Underinsurance is one of the most common and often overlooked risks for business owners. Many policies look sufficient at first glance, but without the right level of cover in place, a claim could leave you significantly out of pocket.
This guide explains what underinsurance means, how it can affect your claim, and the simple steps you can take to make sure your property and business are properly protected.
What is Underinsurance?
Underinsurance occurs when your insurance cover is insufficient to fully rebuild or replace your property and assets in the event of a loss.
A common misconception is insuring a property based on its market value. In reality, insurance should reflect the rebuild (reinstatement) cost, which is the amount required to reconstruct the property from scratch, including materials, labour, and professional fees.
If your cover falls short, you may have to fund a significant portion of any claim yourself, potentially putting your business at risk.
Why Underinsurance is Still a Major Issue in 2026
Underinsurance continues to be a widespread challenge for property owners, often caused by policies not keeping pace with changing circumstances rather than a single event.
Some of the most common reasons properties are underinsured today include:
- Outdated valuations: Many policies are renewed each year without reviewing the rebuild cost
- Rising rebuild costs: Ongoing increases in materials, labour, and professional fees
- Property changes: Extensions, refurbishments, or increased stock levels not being declared
- Complex buildings: Older or non-standard properties that are harder to accurately value
As a result, many properties remain insured below their true rebuild value. This makes regular reviews and accurate assessments more important than ever to ensure your cover remains fit for purpose.
The Risk: Understanding the Average Clause
One of the most important and often misunderstood parts of property insurance is the average clause. This clause is designed to ensure that policyholders insure their property for its full value. If they don’t, insurers may reduce the amount they pay out on a claim in proportion to the level of underinsurance.
We say may because insurers are not legally required to apply average in every situation, but in practice it is very common. The principle is simple: if you only insure a percentage of the true value of your property, the insurer can reduce any claim by that same percentage.
Here’s how it works in real terms:
- True rebuild cost: £500,000
- Sum insured: £250,000
- Level of underinsurance: 50%
Because the property is insured for only half of what it would actually cost to rebuild, the insurer could treat you as being responsible for the other half of the risk. So if you made a claim for £100,000 worth of damage, the insurer may only pay 50% of the claim, leaving you with a payout of £50,000.
Even though the loss is well within the insured amount, the payout is reduced because the overall cover was insufficient. This can leave businesses facing unexpected and significant costs at the worst possible time, often when they are already dealing with the disruption of a major loss.
How to Calculate the Right Level of Cover
To avoid underinsurance, it’s essential to accurately calculate your rebuild cost.
Key factors include:
- Property type: Detached, semi-detached, or terraced
- Building age and status: Older or listed buildings often cost more to rebuild
- Material costs: Continuously rising due to inflation
- Labour costs: Increased due to industry skill shortages
- Professional fees: Architects, surveyors, and planning costs
- Clearance costs: Removing debris after damage
- Property changes: Extensions, refurbishments, or increased stock levels
Regularly reviewing these factors ensures your policy remains accurate over time.
Rebuild Cost vs Market Value
It’s important to separate these two:
- Market value: What your property would sell for
- Rebuild cost: What it costs to reconstruct it from the ground up
Insurance should always be based on the rebuild cost, not the market value. Market value reflects factors like location and demand, whereas rebuild cost focuses purely on what it would take to reconstruct the property after a loss.
The Role of Professional Assessments
Given the complexity of rebuild calculations, many businesses benefit from a professional assessment.
A qualified surveyor can:
- Provide an accurate rebuild valuation
- Account for current material and labour costs
- Include all professional and regulatory expenses
- Help determine appropriate business interruption cover
This not only improves accuracy but also provides peace of mind that your cover is sufficient. At 1st Choice, we can assist with this process. We are partnered with RebuildCostAssessment.com, who can provide either a desktop or onsite assessment from a specialised expert. Their vision is to help eliminate issues around inaccurate levels of cover for your property, and as the product is regulated by the RICS (Royal Institute of Chartered Surveyors), the outcome should give you peace of mind that the property has the correct insurance coverage.
Commercial Property and Liability Insurance: A Complete Safety Net
While property insurance protects your physical assets, liability insurance protects your business from claims made by third parties.
Property insurance covers:
- Buildings and premises
- Equipment and machinery
- Stock and inventory
- Fixtures and fittings
Liability insurance covers:
- Injury to customers or third parties
- Damage to third-party property
- Claims related to products or services
Together, these policies form a critical foundation for business protection, helping you recover quickly from both physical damage and legal claims.
Key Benefits of Getting It Right
- Financial protection: Avoid large out-of-pocket costs
- Business continuity: Recover faster after a loss
- Regulatory compliance: Meet landlord or contract requirements
- Peace of mind: Confidence that your business is fully protected
- Professional credibility: Build trust with customers and partners
How to Stay Properly Insured
To reduce your risk of underinsurance:
- Review your policy annually
- Update your insurer after any property changes
- Reassess rebuild costs regularly
- Consider a professional valuation
- Check your business interruption period aligns with rebuild times
Underinsurance isn’t always obvious, but its impact can be devastating. With rebuild costs continuing to rise, regularly reviewing your cover is no longer optional, it’s essential.
Ensuring your property is insured for the correct rebuild value, understanding how claims are calculated, and seeking expert guidance where needed can make all the difference when the unexpected happens.
If you’re unsure your cover is sufficient, now is the time to check it, before it’s too late.
If you would like to know more about how 1st Choice can help you, please get in touch with us on 0344 234 8394 or email us at admin@www.1stchoiceinsurance.co.uk.
