A target date for completion may be identified in the feasibility study for some important reason. All costs must be projected for the anticipated completion date. The complexity of this document depends on the project. A small private building requires less study than a large public project. Design Development Architects and engineers analyze the systems of the building to plan the structure, HVAC, lighting, facade, sitework, etc.
Additional data allow more precise estimates and revised expectations for activities.
Phase II - Design Documents Production staff of architects and engineers performs calculations, detailed technical analysis, and selection of all building components. Architects and engineers prepare drawings and specifications to document these decisions. The preliminary design may require about 40 percent of the total design time. At the completion of preliminary design, most major decisions are established and ordinarily there will not be sweeping changes. A preliminary estimate is normally made at this point.