LUXURY REIMAGINED: INSIDE TDOS’ DESIGN OF FIRST-EVER FOUR SEASONS YACHT
TDoS (Tillberg Design of Sweden), part of the Viken Group, has revealed the story behind its latest extraordinary luxury yacht design: high-end hospitality brand Four Seasons Yachts’ inaugural vessel, the 207-metre, 34,000 GT Four Seasons I.
Embarking on its maiden voyage in the Mediterranean in March, the first-ever vessel for Four Seasons Yachts establishes a new benchmark for luxury hospitality at sea.
Working closely with Four Seasons and the project’s Italian builder, Fincantieri, from the earliest stages of the project, TDoS developed the yacht’s overall Design & Brand Manifesto, shaping the exterior identity, master planning, suite layouts and guest experience throughout the vessel.
Alongside the exterior architecture and overall spatial planning, TDoS designed the majority of the onboard spaces, including all guest suites, outdoor environments and the two-level transverse marina.
Timeless elegance at sea drawing inspiration from the glamour and proportions of classic yachts, and evoking the intimacy and welcome of a private yacht from the moment that guests step on board, Four Seasons I combines timeless elegance with contemporary naval architecture, with a design brief of ‘Christina O meets James Bond.’ Classical symmetry, refined detailing and a strong private-yacht spirit are met with floor-to-ceiling glazing, expansive terraces and seamless connections to the sea.
The yacht has been conceived to feel like a mirage from another era, elegant, composed and cinematic, but with the technical performance, openness and guest experience expected from a modern yacht.
The exterior colour of Four Seasons I also has a historically-inspired origin: it was chosen following a visit to the TDoS studio, where Co-Founder of Viken Group, Fredrik Johannson’s vintage Porsches provided the inspiration for the tone and character of the palette.
Maximum transparency notably, the construction of Four Seasons I was developed by TDoS and Fincantieri’s engineers to maximise transparency and provide breathtaking views of the sea and destinations from all onboard spaces. This created windows that extend from floor to ceiling, and provide close to 360° glazing around the entire yacht.
From a naval architecture perspective, there are several other defining features worth highlighting. The 20-metre aft pool with its raisable floor is both a technical and experiential centrepiece, allowing the space to transform depending on use.
The two-level transverse marina establishes a strong, direct relationship to the sea, while details such as concealed lifeboat cover flaps ensure the exterior remains visually clean and uninterrupted. The canoe stern reinforces the classic silhouette, complemented by more contemporary elements such as the curved glazing of the funnel suite and large four-metre telescopic doors in the forward and aft top suites, which open entire living spaces to the horizon.
Iconic Funnel Suite as one of Four Seasons I’s most iconic features, the 10,000-square-metre funnel suite is positioned at the forward-facing prow and offers guests sweeping 270-degree panoramic ocean views.
Featuring dramatic curved glazing, the suite establishes a strong visual identity for the yacht while reinforcing the project’s focus on openness, light and connection to the horizon.
It also posed numerous architectural challenges for both TDoS and Italian builder Fincantieri, as Co-Founder of Viken Group, Fredrik Johannson, highlights: “The funnel suite required close integration between architecture and shipyard engineering. Its curved glazing was probably the most delicate exercise in combining design and engineering. Its exceptional position within the yacht, and the lift access from sea level, also required a complex balance between structure, circulation, privacy, views and guest experience.”
Sea-centred living Four Seasons I has been designed around the sea as its central design feature and focal point. All onboard suites face the ocean, with expansive glazing and carefully planned layouts creating uninterrupted views throughout. TDoS has also introduced a central “Spine Concept” in collaboration with the shipyard engineers, replacing the traditional perimeter structure with a central backbone. This innovation enables extensive floor-to-ceiling glazing and near 360-degree transparency throughout the yacht.
In addition, the use of a transverse marina on board Four Seasons I further strengthens this all-important connection to the water, transforming into a private sea-level retreat where guests can swim, relax and experience destinations in a more intimate and personal way.
High-end residential suites with a total of 95 expansive suites found on board, these highly personal living environments have been designed to be closer in spirit to a private seaside residence than traditional shipboard accommodation, balancing Four Seasons’ residential-like comfort with the yacht’s strong connection to the sea.
“Materials throughout Four Seasons I were selected to create a sense of timeless residential luxury, while also meeting the technical and durability requirements of life at sea,” explains Johansson. “We aimed to create an atmosphere of utmost sophisticated exclusivity, while offering a long life and being considerate of both people and the environment.”
He continues: “We focused on finishes that express timeless beauty such as anigre wood panelling with an Astrakhan finish, solid parquet flooring, and carpets paired with curated art, artefacts, and books within featured vitrine cabinets. In the bathrooms, Brazilian aqua green quartzite is used alongside carefully developed porcelain stoneware replicas, allowing us to reduce the use of natural resources without compromising the visual and tactile experience.”
All beds in all suites are oriented to face the sea, to maximise guests’ ocean views. The suites are designed to feel highly personal and residential, offering guests an unsurpassed sense of generous space and effortless flow. Above each bed, there is a sunbeam-inspired straw marquetry feature with a central mirror, bringing warmth and a subtle focal point to the rooms.
In the signature suites, the terraces are centred around private splash pools and generous sunbeds, while smaller details such as a star constellation map etched into the stone coffee tables – add layers of discovery.
Guests can also combine suites through interconnecting doors, allowing for flexible configurations tailored to individual needs. In the loft suites, double-height volumes extend both internally and out onto the terrace, enhancing the sense of space and connection to the surroundings.
Outstanding service levels finally, the layout of Four Seasons I has been meticulously planned to represent the hospitality brand’s renowned service culture. Every guest interaction feels smooth, intuitive and highly personalised, with every request anticipated before the guest asks, thereby closely aligning with Four Seasons’ Unscripted Care approach.
Operational flows are designed to maximise efficiency and discretion, with guest and crew circulation kept entirely separate to maintain a calm and effortless atmosphere throughout the yacht. This approach allows service to feel present yet invisible, reinforcing the sense of privacy, comfort and quiet luxury that defines the onboard experience.
