Allied Sustainability & Environmental Consultants Group Ltd. is an investment holding company, which engages in the provision of environmental consulting services. It operates through the following segments: Green Building Certification Consultancy; Sustainability and Environmental Consultancy; Acoustics, Noise, and Vibration Control and Audio-Visual Design Consultancy; and Environmental, Social, Governance (ESG) Reporting and Consultancy. The Green Building Certification Consultancy segment provides consultancy services on the application of green building certification for new buildings, existing buildings, and building interiors. The Sustainability and Environmental Consultancy segment offers consultancy services that involve the process of environmental impact assessment for compliance with statutory requirements in relation to environmental impact and pollution control. The Acoustics, Noise, and Vibration Control and Audio-Visual Design Consultancy segment includes designs for architectural acoustic, mechanical vibration, noise control, and audio-visual systems. The ESG Reporting and Consultancy segment conducts assessment of the ESG system of clients. The company was founded in 1994 and is headquartered in Hong Kong.