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 & Environmental Consultancy; Acoustics, Noise, and Vibration Control & Audio-Visual Design Consultancy; and Environmental, Social, Governance (ESG) Reporting & 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 & Environmental Consultancy segment offers consultancy services that involves the process of environmental impact assessment to identify, predict, evaluate, and mitigate the biophysical, social, and other relevant effects of property development proposal prior to major decisions being taken and commitments made. The Acoustics, Noise, and Vibration Control & Audio-Visual Design Consultancy segment includes architectural acoustic design; sound insulation design; mechanical, electrical, and plumbing services noise and vibration control; design and construction supervision of acoustic treatment and noise mitigation design; and audio-visual design. The ESG Reporting & Consultancy segment conducts assessment of the ESG system of clients. The company was founded in 1994 and is headquartered in Hong Kong.