Renting Out a Garage or Sleepout in NZ: The $5,700 Legal Risk

The short version: a Christchurch landlord who rented his garage to a workmate "as a favour" has just been ordered by the Tenancy Tribunal to pay $5,775 - more than the roughly $5,250-$5,400 in rent he collected over the eight months the arrangement ran. Renting out a garage, sleepout, converted shed, or granny flat as a separate home is unlawful in New Zealand unless that space has council consent for residential use, full stop - and it does not matter that the tenant knew that and agreed to live there anyway. The Tenancy Tribunal has full jurisdiction over unlawful residential premises, and a landlord who rents one out is exposed to a rent refund, compensation, and exemplary damages, on top of losing the unpaid-rent arguments they might otherwise have won.

I read the case because it's exactly the scenario a lot of self-managing landlords in NZ genuinely don't think through: someone at work needs somewhere to stay in a rental market with a real housing shortage, you've got a spare garage, sleepout, or granny flat sitting empty, and it feels like you're helping. Under the Residential Tenancies Act 1986, "helping" someone into an unconsented space is still a breach with real financial consequences, regardless of your intentions.

What Actually Happened in the Christchurch Garage Case?

According to the Tenancy Tribunal decision reported by RNZ and originally published in the NZ Herald, landlord Regie Caballero rented his garage to a workmate after meeting him at work. Caballero said the tenant had "begged him" for somewhere to stay after the landlord and his wife had already rented a room in their own house to another couple. The tenant moved into the garage in September 2025 for $150 a week, including Wi-Fi and electricity. The garage had no kitchen or bathroom - the tenant used an induction cooker and the landlord's own toilet and shower.

Caballero told the Tribunal he knew the garage wasn't consented for residential use, and adjudicator John Greene agreed it was "self-evident" that a car garage was unlawful residential premises. The tenant moved out in late May 2026 after the landlord tried to raise the rent by $10 a week without notice. Greene ordered the landlord to pay a 50% rent refund ($2,775, reflecting that the tenant did get some benefit from living there), exemplary damages of $1,500 for the breach, and a further $1,500 compensation for the effect the unlawful, cold, "draughty" premises next to the family's chicken coop had on the tenant. A separate claim over the unlawful rent increase and one over alleged retaliatory termination were both dismissed on narrower technical grounds - only the unlawful-premises claim succeeded, and it was enough on its own to cost him more than he ever collected in rent.

What Actually Counts as "Unlawful Residential Premises"?

Per Tenancy Services' own guidance, a property is unlawful residential premises when any of the following apply:

• it is not consented for residential use, needs a change of use consent, or there is some other legal reason it cannot lawfully be lived in;
• there is unconsented building work that means the property cannot lawfully be lived in; or
• the local council has deemed it unsafe or unsanitary.

Tenancy Services explicitly names a garage, a property inside commercial premises, and "a minor dwelling, such as a 'granny flat' or 'family flat'" as examples of spaces that may not be lawfully rentable as separate homes. A single house that has been split into two self-contained homes without consent is on the same list. The test is about the physical space and its consent status, not about how well-meaning the arrangement was or whether the tenant agreed to the terms going in.

Why Is Renting Out a Room Fine, But Not a Garage?

This is the obvious question the Christchurch case raises: landlords rent out spare rooms all the time, so why is a garage different? The answer is about what the specific space itself is consented for, not about whether you're renting "a room" versus "a whole building." A bedroom inside a house is part of a structure the council has already approved as habitable - residential use covers every room in it, so putting a tenant or flatmate in a spare bedroom doesn't change what the building is consented for. A garage is consented, if at all, as a garage: vehicle storage, not human habitation.

MBIE's own "Can I Build It" guidance makes the distinction explicit: a small, consent-exempt garage may only be used for sleeping accommodation when it is "used in connection with a dwelling" and contains no cooking facilities - in other words, as a dependent extra sleeping space for someone who is already part of that household, not as an independent home rented out to a stranger. The moment a garage is let to an unrelated tenant as their own separate residence, with their own right to exclusive occupation, that use falls outside what the space was ever consented or exempted for, and it becomes exactly the unlawful residential premises problem the Christchurch case turned on - regardless of whether you think of it as "just renting out a room."

Does it change anything if the garage is internal rather than standalone - ground floor, under the same roof, with its own door straight into the house? No. Architectural firms who deal with this daily are clear on the point: a garage is classed as non-habitable space under the Building Code regardless of whether it's attached or detached, and what triggers a building consent is turning non-habitable space into habitable space - insulation, moisture control, ventilation, and natural light to Code standard - not whether a wall was structurally altered, and not whether there's an interior door to the rest of the house. An attached garage used purely as an extra bedroom, with no kitchen added, does not trigger the heavier formal "change of use" process under the Building Act (that applies once you create a self-contained unit with its own kitchen and bathroom), but it still generally needs an ordinary building consent for the work that makes it fit to sleep in. For a landlord renting that space to a tenant, "no kitchen" and "there's a door to the hallway" change nothing about the Tenancy Tribunal's test: what matters is whether the physical space itself has ever actually been consented as habitable, not how it connects to the rest of the house.

What About the New Granny Flat and Sleepout Building Consent Exemptions?

Since 2020, and expanded further under a dedicated granny flats exemption from late 2025, NZ law lets you build certain small standalone structures without a full building consent: sleepouts up to 30 square metres, and genuine granny flats up to 70 square metres, provided you follow the exemption's conditions (a licensed building professional carries out or supervises the work, you notify the council before and after building, and the structure meets the Building Code). This is exactly the kind of building people put up hoping to rent out - and exactly where the distinction between "exempt from a building consent" and "lawful to rent out" gets misunderstood.

