As a Chartered Surveyor, I’ve worked with all kinds of properties – residential, commercial, heritage, and industrial. One thing that unites all responsible property ownership is this: ensuring the building is accurately insured. And central to this is the work carried out by insurance surveyors.
From catastrophic fires to storm damage and subsidence, the only certainty in property ownership is uncertainty. That’s why a properly calculated reinstatement valuation – determined by qualified insurance surveyors – isn’t just helpful; it’s essential.
What Do Insurance Surveyors Actually Do?
An insurance surveyor assesses the reinstatement cost of a property. This is the full amount it would take to completely rebuild the building from scratch in the event of total destruction – not the market value, but the cost to replace materials, labour, demolition, site clearance, and fees.
These valuations are critical when setting the sum insured on your building insurance policy. Over the years, I’ve seen far too many clients only realise their policy was inadequate when it came time to make a claim – by which point, it’s often too late.
Reinstatement Valuation vs Market Value
It’s important to distinguish between the reinstatement valuation and the market value of a property:
- Market value is influenced by location, demand, nearby schools, and local amenities.
- Reinstatement value is based on how much it would cost to reconstruct the property with similar materials and standards, including professional and statutory fees.
For example, a countryside cottage might be worth £250,000 on the open market, but if it requires specialist stonework and bespoke timber framing, the reinstatement cost could exceed £400,000.
If your building is insured for market value instead of the true property reinstatement cost, you’re likely to be underinsured.

The Real Risk of Underinsurance
Underinsurance remains one of the most common pitfalls in UK property insurance. It can lead to dramatic financial consequences. Most insurers include an Average Clause in their policy terms. This means if your property is insured for less than its true reinstatement cost, any claim you make could be reduced in proportion to the shortfall.
Example:
If your property is worth £500,000 to rebuild but is only insured for £375,000 (75%), any claim – even a partial one – may be settled at just 75% of the loss. That can leave you footing thousands of pounds unexpectedly.
As a surveyor, I can’t stress enough the value of commissioning …