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RAAC remediation is not suddenly easy or cheap, but the latest English hospital assessment does offer a narrower reassurance: seven hospitals built largely with reinforced autoclaved aerated concrete (RAAC) may remain operational beyond 2030 if specified mitigation, maintenance and risk controls continue. That is a managed extension of service, not proof that RAAC is safe, that permanent work can be cancelled, or that every affected building can follow the same plan.
The evidence points to a practical distinction. Mitigation can buy time where a building’s condition, use and engineering controls allow it; retaining RAAC also carries residual risk, recurring work, disruption and rising future costs. Permanent removal—through structural remediation or replacement—remains the long-term objective for many sites.
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What does the latest RAAC evidence actually say?
The most important new evidence concerns seven English hospitals in the New Hospital Programme, not every building containing RAAC. A Department of Health and Social Care assessment prepared by Mott MacDonald in December 2025 examined whether those hospitals, built between 1970 and 1983, could continue operating beyond 2030.
Its conclusion is conditional. The assessment says: “This report confirms that, with appropriate mitigation and sustained maintenance, the RAAC (reinforced autoclaved aerated concrete) 7 hospitals can remain operational beyond 2030.” The conditions are the substance of the finding: continued structural support and monitoring, control of the building environment, maintenance, surveys and risk assessment. It does not say the hospitals are risk-free or that RAAC has ceased to be a problem.
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The report also expects risk and cost to rise as RAAC is retained. In practical terms, the evidence supports a time-limited, actively managed operating strategy while permanent solutions are delivered—not a return to business as usual.
Does “operational beyond 2030” mean the hospitals are safe?
No. “Operational” means the hospitals may continue providing services under specified controls. It is not a blanket safety certification for every RAAC plank, room or future condition.
The seven hospitals contain more than 80,000 RAAC roof planks. Mott MacDonald found that typically about 1% of planks at each hospital were inaccessible for remediation, with one site reaching 6%. The report attributes this to the complexity of working in live clinical environments and the need to keep healthcare services running. An inaccessible plank is therefore not evidence that it is harmless; it is a residual item that must remain within the site’s risk-management arrangements.
Hospital mitigation is building-specific. Measures can include temporary or permanent support systems, repairing roofs to keep RAAC dry, repeated condition surveys and maintaining or replacing mechanical and electrical infrastructure. Leaks, changes in loading, deterioration of adjacent components or loss of support can alter the risk profile. Clinical departments also impose constraints that a vacant warehouse or closed school room would not.
The assessment’s wording should consequently be read as “can remain open if the controls continue to work,” rather than “RAAC is safe after all.” If a mitigation measure fails, is not maintained or no longer matches the building’s condition, the operational conclusion no longer automatically applies.
Is RAAC remediation easier than the panic suggested?
Some projects may be more manageable than the worst-case headlines implied, particularly where surveys show limited deterioration and effective support can be installed without closing the whole building. The assessment does not establish that remediation is generally easy. It shows that engineers can manage risk in complex, occupied hospitals while replacement schemes are developed.
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Working around live clinical services remains difficult. Areas may need temporary closure, decanting or carefully phased construction. Roof repairs must prevent water ingress; support work must be inspected and maintained; and services such as ventilation, power, fire systems and medical infrastructure may need alteration before a structural intervention is possible. The inaccessible-plank figures demonstrate that even a major programme may leave small areas that cannot be reached immediately.
For schools, the Department for Education’s guidance is deliberately precautionary. For specified state-funded education settings in England with confirmed RAAC, responsible bodies are advised that “Spaces should remain out of use until appropriate mitigations are in place, even where they would have been deemed ‘non-critical’ previously.” That instruction does not describe an easy workaround; it requires the responsible body to restrict access until a suitable, documented mitigation is in place.
Whether work is straightforward depends on the individual building: the condition and span of the planks, roof leaks, imposed loads, access, fire strategy, mechanical and electrical services, temporary accommodation and the consequences of closing the space. A survey finding that supports a local intervention cannot be transferred to another site without engineering assessment.
How much has it cost to manage RAAC in the hospitals?
