Early stage multi-level cost estimation for schematic BIM models

Previous studies reveal the need for a tool to evaluate various aspects of building design in early design stages. This paper proposes a multi-attribute based tool to address this need. The tool allows users to evaluate the functionality, economics and performance of buildings concurrently with building design. To illustrate the mechanics of the tool, the paper details the cost estimation module that enables quick and intuitive exploration of early stage design in a popular 3D modelling environment. Measurements are automatically extracted from 3D models and profile driven estimates are revised in real-time. The data model uses a flexible unit rate system that can easily be extended to other estimate dimensions such as carbon estimates and waste estimation. The approach illustrated in this paper is applicable to 3D modelling environments that support free form geometry for massing purposes other than the one chosen for this study. (C) 2012 Elsevier B.V. All rights reserved.