Insulation in rental properties

Insulation is compulsory in all rental homes.

Healthy homes insulation standard

The healthy homes insulation standard requires a minimum standard of ceiling and underfloor insulation in rental properties. There are also requirements for how insulation must be installed.

The healthy homes insulation standard builds on the requirements of the 2016 Regulations. Some properties that meet the 2016 requirements will need to upgrade or replace their existing insulation.

Visit the healthy homes section of our website to find out what you need to do to comply with the insulation standards.

Healthy homes insulation standard

Use our online tool to find out if you are likely to need to upgrade or replace your insulation to meet the healthy homes standard.

Insulation tool

Exemptions to the insulation requirements

Under the Residential Tenancies Act (RTA), certain types of properties are exempt from the requirements.

These 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.

Access exceptions

In many properties the most common way to access the ceiling space or underfloor to retrofit insulation is through an existing trapdoor to the ceiling, or an external door to beneath the house.

Installing insulation is not considered ‘reasonably practicable’ when an experienced professional installer:

cannot access the ceiling or underfloor space without, carrying out substantial building work, or causing substantial damage to the property
cannot install insulation without creating greater health or safety risks to people than is normally acceptable.

Access to the ceiling or underfloor can often be achieved by carrying out minor work. For example, by temporarily removing base boards from the outside of the property to access the underfloor. In this situation the landlord is expected to carry out the work.

Landlords must install insulation in properties where an exception applies if they are carrying out work that would allow insulation to be installed (for example if the property is re-roofed).

Written confirmation of exception

There is no requirement for landlords to consult a professional to establish if an exemption applies. However, we encourage landlords who have doubts about whether insulation can be installed to consult an experienced professional insulation installer and, if needed, a builder.

The experienced professional may advise that it is not reasonably practicable to install insulation. If that happens, the landlord should ask for written confirmation of the reasons to include in tenancy agreements.

Required statements in tenancy agreements

Other grounds for exemption under the RTA

There are other situations where rental properties may not need to meet the RTA insulation requirements.

Where the landlord intends to demolish or substantially rebuild all or part of the property within 12 months of the start of a tenancy. If requested to do so, the landlord must provide evidence that they have applied for the necessary resource consent and/or building consent.
Where a property is purchased from, and immediately rented back to, the former owner-occupier. In this case a 12-month exemption will apply from the date of purchase.
Where the landlord can provide evidence that the insulation is still in reasonable condition, and that the insulation complied with particular insulation requirements when it was installed. There may be specifications in the building consent or an Acceptable Solution or Verification Method under the Building Code.

Examples of complete or partial exemptions

"Bedroom 4 was an extension to the original property and has a skillion ceiling with no roof space to install insulation."
"Installation is not reasonably practicable because the property has a skillion roof throughout and there is not enough space for a professional installer to access the areas to install insulation."
"Insulation information is not provided in the council building file. The ceiling space is also inaccessible and substantial building work would be required to gain access. Specifically, in order to access the ceiling space, the roof would need to be lifted. The landlord confirms that all reasonable steps have been taken to find this information."
"The property is built on a concrete slab; therefore there is no suspended floor area in which to install insulation."
"Insulation information is not available in the council building file. The underfloor space is also too narrow for a professional assessor to gain access and provide an assessment. The landlord confirms that all reasonable steps have been taken to find this information."