A lump sum cannot be precisely determined. Here, as well, matters whether the Brownfield or the Greenfield approach will be carried out, as well as which processes are being in use. Basically speaking, when it comes to the Greenfield approach, it is practically a completely new implementation of SAP. However, if you choose the Brownfield approach, then a couple of issues should be considered on the expense side.
Roughly speaking, the costs for a mid-size company with ca. 500 employees can be around 350.000€ – 500.000 €.