GRO is the sustainability assessment tool developed by the Flemish government to guide sustainable building and renovation. It evaluates key themes like energy, materials, water, mobility, and adaptability throughout a building’s life cycle.

GRO supports decision-making in each project phase—from design to use and eventual dismantling—ensuring long-term quality, resilience, and alignment with regional sustainability goals. It encourages integrated, context-aware choices for buildings in Flanders.