Sanctum, a contemporary forest retreat in Lithuania

Hidden in the forests beyond Vilnius, Sanctum is designed to blend in rather than dominate. From the outset, the project invites visitors to slow down and reconnect with nature. The architecture remains calm, understated, and tactile. The buildings follow the natural terrain instead of reshaping it. As a result, the retreat merges discreetly into its forest surroundings. Kebony wood cladding and roofing support this dialogue with nature. Notably, more than 50,000 linear metres of Kebony wood create a unified natural envelope.

An architecture shaped by patience and precision

“The design and construction of Sanctum took nearly four years,” say Arūnas Liola and Greta Gulbinskė of Arches Studio. Completed in 2026, the project reflects a long-term vision and attention to detail. Every decision considered the site, the materials, and architectural longevity. The retreat includes: a main building with accommodation and shared spaces a multipurpose hall that can host up to 50 people standalone cabins and wellness spaces located deeper in the forest As a result, Sanctum presents itself as a cohesive ensemble rather than a single isolated building.

Why Kebony wood was chosen

From the outset, durability and low maintenance guided the selection of materials. The client was looking for reliable solutions in a forest environment. “The goal was not to create an iconic structure, but a robust ensemble in harmony with the landscape.” — Arches Studio Kebony wood supports this ambition through: a natural aesthetic high dimensional stability long-term durability without surface treatments Developed in Norway, Kebony uses a patented bio-based modification process. It therefore delivers hardwood-level performance with a reduced environmental footprint. Landscape integration through material continuity At Sanctum, Kebony wood is installed as a ventilated façade system. It is fixed to a timber substructure using stainless steel fixings. The same material covers the façades and the roof. Thus, architectural unity remains consistent across the entire site. Over time, the wood weathers naturally.