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RAAC (reinforced autoclaved aerated concrete) is a lightweight concrete used in some UK buildings, including public buildings, from the 1950s to 1990. It may be found in roofs, floors or walls. A building’s age or a visual clue can justify further investigation, but neither confirms RAAC: a building surveyor or structural engineer should establish whether it is present, and a competent structural engineer should assess suspected or confirmed RAAC and advise on management. Asbestos is a separate possible hazard: it may be present in the same building and could be disturbed by a RAAC-related collapse or remediation, but that does not mean RAAC itself contains asbestos.
Guidance depends on the building and UK jurisdiction. In particular, Department for Education advice about vacating spaces with confirmed RAAC applies to the education settings in England that it covers; it is not a universal rule for every property in the UK.
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RAAC stands for reinforced autoclaved aerated concrete. It is a lightweight concrete product used in some UK buildings, including public buildings, over a period that includes the 1950s through 1990. Its use in older building stock matters because the presence and condition of a particular panel cannot be inferred reliably from the building’s age alone. A suspected panel needs professional identification and structural assessment.
RAAC may occur in floors, walls, and flat or pitched roofs. It is not limited to one building type. Schools, hospitals, housing and other buildings may warrant attention if they were constructed or modified during the relevant period, but age is a prompt to check records and seek advice—not proof that a building contains RAAC. Equally, an apparently ordinary ceiling or roof is not, by itself, evidence that RAAC is absent.
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The risk is building-specific. It depends on whether RAAC is present, the condition of the relevant panels, the structure around them and how the affected space is used. The available guidance does not establish a universal technical threshold that tells every owner when monitoring is enough or when strengthening or replacement is required. Those decisions need a competent assessment of the individual building.
Which buildings should be investigated?
Buildings constructed or modified between the 1950s and 1990 may merit consideration, particularly where records or visible clues suggest that RAAC panels could be part of a roof, floor or wall. But there is no comprehensive UK list of buildings containing RAAC, and the available sources do not establish a current UK-wide total. Surveys are needed to identify it.
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Historical figures illustrate why the issue has received attention, but they should not be mistaken for current counts. A 2024 House of Commons Library briefing reported 231 state-funded education settings as of 27 November 2023 and 45 NHS hospital sites as of 17 October 2023. These are dated figures, not a current prevalence survey, and they do not tell an owner whether a particular building contains RAAC. See the House of Commons Library briefing on RAAC in the UK for context.
Responsibilities and advice differ across the UK and by building type. The Department for Education’s identification guidance is non-statutory and aimed at responsible bodies for state-funded education estates in England; it is not a universal UK building rule. Social housing landlords have separate responsibilities and should consult current housing and safety guidance as well as professional advice. Owners and managers should check the requirements that apply to their location, property and role rather than assuming that an instruction issued for one type of estate applies everywhere.
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How do I know if a building has RAAC?
You cannot confirm RAAC reliably just by looking at a building or checking its construction date. Age, records and visual appearance can help identify a reason to investigate, but confirmation should be made by a building surveyor or structural engineer with appropriate competence.
The Department for Education’s RAAC identification guidance describes appointing a building surveyor or structural engineer to confirm whether RAAC is present. Although that guidance is written for education estates in England, the underlying distinction is important for any building: a preliminary clue is not a structural diagnosis.
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Do not inspect, probe, drill, cut or otherwise disturb a suspect structure to try to identify its material. This can create a safety risk and, if asbestos is present, potentially disturb it. The Government Office for Science’s 2024 advice note records non-invasive testing as an evidence question; it does not establish a consumer device or other quick method as a definitive way to detect RAAC. Avoid relying on an online checklist, phone app or purchased detector to settle the question.
For practical next steps, gather available building information—such as construction or alteration records, survey reports and relevant maintenance documentation—and share it with the professional engaged to assess the building. If records are incomplete, that uncertainty is a reason to obtain advice, not a basis for declaring the building safe or affected. The qualified professional can advise on the appropriate investigation and whether further assessment is needed.
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What should a building owner or manager do if RAAC is suspected?
Tell the people responsible for the building and arrange competent professional advice. HSE’s guidance for building managers says to establish whether RAAC is present, seek advice from a competent structural engineer when it is suspected or confirmed, and develop a management plan.
- Record the concern. Note what prompted it, the areas involved and any relevant construction or refurbishment information. Avoid presenting an unconfirmed suspicion as a diagnosis.
- Contact the responsible building manager or owner. For managed housing, this may be the landlord; for a workplace or public building, it may be the organisation responsible for the premises. Make sure the person with authority to arrange professional assessment is informed.
- Arrange professional confirmation and assessment. Use a building surveyor or structural engineer to establish whether RAAC is present. Where it is suspected or confirmed, HSE points managers to a competent structural engineer for assessment and management advice.
- Follow the advice for the specific setting. Decide what restrictions, monitoring, temporary measures or remedial work are appropriate with the professional and the relevant authority. Do not assume that advice for a school in England automatically governs a home, workplace or building elsewhere in the UK.
- Communicate and keep a record. Record the assessment, decisions, interim arrangements and any changes. Share relevant safety information with people who use or work on the building, including contractors who may disturb affected areas.
