Various factors and processes contribute to a robust cost estimation of any design. How then is it possible to have a more realistic estimate considering most constructions are not only delayed, of considerably less quality as envisaged but also often over budget. The secret is to embark on cost outlines from early design stages. The different building components that have to be considered including, the sub structure and the superstructure can all be incorporated in an ongoing process of cost refinement. Different building components like roof, wall, floor etc.; items required like rebar, stud, paint, etc.; materials such as steel, pine, vinyl, etc.; the size and description of the items along with its estimated quantity and unit cost are all considered while creating a precise building materials cost estimate. But they’re better understood from an integrated perspective where specialist contractors can be tied into some form of cost structure by participating in the design and contributing to its optimisation processes. Only in this way can a robust process be embedded in cost estimation to better contribute to a smooth execution and implementation process of the design.