How is JV3 Assessed?

This process involves the comparison of a proposed design with a Deemed-to-Satisfy (DtS) reference building whilst also taking into account the specific location and weather data of the proposed building. The proposed building must not exceed the annual energy consumption of the DtS building, this allowing much more flexibility when designing, with building elements being able to be chosen as long as the sum of the whole building does not exceed the maximum annual consumption. The JV3 alternative assessment can be used to attain certain flexibility when designing, such as glazed elements (e.g. the amount, orientation and quality), the building fabric (e.g. the envelope, facades, floors, walls, and roof) and when planning the services (e.g. air conditioning, lighting and heating) as opposed to just a DtS Section J report.

JV3 Verification Method

The proposed building's annual energy consumption is not to be greater than the annual energy consumption allowance.

The subject building's annual energy consumption is assessed in:

  • MJ/m² per annum or
  • kWh/m² per annum

The energy consumption is compared with a reference building's theoretical annual energy consumption. The reference building assumes that it complies with the Deemed-to-Satisfy (DtS) requirements.

Steps in using the JV3 Verification Method

  1. Determine the consumption of annual energy allowance by using a reference building with DtS provisions to model the criteria in JV3.
  2. Calculate the theoretical amount of annual energy consumption of the proposed Performance Solution through the building criteria of the subject or the criteria in Specification JV.
  3. Calculate the theoretical amount of annual energy consumption of the proposed Performance Solution by modelling the services with that of the reference building.
  4. Compare the output of steps 2 and 3 (theoretical annual energy consumption) to the output of step 1 (annual energy consumption allowance). This ensures that the annual energy consumption is not greater than the allowance.

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Related JV3 Pages:

JV3 Requirements
What is JV3?
When is JV3 Required?