Marshall Day Acoustics
Architecture and PlanningAuckland, New Zealand51-200 Employees
Marshall Day Acoustics is a specialist acoustics consultancy that addresses noise and vibration across diverse projects, from intricate performing arts venues to large-scale civic and commercial developments and transportation infrastructure. The firm combines traditional environmental, building, and room acoustics with more technical areas such as vibration, marine and underwater acoustics, and sound insulation theory and data acquisition. Its advisory work is delivered in varied forms, including reports, design guidance, peer reviews, expert evidence, seminars, stakeholder consultation, policy development, and virtual reality simulations. Headquartered in Auckland, New Zealand, the company traces its origins to 1981 when Sir Harold Marshall and Christopher Day founded it, with an Australian arm established in 1987 by Peter Fearnside; it has operated as entirely employee-owned for more than a quarter-century. Positioned as one of the world's leading acoustic consultancies within the architecture and planning sector, it serves clients across New Zealand and Australia and develops design tools that are used globally by researchers, consultants, designers, and manufacturers. In 2025 the firm expanded its offices to Australia and the United Kingdom, and the Auckland team moved to a new Level 5 office at 2 Commerce Street.
1-888-653-2347 
support@leadiq.com 