The National Audit Office reported that more than £500 million had been spent by 2025 to mitigate the most significant risks across the seven RAAC hospitals. That is a programme-level figure for mitigation and should not be read as a total remediation bill, an average cost per hospital or proof that retaining RAAC is cheaper than replacement.
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The cited sources do not provide a universal, like-for-like comparison of the lifetime cost of mitigation against constructing replacement hospitals. A credible comparison would need to include surveys, temporary works, roof and service upgrades, repeated inspections, decanting, inflation, financing, construction and the cost of operating an ageing building. Those items vary substantially between hospitals.
The NAO also reported that the seven replacement schemes were expected to open in 2032 or 2033. Those dates are later than the latest 2030 replacement date recommended by an independent report in 2022. The delay illustrates why interim mitigation matters operationally, while also showing that it carries a longer period of exposure to maintenance and delivery risk.
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What is the difference between mitigation and permanent remediation?
Mitigation controls the immediate structural and operational risk while RAAC remains. Permanent remediation removes or replaces the affected construction, often as part of a wider refurbishment or a new building. Neither route is automatically cheaper: the right choice depends on condition, use, access, service continuity and the time horizon.
| Decision factor | Continued mitigation | Permanent remediation or replacement |
|---|---|---|
| Risk over time | Can manage risk under defined conditions, but residual risk remains and is expected to increase as RAAC is retained. | Can remove the RAAC-related structural issue in the treated area, subject to the quality and scope of the new work. |
| Up-front cost | May avoid an immediate full rebuild, but support, surveys, roof repairs and service work require substantial spending. | Usually requires a larger capital commitment and a long design, approval and construction period. |
| Ongoing cost | Requires continued inspections, maintenance, environmental control and possible additional interventions. | Reduces RAAC-specific maintenance after completion, but a new or refurbished asset still has normal operating costs. |
| Operational disruption | Phased work can keep parts of a hospital or school open, but access restrictions and decanting may continue. | Construction can cause major disruption; a completed replacement may offer more predictable operation. |
| Delivery horizon in the cited programmes | Provides time while longer projects proceed. | Hospital replacement schemes were expected to open in 2032 or 2033; school programmes have separate targets. |
The table is a decision framework, not a price comparison. The cited evidence does not support a single national cost threshold at which one option becomes financially superior.
What is happening to RAAC in English schools?
School and hospital programmes must be kept separate. The Department for Education reported that, by 10 September 2025, 52 schools had had all RAAC removed through targeted grant funding and 71 schools were in the School Rebuilding Programme. Those figures describe progress at a particular date, not completion of the national task.
In April 2026, the government said schools and colleges in England that are not being substantially rebuilt would be RAAC-free by 2029. That is a government commitment or target, not evidence that every affected space had already been cleared. It also does not mean every school will follow the same engineering sequence or receive the same temporary arrangements.
The wider condition of the school estate makes the timetable harder to interpret. The House of Commons Education Committee reported that the Department for Education estimated £7 billion a year was needed to maintain, repair and rebuild the school estate, while funding since 2020 had been £3.1 billion per year. Those figures relate to the whole estate, not RAAC remediation alone, so they cannot be used to calculate a national RAAC shortfall or a per-school cost.
For an affected school, the immediate question is whether a confirmed-RAAC space has an approved mitigation. Until then, the DfE guidance calls for the space to remain out of use. Temporary classrooms, room changes or other arrangements may preserve teaching capacity, but they do not remove the underlying structural obligation.
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Can an owner decide to leave RAAC in place?
An owner should not make that decision from a generic article, a visual inspection or another building’s outcome. Continued use requires competent structural assessment, a documented risk assessment and a mitigation and maintenance plan accepted by the responsible parties and relevant authorities.
A sensible decision sequence is:
- Confirm the material and extent. Use the building’s records and a competent survey to identify where RAAC is present, its type, span, condition and relationship to other structural elements.
- Check immediate controls. Restrict access where required, address leaks and prevent loads or alterations that have not been assessed. Follow the applicable DfE guidance for confirmed RAAC education spaces.
