For investors, the healthy homes standards are one of the first things to think about when looking at a rental property in New Zealand. They set minimum requirements for rental homes in five areas: heating, insulation, ventilation, moisture ingress and drainage, and draught stopping. A property that falls short will need work, and that work has a price.
Heating means a fixed heater able to warm the main living room to a set temperature, with the required capacity calculated for that specific room.
Insulation rules cover ceilings and, where there is access, underfloor spaces. Existing insulation may need topping up if it is too thin or in poor condition.
Ventilation calls for openable windows in living areas and bedrooms, plus extractor fans in kitchens and bathrooms.
The moisture and drainage standard requires adequate guttering, downpipes and drainage, along with a ground moisture barrier in enclosed subfloors where one can reasonably be installed.
Draught stopping means blocking unreasonable gaps and holes in walls, ceilings, windows, floors and doors, and closing off open fireplaces that are not in use.
Older rentals tend to fall short in predictable places. Some heating types do not qualify under the heating standard at all, including open fires and unflued gas heaters, so a house relying on them may need a heat pump or another acceptable option. Bathrooms without mechanical extraction are common in older stock. Underfloor foil insulation is a particular problem, since it cannot legally be repaired and usually has to be replaced with another product if it is damaged or inadequate.
None of this is necessarily a reason to walk away. A rental that needs insulation, fans and a heat pump may still stack up well once those costs are factored in, and some buyers deliberately target such properties to add value. The point is to know the figures before signing, rather than after the first tenancy review.
Tenancy Services publishes the detailed requirements, together with a tool for working out heating capacity, on its official website. Landlords must also include a healthy homes compliance statement in new tenancy agreements and keep records showing how the property meets each standard.
A pre-purchase building inspection is not the same thing as a healthy homes assessment, but the two overlap in useful ways. Inspectors check the roof space and subfloor, note insulation where it is visible, look over spouting and downpipes, comment on ventilation in wet areas and record dampness or mould. Those findings help an investor estimate what will need upgrading. A dedicated healthy homes assessment can then supply the finer detail, such as heating calculations for the living room.
Records from the current owner are worth requesting. Invoices for insulation, heat pump installation or extractor fans, along with any previous compliance assessments, make it easier to confirm the house is in order and avoid paying for work twice.
Where those records are missing, assumptions get risky. Insulation that looks fine from the hatch can be thin further back, and a heat pump may be undersized for the room it is meant to serve.
Tenanted properties add a practical wrinkle. Access for inspections and assessments has to be arranged with proper notice to the tenants, which can stretch a short condition period.
Costing compliance before making an offer, rather than after, gives a clearer view of whether the rental will deliver the return the numbers promised.