The hidden balance-sheet exposure gap
7.1 True liability
The hidden balance-sheet exposure is the gap between what property owners think their assets will cost to maintain, insure and repair, and the true liability created by underinsurance, ageing stock, deferred maintenance, climate risk, regulatory deadlines and a constrained repair market.
Underinsurance and reinstatement gaps
Values that have not kept pace with repair inflation, specialist materials, heritage constraints or modern compliance costs.
Deferred maintenance and repair backlogs
Especially in the public sector, housing and ageing estates, where unresolved defects can become larger claims or statutory failures.
Ageing stock complexity
Older construction types that take longer and cost more to repair because of drying times, specialist labour, asbestos, conservation issues or obsolete materials.
Climate-driven latent exposure
Flood, subsidence, storm and escape-of-water risks that may be known in principle but not properly mapped asset by asset.
Regulatory capital pressure
Building safety, Awaab’s Law, MEES / EPC and retrofit obligations that compete with claims spend for the same budgets.
Repair capacity risk
The financial impact of longer reinstatement periods, contractor scarcity, price inflation and business interruption when surge events hit.
Asset-value and insurability risk
Properties becoming harder to insure, more expensive to finance, less attractive to investors or potentially stranded if risk and compliance evidence is weak.
Underinsurance is no longer a technical valuation issue, but a strategic risk that can determine whether an asset recovers quickly, becomes financially distressed, or loses value after a major event.
7.2 The evidence
Underinsurance is systemic in the UK. Valuations undertaken by Sedgwick on £3.09bn of properties – 91% commercial, 9% ultra-high value (stately homes, large domestic property portfolios) – from January to August 2026 revealed:
These statistics are generally supported by RebuildCostASSESSMENT.com data for 2026:
UK assessments
accurately insured
underinsured and 25% overinsured
Combined valuation gap. (£15.61bn underinsurance; £4.51bn overinsurance)
above comparable 2025 data
ACT NOW Has the rebuild-cost assessment for any asset been revalued in the last three years? Do you know the profile for every asset you hold?
The gap between what a building is insured for and what it would actually cost to put right is the biggest hidden exposure. Unless rebuild values keep pace with repair inflation, every claim starts from the wrong number.”
Dominick Ewing Valuations Manager and Senior Valuation Surveyor, Sedgwick
