Insulation R-values: everything you need to know (2025)

Insulation's R-value measures its ability to resist heat flow—a higher value means better performance, keeping your home warmer in winter and cooler in summer.

New Zealand's Building Code sets minimum R-value requirements for new builds and extensions, which vary across six distinct climate zones. These standards ensure homes are healthy and energy-efficient.

While an upfront investment, installing quality insulation that meets or exceeds these codes can lead to significant long-term savings on your energy bills.