Procurement delay in construction projects is considered as one of the most recurring problem in health sector in Sri Lanka. Delay in procurement has adverse effects on project success in terms of cost, time and quality. Authority and the accountability of construction works in almost all health institutions in the district are vested with respective Regional Directorate of Health Services (RDHS).This study was aimed at identifying factors affecting timeliness of procurement of Works identified in annual plan of RDHS Gampaha. The Method consisted of qualitative interviews with relevant staff and experts in the field and desk reviewing of files related procurement of works (n= 124) in the RDHS. Study concluded that most of the steps of procurement of works were delayed at RDHS Gampaha. Statistically significant delay was noted in relation to designing and estimation as one of the major factors of all categories of works when compared with National Procurement Guideline. Lack of technical feasibility study of projects, poor budgeting, late initiation of procurement process, unavailability of a procurement plan and PTS, poor Coordination among main stake holders were identified as a factor affecting the timeliness of construction procurement.