Daylight simulation for code compliance: creating a decision tool

The minimum illuminance requirement for New Zealand Building Code (NZBC) Clause G7 – Natural Light is currently not being met in some new apartments. Daylight simulation is the most effective method of predicting the performance of daylight in apartments, but due to the complexity and time required to gain accurate results, these simulations are not routinely done. This paper discusses an investigation into whether a tool could be created that will identify when daylight simulations may be required to prove compliance with NZBC G7. A tool was created by simulating the effects of various building design and environmental factors on the illuminance levels in a set of hypothetical apartments. Calibration tests were carried out for three typical apartments in Wellington. This research demonstrated that a tool can be created that determines when apartment buildings may required daylight simulations as proof of compliance with NZBC G7.