A statutory energy audit costs €4,000 to €10,000 excl. VAT depending on site size, using the NF EN 16247 method and carried out by a qualified auditor. For an SME, a voluntary audit costs €3,000 to €7,000 excl. VAT, often with 30 to 50% funding from ADEME through Diag Eco-Flux or regional funding. It costs less than a complete Bilan Carbone® (€10,000 to €30,000 excl. VAT as a privately commissioned service, €6,000 excl. VAT with Diag Décarbon'Action), because it does not involve scope 3 collection.
Read the source article: Energy audit or Bilan Carbone®: what is the difference?