Globally speaking, the problem of delay in all kind of engineering construction is a very common difficulty causing several unwonted results to all participants concerned. A literature review was directed to compose a list of delay factors. The resulting list of delay factors was subjected to a questionnaire survey for quantitative confirmation and identification of the most frequent causes of delay in Yogyakarta City. The overall results indicated that the most important causes are: Shortage of Labor supply, Poor selection of subcontractors, Shortage of Technical professionals with the contractor, Slow preparation and approval of shop drawings, Shortage/Availability, Quality assurance/Control, Obtaining permits from Government, Unrealistic time estimation, Conflicts in work schedules of subcontractors, Delay in work approval. And construction delay doesn’t really affect the productivity of Yogyakarta construction companies. And finally, the qualities of their product are proven that remain the same, even any delays are happening.