If the building is an education setting in England and RAAC is confirmed, the current Department for Education guidance says the affected spaces should be vacated and access restricted until appropriate mitigations are in place. That advice is specific to the settings covered by the guidance. People responsible for other properties or properties in other UK jurisdictions should check the applicable current guidance and obtain building-specific advice rather than extending this instruction without qualification. The DfE guidance for education settings in England with confirmed RAAC was updated on 20 July 2026.
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The cited HSE guidance does not say that RAAC itself contains asbestos. It warns that asbestos may also be present in a building and that a collapse or remediation activity related to RAAC could disturb it. RAAC and asbestos are distinct issues that may need to be considered together when planning work.
HSE says duty holders must identify, assess and manage asbestos risk in their premises, and share relevant information with anyone liable to disturb asbestos. That makes asbestos information important when planning an inspection, emergency response, repair or remediation that could affect suspect materials. It does not mean that every building with RAAC contains asbestos, or that the presence of asbestos can be determined from the presence of RAAC.
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Before work that could disturb building materials, the responsible parties should establish what asbestos information is available and obtain competent asbestos advice where relevant. Do not use an online checklist or a visual impression to settle the building’s asbestos status, and do not disturb suspect materials to check them. HSE’s RAAC risk-management guidance explains the relationship between these two risks and the duty to manage asbestos information.
What are the management options if RAAC is confirmed?
There is no single remedy for every RAAC panel. The House of Commons Library briefing summarizes Institute of Structural Engineers advice as condition-dependent: some cases may be suitable for monitoring, others may require remedial propping or strengthening, and some panels may need replacement. The appropriate option follows the building-specific assessment; the sources do not provide a universal ranking or a one-size-fits-all trigger.
- Monitoring: may be appropriate in some cases, based on the assessed panel condition and the professional’s management advice. Monitoring is not a substitute for a structural assessment or a plan for responding if conditions change.
- Propping or strengthening: may be needed where the assessment indicates that intervention is appropriate. The design and implementation must be based on the specific structure and managed by qualified professionals.
- Replacement: may be required for some panels. Planning needs to address the work itself, the use of the affected space while work is arranged, and any other hazards that could be disturbed.
Decisions should account for panel condition, the building’s structure and use, the intervention required, and how occupants will be protected while work is planned or carried out. Where asbestos may be present, include the relevant asbestos information and competent advice in planning. A mitigation that addresses structural concerns should not be assumed to resolve separate hazards.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What should social housing landlords and tenants know?
In a September 2023 letter, the Regulator of Social Housing told registered providers that landlords should understand whether their homes contain RAAC, make proportionate mitigation and remediation plans where needed, seek suitably qualified advice, and communicate appropriately with tenants. That letter’s prevalence language is dated and should not be treated as a current survey result.
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For tenants, a concern about a building’s age or a possible panel is a reason to contact the landlord or property manager and ask what assessment has been undertaken and what arrangements apply. A landlord’s response should be based on the property’s evidence and professional advice, not on an assumption drawn from age alone. The Regulator’s chief executive, Fiona MacGregor, wrote in the 7 September 2023 letter: “Ensuring the safety of tenants and residents should be the highest priority for every landlord.” Read the Regulator of Social Housing letter on RAAC for its advice to registered providers.
What are the main pitfalls to avoid?
- Treating age as proof. The 1950s–1990 period is relevant context, not a diagnosis. Construction or modification dates only help identify whether investigation may be warranted.
- Relying on appearance alone. Visual clues can prompt professional investigation but cannot confirm whether RAAC is present or establish structural safety.
- Assuming a universal evacuation rule. DfE’s vacate-and-restrict-access direction applies to the education settings in England covered by its guidance. Check the current authority guidance for other buildings and jurisdictions.
- Conflating RAAC and asbestos. Asbestos may be present and could be disturbed by collapse or remedial work, but that is not evidence that RAAC contains asbestos.
- Choosing a remedy before assessment. Monitoring, propping or strengthening, and replacement are possible approaches described in the parliamentary briefing; which is appropriate depends on the particular building and panel condition.
- Assuming an old prevalence figure is current. Published estate counts in the 2024 briefing refer to dates in 2023, and the sources do not establish a current UK-wide total.
For broader background and the dated estate figures, consult the House of Commons Library’s RAAC briefing. The Government Office for Science’s research-priority advice note is useful context on outstanding evidence questions, but it is not government policy or a building-specific assessment.
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Is RAAC the same as ordinary concrete?
No. RAAC is a particular lightweight reinforced autoclaved aerated concrete product. Its identification and structural assessment should be left to suitably qualified building professionals rather than inferred from a general description of concrete.
Can a phone app or detector tell me whether a roof contains RAAC?
The cited sources do not establish a consumer device or app as a definitive RAAC detector. Non-invasive methods are identified as an evidence question, so a device reading should not replace professional confirmation.
Who is responsible for telling contractors about asbestos?
HSE says duty holders must manage asbestos risk and share relevant information with anyone liable to disturb it. Building owners and managers should ensure that appropriate asbestos information and advice are available when planning work.
Is there a current UK-wide count of buildings containing RAAC?
The sources cited here do not establish one. The House of Commons Library says there is no comprehensive list and notes that surveys are needed to identify buildings with RAAC.
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