A sleepout under the 30 square metre exemption is explicitly not allowed to have cooking or bathroom facilities and stay in that exempt category - per the Ministry-linked Licensed Building Practitioners Board's own guidance, "the sleepouts included in this exemption are not designed to be lived in exclusively," and a homeowner who wants a kitchen or toilet in one has to apply for a full building consent instead. Practically, that means a bare consent-exempt sleepout is not a self-contained home a tenant could legally occupy on its own - it depends on the main house's facilities, which makes it a room or flatmate arrangement at most, not an independent tenancy. If someone adds a kitchenette and toilet to a "sleepout" to make it independently rentable without ever applying for the consent that requires, that structure is now unconsented building work, and the same unlawful- premises exposure as the Christchurch garage case applies.

The 70 square metre granny flat exemption is different - it is meant to be a genuine, self-contained dwelling with its own kitchen and bathroom, and several property-law sources confirm a properly built, consent-exempt granny flat generally can be rented out as its own tenancy, provided it independently complies with the Residential Tenancies Act and the Healthy Homes Standards. But "properly built" is doing real work in that sentence: the exemption's own paperwork trail (council notification before and after the build, sign-off from the licensed professionals involved) exists precisely so the council and any future tenant can verify the dwelling actually qualifies. Skip that process - or rent it out before it is complete, or in a form that no longer matches what was notified - and you are back to the same unconsented-building-work problem, just with a nicer building.

What About a Bought Sleepout, Trailer, or Shipping Container?

With the housing shortage pushing more people toward creative options, buying a prefab kitset sleepout, a habitation-fitted trailer, or a converted shipping container (a standard 20-foot or 40-foot unit) to put in the backyard and rent out is an increasingly common idea. None of that changes the legal analysis. A structure being small, portable, or bought ready-made from a supplier does not exempt it from the same building consent and exemption rules that apply to anything else built or placed on the property for habitation - a converted container fitted out with a kitchen and bathroom is either consented, or it needs to qualify under one of the exemption pathways above and follow their conditions exactly, or it is unconsented building work the moment someone lives in it. A trailer or container dropped on site and rented out without going through either process carries exactly the same Tenancy Tribunal exposure as the Christchurch garage, regardless of how new or comfortable it is inside.

What Can a Tenant Do If They're Living in an Unlawful Premises?

A tenant who finds out their rental is unlawful residential premises can give the landlord just two days' notice to end the tenancy, instead of the notice periods that would otherwise apply, provided the premises was unlawful at the start of the tenancy and remains unlawful. The Tenancy Tribunal has full jurisdiction over these cases, meaning a tenant can also apply for a rent refund, compensation, and exemplary damages without having to separately establish anything else - the unlawful status of the premises is itself enough to found a claim, as the Christchurch case shows.

What Does an Unlawful Premises Breach Actually Cost a Landlord?

Exemplary damages exist specifically for breaches serious enough to count as an "unlawful act" under the Act, and Tenancy Services confirms that Schedule 1A of the Residential Tenancies Act sets the maximum amounts the Tribunal can award for each category of unlawful act, with the actual amount depending on how serious the act was and its impact on the tenant. In the Christchurch case that added up to $1,500 on top of a rent refund and compensation - and that was before the landlord's own counterclaims about property damage and mess were even considered, which the Tribunal couldn't rule on because he hadn't filed his own application.

Separately, if the space you're renting out is a genuine, consented dwelling rather than an unconsented one, it still has to meet the Healthy Homes Standards - heating, insulation, ventilation, moisture and drainage, and draught stopping. Non-compliance is its own breach of the Act, with exemplary damages of up to $7,200 per breach available to the Tribunal, and a separate penalty of up to $500 for failing to include the required healthy homes compliance statement in the tenancy agreement. A converted garage or sleepout that somehow did get consent for residential use still has to clear this bar before it can legally be rented out at all.

Why Is This Happening More Right Now?

NZ's housing shortage means spare garages, sleepouts, and granny flats are an obvious-looking answer for a landlord who wants to help someone out, or simply make use of space that would otherwise sit empty. That pressure is exactly why this is worth writing about now rather than treating it as a rare edge case: a workmate who "begged" for somewhere to stay is a completely ordinary, sympathetic scenario, and it still ended with the landlord paying out more than he ever collected. The tenant's own willingness to move in, and even the landlord's genuine belief he was doing a favour, made no difference to the outcome.

What Should a Landlord Do Instead?

If you're considering renting out a garage, sleepout, converted shed, or minor dwelling on your property, check with your local council whether that specific space has consent for residential use before you rent it to anyone, family, friend, or workmate included. If it doesn't have consent, getting a change-of-use consent (where that's even possible for the space) has to happen before a tenancy starts, not after. If you're weighing up whether the upfront cost and hassle of consenting a minor dwelling is worth it against the rent it could bring in, the Christchurch case is a useful data point: the downside if it goes wrong is not capped at giving the rent back.

If you're already managing tenancies across multiple dwellings on one property, whether that's a main house plus a consented minor dwelling or several units, register for a free RentManager account and the property setup will track each dwelling separately, so what's consented, what Healthy Homes documentation exists, and what's actually being rented out stays a clear record rather than something you're relying on memory for.