Wet Wipes, Metal in the Microwave, a Jammed Disposal: Who Pays When It's Carelessness, Not Wear and Tear

My first reaction, when something breaks because of a tenant's carelessness, is frustration, not sympathy. It is my money paying for someone else's mistake with a wet wipe or a fork in the wrong place. But that reaction only tells half the story. For me a blocked toilet or a dead microwave is an expense, annoying, but ultimately a number I can absorb and move past. For the tenant sitting in a flat with no working toilet or no way to cook dinner, it is not an expense at all, it is their evening, their kids' bedtime routine, their ability to function in their own home right now. Both things are real at the same time, and neither cancels the other out. The law does not ask a landlord to forgive the cost, and it does not ask a tenant to pretend the disruption did not happen. It draws a line for who eventually pays, and that line is worth knowing precisely, because most of what plays out in the meantime is not an argument about liability, it is someone living without a working toilet while that argument gets sorted.

Most landlord guidance draws one line: fair wear and tear is the landlord's cost, damage is the tenant's. That is not quite right, and the gap between those two categories is exactly where the frustrating calls land. A blocked toilet from flushed wipes, a garbage disposal jammed by something metal, a microwave that arced because someone put a fork in it. None of that is wear and tear. None of it is necessarily vandalism either. It sits in a middle category the law actually names: careless damage, and it comes with its own specific rule.

The Three Tiers, Not Two

Tenancy Services sets out the underlying framework on its damage and repairs page, though the three-tier version below is the practical way to actually apply it:

• Fair wear and tear. Gradual deterioration from ordinary use over time. Never chargeable to the tenant, regardless of cost. This is the cost of owning a rental property.
• Careless damage. Damage caused by an accident, carelessness, or negligence, something the tenant did not intend but should reasonably have avoided. The tenant is liable, but only up to a cap: four weeks' rent, or your insurance excess if the damage is claimed on your landlord insurance, whichever is lower.
• Intentional or reckless damage. Deliberate damage, or an act so obviously dangerous that it goes beyond carelessness. No cap. The tenant is liable for the full cost.

Almost every "who pays for this" question a landlord actually has lives in the careless-damage tier, capped, but still chargeable, which is often not what either side assumes going in. For the fuller mechanics of the cap itself, including how it interacts with a real insurance claim, see the deeper breakdown here. This piece is about how that rule actually plays out for the specific things you get called about.

Wet Wipes and a Blocked Toilet

This is close to a textbook careless-damage case, and it has already been tested. In 2022 the NZ Herald reported a Tenancy Tribunal case where a tenant was ordered to pay $1,216.83 from her bond after flushed wet wipes clogged and destroyed the rental's water pump. Wet wipes, regardless of what the packaging says, do not break down like toilet paper, and "do not flush" is common enough knowledge that a landlord has a reasonable case that flushing them is carelessness, not an innocent accident with no reasonable warning.

What this means in practice: get an invoice from the plumber that specifically identifies wet wipes (or whatever the actual blockage was) as the cause, not merely "cleared blockage." That documentation is what turns "I think it was probably them" into a chargeable, defensible claim, whether you are deducting from bond, invoicing directly, or it ends up in front of the Tribunal.

Garbage Disposal: Metal, Onion Skins, and What Actually Counts

A garbage disposal jammed or burned out by something metal dropped in by accident is careless damage in the same way. A tenant running it dry, or putting something the manufacturer's instructions specifically warn against down it (onion skins are a common one, since the fibrous layers wrap around the blades and jam the motor), is harder to call an innocent accident once you can point to an instruction they did not follow.

Where this gets murkier is a disposal unit failing from ordinary daily use with no clear single cause. If nobody can point to a specific act, that tips back toward wear and tear or at least reasonable doubt, and that doubt tends to run in the tenant's favour at the Tribunal. The distinction that matters is not "it broke while they had it," it is "can you point to what they did."

