Problems of theft and vandalism is paramount issues related to building sites. The incidence of theft and vandalism sometimes depend on the nature of construction work and these vary among housing developments, roads and highways construction, dam structures, airport, and stadia construction. This study investigates the nature of theft & vandalism and security control on building site to curb the endemic effect through diversity of security technologies. A purposive sampling technique was adopted for the study. Opinion survey questionnaires were administered to construction professionals in the three categories of construction firms; large construction, medium construction and small construction firms and literature was also reviewed. The data collected was analysed using both descriptive and inferential statistics. Study revealed that more theft and vandalism are experienced large construction firms than medium and small firms. Construction professionals agree to identify causes of losses and considered all security component/ measures to be important.