NZ Insulation Requirements (H1 2023)
The NZ Building Code clause H1 (Energy Efficiency) was significantly updated in 2023, raising minimum R-values across all climate zones. All new builds and major renovations must comply.
NZ Climate Zones
| Zone | Cities | Min ceiling R-value |
|---|---|---|
| 1 | Northland, Auckland | R 6.6 |
| 2 | Waikato, BOP, Gisborne | R 6.6 |
| 3 | Hawke's Bay, Wellington, Taranaki | R 4.0 |
| 4 | Nelson, Marlborough, West Coast | R 4.0 |
| 5 | Canterbury, Otago | R 3.3 |
| 6 | Southland, Fiordland | R 3.3 |
Insulation Grants
Check if you qualify for Warmer Kiwi Homes grants — eligible homeowners can receive up to 66% subsidy on insulation installation. Visit EECA Energywise for details.
Typical Installed Costs
- Ceiling insulation: $18–$30/m² installed
- Underfloor insulation: $20–$28/m² installed
- Wall insulation (new build): $25–$40/m² installed