Good design is central to the achievement of quality buildings that satisfy client requirements, yet all too often defects and failures that occur after occupation can be shown to have their origin in design deficiencies. The aim of "Design Checks for Public Health Engineering" is to improve the quality control and performance of the technical design process. Design guidance sheets provide information on design inputs, outputs and practical watch points for key building services design topics. They will help to reduce the risk of design errors and omissions and improve the overall efficiency of the design process. The guide complements CIBSE Guide G, Public Health Engineering and can be easily incorporated into a company's quality assurance systems to become part of the daily routine of design.