Since many neighborhoods were constructed after the Second World War, a significant number of these buildings will require renovation in the coming years. Particularly, neighborhoods known as “Bloemkoolwijken” (cauliflower neighborhoods), named after their distinct cauliflower-like urban structure, account for 20% of the current building stock. These single-family homes, constructed approximately 50 years ago, require upgrades to meet current insulation standards. However, the construction sector, and specifically the building materials used, significantly contribute to greenhouse gas emissions, highlighting the importance of environmentally friendly building materials. Therefore this research aims to explore the potentional of regional bio-based materials for add-on facade renovation of these Bloemkoolwijken. By utilizing locally sourced materials, this project aims to reinforce the local identity while reducing the carbon footprint associated with the renovation. The study focuses on upgrading insulation as well as the exterior layer of the buildings, given the flexibility, identity, lifespan and awareness that this gives. The research begins on a larger scale by investigating bio-based materials in vernacular architecture and gradually zooms in on the Netherlands, examining different regional landscapes and their associated vegetation. The final results provide insights into sustainable renovation practices by utilizing locally sourced materials from three distinct landscapes: peat, sand, and clay. The look-books offer a comprehensive overview of the possibilities in this field, while the proof of concept demonstrates the feasibility of such renovations.