Listed building insurance has a rebuild cost blind spot
- RebuildCostASSESSMENT.com
- 7 minutes ago
- 3 min read
Only 6% of listed buildings are accurately insured, with 79% underinsured and 15% overinsured. In total, 94% were insured for the wrong amount.
The underinsurance gap is particularly stark. Listed buildings that were underinsured were covered, on average, for just 64% of their required rebuild cost.
“Listed buildings often carry rebuild cost details that are easy to underestimate from an insurance point of view,” said Johnny Thomson, Head of Strategic Planning at RebuildCostASSESSMENT.com, “traditional materials, specialist trades, heritage features, access constraints and conservation requirements can all influence the final figure. The danger is assuming that a familiar sum insured is still a reliable one.”
The findings form part of our latest listed building infographic, expanding on the wider annual property insurance data, which found that 93% of UK properties were insured for the wrong amount. Listed properties show high levels of underinsurance in the wider market picture.
Listed flats show how quickly the gap can appear
A closer look at listed flats shows where the risk becomes especially sharp: lower sums insured do not always mean lower exposure.
Across the listed flats we assessed, 90% were insured inaccurately, with 77% underinsured, and 13% overinsured. Underinsured listed flats were covered, on average, for 67% of the required rebuild cost.
The most concerning figures sit within the £250,000–£750,000 sum insured band. In this band, 98% of listed flats were underinsured and 2% were accurately insured.
Concerning, yes, but it is a useful warning for brokers. You’d be forgiven for assuming that smaller sums insured can feel less exposed because the numbers are lower. However, the data suggests the opposite can be true. The gap may be easier to miss because the policy looks modest, familiar and manageable.
For property owners and managing agents, flats can also involve shared structures, communal areas, retained features and multiple parties relying on the same insurance figure. A single inaccurate rebuild cost can therefore affect more than one stakeholder.
Why listed building rebuild costs are easier to misread
A listed building rebuild cost is not simply a standard rebuild cost with a heritage label attached.
Older construction, traditional materials, decorative features, specialist repair methods, access limitations and conservation requirements can all change the reinstatement picture. Two properties with similar floor areas can need very different rebuild approaches.
A sum insured may also have been carried forward over several renewals. Indexation can move a figure each year, but it cannot test whether the starting point was right.
London does not escape the listed building problem
The London data reinforces the same point from a regional angle, but with a sharper finding in the lower sum insured band.
Across the London listed building assessments, 92% were insured inaccurately, with 79% underinsured and 13% overinsured. Underinsured London listed buildings were covered, on average, for 64% of their required rebuild cost.
In the £250,000–£750,000 sum insured band, 96% of London listed buildings were underinsured and 4% were overinsured. Not one was accurately insured.
That zero is the number brokers may want to pause on.
London properties can appear well protected because the sums insured often look substantial. Yet even in this lower band, our data found no accurately insured listed buildings. Access constraints, neighbouring properties, heritage features and project complexity can all affect reinstatement costs.
A better broker conversation starts with the basis of the figure
The useful question is not whether the sum insured looks high enough. It is how the figure was reached.
For listed buildings, brokers may want to ask when the rebuild cost was last properly assessed, whether the figure reflects listed status, whether flats or shared areas have been accounted for correctly, and whether location-specific constraints could affect reinstatement.
Overinsurance should stay in the conversation too. Our wider listed building data shows overinsured properties were covered, on average, for 123% of their rebuild cost. Accuracy supports better conversations in both directions.
“The strongest insurance conversations are based on evidence. With listed buildings, that evidence is especially valuable because the risk often sits in details that do not appear neatly on a renewal schedule.” Johnny added.
Our listed building infographic shows more than a general underinsurance problem. It shows where the risk can hide: in lower sum insured bands, listed flats, regional complexity and historic details that are easy to overlook.
A rebuild cost assessment gives brokers and property owners a clearer basis for the sum insured. For listed buildings, that clarity is not just helpful. It is the difference between a familiar number and a defensible one.
View the listed building infographic now:
