Abstract
The cost estimation of public sector projects in Brazil must observe the prevailing legislative framework to reduce the likelihood of under-and-over pricing of construction works and potential corruption. Therefore, initial estimates for projects must be prepared using the National System of Costs and Civil Construction Indices (SINAPI). This is a labor-intensive process, and the result estimates produced may be inaccurate. Therefore, it becomes difficult to determine if the under-or-over pricing of works has arisen during the tendering process. The problem is approached with new guidelines for improving the accuracy of estimates that utilizes SINAPI methodology with Building Information Modelling cost estimation. The research method used was Design Science Research (DSR) developing: problem diagnosis, solution proposition, implementation, and evaluation of contributions. The proposed guidelines were tested in two projects: a multi-family residential building and a Reference Center for Social Assistance (CRAS) using a BIM authoring platform. It has been demonstrated that text parameters can be used to identify material specifications, the geometry of elements, and specify substrates, improving the process to generate an estimate following ‘SINAPI factors’ tree’ elemental costs. The guidelines comply with prevailing Brazilian legislation and can improve the process and accuracy of the pre-tender estimate.
Highlights
Brazil is one of the largest economies in the world and is a developing nation
The unitary costs for elements and services must be obtained based on cost compositions, limited to the National System of Costs and Civil Construction Indices (SINAPI) (BRAZIL, 2013), maintained by Caixa Econômica Federal (CEF), which is the largest public bank in Brazil and responsible for providing housing financing
This paper presents an approach for developing a pre-tender estimate for public sector infrastructure using Building Information Modelling (BIM) with elements modelled up to Level of Development (LOD) 300 following the ‘SINAPI factors’ tree’ methodology
Summary
Brazil is one of the largest economies in the world and is a developing nation. It is significantly investing in its economic (e.g., roads and rail) and social (e.g., schools and hospitals) infrastructure to sustain its well-being and prosperity. The public sector's primary procurement model in Brazil to deliver its infrastructure asset is the traditional Design-Bid-Build (DBB). The public sector is responsible for preparing a complete set of designs (e.g., architectural and engineering) and the pre-tender estimate, conducting an auction to contract an asset and supervising the winning company. While the ‘factor tree’ results in more accurate cost compositions, this new methodology increases the number of compositions and the complexity of the estimation process (FELISBERTO, 2017)
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