What is a Rebuild Cost Assessment?
A Rebuild Cost Assessment estimates the total cost to rebuild a property from scratch. This is based on the current construction costs including modern materials and labour and not the sale price of the property. It is a professional assessment that is completed by surveyors and construction specialists either on-site or on a desktop. It’s extremely important to insure your property for the right amount because it gives you peace of mind and financial protection for any future claims.
What Does a Rebuild Cost Assessment include?
- Demolition and site clearance.
- Labour and materials.
- Professional fees including architects, surveyors and engineers.
- Compliance with current Building Regulations.
- Access challenges or restricted sites.
- External works including drainage, boundary walls and car parks.
- VAT (where applicable)
Rebuild Cost vs Market Value
| Rebuild Cost | Market Value |
|---|---|
| Cost to Reconstruct | Price the Property sells For |
| Based on Building Costs | Influenced by Demand & Location |
| Used for Insurance | Using for Buying & Selling |
Why Property Owners Often Get It Wrong:
Common Mistakes:
- Using online calculators instead of a professional assessment.
- Not updating the rebuild costs after having an extension or refurbishment.
- Ingoring construction inflation.
- Assuming insurers automatically adjust the sums insured.
- Relying on outdated surveys.
The Real Risk of Getting Rebuild Costs Wrong: Underinsurance
Underinsurance occurs when the sum insured on a property is less than the actual rebuild cost. This means your insurance doesn’t cover the full cost of rebuilding your property if disaster strikes.
Example:
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Your property’s rebuild cost = £1,000,000
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Your insurance policy covers = £600,000
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You suffer a fire that causes £200,000 of damage
Because your policy is underinsured, the insurer may not pay the full £200,000, depending on the terms.
How The Average Clause Works in UK Insurance:
The average clause is a standard part of UK property insurance. It is triggered when a property is underinsured.
Mechanism:
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The insurer calculates the payout proportionally based on how underinsured the property is.
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Formula: Payout= Sum Insured Rebuild Cost × Claim Amount
Why Even Partial Claims Can Be Reduced:
Many property owners assume that underinsurance only affects large claims, but in the UK it can impact any claim, even minor ones.
How it works:
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The payout for a partial claim is calculated using the same proportional formula as the average clause.
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So, if you’re 60% insured, a £50,000 claim might only pay £30,000.
How Often Should a Rebuild Cost Assessment be Updated?
The Recommended Guidance:
- Every 3 – 5 years.
- After having major works or extensions
- Following significant cost inflation.
- Commercial or complex buildings including listed or heritage properties will need to be more frequent.
Do You Need a Rebuild Cost Assessment?
While some property owners may rely on online calculators or rough estimates, a professional rebuild cost assessment ensures your insurance accurately reflects the true cost of rebuilding. This is particularly important for commercial properties, multi-occupancy buildings, high-value homes, and listed or heritage properties, where construction costs can vary significantly.
Professional assessments are also recommended during insurance renewals or portfolio reviews, helping to avoid underinsurance and ensuring peace of mind should you ever need to make a claim.
At Avoca, we help homeowners and businesses make sure their properties are insured for the right amount with a comprehensive Rebuild Cost Assessment that is quick, affordable and trusted by insurers.
