More than the sum of its parts: Considering interdependencies in the life cycle material flow and environmental assessment of demountable buildings

•We present a new method for material flow analysis in demountable buildings.•The method reveals the interdependencies between building parts.•The material flows of a case study are combined with a life cycle assessment.•Life cycle environmental impact can be 162% larger than if calculated with EN 15,978.•Low environmental impact can be reached even without reuse.