To achieve the goal of fully circular buildings, the use of bio-based solutions is growing, with some buildings using natural waste or bio-based components. This study aims to explore the potential for integrating circularity principles into the use of bio-based components. The findings highlight six key factors that must be considered to ensure the success of circular bio-based components: environmental impacts, cost, locality, knowledge (cultural and technical), future use/reuse, and policies. The study also emphasises that locality plays a crucial role when selecting bio-based products and applying circularity principles. However, barriers such as policy limitations, cost concerns, and gaps in technical and cultural knowledge exist in certain regions. Therefore, it is essential to evaluate the availability of local materials and assess the potential for scaling up their use within specific regions. This approach ensures that bio-based solutions are effectively implemented, taking into account regional constraints and opportunities for growth.