What's the definition of deep retrofit?
A deep retrofit refers to a comprehensive renovation of an existing building aimed at dramatically improving its energy performance, typically targeting reductions in energy use of 50% or more compared to the building's pre-retrofit baseline (some definitions set the bar even higher, around 70-90%, especially for net-zero-ready outcomes).
Retrofitting Aotearoa: Why New Zealand's Existing Buildings Are Key to Net Zero by 2050
New Zealand has legislated a target of net zero carbon emissions by 2050, and its building stock is central to reaching it. The building and construction sector currently produces around 20% of New Zealand's emissions, much of it embodied in existing structures that will remain in use for decades to come.