Investigating the Role of Quantity Surveyors in Combating Corruption in Nigerian Public Procurement

Corruption in public construction procurement represents a significant loss of public value in Nigeria, and quantity surveyors are positioned within procurement systems in ways that can either facilitate or resist corrupt practices. This study investigates the role of quantity surveyors in combating corruption in Nigerian public procurement, drawing on evidence from FCT, Lagos, and Kano. A qualitative dominant mixed-method design was employed, with 30 in-depth interviews of senior practitioners, anti-corruption agency officials, and public servants, complemented by a survey of 178 quantity surveyors. Thematic analysis and descriptive statistics were applied. Findings reveal that quantity surveyors are aware of systemic corruption in public procurement including specification inflation, bid rigging, and fictitious variation claims but often feel professionally and institutionally disempowered to intervene. Fear of professional marginalisation, lack of whistleblower protection, and unclear reporting obligations under NIQS ethical codes are identified as barriers to active anti-corruption engagement. However, the study also finds that the use of rigorous bills of quantities, transparent tender evaluation, and independent cost certification reduces quantifiable corrupt leakage in projects. The study makes an original contribution by treating quantity surveyors as active participants in Nigeria's anti-corruption architecture rather than passive observers. Recommendations address professional ethics, legislative protection, and engagement with the Economic and Financial Crimes Commission. Keywords: corruption, public procurement, quantity surveying, Nigeria, professional ethics