House Insurance NZ: A Complete Guide to Protecting Your Home

For most New Zealanders, the family home is the single biggest asset they will ever own — and house insurance is the financial safety net standing between a disaster and financial ruin. Yet plenty of homeowners misread what their policy actually covers, set their sum insured too low, or only discover the gaps when they come to claim. This guide explains, in plain language, how house insurance works in Aotearoa New Zealand: what it protects, how the natural-hazard system fits in, how to set a realistic sum insured, where the common traps lie, and how to compare cover sensibly. It is general information, not financial advice.

What house insurance covers — and how it differs from contents

House insurance (also called building insurance) pays to repair or rebuild your home if it is damaged or destroyed by an insured event — fire, storm, a burst pipe, an impact, or a natural hazard such as an earthquake. It is worth being precise about terminology, because in New Zealand house and contents are two separate products that you usually buy alongside each other.

House cover applies to the physical structure and anything permanently attached to it: the walls, roof, floors and foundations, plus fixtures such as built-in wardrobes, the hot-water cylinder, fitted kitchens and bathrooms, and typically outbuildings, fences, decks, driveways and retaining walls (subject to policy limits). Contents insurance is a distinct policy for the moveable things inside — furniture, appliances, clothing, electronics and personal effects. Our contents insurance guide covers that side in detail, and a good insurance adviser can help you structure both so there are no gaps between them.

Most New Zealand house policies are now sold on a replacement basis up to a nominated sum insured — meaning the insurer aims to rebuild to an equivalent standard rather than paying only the depreciated (indemnity) value of what was lost. That distinction, and the number you put on your policy, matters enormously, as we explain below.

Natural Hazards Commission cover and how it fits your policy

New Zealand sits on the boundary of the Pacific and Australian tectonic plates, so earthquakes, tsunamis, volcanic activity and landslides are a real and recurring risk. That is why home insurance here works as a two-layer system, and why every homeowner needs to understand both layers.

The first layer is government-backed natural-hazard cover. On 1 July 2024 the Earthquake Commission (EQC) was replaced by the Natural Hazards Commission Toka Tū Ake (NHC) under the Natural Hazards Insurance Act 2023. If you hold a current private house policy, you automatically have NHCover for natural-hazard damage to your home — earthquake, natural landslip, volcanic eruption, hydrothermal activity, tsunami, and storm or flood damage to residential land. The building cap is $300,000 plus GST per natural-hazard event (raised from $150,000 for damage occurring on or after 1 July 2024). You can read the detail at naturalhazards.govt.nz.

The second layer is your private insurer. Any rebuild cost above the NHC cap, and all damage from non-natural events such as fire, burst pipes, theft or accidental damage, is covered by your private policy up to your sum insured. In practice you now lodge natural-hazard claims through your private insurer, who coordinates the NHC portion for you. The reforms also simplified the NHC excess: for damage on or after 1 July 2024 it is a flat $500 per insured home for a building claim, replacing the old percentage-based formula. The key takeaway is that the NHC is a floor, not a ceiling — on today’s build costs, $300,000 does not rebuild most homes, so adequate private cover is essential.

Setting your sum insured: rebuild cost, not market value

Since the Canterbury earthquakes, almost all New Zealand policies have moved to a sum insured model: you nominate the maximum the insurer will pay, and if the rebuild costs more, you wear the shortfall. Getting that number right is the single most important decision you make about your cover.

The figure should reflect the cost to rebuild your home — not its market value, purchase price, council rating value or land value. Market value includes the land, which you do not need to insure (the land does not burn down). In Auckland, Queenstown or Wellington, market value can be two or three times the rebuild cost, so copying across a market figure can leave you paying for cover you do not need. A realistic rebuild estimate should include demolition and debris removal, materials and labour at current prices, professional and consent fees (commonly around 10–15% of the build), compliance upgrades to meet current building codes, and GST — and you should check whether the quoted figure is GST-inclusive.

Under-insurance is common and costly in New Zealand, driven by sharply rising construction costs, renovations that were never reported to the insurer, and policies left on autopilot for years — a problem Canterbury homeowners learned the hard way. A practical starting point is an online rebuild calculator such as Cordell Sum Sure, which most major insurers use or offer; for older, architecturally unusual or high-value homes, a registered quantity surveyor or valuer is worth the cost. Consumer NZ and other independent bodies repeatedly flag under-insurance as the biggest avoidable risk for homeowners. One alternative worth knowing about is area replacement cover, offered by a small number of insurers, which pays the full rebuild cost based on your home’s floor area rather than a fixed dollar sum — useful protection if build costs spike after a widespread disaster. Whichever model you choose, review the number every year at renewal.

Common exclusions and how excesses work

Knowing what your policy does not cover is just as important as knowing what it does. Exclusions vary between insurers, so the wording in your Product Disclosure Statement (PDS) is what counts, but the usual suspects include:

• Gradual damage and wear and tear — cover is for sudden and accidental events, not slow deterioration, rot or rust (though many policies offer limited gradual-damage cover for hidden water leaks).
• Lack of maintenance — damage that a reasonable owner should have prevented.
• Some flooding and rising groundwater situations, and gradual subsidence or earth movement that is not a sudden natural-hazard event.
• Pests and vermin — including damage caused by borer, rodents or insects.
• Intentional or illegal acts by you or anyone at the property with your permission.
• Unoccupied homes — most policies restrict or exclude cover once a house has been empty beyond a set period (commonly 60 days); tell your insurer if you will be away.

