In construction, bids are being solicited on the basis of a deliverables list, as opposed to unit prices.
More frequently, the complete services for a "functioning facility" are being described by means of a "functional specification".

This practice is referred to as "lump sum" pricing, avoiding the unit pricing associated with engineering services, etc.
It is widely used in the Process Control (Prozeßleittechnik) field for the programming of a control system.

es gilt zum Baubereich!