The aim of this study was to estimate potential environmental impacts associated with adopting energy efficiency refurbishments on the existing office building stock in New Zealand. Additionally, a second objective was to identify the potential contribution of the office building stock in relation to New Zealand’s 2050 climate change mitigation target. For this purpose, the study used Life Cycle Assessment in conjunction with stock aggregation modelling. The impacts of the building stock were calculated for non- refurbished building stock; refurbished building stock; refurbished building stock adopting resource and waste management measures and; refurbished building stock installed with photovoltaic panels. The results highlight the achievability of New Zealand’s 2050 target in the office-building sector with a potential to reduce 40–98 % CO₂ eq. emissions. Use of photovoltaic substantially increases the resource demand of refurbished buildings. Prioritizing the refurbishment of the building stock by adopting efficient resource use and waste management measures can contribute to reductions in greenhouse gas emissions without increasing environmental pressures from resource demand. Moreover, prioritizing refurbishment activities in major cities and/or in large buildings can be an effective measure to achieve 2050 target but not at the cost of increasing other environmental impacts.

这项研究的目的是评估与对新西兰现有办公楼存量进行能效翻新相关的潜在环境影响。此外，第二个目标是确定办公楼库存对新西兰2050年减缓气候变化目标的潜在贡献。为此，该研究将生命周期评估与库存聚集建模结合使用。针对未翻新的建筑存量计算了建筑存量的影响；翻新的建筑库存；采取资源和废物管理措施翻新建筑库存；以及 翻新的安装有光伏板的建筑材料。结果凸显了新西兰在办公建筑领域实现2050年目标的潜力，并有可能减少40％至98％的二氧化碳₂当量 排放。光伏的使用大大增加了翻新建筑物的资源需求。通过采用有效的资源利用和废物管理措施来优先进行房屋建筑的翻新，可有助于减少温室气体的排放，而又不会增加资源需求带来的环境压力。此外，在主要城市和/或大型建筑物中优先进行翻新活动可以是实现2050年目标的有效措施，但不能以增加其他环境影响为代价。