For Diag Décarbon'Action: no if the inventory is less than 5 years old, yes if it is older. For ACT Pas à Pas: available once you have an inventory less than 2 years old. For Diag Éco-conception: eligible even with an existing inventory; it is a different scheme funding product LCA.
Read the source article: Bilan Carbone® and LCA funding in 2026: 3 schemes you can combine