One of the problems in working on construction projects is the occurrence of waste. One of them is a road project. The occurrence of waste in road projects is closely related to construction work methods, human resources, sorting and reuse processes. In connection with this potential waste, contractors must have a strategy to minimize this occurrence, because it can result in losses to the project and environmental sustainability. The aim of this research is to identify the dominant factors and causes of waste in road construction projects in Kuantan Singingi Regency, Riau. Next, provide solutions to overcome the occurrence of waste in road construction projects in Kuantan Singingi Regency, Riau. This study uses a quantitative method by distributing questionnaires to respondents and the results of respondents' answers are tested for assumptions, validity, reliability and factor analysis. Based on the identification results, the factors that cause waste in road construction projects are obtained, namely skill and supervision factors, work discipline factors, technical factors, equipment factors and information factors. Based on the analysis, the dominant factor causing waste in road construction projects in Kuantan Singingi Regency, Riau, is the skill and supervision factor with an extraction percentage value of 28.181% which consists of the variables of lack of workforce skills, late supervision, lack of foremen, and lack of complete contract documents. The solution to overcome the occurrence of waste in road construction projects is to maintain and maintain the implementation of supervision and assign personnel who have competence or experienced skills.