Conventional composite plastics that are widely used in the building industry, are becoming more and more criticized in regards with their unsustainable petrochemical resources and their increased embodied energy. Under the global environmental awareness of the recent years, new polymeric materials based on renewable natural resources have emerged. This master thesis investigates the potential of bio-plastics and natural fibres to be used in fibre-reinforced composites for load-bearing and durability demanding applications. The research is applied on the real scenario of a short-span pedestrian bridge in a logistics park close to Amsterdams International Airport.