No. The cost depends on the size of the company, the complexity of the boundary and the maturity of the data, not on the method chosen. Allow €10,000 to €15,000 excl. VAT for a single-site SME and €15,000 to €30,000 excl. VAT for a multi-site mid-cap company, and more for large groups. Diag Décarbon'Action (in French) (in French) brings the net cost of a first carbon footprint at an eligible SME down to €6,000 excl. VAT.
Read the source article: Bilan Carbone® vs GHG Protocol: the 5 differences that matter