The cost was the basis for management in determining the selling price of a product or service. In construction service companies, the cost determining is important. It will affect the value of the tender proposal submitted to get the job. CV. RG is a construction service company provides services in the civil and building fields. CV. RG, of course, has often participated in tenders. The problem is the company often suffer losses. The company’s success rate is still relatively low. The company participates in a tender, costs, and efforts arise in preparing the tender. In conducting costing, there are at least two aspects must be considered. It is namely the cost component and cost magnitude. This study uses a phenomenological approach to gain an understanding of decision holders about a reality based on experience. The interpretative phenomenology method is suitable to be used due to the researcher wants to reveal and understand how the decision holders. CV. RG means cost component and cost magnitude is in the process of price-determining the tender proposal. The results of the research analysis showed that in determining the cost component. The informant felt complicated due to the situation at hand. The dilemma feelings also accompanied the informants in determining the cost magnitude of the tender proposal. The meaning of this informant can also be explained because of motives and in order to motives that underlie the informant actions.