Earthboat redefines hospitality by transforming underused leisure facilities into sustainable, eco-friendly retreats. Built entirely from Cross-Laminated Timber (CLT), these mobile cabins are designed without fixed foundations, enabling them to “float” above the ground and minimise environmental impact. The project provides new purposes for spaces that became less used over time, such as ski resorts, fishing ponds, rugby grounds, and golf courses—facilities often built during Japan’s late 20th-century economic boom. By introducing Earthboat to these sites, the project diversifies how people interact with nature and revitalises spaces that would otherwise remain underused. Earthboat’s mobility ensures that once a site has been rejuvenated, the cabins can relocate to other locations, avoiding the creation of permanent structures that may become redundant—such as the many concrete leisure facilities built in the late 20th century. Each unit is thoughtfully designed to offer modern comforts, including integrated saunas, while maintaining harmony with its surroundings. Currently, Earthboat is active in seven locations across Japan, with around 60 units completed or in progress. More sites are expected to open this year, further demonstrating its ability to adapt to a variety of landscapes and needs. Earthboat showcases the untapped potential of CLT in small-scale architecture, an innovative approach in Japan where CLT is often used only for large-scale construction. By proving its adaptability for compact buildings, the project diversifies CLT’s applications and paves the way for broader use in Japan’s architectural landscape. Earthboat sets a precedent for sustainable design, environmental regeneration, and innovative hospitality by offering a new way to engage with and revitalise spaces from the past.