This research analyzes data of major construction projects from oil and gas industry executed in Alberta, Canada and USA (from 2019 to 2015) to identify relationship of project contextual settings and execution best practices with schedule growth. The researcher found that project’s contextual settings like; project type, execution strategy, project nature, delivery method and place of execution can lead to schedule growth. Also execution best practices, such as; timely delivery and accuracy of engineering deliverables, modularization, communication, working relationship, project team’s expertise, core project team turnover, constructability, construction productivity and risk management were found correlated with the schedule growth. Researcher concludes that organizations should adopt execution best practices and mitigate impact of project contextual settings to avoid schedule growth.