Healthy Homes Standards: What Landlords Actually Have to Do by Law

If you own a rental property in New Zealand, insulation is not optional and it is not the same rule that applies to a new build or renovation. The Healthy Homes Standards set a specific, legally enforceable minimum for rental properties, and it has applied since 1 July 2019.

Here is what the insulation requirement actually says, who it applies to, and where it fits alongside the wider Healthy Homes Standards.

What the insulation standard requires

Under the Healthy Homes Standards (part of the Residential Tenancies Act), a rental property must have ceiling insulation of at least R2.9, or R3.3 in the country's colder climate zones, and underfloor insulation of at least R1.3, where it is reasonably practicable to install.

Existing insulation also has to meet a basic condition test: it needs to be free of significant gaps, damage or mould, not just present. A thin or degraded layer of old insulation that technically covers the ceiling does not automatically satisfy the standard.

This is a rental-only requirement

It is worth being precise about this, because it trips people up: the Healthy Homes Standards apply specifically to rental properties under the Residential Tenancies Act. There is no equivalent legal minimum forcing an owner-occupier to insulate their own home to the same level.

Separately, Building Code Clause H1 (Energy Efficiency) sets minimum insulation R-values for new builds and major renovations, and those requirements were raised significantly from November 2022. That is a different rule covering different situations, so a landlord bringing an older rental up to standard is working to the Healthy Homes figures above, not the H1 new-build figures.

Insulation is one of five Healthy Homes Standards

Insulation gets the most attention because it is the most expensive to fix, but it is only one of five standards landlords need to meet. The others cover heating, ventilation, moisture ingress and drainage, and draught stopping.

The full detail for each standard, including any exemptions where compliance genuinely is not practicable, is set out by Tenancy Services rather than summarised here, since getting the specifics wrong on a legal compliance matter is worse than not covering it at all.

• Insulation: minimum R-values for ceiling and underfloor, in good condition
• Heating: a fixed heater capable of adequately warming the main living area
• Ventilation: adequate openable windows and extractor fans in wet areas
• Moisture and drainage: ground moisture barriers and effective drainage where needed
• Draught stopping: unreasonable gaps and unused openings sealed

Getting insulation assessed and installed

A landlord bringing a rental up to standard should look for an installer who is a member of IAONZ (the Insulation Association of New Zealand, the genuine industry body for the sector) and whose work follows NZS 4246, the technical standard covering correct installation. Ask for a written Statement of Insulation confirming the R-value fitted, since that is what proves compliance if it is ever questioned.

Eligible homeowners and some landlords may also be able to reduce the cost through EECA's Warmer Kiwi Homes scheme, which funds a share of ceiling and underfloor insulation depending on income and location. Check current eligibility directly at warmerkiwihomes.govt.nz rather than relying on a fixed figure quoted elsewhere, since funding levels can change.

Our researched insulation installer lists are checked against exactly these signals, real IAONZ membership and genuine local service, not just who ranks highest in search.