New Zealand – Auckland
Organisation : University of Auckland
Te Pūtahi Tangata – Building 201 [B201] was built in the 1970s as the University of Auckland’s 11 storey former Social Sciences Building, but by the mid-2010s it was no longer fit-for-purpose: a workplace with extensive on-floor partitioning and limited natural light, carbon-based building services systems that were end-of-life, and the structure’s poor earthquake rating meant it was just above the threshold for a Government-issued ‘Earthquake Prone’ notice.
A major adaptive reuse redevelopment saw the original concrete frame retained and strengthened, with a new atrium and additional floors adding 4000m2 to the overall floor area. A new interior fitout, high performance facade (replacing the deteriorating heavy façade that contributed to the low earthquake rating) and renewed building services have extended the building’s life by at least 50 years.
The redevelopment was undertaken from 2021 to 2023 to support the University’s consolidation of activities from the Epsom Campus to the City Campus, and bring together the faculties of Education and Social Work, Arts, and Creative Arts and Industries.
The redeveloped building accommodates teaching, research, staff and social functions, facilities include lecture theatres, an atrium, dance and drama studios, archaeology, wet laboratories, specialist creative spaces, offices, a café and shared student spaces.
This combination of spaces creates a more complex operating profile than the former building as occupancy and operating requirements vary substantially: high-density teaching spaces, faculty offices, a large naturally ventilated public atrium and specialist laboratories requiring continuous environmental control.
An innovative two-stage heat-pump system provides 100% electric heating and cooling to B201, but also to buildings that were serviced from B201 but were not part of the redevelopment. This allowed their existing radiators to become 100% electric, elegantly decarbonising the initial campus heating ‘problem’ that the team faced at the start of the redevelopment.
Following opening in 2023 and the first full academic year of operation from February 2024, B201’s measured energy use was approximately 1,750 MWh, or 66 kWh/m²/year – within 5% of the design target.
The building has achieved a 6 Green Star NZv1.0 Design & As Built rating with 91 points, the highest score awarded by the New Zealand Green Building Council at the time. The NZ Green Building Council describes its 6 Green Star rating as ‘World Leadership’.
The main actions implemented to reduce the energy consumption of this building.
The redevelopment combined major fabric and building services upgrades to reduce energy demand and eliminate on-site fossil fuel use to take advantage of New Zealand’s ~85% renewable electricity.
The building also consolidates multiple academic disciplines and shared teaching, research and social functions in one central-city facility, supporting more efficient use of space and services.
Green Star, New Zealand’s environmental sustainability standard (comparable to BREEAM and LEED), was a key aspect of the design process. The project team had an aspiration for the highest possible Green Star rating of 6 Stars. This required building services systems with exceptional energy efficiency, along with broader aspirational sustainability outcomes.
More than 500 heavy precast façade panels were replaced with a lightweight, airtight curtain wall incorporating high-performance glazing, an optimised glazing-to-wall ratio and targeted shading. This reduced solar gains, heating demand and the capacity required from mechanical systems. Whole-building air permeability testing (not previously attempted at this scale in New Zealand) achieved 6.4 m³/hr/m² against the project target of less than 10 m³/hr/m².
The HVAC design uses active chilled beams in faculty offices, variable air volume systems in high-density teaching spaces and displacement ventilation in the lecture theatres. The atrium uses natural ventilation with automatically controlled windows and underfloor heating rather than full mechanical air conditioning; the smoke extraction fans can be used to provide a boost setting on very rare occasions. These different systems enable the most efficient operation to be achieved.
The main air-handling units have heat recovery and demand-controlled ventilation to smoothly adjust ventilation from outside according to the building’s occupancy, further minimising energy required.
The central plant was fully electrified, with an innovative two stage heat pump arrangement.
· Heating and cooling is provided by 2 x 800 kW air cooled chillers (with desuperheaters for heat recovery) and 3 x 500 kW reverse cycle air-source heat pumps. The heat pumps supply 45°C/39°C water to the redeveloped B201.
· 2 x 300 kW high temperature pumps boost the low temperature water to 80°C/70°C for the adjacent buildings’ radiators and reheat coils. The allowed all 300 radiators and 80 reheat coils in the two buildings to be retained, while fully electrifying their heating.
· A 150 kW afterhours air-cooled chiller is provided to efficiently maintain 24/7 environmental control in the laboratories.
Further investments included LED lighting with smart controls and daylight harvesting, CO₂ heat pumps for domestic hot water production, low-global-warming-potential refrigerants, and approximately 130 kW of rooftop solar photovoltaics. The café’s commercial kitchen has also been made fully electric.
Together, the new façade and efficient building systems have reduced energy consumption by more than 60% compared with the smaller, less intensively used existing facility.
Energy, daylight and climate modelling with whole-of-life cost analysis were used to optimise the façade performance, determine the most efficient HVAC systems and optimise the central plant strategy. The energy targets derived from the energy modelling to set the performance targets for post-occupancy tuning.
The building management system monitors key energy and indoor environmental quality parameters, supported by comprehensive electrical, thermal and water submetering aligned with CIBSE TM39.
Controls include CO₂-based demand-controlled ventilation, heat recovery, variable air and water flow, occupancy scheduling, daylight-linked lighting, and automatic operation of the atrium’s windows, doors and skylights to respond to indoor and outdoor conditions.
Key performance indicators (temperature, CO₂ levels, etc.) are monitored via the BMS and fine-tuned as part of the building tuning process, with the goal of maintaining target setpoints for over 95% of occupied hours.
An independent commissioning agent was engaged from the project’s start to review operability, maintainability, controllability and ease-of-commissioning, as well as coordinate commissioning plans, witness testing and support facilities-team training and handover.
Post-occupancy tuning has continued for two years with quarterly reviews by the project and facilities teams. Comparison of predicted and metered data identified fan and pump energy as higher than modelled. The team has responded by implementing pressure resets based on zone demand, identifying rogue zones, and reducing minimum fan and pump speeds.
This structured monitoring and tuning process has kept first-year energy consumption within 5% of the design target while providing a clear pathway for further improvement.
B201’s operational strategy matches services to actual patterns of use rather than conditioning all spaces uniformly. Demand-controlled ventilation adjusts outdoor air circulation to occupancy, while offices, high-density teaching areas and specialist laboratories have services designed to meet their different levels of use. The naturally ventilated atrium is treated as a transient public space, reducing reliance on energy-intensive air conditioning.
Feature stairs link a significant drop in the campus between the two streets that border B201. In combination with the feature atrium, they have encouraged movement between floors and have contributed to lower-than-expected lift energy use. After-hours conditioning is limited to designated areas. When users requested longer operating hours, occupants are directed to the spaces where after-hours service is provided, with the space serviced by a specific air-handling unit, and the remainder of the building’s services are shut down.
Academic staff received guidance through the Building User Guide, while the facilities team logs comfort issues and uses them to inform tuning. Feedback has also highlighted the importance of clear communication, including around automatic lighting shut off.
Post-handover, the project team continues to meet quarterly to assess system operations, monitor environmental performance, and optimise water and energy efficiency by fine-tuning control settings and schedules.
The 2025 post-occupancy BUS Survey placed the building in the 75th percentile of the New Zealand benchmark overall, and the 72nd percentile for comfort. This is a remarkable transformation compared with the original workplace’s seventh-percentile result. Survey findings, facilities requests and metered data are reviewed together to refine schedules, setpoints and operating practices.
Beyond the measured performance data, B201 has become a highly popular place to work, representing a remarkable transformation from the building's condition prior to its adaptive reuse.
