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The fairest way to compare house insurance quotes in New Zealand is to compare the cover first, then adjust for the different sum insured and excesses before comparing the price. The cheapest premium isn't necessarily the best value if it leaves you paying much more after a flood or a major rebuild.

A useful comparison has three parts:

1. Sum insured: Would each policy provide enough to rebuild your house after a total loss?
2. Flood excess: How much would you have to pay yourself if flood damage occurred?
3. Premium and cover: What do you pay each year, and what protection do you actually receive?

1. Make sure the sums insured are comparable

The sum insured is generally the maximum amount available for covered loss to the house, subject to the policy terms. It isn't necessarily the market value of your property.

For each quote, check whether the sum insured adequately accounts for:

• Demolition and removal of debris.
• Rebuilding costs, including labour and materials.
• Professional fees, such as architects and engineers.
• Council and building compliance requirements.
• GST and any other relevant rebuilding costs.
• Retaining walls, driveways, garages, sheds and other structures, where applicable.

Don't automatically choose the lowest sum insured just to reduce the premium. If one quote has a lower sum insured, ask the insurer to rerun it using the same realistic rebuilding estimate as the other quotes.

Also check whether the policy offers additional benefits above the sum insured or whether certain costs are included within it.

2. Compare flood excesses in dollar terms

The flood excess is the amount you contribute towards an eligible claim. A higher excess can make a policy cheaper, but it transfers more of the financial risk to you.

For example, imagine three quotes for the same house, with the same sum insured and broadly equivalent cover:

	Quote A	Quote B	Quote C
Annual premium	$2,400	$2,250	$2,100
Flood excess	$1,000	$2,500	$5,000
Extra excess vs A	—	$1,500	$4,000

These are illustrative figures, not actual market quotes.

Quote C saves $300 a year compared with Quote A, but you would pay an extra $4,000 if you had a claim subject to the flood excess.

How long would the savings take to offset the extra excess?

Using the example above, assuming premiums and excesses remain unchanged.

Quote B vs A

10 years

Extra $1,500 excess ÷ $150 annual saving

Quote C vs A

13.3 years

Extra $4,000 excess ÷ $300 annual saving

These are simple break-even calculations, not predictions of when a flood might occur. They exclude future premium changes, other policy differences and the time value of money.

A key question is whether you could comfortably afford the excess at short notice. A lower premium may be less attractive if the higher excess would be difficult to fund.

3. Check that the policies cover the same risks

Even when two quotes have the same sum insured, they may not provide equivalent protection. Compare the policy wording for:

• Flood and storm damage: What counts as flooding, and are there exclusions or restrictions for surface water, runoff or water entering the home?
• Excess rules: Is the flood excess separate from the standard excess? Can multiple excesses apply to one event?
• Natural hazards: How do the policy and the Natural Hazards Commission's NHCover work together?
• Additional structures: Are garages, sheds, fences, retaining walls, driveways and other improvements covered, and up to what limits?
• Temporary accommodation: What is the dollar limit and how long is it available?
• Settlement terms: Is the house covered for rebuilding, and are there sublimits or conditions that could reduce a payout?

In New Zealand, NHCover generally provides the first layer of building cover for eligible natural hazard damage, subject to its rules and building cap. For storm and flood damage, NHCover covers eligible residential land rather than the house itself; damage to the house is handled under your private policy. The relevant excesses and claim arrangements can differ, so don't assume the quoted flood excess tells you the entire cost of a natural disaster claim. About natural hazards cover :: Natural Hazards Commission Toka Tū AkeCover for storm, flood, and landslide damage :: Natural Hazards Commission Toka Tū Ake

4. Put every quote on a like-for-like basis

Ask each insurer or broker to reprice the policy using the same assumptions:

• Same realistic sum insured.
• Same level of cover and settlement basis.
• Same flood excess, if the insurer allows you to choose it.
• Same standard excess, where possible.
• Same property details and optional benefits.
• Annual premiums including GST, levies and fees.

If an insurer won't offer the same excess, keep its actual excess in the comparison and assess the trade-off separately. Don't try to adjust the premium mathematically in proportion to the sum insured; insurers' pricing isn't necessarily linear.

Consumer NZ recommends checking the sum insured carefully and comparing policy benefits alongside premiums. Its house insurance buying guide explains the differences between sum insured and replacement cover. How to get the best house and contents insuranceHouse & Contents Insurance: Sum Insured Explained

5. Use a simple comparison worksheet

Enter your actual quotes below. The figures update automatically.

Quote A

Insurer A

Sum insured ($)Annual premium ($)Flood excess ($)

Quote B

Insurer B

Sum insured ($)Annual premium ($)Flood excess ($)

Your comparison

Annual premium difference

$300

Sum insured difference

$0

Flood excess difference

$4,000

The sums insured match. Next, confirm that the cover and settlement terms also match.

Quote B has the higher flood excess. It saves $300 per year in premium, but the extra flood excess is $4,000.

This worksheet compares the numbers only; it does not assess policy wording, exclusions or whether either sum insured is sufficient.

My recommendation

Prioritise an adequate rebuild sum insured and clear, suitable flood protection. Once those are established, compare premiums and decide whether the lower premium is worth accepting the higher flood excess.

If you already have quotes, share the annual premium, sum insured and flood excess for each insurer (you can omit personal details). I can compare them side by side and show the annual savings, additional claim exposure and which differences need checking in the policy wording.