Sustainable management of the building stock: A Delphi study as a decision- support tool for improved inspections

•The Delphi study is designed to identify building inspection challenges within the Spanish context.•This study has been used as a decision-support tool to develop a new technology.•Inspection technologies must tackle the challenge of appraising façade condition.•Data collected from improved inspections would guide decisions during renovations.•Suitable information management favors improvements in façade performance.