Buying guide
Insulation R-values: everything you need to know (2025)
Understand New Zealand’s minimum standards
AI summary
Understanding insulation R-values is crucial for an energy-efficient home. The R-value measures a material's resistance to heat flow—a higher value means better performance.
The New Zealand building code mandates minimum R-values for new builds and extensions. These requirements vary across six climate zones and for different parts of the house, like the roof and walls.
While an upfront cost, investing in quality insulation provides significant long-term savings on your heating and cooling bills.
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What are insulation R-values?
Insulation requirements in NZ
New Zealand’s six climate zones:
Source - NZ government building perfromance
NZ insulation requirements by climate zone
Source - NZ government building perfromance
How do insulation requirements in NZ affect you?
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