Metal in the Microwave

This is the example worth pausing on, because it sits closer to the line between careless and reckless than the others. Putting metal in a microwave is widely known to cause arcing, and can start a fire or damage the unit. That general awareness is exactly what could push a specific incident from "careless" into "reckless", an act where the danger was obvious enough that a reasonable person should have known better, which under the RTA can mean no cap on liability at all rather than the four-week ceiling. Whether a specific incident actually crosses that line is a fact question for the Tribunal to weigh, not something a guide like this can settle in the abstract, but it is worth knowing the distinction exists before you assume every appliance mishap is automatically capped at four weeks' rent.

Light Bulbs and Smoke Alarm Batteries Are Not Damage at All

A burnt-out bulb does not belong in the careless-damage framework at all, because it is not damage, it is a consumable reaching the end of its life. The Residential Tenancies Act does not actually say who is responsible for it, but the settled convention, backed by Tenancy Tribunal decisions on the point, is that a landlord supplies working bulbs at the start of the tenancy and the tenant replaces standard, easily-accessible bulbs during it, the same way a tenant buys their own toilet paper. Treat that as ordinary day-to-day tenant upkeep, not something to invoice or issue a notice-to-remedy over.

The one carve-out worth knowing: a sealed or integrated LED light unit that needs an electrician or specialist tools to access is not a "light bulb" in the sense that convention covers. If replacing it means actual electrical work rather than a simple twist-and-swap, that is on you as landlord, the same as any other fixture.

Smoke alarm batteries follow a similar shape, not the opposite one. Per Tenancy Services, a landlord must ensure a smoke alarm is installed and working at the start of the tenancy, and remains in working order overall. A tenant must replace dead batteries during the tenancy for older-style smoke alarms with replaceable batteries, and must tell the landlord as soon as there is a problem. In practice this rarely comes up on newer installs, since smoke alarms fitted since mid-2016 must be long-life photoelectric alarms with at least an eight-year battery, or hard-wired, so there is often no battery to change at all during a normal tenancy.

An apartment or unit-title property can be different again. Many buildings have a centrally monitored fire system installed and maintained by the body corporate, wired into the building's own detection and evacuation setup rather than standalone battery units in each unit. Where that is the case, there is nothing for either the landlord or the tenant to check or replace, the building's own annual fire safety inspection covers it, and the individual-unit battery convention above does not apply. Confirm which situation your property is actually in before assuming either rule.

What Actually Protects You

None of this works from memory. If you want to recover a careless-damage cost, whether from bond or by invoicing directly, you need three things: a dated photo or note of the condition before the tenancy (or from the last inspection) showing it was fine, an itemised invoice from whoever fixed it that states the specific cause, not only the fix, and a record of when the tenant reported it or when you found it. Without that chain, "careless damage" is your word against theirs, and doubt tends to resolve in the tenant's favour.

Common questions

What's the difference between fair wear and tear, careless damage, and intentional damage?

Fair wear and tear is gradual deterioration from ordinary use and is never chargeable to the tenant, regardless of cost. Careless damage is an accident or negligence the tenant should reasonably have avoided, and is chargeable up to a cap. Intentional or reckless damage is deliberate or obviously dangerous, and has no cap at all.

Is there a cap on what a tenant can be charged for careless damage?

Yes. Careless damage is capped at four weeks' rent, or the landlord's insurance excess if the damage is claimed on landlord insurance, whichever is lower. That cap only applies to careless damage - intentional or reckless damage has no cap, and the tenant is liable for the full cost.

What evidence do I need to actually recover a careless-damage cost?

Three things: a dated photo or note of the condition before the tenancy (or from the last inspection) showing it was fine, an itemised invoice from whoever fixed it that states the specific cause, not only the fix, and a record of when the tenant reported it or when you found it. Without that chain, careless damage is your word against theirs, and doubt tends to resolve in the tenant's favour.

RentManager keeps maintenance requests, inspection photos, and tradesperson invoices attached to the property with a date, so if a bond deduction or a Tribunal claim ever needs to show exactly what happened and when, the evidence is already there rather than scattered across texts and email.