Is RAAC strengthening cheaper than replacement?

In most cases, yes, and by a wide margin. Across the RAAC tenders we cost, a bespoke scheme tailored to that exact roof frequently comes in well below 15 per cent of the cost of replacement. On one tender, a roof costed at around 40 million pounds to replace was priced for strengthening at under 4 million pounds.

Is strengthened RAAC as safe as replacement?

Where a structural assessment supports strengthening, the result is a permanent solution designed to the required capacity and signed off by a chartered structural engineer. It adds decades of safe service life without the disruption of replacement.

When should RAAC be replaced rather than strengthened?

Where panels are too deteriorated, where bearings cannot be made adequate, or where an assessment concludes the element cannot be saved. The choice should follow the engineering, so every case is assessed individually.

Can you strengthen RAAC without closing the building?

Usually, yes. Because CFRP is applied in place, work can be staged around the building in use and concentrated in quieter periods, so occupants are not decanted.

RAAC Remediation vs Replacement

When RAAC is confirmed, owners are usually steered towards replacement: prop, take the area out of use, then strip out and rebuild the roof. There is another way. This page compares replacement with in-place strengthening on the things that actually matter, cost, programme and disruption.

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Why replacement is the costliest option

Replacing a RAAC roof means stripping out the existing structure, providing temporary support and weatherproofing, and rebuilding, often while the building is closed or decanted. For a school that can mean portacabins and pupils taught off site; for a hospital, lost clinical capacity; for any owner, a multi-year programme and a bill to match.

Why strengthening usually wins

Cost: typically a fraction of the cost of stripping out and rebuilding.
Programme: weeks or months rather than years, with work staged around use.
Disruption: the building stays open, with no decant to temporary accommodation.
Service life: a permanent, moisture-immune CFRP solution adds decades of safe life.

The proof

Across the RAAC tenders we cost, a bespoke CFRP scheme engineered for that exact roof frequently comes in at well below 15 per cent of the cost of full replacement. On one tender, a roof costed at around £40 million to replace was priced for strengthening at under £4 million, with no decant and a programme measured in months rather than years. See our full tender track record.

When replacement is still the right call

Strengthening is not always possible. Where panels are too far gone, where bearings cannot be made adequate, or where a structural assessment concludes the element cannot be saved, replacement is the right answer. The honest position is that the choice should follow the engineering, which is exactly why every case is assessed individually before we recommend a route.

Engineered by named RAAC specialists

Every scheme is designed and signed off by John Staves (CEng FIStructE), one of the UK’s most highly regarded RAAC structural engineers, working from the survey, scanning and monitoring of Neil Smuts (MCIOB, MInstNDT), President of the UK Concrete Scanning Standard. Meet the team.

Frequently asked questions

Is RAAC strengthening cheaper than replacement?: In most cases, yes, and by a wide margin. Across the RAAC tenders we cost, a bespoke scheme tailored to that exact roof frequently comes in well below 15 per cent of the cost of replacement. On one tender, a roof costed at around 40 million pounds to replace was priced for strengthening at under 4 million pounds.
Is strengthened RAAC as safe as replacement?: Where a structural assessment supports strengthening, the result is a permanent solution designed to the required capacity and signed off by a chartered structural engineer. It adds decades of safe service life without the disruption of replacement.
When should RAAC be replaced rather than strengthened?: Where panels are too deteriorated, where bearings cannot be made adequate, or where an assessment concludes the element cannot be saved. The choice should follow the engineering, so every case is assessed individually.
Can you strengthen RAAC without closing the building?: Usually, yes. Because CFRP is applied in place, work can be staged around the building in use and concentrated in quieter periods, so occupants are not decanted.

RAAC in your building or estate?

Tell us about the building and any survey already done, and our named RAAC specialists will advise whether strengthening can keep it open and avoid replacement.