Yau Lee Holdings Limited, an investment holding company, engages in the construction business primarily in Hong Kong, Macau, Singapore, and Mainland China. The company operates through Construction, Electrical and Mechanical Installation, Building Materials Supply, Property Investment and Development, and Hotel Operations segments. It contracts for building construction, plumbing, renovation, maintenance and fitting-out projects, and electrical and mechanical installation. The company also provides architectural and engineering, theme painting, curtain wall and steel work, engineering, plumbing and drainage services. In addition, it offers software development, project management and consultancy, and system development services. Further, the company trades in construction and building materials; and invests in, develops, and operates properties. Additionally, it offers building information modeling, and other virtual design and construction; electrical, mechanical, ventilation and air conditioning, fire, plumbing, and environmental engineering; energy optimization and environmental protection; water treatment; hotel management; patent licensing; and training services. The company is also involved in the design, installation, maintenance, renovation, and fitting-out of buildings; environmental protection related software and programming activities; manufacture and sale of precast products and building materials; distribution of books; provision of welding services for pipes and fillings, and lift repair and maintenance services; and trading of environmental technology products. Yau Lee Holdings Limited was founded in 1958 and is headquartered in Kowloon Bay, Hong Kong.