The Netherlands faces a substantial wave of infrastructure renewal as bridges, tunnels, locks and related assets built after the war reach the end of their service lives. Traditional procurement often struggles with complexity, efficiency and market capacity limits. Rather than prescribing DBFM as a single model, this thesis treats DBFM as a modular set of design principles that can be tailored to context. The study presents a decision making framework that profiles five context dimensions, uncertainty, complexity, repeatability, operation and maintenance importance and scarce market capacity, and translates them into three contract proposals for renewal projects. These contract proposals illustrate how the principles work in practice: a two phase DBM with maintenance for highly uncertain and complex renewals, a framework agreement with standardised solutions for repeatable objects and a budget driven open book portfolio for capacity constrained settings. The framework helps public clients design a contract based on the specific project context.