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Construction industry is a vital sector for economic and national development. However, the industry suffers buildability problems. Improving construction projects buildability is the duty of every key stakeholder. Thus, this study aims to identify and evaluate the project designers’ roles in improving construction projects buildability in Nigeria.

This study adopted quantitative research method. A purposive sampling approach was used in identifying the representative sample for the administration of the questionnaire survey. A total of 122 questionnaires were distributed to the targeted construction professionals, out of which 93 questionnaires were sufficiently filled and returned, representing a response rate of 76%. This study used descriptive and inferential statistics for data analyses.

The results from factors analysis show that the roles of project designers in improving construction projects buildability in Nigeria can be categorised into two constructs: “discuss fully the design objectives with builders” and “prepare cost effective and buildable designs”.

This study contributed to more effective buildability studies by highlighting the roles of project designers in improving construction projects buildability in the construction industry. An understanding of these roles is vital for reducing buildability problems as well as for improving and embedding buildability as a practice in construction management.