Healthy Homes Standards Frequently Asked Questions
Private rental properties must have ceiling and underfloor insulation that meets the 2008 Building Code or has a minimum R-value of:
-
Ceiling insulation: R 2.9 (Zone 1 & 2), R 3.3 (Zone 3)
-
Underfloor insulation: R 1.3 (all zones)
Minimum R-values vary across New Zealand. You can use the map on Tenancy Services website to check what zone your property is in (tenancy.govt.nz). Common insulation materials include:
-
Glass wool (Pink Batts or Earthwool) – Affordable and widely used.
-
Polyester insulation – Made from recycled plastic, non-irritant.
-
Polystyrene insulation – Often used for underfloor insulation.
- Wool Insulation – Natural, moisture-resistant, and eco-friendly, suitable for both ceiling and underfloor insulation.
Insulation must be in good condition, with no gaps, dampness, or damage. If existing insulation was installed before 1 July 2016, it must be at least 120mm thick and in reasonable condition to remain compliant. An insulation expert can recommend the best option for your property.