D6.5 – Best Practices and Scalability Guidelines of the CHEK Project. This deliverable synthesises lessons from pilot demonstrations in four European municipalities (Ascoli Piceno, Lisbon, Vila Nova de Gaia, and Prague), focusing on the development of digital building permit (DBP) processes. It identifies domain-specific best practices, evaluates the scalability and replicability of CHEK solutions, and provides actionable recommendations for municipalities, national governments, and European institutions aiming to adopt and scale DBP systems. The document also includes insights on process mapping, automation, user involvement, interoperability, and the use of open standards like IFC and CityGML for data exchange.