Full Replacement vs Agreed Value: Which Insurance Is Right for You?

Two Approaches to Buildings Insurance

When selecting buildings insurance, one of the most important decisions you'll make is choosing between full replacement value and agreed value (sum insured) cover. These represent fundamentally different approaches to determining how much your insurer will pay if your home is damaged or destroyed.

What is Full Replacement Value?

Full replacement value, also called "indemnity" cover, means your insurer will pay whatever it costs to rebuild or repair your home to its condition before the loss. There's no fixed amount – instead, the insurer pays for actual repairs or rebuilds, up to your policy limit.

How Full Replacement Works

Let's say your home is destroyed in a fire. The insurer sends assessors to determine the cost to rebuild it to its original standard. If rebuild costs turn out to be $600,000, that's what they pay (up to your policy limit). If costs exceed your estimate due to changed building codes or increased material costs, you're still covered.

Advantages of Full Replacement Cover

Peace of mind: You don't have to guess the exact rebuild cost
Automatic inflation adjustment: Costs are assessed at the time of claim
Protection against underinsurance: You won't be caught short if rebuild costs exceed your estimate
Building code compliance: New rebuilds must meet current building codes, which may be more expensive
Recommended by experts: Most insurance professionals recommend full replacement cover

Disadvantages of Full Replacement Cover

Higher premium: Full replacement cover typically costs more than agreed value
More complex claims: Disputes may arise about true rebuild cost
Policy limits still apply: You must set a reasonable policy limit

What is Agreed Value (Sum Insured)?

Agreed value, commonly called "sum insured," is a fixed amount you and your insurer agree upon when taking out the policy. In the event of a total loss, the insurer pays up to that amount, regardless of actual rebuild costs.

How Agreed Value Works

When you purchase your policy, you estimate your home's rebuild cost and agree on a sum insured with your insurer – say $550,000. If your home is destroyed, the insurer pays up to $550,000. If actual rebuild costs are less, you benefit from the difference. If they're more, you're responsible for the shortfall.

Advantages of Agreed Value Cover

Lower premium: Agreed value policies typically cost less than full replacement
Simple claims process: No debate about what rebuild costs should be
Clear limits: You know exactly what you'll receive in the event of total loss
Potentially cost-effective: If your estimate is accurate and rebuild costs don't escalate

Disadvantages of Agreed Value Cover

Underinsurance risk: If you underestimate rebuild cost, you won't receive enough
Inflation concerns: Building cost inflation may mean agreed value becomes inadequate
Building code changes: New codes may require more expensive construction
Your responsibility: You must accurately assess rebuild cost yourself
No flexibility: If circumstances change, you're locked into your estimate

A Practical Comparison

Scenario: Total Loss Claim

Your $400,000 home is destroyed in a fire. Actual rebuild cost is estimated at $500,000 (due to changed building codes and material cost increases).

Scenario	Full Replacement Cover	Agreed Value Cover ($400,000)
Payout Amount	$500,000 (actual rebuild cost)	$400,000 (agreed amount)
Your Gap	$0	$100,000
Annual Premium	Higher	Lower

Scenario: Partial Claim

Storm damage to your roof costs $15,000 to repair.

Scenario	Full Replacement Cover	Agreed Value Cover
Payout Amount	$15,000 (actual repair cost)	$15,000 (actual repair cost)
Your Out-of-Pocket	Your excess	Your excess

Factors to Consider When Choosing

Property Value and Risk Assessment

For high-value properties, full replacement cover is generally recommended. The risk of underinsurance is too great with agreed value.

Your Home's Age and Condition

Older homes may have more hidden repair costs, making full replacement preferable. Modern homes with clear rebuild specifications might suit agreed value.

Building Code Compliance

If your home requires significant upgrades to meet current building codes after damage, full replacement cover protects you from unexpected additional costs.

Your Financial Position

If you can't afford a shortfall between agreed value and actual rebuild cost, full replacement is safer.

Inflation Expectations

In inflationary periods, agreed value may become inadequate over time. Full replacement automatically accounts for cost increases at claim time.

Making Your Decision

Get a Professional Valuation

If choosing agreed value, obtain a professional rebuild cost valuation. Don't guess – underestimating is a common and costly mistake.

Review Annually

Whether you choose full replacement or agreed value, review your insurance annually. Building costs change, and your circumstances may shift.

Ask Your Insurer

When comparing insurance policies, ask each insurer to clarify what's included in their full replacement definition and what limits apply.

Consider the Premium Difference

Calculate the actual premium difference between the two options. Sometimes the difference is modest enough that full replacement is clearly the better choice.

What Most NZ Homeowners Choose

Industry trends show that most NZ homeowners are moving towards full replacement cover. The peace of mind and protection against underinsurance generally outweigh the modest additional premium cost. Insurance experts consistently recommend full replacement for residential properties.

Conclusion

While agreed value (sum insured) cover offers lower premiums, full replacement value typically provides better protection for NZ homeowners. The risk of underestimating rebuild costs and being left short is significant. Unless you can afford a shortfall, full replacement cover is the safer choice for protecting your home and financial security.