Tiny Homes and Relocatables: Consent, Finance and Insurance
A tiny home looks like a way around the cost of a house. Build it on a trailer, the reasoning goes, and it is a vehicle rather than a building, so no consent, no council, no problem. That reasoning is wrong often enough to be expensive, and the people who discover it usually do so after the thing is built.
The law does not ask whether your home has wheels. It asks whether the home is immovable and whether people occupy it permanently or long term. A tiny house can be a vehicle, a building, or genuinely both at once, and which of those it is decides everything that follows: whether you need consent, whether a bank will lend on it, whether an insurer will cover it, and whether the council will rate it.
The three things to remember
Putting a house on a trailer does not automatically make it a vehicle. A tiny house on wheels is also a building if it is immovable and occupied permanently or long term. And all building work must comply with the Building Code, whether or not a consent is required.
Believing that no consent required means no rules apply. It does not. Building work has to meet the Building Code either way. An exemption removes the paperwork, not the standard. A tiny home that never needed a consent but does not meet the Code is still non-compliant, and that surfaces when you try to sell it, insure it, or connect it to services.
The question that decides everything
MBIE published updated tiny house guidance in January 2026, and its central point is that classification is a judgement about the actual situation rather than about the design. Two identical tiny houses can land on different sides of the line depending on how they are used.
There is a weight dimension too. A trailer has weight limits, and beyond them what you are towing may be treated as a load rather than a vehicle, which raises its own transport questions before the building ones are even reached.
If it is a building
A tiny house fixed to land needs a building consent to construct, in the ordinary way, and then a code compliance certificate at the end. That certificate matters more than people expect, because it is the document a future buyer's lawyer will ask for and the one an insurer may want to see.
Consent brings the rest of the council relationship with it: the district plan, minimum dwelling standards, setbacks, servicing, and potentially development contributions. None of that is unreasonable, but all of it is cost and time that the tiny house budget usually has not allowed for.
A separate exemption for small standalone dwellings, widely described as the granny flat change, came into effect in early 2026. It is aimed squarely at this problem: a simple, small, single-storey dwelling built to a defined standard on a site that already has a house. If your plan fits that shape, it may be a cleaner path than arguing about whether a tiny house on a trailer is a vehicle. Check the current criteria with your council before designing to them, because the detail decides whether you qualify.
If it is a vehicle
Being a vehicle does not make the rules disappear, it swaps them. Registration, warrant of fitness or certificate of fitness, towing weight, brakes and lighting all become live. Where the tiny house is self-contained, the self-containment standard applies if you intend to freedom camp, and that standard has changed in recent years.
The district plan still has views about how long a vehicle may be lived in on a site. Councils differ considerably here, and a rule that is relaxed in one district is enforced in the next. This is the single most locally variable part of the subject, and it is why a guide can tell you what questions to ask but not what the answer will be at your address.
Finance: the part nobody warns you about
An ordinary mortgage is secured against land and whatever is permanently attached to it. A tiny house on wheels is not attached to land, so there is nothing for a mortgage to attach to either.
| Classification | Usual finance route |
|---|---|
| Fixed dwelling with consent and a code compliance certificate | Mortgage, on normal terms, because it is part of the land |
| Tiny house on wheels, on land you own | Personal loan or a chattel or vehicle loan, at markedly higher rates and shorter terms |
| Tiny house on wheels, on land you do not own | Hardest case. No land security, no certainty of tenure, so the lending is unsecured or nearly so |
The interest rate difference is the whole financial story. A dwelling financed at mortgage rates over thirty years and the same sum financed as a personal loan over seven are entirely different propositions, and the tiny house is usually only cheap in the first comparison. Run both through the personal loan repayment calculator and a mortgage repayment calculator before deciding the small house is the affordable option.
Insurance follows classification too
House insurance covers a dwelling at an address. Vehicle insurance covers a thing that moves. A tiny house on wheels can fall awkwardly between them, and some insurers will not write it at all, while others treat it as a caravan with contents.
Ask the specific question before you build: what policy would you issue for this, on this site, occupied full time. A general assurance that "we cover caravans" is not the same answer, because a caravan parked up for holidays and a caravan lived in permanently are different risks to an insurer.
Relocatable and transportable houses
A relocatable house is a different animal from a tiny house on a trailer, and it is often the better answer for someone who wants a small home without the classification argument. It is built off site as a building, transported, then fixed to piles on your land. It needs consent, it gets a code compliance certificate, and at the end of it you own an ordinary house that happens to have been built somewhere else.
Because it becomes part of the land, it is mortgageable and insurable on normal terms. The trade-off is that you take on the full consent process and the site works: foundations, services, access for a very large truck, and often a crane.
Houses removed from sites being redeveloped can be genuinely cheap to buy. The purchase price is rarely the main cost. Removal, transport permits, a new foundation, reconnection of services and bringing an older building up to current standards where the work triggers it can each exceed what you paid for the house. Price the whole project before the house looks like a bargain.
Questions to ask, in order
What this guide does not cover
District plan rules vary by council and are the most locally specific part of this subject. Papakainga housing and building on multiply owned Maori land follow a different process again. Resource consent, as distinct from building consent, is a separate question that can arise on its own. If a determination has been issued about a situation like yours, MBIE publishes them and they are worth reading. This is general information rather than legal, building or financial advice.
Test Your Knowledge
Ten questions on small dwellings and the rules that decide their fate.
Sources: MBIE Building Performance tiny house guidance published January 2026, MBIE guidance on building work that does not require a building consent, and MBIE material on the small standalone dwelling exemption effective early 2026. District plan rules vary by council and must be checked locally.
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