- Assess the whole building. Review supports, bearings, roof coverings, drainage, fire protection, mechanical and electrical services and any areas that cannot currently be accessed.
- Compare options over the intended life. Cost repeated inspections, temporary works, decanting, service upgrades and future interventions as well as the initial construction price.
- Document triggers and ownership. State who inspects, how often, what condition changes require action and who funds and delivers the response.
- Plan permanent work. A mitigation plan should include a route to removal, substantial refurbishment or replacement where that is the strategic solution, with realistic allowances for approvals and occupied-building logistics.
This process is especially important for hospitals, where a technically feasible intervention can still be unacceptable if it compromises critical care, theatres, diagnostics or evacuation routes.
What could make a mitigation plan fail?
Several failure modes recur across occupied RAAC buildings:
- Water ingress: RAAC can be vulnerable to deterioration when moisture reaches it. Roof defects and drainage failures need rapid investigation and repair.
- Unrecorded alterations: New plant, suspended ceilings, solar equipment or storage can change loads. No additional load should be assumed acceptable without structural review.
- Maintenance gaps: Supports and protective work are not “install and forget” measures. They require inspection, access and planned renewal.
- Inaccessible areas: A plank that could not be reached during live operations still needs a risk-control strategy and a plan for future access.
- Service conflicts: Mechanical, electrical, fire and medical systems may obstruct structural work or be damaged by it. Coordination must precede construction.
- Programme drift: A temporary arrangement can become indefinite if replacement design, funding or approvals slip. Milestones and escalation routes are essential.
These are reasons to strengthen governance, not reasons to assume every building requires immediate abandonment. The appropriate response is site-specific engineering backed by continuous review.
Does the evidence justify spending less on permanent replacement?
Not on its own. The hospital assessment provides a way to keep services running beyond 2030 under mitigation; it does not provide a national rule that replacement can be deferred indefinitely. The NAO’s report of more than £500 million already spent on hospital mitigation shows that interim measures can be expensive before a replacement opens.
A lower initial spend can also become a higher lifetime cost if a building needs repeated surveys, more supports, service renewal and temporary accommodation. Conversely, replacement may be disproportionate for a building with a limited remaining life or a small, well-understood RAAC area. The financially responsible choice is therefore a whole-life appraisal that includes risk, disruption and the value of service continuity.
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What should readers conclude from the “panic” question?
The latest evidence moderates the most absolute claims, but it does not reverse the underlying warning. RAAC is not a single national emergency with one deadline and one remedy. Nor is it a harmless material once a support has been installed.
For the seven English hospitals, controlled operation beyond 2030 is considered possible. For schools in England, confirmed-RAAC spaces remain subject to precautionary access restrictions until appropriate mitigation is in place, with a 2029 government target for settings not being substantially rebuilt. Hospital replacement schemes are expected in 2032–33, so mitigation and permanent delivery will overlap for years.
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The defensible conclusion is narrower: mitigation can buy time and may avoid an immediate full closure, but it does not prove remediation is easy, cheap or complete. Owners should treat every extension of use as a managed engineering decision with a funded maintenance plan and a credible route to permanent work.
Frequently Asked Questions
Can a school reopen a room after a temporary support is installed?
Only after the responsible body has confirmed that the mitigation is appropriate for that specific space and that the required inspections and controls are in place. The DfE guidance applies to specified state-funded education settings in England; other jurisdictions and building types may have different requirements.
Does the £500 million figure cover replacing all seven RAAC hospitals?
No. The NAO describes more than £500 million spent by 2025 to mitigate the most significant risks. It is not a replacement budget, a complete remediation total or a comparable cost per hospital.
Why can’t the inaccessible hospital planks simply be ignored?
Their inaccessibility reflects the difficulty of working in live clinical buildings, not proof that they are safe. They remain part of the site’s residual risk and require controls, monitoring and a plan for access or permanent treatment.
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No. The 2029 statement concerns schools and colleges in England that are not being substantially rebuilt. The 2032–33 dates refer to the seven hospital replacement schemes reported by the National Audit Office.
