Landlord pest control obligations in New Zealand

The general principle

New Zealand tenancy law doesn't set out a pest-by-pest rulebook. It works from a broader duty: the landlord must provide the premises in a reasonable state of cleanliness and maintain them in a reasonable state of repair, and the tenant must keep the property reasonably clean and tidy and not damage it.

Applied to pests, that generally means an infestation arising from the building itself is the landlord's, and one arising from how the property is being used is the tenant's. Most disputes are really arguments about which of those it is.

Usually the landlord's responsibility

• An infestation that was present when the tenancy started
• Rodents entering through gaps, holes or damage in the building fabric
• Borer in the structural timber
• Wasp or bird nests in the roof, walls or eaves
• Problems stemming from a damp subfloor, blocked guttering or failed ventilation

Usually the tenant's responsibility

• Fleas brought in by the tenant's pets
• Bed bugs brought in on luggage or second-hand furniture
• Infestations caused by food waste, rubbish or poor hygiene during the tenancy

Where it gets genuinely unclear

Plenty of cases don't fall neatly either way. Cockroaches in a multi-unit building can migrate from a neighbouring flat regardless of what either tenant does. Fleas can arrive with rodents rather than pets - a common pattern, and one that shifts responsibility, because the rodents are usually a building issue.

Where cause is disputed, an inspection that identifies the entry point or source is worth more than an argument. We put what we find in writing, which is often what settles it.

Practical advice for landlords

Treat pest issues at changeover rather than mid-tenancy where you can - the property is empty, access is easy, and it establishes the condition at the start of the next tenancy, which is exactly the fact that matters if a dispute comes up later.

Keep the record. A dated report saying what was found and what was done is the difference between a clear position and a he-said-she-said at the Tenancy Tribunal.