The paper describes the concept of quality and quality management system in organizations and projects. The specificity of quality management in construction is explained. The quality management system includes extensive documentation, which in construction organizations is divided into general, which is applicable to all activities, and specific documentation, which is adapted to each individual project. The law does not prescribe the obligation to operate according to the quality system, but the modern market is increasingly imposing on organizations the need to introduce a quality system. There are several quality systems, the most famous being the ISO system, which consists of the ISO 9000 series of standards and is described in more detail in this paper. The quality management system requires certain documents and records that enable proper quality management in the organization and projects. This paper briefly describes these documents and the requirements set by HRN EN ISO 9001. The standard HRN ISO 10005 was also analyzed, which contains instructions and guidelines for the development of a quality plan. The legislative framework covering construction projects was also analyzed. Unlike the quality plan, the law prescribes the development of a quality control and assurance program, which is an integral part of the project documentation. A comparison of the legally prescribed quality control and assurance program and the quality plan according to the ISO system was made.