The £15.9 Billion Question: What the Backlog Figure Actually Measures
The NHS maintenance backlog has reached £15.9 billion. The 28% jump in high risk backlog in a single year is being cited as evidence of accelerating crisis. Before you build a capital case, price an FM contract, or design a procurement framework on those numbers, read what they actually measure.
£15.9b
ERIC backlog 2024/25
£37b
Darzi capital shortfall
28%
High risk jump (1yr)
The number everyone quotes and almost nobody interrogates
In October 2025, NHS England published the 2024/25 ERIC data. High risk backlog reached £3.5 billion, up 28% in a single year. The total cost of running the NHS estate in 2024/25 was £14.0 billion, meaning the backlog now exceeds annual running costs.
"£15.9 billion is the cost of controlled decay, not recovery. It measures what is needed to stop the estate getting worse. Not what is needed to make it fit for modern healthcare."
Condition B: the definition that changes everything
The ERIC backlog is defined by NHS England as the investment needed to restore buildings to a defined condition based on assessed risk. That defined condition is Condition B—the minimum acceptable standard. It is not "good" condition; it is the floor below which the estate cannot fall without direct risk to patients.
Lord Darzi's 2024 review identified a £37 billion capital investment shortfall. The ERIC £15.9 billion and the Darzi £37 billion are measuring different things. The ERIC figure is the cost to minimum standard. The Darzi figure reflects the cumulative historic underinvestment.
FM suppliers pricing long-term NHS contracts against ERIC backlog data need to model the rate at which moderate and significant risk assets are degrading into high risk. The reactive demand in years three and four may be substantially higher than the day-one ERIC figure suggests.
The survey shelf life problem
The ERIC backlog figure is only as current as the condition survey it is based on. NHS England recommends regular surveys but does not mandate a specific frequency. A trust reporting 2024/25 ERIC data might be using condition data from a survey carried out in 2019.
| The ERIC headline | The reckoning |
|---|---|
| £15.9 billion backlog | Measured to Condition B minimum standard only. Excludes cost of Condition A restoration. |
| 28% High Risk Increase | Partly real deterioration, partly Condition C assets degrading as investment clears the top tier. |
| 145% growth (6yrs) | Combines physical decline with methodology maturation. Not a direct year-on-year comparison. |
| Self-Reporting | Reported by the same organizations whose capital allocation depends on these figures. |
What this means for you
If you are an NHS estate director, your ERIC score is now directly shaping your funding. But the backlog figure you present to your board is a Condition B floor. Your board should understand what it would cost to reach genuine fitness for purpose.
If you are an FM supplier, the ERIC backlog figure does not tell you what an independent survey would find. Both matter for pricing reactive demand.
For deeper insights, view The BCIS Intelligence Series or contact our team for bespoke NHS estate intelligence.
NHS FM procurement or estate strategy?
Baachu Rain tracks 11,000+ contracts worth £49.2 billion. Our intelligence sits in the layer ERIC cannot reach.
Contact: hello@baachu.com | baachurain.com