Green Building Construction Projects in Singapore: Cost Premiums and Cost Performance

This study aims to investigate the cost premiums and cost performance of green building projects. After an extensive literature review, relevant data from 242 traditional and 121 green building projects performed by 30 different companies were collected through a survey in Singapore. The results indicate that the green cost premiums range from 5% to 10% and that project type and size are significant factors affecting the cost premiums. Furthermore, the cost performance is mostly over budget, ranging from 4.5% to 7%. Finally, this study proposes some feasible solutions for cost premiums reduction and cost performance improvement.