Development is an effort to create prosperity and the welfare of the people. The stages of development work sometimes experience obstacles, both from human factors and other resources. Problems that can occur during the implementation of development work are the potential for disputes, disputes of opinion, differences in understanding, or quarrels between parties involved in construction agreements which will result in default. The method in this research is to use the normative juridical method. The normative juridical method is carried out through literature studies that examine mainly secondary data in the form of laws and regulations, court decisions, agreements, contracts, or other legal documents, as well as research results, study results, and other references. The result of this research is the default by CV. Mustika Karya Pratama is not carrying out achievements in the form of payment terms so that PT. Serayu Putra Persada came to the office of CV. Mustika Karya Pratama to confirm about the continuation of bill payment for hot mix work items. With this problem, it is hoped that the parties involved in this work will comply with and understand the legal regulations that have been established.Keywords: Development, Agreement, Default