The collapse of multi-store buildings in Nairobi City County has increased with an equal escalation in construction of residential buildings. The purpose of this book was to assess the effect of residential buildings compliance practices on performance of the National Construction Authority projects in Nairobi City County, Kenya. This research used descriptive research design. The target population was all the 403 top, middle and lower level staff currently working in the various departments within the institution, which is in charge of currently over 1,011 projects. The sample size of this study was 81. The study recommends that the management at NCA continue with the motive of establishing many more building code compliance practices in Nairobi city for the essence of their efficiency. The NCA managers and stakeholders responsible for operational building standardization practice and occupational ethics compliance practice take it as an initiative to educate their esteemed clients in the construction industry on the usage of best compliance practices.