Insulation Standard for New Zealand Homes

Since 1 July 2019, ceiling and underfloor insulation have been compulsory in all rental property and homes. These apply to rental homes that are practicable to install and all rental properties covered by the Residential Tenancies Act including Kāinga Ora (formerly Housing New Zealand) and registered Community Housing Providers.

Due to some property design or construction, it may not be reasonably practicable to insulate. These types of properties are: apartments where there is a habitable space above and below the apartment, houses built on concrete slabs, houses with skillion roofs where there is no ceiling space to install insulation.

Insulation must be installed safely and meet the correct standards. Landlords who don’t have the correct insulation installed, and don’t meet the criteria for an exception, are in breach of the Residential Tenancies Act and may be liable for damages of up to $4,000.

Insulation is measured by R-value. R-values are a measure of resistance to heat flow. The higher the R-value, the better the insulation.

2016 Insulation Requirements


Insulation requirements BEFORE July 2016

Insulation that was installed before July 2016 will meet the current requirements if:

  • it is in reasonable condition (e.g. no mould, dampness or gaps), and
  • it was at least the minimum R-value when it was installed.

Insulation requirements AFTER 1 July 2016

New insulation in rental properties needs to meet minimum R-values and must be in reasonable condition. The minimum R-value depends on which part of the country the property is in:Inl
Insulation standard zone in Nz

Landlords must make all reasonable efforts to find out what insulation is in their rental property. They can assess this by:

  • physically looking in the ceiling cavity and underfloor area
  • hiring a professional to do an assessment
  • checking the council building file

If you’re not sure of the location, type and condition of the insulation, seek advice from a professional insulation installer or give us a call at Heat Pumps Direct for further information before you install heat pumps into your home.

Get in touch with us to learn more about insulation standards for your home