The next edition of the National Construction Code proposes amendments. These amendments focus on the requirements for energy efficiency of commercial buildings. It includes waterproofing of balconies, car parks, storage and warehouses. Additionally, it focuses on condensation management. If approved, these changes will affect construction costs for houses and apartments. They will also impact construction techniques and the acceptability of standard building materials.
What are the major changes being proposed for commercial Class 3 & 5-9 buildings?
Significant energy efficiency stringency increases for Commercial building Class 3, 5-9 buildings are a focus of the 2025 amendment. These include:
– Air-conditioning system efficiency, and ducting length restrictions
– Requirements for building sealing
– Insulation
– Solar remittance and solar reflectance of roof materials in place of solar absorptance
– Glazing
– Space heating
– Artificial lighting demand control
– Pump and fan efficiency
– Energy efficiency modeling verification techniques have changed. These methods now align with stringency increases for elemental provisions.
Electrification is a focus of the proposals, which will need:
– That physical space and spare electrical capacity be provided for equivalent electrical appliances in future where gas appliances are installed.
– Provision for future battery installations.
– Varying levels of Solar Photovoltaic arrays (or equivalent) based on climate zone, class, floor area and presence of gas appliances.
– Electric vehicle charging equipment quantified to be enough for 20% of the daily driving needs. This applies to all occupants of a Class 3, Class 5-9 building..
– Increased fire safety for car parks (including open deck car parks) to mitigate fire risks linked to modern vehicles and car stackers.
NZEB Energy Rating 