Book updated May 2022. In Massachusetts, the building code requires that construction of all one and two family dwellings of any size and all other types of buildings containing less than 35,000 cubic feet of enclosed space must be performed under the supervision of a Construction Supervisor licensed by the State Board of Building Regulations and Standards. There are several different specialties. The restricted license is for one and two family residential buildings ONLY, while the unrestricted license is okay for buildings up to 35000 cubic feet in size. They both require solid foundation knowledge on building structures, materials and safety procedures.Our study notes focuses on the relevant structural concepts, building material and safety procedures which are covered by both the Unrestricted CSL exam and the Restricted CSL exam. This ExamFOCUS book focuses on the more difficult topics that will likely make a difference in exam results. The book is NOT intended to guide you through every single official topic. You should therefore use this book together with other reference books for the best possible preparation outcome.