An excess is the amount you contribute towards each claim. Two excesses can apply to the same loss: the NHC building excess (a flat $500 for damage on or after 1 July 2024) and your private insurer’s standard excess (often $400–$1,000, and sometimes reducible or increasable to change your premium). Some policies also apply a separate, higher natural-disaster excess for events like earthquakes — historically a percentage of the sum insured rather than a flat figure. Always read the excess schedule in your policy before you need it, so there are no surprises at claim time.

How to compare home insurers in New Zealand

The New Zealand market is reasonably competitive and is dominated by a handful of underwriters. IAG sits behind AMI, State and NZI; Suncorp underwrites Vero and is a partner in AA Insurance; Tower and the mutuals FMG and MAS round out the main players. The Insurance Council of New Zealand (ICNZ) publishes useful industry data on natural-hazard losses and claims. Our AA Insurance review and Tower Insurance review look at two well-known home-and-contents insurers in more depth.

When you compare, do not look only at the premium. Weigh up the policy definitions (how tightly the insurer defines terms like “flood”, “storm”, “accidental” and “gradual damage” — looser cover is worth more at claim time), the sum-insured tools they offer, their claims reputation and financial strength rating, the excess options, useful add-ons (accidental damage, specified high-value items, landlord extensions), and any multi-policy discount for holding house and contents together. The Financial Markets Authority (FMA) oversees insurer conduct, and independent reviews can give a feel for real-world claims handling.

Making a claim, step by step

What you do in the first hours after a loss can shape how smoothly your claim resolves:

1. Make the property safe. If there is a gas leak, fire or structural danger, prioritise safety and call emergency services on 111.
2. Prevent further damage. Board up windows, turn off the water, or tarp a damaged roof if it is safe to do so — most policies require you to take reasonable steps, and you can usually claim the cost of emergency repairs (keep the receipts).
3. Document everything. Take photos and video of the damage before any clean-up, and make a list of what was lost or damaged.
4. Notify your insurer promptly. For a natural-hazard event your insurer will also handle the NHC portion of the claim on your behalf.
5. Get quotes and cooperate with the assessor. The insurer may send a loss adjuster or ask for repair quotes from licensed tradespeople.
6. Check the settlement offer. If you disagree, use the insurer’s internal complaints process first, then escalate — free of charge — to the Insurance & Financial Services Ombudsman (IFSO), an independent dispute-resolution scheme.

How to avoid being caught out

A few simple habits make most of the difference between a policy that pays and a nasty shock:

• Review your sum insured every year rather than auto-renewing, and re-run a rebuild estimate after any price rises.
• Tell your insurer about renovations. A deck, a new kitchen, a sleep-out or a heat pump all raise your rebuild cost and should be reflected in your cover.
• Read the policy document, not just the summary. The PDS holds the definitions, limits and exclusions that decide a claim.
• Keep a home inventory — a photo or video record stored off-site — to speed up any contents claim.
• Check your mortgage conditions. Your bank will almost certainly require adequate house insurance, so letting cover lapse could breach your home loan agreement.

Getting house insurance right is not a set-and-forget exercise. Pull out your current policy, check the sum insured against a fresh rebuild estimate, and compare two or three alternatives on both price and definitions before you renew. A few hours now can save you tens of thousands of dollars when it matters most. For related cover, see our guides to life insurance and car insurance.

Disclaimer: This article is general information about house insurance in New Zealand, not financial advice, and not a recommendation of any insurer or policy. Cover, definitions, exclusions, excesses, NHC caps and premiums vary by insurer and change over time — always read the Product Disclosure Statement, confirm the current NHC limits, and check your sum insured against a current rebuild estimate before relying on your cover. Consider advice from a registered financial adviser for complex situations.

Frequently asked questions

What’s the difference between house and contents insurance?

House (or building) insurance covers the physical structure — walls, roof, floors, foundations and permanently attached fixtures such as built-in cabinetry and the hot-water cylinder. Contents insurance covers the moveable items inside, such as furniture, appliances, clothing and electronics. They are separate products in New Zealand, though insurers often bundle them together at a discount.

What does Natural Hazards Commission (NHC) cover, and does it replace private insurance?

The NHC — which replaced the EQC on 1 July 2024 — provides a first layer of cover for natural-hazard damage (earthquake, natural landslip, volcanic activity, tsunami, and storm or flood land damage) when you hold a valid house policy, up to a building cap of $300,000 plus GST per event. It does not replace private insurance: rebuild costs above the cap, and non-natural events like fire, are covered by your private insurer up to your sum insured.

How do I work out my sum insured?

Base it on your home’s rebuild cost — demolition, materials, labour, professional and consent fees (around 10–15%), compliance upgrades and GST — not its market value, which includes the land you don’t need to insure. Use a rebuild calculator such as Cordell Sum Sure as a starting point, or a registered valuer or quantity surveyor for older or high-value homes, and review the figure every year because construction costs have risen sharply.

What does house insurance usually not cover?

Common exclusions include gradual damage and wear and tear (cover is for sudden, accidental events), lack of maintenance, some flood and rising-groundwater situations, gradual subsidence, damage by pests and vermin including borer, intentional or illegal acts, and homes left unoccupied beyond a set period (often 60 days). Definitions vary between insurers, so always check your own policy wording.

Do I have to have house insurance if I have a mortgage?

Effectively yes. Your bank will almost certainly require you to hold adequate house insurance as a condition of your home loan, and letting it lapse could breach your loan agreement. Even without a mortgage, going uninsured on your largest asset is a serious financial risk given New Zealand’s exposure to natural hazards.