42M

• LOA 42.23 m, beam 8.8 m
• 433 GT, steel hull with aluminium superstructure
• Naval architecture by Van Oossanen
• Exterior by Luca Vallebona, interiors by Hot Lab
• Twin 1,450 hp MAN engines, 15 knots max
• Range 4,000 nm at 10 knots
• 10 guests in 5 cabins, up to 9 crew
• RINA classed for commercial use

A new line, announced in Monaco

Sirena unveiled the 42M at the 2022 Monaco Yacht Show as the anchor of an entirely new superyacht line, with 35 and 50 metre models planned around it. The move was deliberate. The composite range had carried the brand from 48 to 88 feet in six years, and the natural ceiling of GRP series production was coming into view. Steel and aluminium open a different market, different classification rules and a different kind of ownership conversation.

The build is happening at Sirena's specialist facility in Altinova, in the Yalova shipbuilding district within easy reach of the main Orhangazi yard. Construction of the first hull began in autumn 2023, the steel hull sections were completed and readied for assembly by mid 2024, and the hull and superstructure have since been joined. Progress has been unusually public for a first superyacht, with trade press walked through the shed at every stage.

Van Oossanen under the waterline

Naval architecture comes from Van Oossanen, the Dutch office with a deep record in efficient hull forms. The brief here was pure displacement cruising. A single pair of 1,450 hp MAN engines drives the 413 tonne yacht to a top speed of 15 knots, with ten knots as the working cruise. Nothing in the package chases a headline speed figure, and the numbers that matter to a passage-making owner benefit directly from that restraint.

At ten knots the 42M covers 4,000 nautical miles on one fuel load, enough to cross the Atlantic with margin in hand or to run a full Mediterranean season between bunkering stops. Modest installed power also means modest fuel bills, low vibration and machinery loafing far below its limits, which experienced owners of displacement yachts read, correctly, as a recipe for reliability and long service life.

Four thousand miles at ten knots puts a transatlantic crossing inside a single fuel load.

Vallebona outside, Hot Lab inside

Luca Vallebona shaped the exterior and the general arrangement, and the signature space sits aft, where a beach club opens through drop-down bulwarks to put guests just above the waterline. The 8.8 metre beam and 433 gross tons hand the design team generous volume for a 42 metre, and the yard promotes real customisation on this platform, with each hull developed closely around its owner.

Interiors are styled by Hot Lab of Milan, one of the busiest studios in custom yachting, and the master suite comes with a private patio, a sheltered outdoor terrace that belongs to the owner alone. The yacht is built to RINA classification for commercial use, which protects the option of chartering her and, just as importantly, imposes commercial-grade standards on structure and systems from the keel up.

Ten guests, nine crew

Accommodation runs to ten guests, with two more possible, across five cabins, served by up to nine crew in five cabins of their own. That is superyacht arithmetic in the proper sense, a service ratio approaching one to one, and it changes how the boat runs day to day. Meals, watersports, housekeeping and passage planning all happen around the owner's schedule instead of competing with it.

Five crew cabins also mean a professional captain, engineer and full interior team can be carried without compromise, which matters on a classed steel yacht with 4,000 mile legs in its programme. For owners moving up from the 88 or a comparable large composite yacht, this is the threshold where a boat becomes a small ship, permanently crewed, professionally maintained and ready to move on short notice.

Launch, buyer and what comes next

The yard has confirmed the first 42M remains on track for a July 2026 launch, with delivery scheduled the same year. Trade press reported in July 2026 that the yacht had found her owner, so hull number one will leave Yalova spoken for. The last publicly reported milestones covered interior furniture installation and final surface preparation ahead of topcoat, the closing phase of any steel build.

The interesting question for the market is hull two, and the planned 35 and 50 metre siblings around it. Sirena built its composite business on a strong value case against western European pricing, and if the same logic carries into classed steel, the 42M line lands in a segment where build slots at the established northern yards are scarce and expensive. Early buyers are effectively taking first position in that experiment.

Pour qui: An owner stepping up from a large composite flybridge into classed steel, who counts range, volume and crew service ahead of speed and wants an early position in a new superyacht line.