Assessment of Variations and Their Financial Impact in Building Projects in Anambra State

Contract variations are an inherent feature of building construction projects, but their cumulative financial and programme impact often undermines project success. This study assesses the nature, frequency, and financial impact of variations in building construction projects in Anambra State. A descriptive survey design was employed, targeting quantity surveyors, contractors, and project managers involved in residential and institutional projects across Awka, Onitsha, and Nnewi. A total of 83 respondents participated in structured questionnaire administration, and selected project variation registers were reviewed. Data were analysed using mean item scores and Pearson correlation. Findings reveal that design errors, client-initiated scope changes, and unforeseen site conditions are the most frequent sources of variations, collectively accounting for over 70% of all variation orders reviewed. The average variation cost as a percentage of original contract sum was found to be 14.3%, with some projects recording variation claims exceeding 35%. The study identifies inadequate pre-contract design development and poor site investigation as root causes of avoidable variations. Recommendations include mandatory design freeze protocols before contract award, comprehensive ground investigation requirements, and structured change management procedures involving the quantity surveyor as gatekeeper for all variation approvals. The study supports the use of NEC contract forms that provide structured early warning and compensation event mechanisms. These findings add to the South East Nigeria knowledge base on contract cost management. Keywords: contract variations, financial impact, building projects, Anambra State, change management