Delay is one of the biggest problems often experienced on road construction project sites. Delays can instigate negative effects such as increased costs, loss of productivity and revenue many lawsuits between owners and contractors and contract termination. The aim of this project is to investigate the causes and effects of delay on building construction project delivery time. Random sampling technique was used in this study. Population sample of 200 was used in this work. A total sample of ninety three 123 was deployed. A structured questionnaire in Likert scale was used in data collection. There are many factors that induce delay on construction projects, however in some of identified factors includes: lack of funds to finance the project to completion, changes in drawings, lack of effective communication among the parties involved , lack of adequate information from consultants, slow decision making and contractors insolvency, variations among others. Also, project management problem, mistake and discrepancies in contract document, equipment availability and failure, mistakes during construction, bad weather, fluctuation in prices of building materials, inappropriate overall organizational structure linking to the project and labour. The factors above could be observed and could be a clue to preventing delay on construction sites.