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Because of the sort of working environment and the nature of construction jobs, a high rate of poor mental health has been recorded in the construction industry. The aim of this study is to compare construction workers' mental health before and during the COVID-19 pandemic in Nigeria.

A survey questionnaire was developed and administered online to building environment professionals working on construction sites. Data were analysed using descriptive statistics such as mean and standard deviation. An independent sample t-test was also conducted to determine whether there was a significant difference in the mean before and during the COVID-19 infection.

The results show that mental health challenges were more prevalent during the COVID-19 pandemic compared to before the pandemic. The result of the independent sample t-test revealed that there exists a significant difference in all the mean before and during COVID-19 except sleeping too much or too little; having low or no energy and lack of emotion that shows no significant difference.

This study is the first to compare the mental health of construction workers before and during COVID-19 in Nigeria. The significance of this study was that it would provide an insight for construction managers and other decision-makers on the most critical mental health challenges on construction sites, which will help in an attempt to improve the mental well-being of construction workers.