Abstract: Bio-based composite materials in architecture have gained various new applications due to their low cost, renewable and environment-friendly properties. This paper demonstrates the use of bio-based building materials for load bearing structures through a one to one double-curved, parametrically designed segmental shell. The Structure consists of light, single-curved wood and bio-composite elements where lignocellulosic-based core was reinforced by long wooden-fibres in the form of veneer. In this paper we furthermore discuss the fabrication technique of the 3.6 m height research pavilion covering 55 m2 as well as possibilities of bio-composites.