Oil and Gas (O&G) industry is the primary source of the gross national income in gulf area. This industry is facing construction related issues that lead to cost overrun and delay in construction schedule of the construction related tasks. During COVID 19 pandemic, Sultanate of Oman O&G construction projects are facing many problems due to many factors. As a result and use these factors, about 70% of the major projects suffer from schedule slip and increasing costs. This has direct impact on the government budget with about 15% of GDP.  This research is discussing the main factors and its root causes that have direct impact on construction cost and schedule for O&G projects. This is has been done based on the literature and the conducted survey.