Underinsurance For Home Cover
Underinsurance is more common than you might think. Many homeowners don’t realise that their home insurance cover isn’t adequate to protect their home in the event of a fire or an accident that would necessitate a rebuild.

What Is Underinsurance?
Underinsurance is when your insurance payout or premium doesn’t match the cost of repairing or rebuilding your home. It’s a serious and common occurrence that can leave you ill-prepared and unable to cover your losses in the event of a property-damaging incident such as a fire.
Because people do not review their insurance frequently, they can find themselves facing a higher cost of rebuilding or major repairs than their insurance covers.
In order to avoid underinsurance, you must verify that your insurance matches or supersedes the true market value of a rebuild of your home. This cost changes over time as inflation rises and the cost of hiring skilled tradespeople increases.
Therefore, it is vital that you review your insurance premiums annually and address any projected shortfalls.
What Happens If You Are Underinsured?
Being underinsured opens you to the risk of having to fund the cost of a rebuild from your own resources. As a project like this is done in the event of an unexpected and serious event, it leaves very little room or time for financial planning. The real cost of a rebuild or major home repair, including the cost of home contents, can be much higher than your insurance covers, and the resulting bill can be high.
Common Reasons For Underinsurance
There is a range of underinsurance issues that are easily managed if they are considered in advance and regularly. They include:
Keeping abreast of changes in the cost of building work is essential. Unfortunately, costs rarely fall, but they can grow rapidly in an active economy.
The cost of a rebuild is estimated at the start of our insurance contract, and premiums are set accordingly. As the years pass, these costs can grow, and if our insurance premiums and subsequent payouts don’t match, then we can be left out of pocket in an emergency.
An annual review of building costs and our insurance premiums will help with financial planning and alert us if we need to increase our premiums to match changes in the economy.
Home improvements, such as kitchen extensions, attic conversions or the construction of garages or garden rooms, can significantly increase the cost of rebuilding your home.
However, in the rush to complete these and manage the cost of the improvement, we can easily forget that our insurance needs to be improved, too. If homeowners don’t ensure their insurance payouts match the new value of their homes, they face a shortfall in the payout and the bills for a home rebuild.
If you don’t update your policy when improvements or valuable possessions are added to your home, then they cannot be added retrospectively. If the worst happens and your house or possessions need to be replaced, it is too late to inform your insurance provider afterwards.
You must update your insurance policy every time you add value to your home. This won’t necessarily increase your premiums, but it will ensure the true value of your home is included in your insurance coverage.
How To Calculate Underinsurance
Calculating whether you are underinsured will require some research into the current market cost of replacing your home. Once you have this done, it is easy to understand.
Steps to calculate underinurance:
- 1Calculate the cost of rebuilding your home, and when doing this, ensure that you include the cost of demolition and the value of all your home possessions – not just the build.
- 2Consult your insurance policy to ascertain how much you are insured for.
- 3Divide the value of your insurance premium by the estimated cost of a demolition and rebuild.
Example:
A home is insured for €300,000, but the cost of a rebuild is estimated at €400,000.
Divide the insurance value (€300,000) by the rebuild cost (€400,000), and the result is the percentage you are covered for (75%).
Result: 75%
Example 1
A house is insured for €250,000, but the cost of rebuilding is now €400,000.
250,000/400,000=0.625. This home is underinsured. The insurance payout will only cover 62.5% of the cost of a rebuild, and you will need to source the remaining 37.5% yourself.
Example 2
A house is insured for €500,000, but the cost of a rebuild is €400,000.
500,000/400,000=1.25. This home is overinsured and will cover the cost of rebuilding your home.
Example 3
A house is insured for €400,000, and the cost of a rebuild is €500,000.
400,000/500,000 = 0.8. This home is underinsured. The insurance provider will cover 80% of the rebuild, and the homeowner will have to pay the remaining 20%.
Home Rebuild Costs
Most Western countries, including Ireland, are experiencing a cost-of-living crisis. Household incomes are struggling to keep pace with inflation and the rising costs that come with it.
These increased costs encourage homeowners to try to save money, and one area that is prone to this is insurance costs. It may feel as though saving money on your monthly premiums is prudent, but it really does pay off in the long term to conduct regular insurance reviews.
How To Calculate Rebuild Costs
The Society of Chartered Surveyors of Ireland has an online tool that can help you to calculate the cost of a potential rebuild. To benefit from it, you will need some basic information about your home.
- 1Calculate the internal size of your home. Do this by measuring the floor space on each floor of your home.
- 2If your home has floors of different sizes, calculate each separately.
- 3Calculate the cost of internal fixtures and fittings. Aim higher than you may have paid for your kitchen, for example, as these costs rise regularly.
- 4Once you have these figures, use the calculator and select the house type and the region where it is located.
How To Avoid Underinsurance
- 1Review your insurance policy annually to ensure it keeps pace with inflation and the cost of rebuilding in your region.
- 2Identify whether you have added value to your home in the past 12 months in terms of building extensions, garden rooms or new fitted kitchens or the like.
- 3Every few years, consider having your house reevaluated. While the cost of a rebuild is not equal to the cost of buying your home at its market value, knowledge of your home’s value in the housing market is a vital indicator of the insurance levels required.
- 4Understand the cost of rebuilding your home and compare it to your current insurance coverage.
Inflation Protection for Home Insurance
Index linking is the term used to refer to inflation protection for your home insurance. It uses indices such as the building cost index to automatically track and increase coverage. It normally includes a subsequent price increase in your monthly premium, but offers the reassurance that your premiums match market rebuild costs.
It cannot calculate the value of new extensions or home purchases, so you must notify your provider separately to have them included. The index is linked to the original home at the time the insurance was taken out.
Underinsurance FAQs
This is a clause inserted in policies to encourage homeowners not to undervalue the cost of a rebuild. If a home is underinsured, this clause is triggered, reducing the insurance provider’s payment by 25%.
For example, if a home is insured for €300,000 but its rebuild costs are €400,000, then it is undervalued. This triggers the Condition of Average clause, so any claims under the house insurance will be reduced by 25%.
Example: If a leak causes water damage that costs €40,000 to repair, then the calculation of the condition of average clause would look like this: 300,000 / 400,000 x 40,000 = 30,000. In this scenario, the payout is reduced by 25%.
The clause is designed to encourage homeowners to review the cost of a rebuild. If the home is not undervalued, the clause does not come into effect.
You need to know the market value of your home when planning your insurance, but this price, the amount you would receive when selling your home, is not the same as the rebuild cost.
The rebuild cost is generally lower as it doesn’t include the cost of the land. Understanding both is vital to ensure that your home is adequately protected.
An annual insurance review is ideal, particularly in the weeks leading up to your premium renewal. However, an additional review would be warranted whenever you increase the value of your home by adding extensions, garden rooms or new furniture or fittings.
Over-insurance adds a degree of waste to monthly premiums, but it is preferable to being underinsured. Your insurance provider will only payout relative to the cost of a rebuild or repair, so being over-insured will not bring you a higher payment.
However, being underinsured means that you will be liable for a financial outlay to make up the shortfall in the cost of a rebuild.
It is best to review your insurance needs on an annual basis and set the premiums and cover at the appropriate level, and not face either over- or underinsurance.
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