R-value vs. thickness
The legal measure for insulation is the R-value, which measures how well a material resists heat flow. While “thickness” (e.g., 120mm) is often used as a guide, it is the R-value that determines compliance.Climate zones and requirements
New Zealand is divided into three climate zones for the Healthy Homes Standards. You must meet the R-value required for your specific zone.What landlords must provide
Landlords must ensure that insulation is installed in all “reasonable” areas of the home.- Ceilings: Must be covered entirely, except where access is impossible or where safety clearances are required (e.g., around old recessed lights).
- Underfloor: Any suspended floor with a crawl space must have insulation installed.
- Condition: Insulation must be in “reasonable condition.” If it is damp, mouldy, compressed, or has large gaps, it must be replaced or topped up.
What tenants can do
While you cannot install structural insulation yourself, you can significantly improve your home’s warmth:- Thermal curtains: Use heavy, floor-length curtains to create an air seal over windows.
- Report issues: If you see insulation that is falling down under the floor or notice cold spots in the ceiling, tell your landlord immediately.
Finding support
If you are a homeowner or a tenant concerned about your home’s insulation, the Warmer Kiwi Homes programme provides grants covering 80–90% of the cost for eligible households.Check if you are eligible for an insulation grant at Warmer Kiwi Homes.