Allied Sustainability and Environmental Consultants Group Limited, an investment holding company, provides green building and environmental consulting services in Hong Kong, the People’s Republic of China, and Macau. It operates through four segments: Green Building Certification Consultancy; Sustainability and Environmental Consultancy; Acoustic, Noise and Vibration Control, and Audio-Visual Design Consultancy; and ESG Reporting and Consultancy. The company offers green building certification consultancy services for property developers, contractors, architects, designers, and government departments; and sustainable design solutions to architects for urban regeneration, sustainable development, and integrated planning, as well as environmental impact assessment, noise impact assessment, air quality impact assessment, air ventilation assessment, carbon/energy audit, and built environmental study services. It also provides services to assist architects and engineers to test and evaluate environmental performance of various materials and products for buildings; and architectural acoustics, building acoustics, mechanical service and airborne noise control products, sound reinforcement and public address systems, and architectural and facade lighting systems, as well as theatre planning and stage equipment systems.