The article discusses the importance of validating design life to create more sustainable buildings. By focusing on performance criteria and whole life designs, the construction sector can reduce CO2 emissions and material waste. The researchers emphasize the need for common language and transparency in decision-making to achieve life designs. They suggest implementing service life planning and reviews throughout the design process to ensure sustainability. The study also highlights the significance of disassembly-deconstructable construction and the use of ISO 15686 for existing and new buildings. Overall, the key findings stress the importance of reviewing and optimizing service life to create more sustainable products in the construction industry.