JV3 is a Verification Method in NCC Volume One for the energy efficiency of the building fabric and its services.  JV3 is the alternative assessment method for non-residential buildings, which uses a reference building to compare the overall assumed energy consumption of new buildings with respect to their location and climate.  This applies when a building’s complex design does not meet the Deemed To Satisfy (DTS) requirements under the National Construction Code (NCC).  JV3 allows much more flexibility with regards to design choices, as architects and designers can create as they see fit as long as it does not exceed the reference buildings energy usage targets.  JV3 is much like a non-residential equivalent of NatHERS modelling, allowing flexibility to choose glazing and building elements as long as it stays within the annual energy consumption of the Deemed To Satisfy (DTS) building.  JV3 is a Verification Method in NCC Volume One for the energy efficiency of the building fabric and its services.