If your consultant has mentioned “pleural plaques” or “pleural thickening,” it is easy to assume they mean the same thing. They do not. The two conditions look similar on a chest scan and both point to historic asbestos exposure, but UK law treats them very differently.
This guide explains what each one is, why one is generally compensable and the other is not, and what to do if you believe your breathing problems are linked to a job you did decades ago.
What are pleural plaques in plain English?
The pleura are the two thin layers of tissue that line the outside of your lungs and the inside of your chest wall. Asbestos fibres that lodge in the pleura can cause patches of scar tissue to form on these layers. Those localised patches are pleural plaques.
Plaques are usually small, well-defined, and asymptomatic. They do not normally cause breathlessness, chest pain, or any reduction in lung function. They are best thought of as a permanent marker on the X-ray showing that asbestos fibres reached the lungs.
What is pleural thickening?
Pleural thickening is something different. When the scarring is widespread rather than patchy, and the layers of the pleura become diffusely thickened, it is called diffuse pleural thickening, or DPT.
Unlike plaques, DPT can stop the lungs from expanding properly. People with DPT often experience progressive breathlessness on exertion, a tight or heavy feeling in the chest, and reduced exercise tolerance. On a scan, radiologists look for a continuous sheet of thickening, and in particular for the obliteration of the costophrenic angle (the sharp corner where the diaphragm meets the chest wall).
Why does UK law treat them so differently?
This is where many people get caught out. The leading case is Rothwell v Chemical Insulating Co Ltd [2007] UKHL 39. In that decision, the House of Lords held that asymptomatic pleural plaques are not, on their own, a compensable injury under English law. The reasoning was that plaques alone do not cause pain, disability, or harm to lung function.
The position is different in Scotland, where statute reversed Rothwell, but in England and Wales pleural plaques generally do not give rise to a civil claim.
Diffuse pleural thickening sits on the other side of the line. Because DPT can genuinely restrict breathing and limit daily life, it is treated as an actionable injury and can be the basis of a successful civil claim, provided the medical and exposure evidence is there.
What evidence is needed for a pleural thickening claim?
A claim for diffuse pleural thickening generally needs three things to come together:
- A clear diagnosis. Usually a chest X-ray followed by a CT scan, interpreted by a consultant with experience in occupational lung disease.
- Functional impairment. Lung function tests (spirometry, and often lung volume and gas transfer testing) showing a measurable restrictive pattern, typically with a reduction in forced vital capacity (FVC) of around 10 to 20 per cent or more, depending on the wider clinical picture.
- An exposure history. A credible account of where, when, and how you were exposed to asbestos at work, including the names of employers where possible.
If asthma, smoking, or another lung condition is also in the picture, an independent respiratory specialist will untangle how much of the breathlessness is attributable to the DPT.
Which industries were most at risk?
Diffuse pleural thickening is most often seen in people who worked in trades where asbestos was routinely cut, lagged, or stripped out:
- Thermal insulation engineers (laggers)
- Boilermakers, platers, and shipyard fitters
- Carpenters and joiners working with asbestos insulation board
- Electricians and plumbers running services through asbestos-clad voids
- Power station and railway workshop engineers
- Telecommunications engineers (BT and former GPO exchange and cable work)
- Demolition and refurbishment workers
Office workers, teachers, and council building staff can also have been exposed if asbestos was disturbed during routine maintenance over many years.
What if I was exposed by more than one employer?
This is common, especially in trades where workers moved between contractors. UK courts apply a material contribution test in asbestos cases. If each of several employers exposed you to enough asbestos to materially contribute to your condition, a claim can usually be pursued against more than one of them (or, more often in practice, against their historic insurers).
Where an employer has closed down or been dissolved, WE Solicitors traces the historic insurer through the Employers’ Liability Tracing Office and Companies House records.
What about the “date of knowledge” rule?
Under Section 11 of the Limitation Act 1980, civil claims for personal injury must usually be brought within three years. The clock starts at the date of knowledge, which Section 14 defines as the point at which you first knew, or could reasonably have known, that your injury was significant and connected to a workplace cause.
For diffuse pleural thickening, that is usually the day a consultant explains the diagnosis and tells you it is linked to asbestos exposure.
If the three-year window has already closed, Section 33 of the Limitation Act 1980 gives the court a discretion to allow the claim to proceed where it is fair to do so. The earlier you take advice, the wider the options.
How does Industrial Injuries Disablement Benefit fit in?
The Department for Work and Pensions recognises diffuse pleural thickening as Prescribed Disease D9. If you are diagnosed and meet the threshold, you may be entitled to Industrial Injuries Disablement Benefit (IIDB). IIDB is a no-fault state benefit, so you do not need to prove that an employer was negligent.
A civil claim against the responsible employer or its insurer is a separate matter and can run alongside IIDB. An IIDB award can also help the civil case, because it confirms that the DWP accepts the disease as work-related, which strengthens the evidential picture.
Why provisional damages can matter
Pleural disease can progress. Someone with diffuse pleural thickening today may, in some cases, go on to develop a more serious asbestos-related condition years later. UK courts can award provisional damages in these cases, which means the claim is settled now for the current condition but the right to return to court is preserved if a more serious disease develops in future.
You can read more about the provisional damages approach on our pleural thickening claims page.
Why early advice matters
In the words of Senior Partner Steve Evans:
In practice, the sooner WE Solicitors hears from you after a diagnosis, the more options remain on the table: tracing employers and insurers while records are still intact, instructing the right respiratory specialist early, and protecting the limitation position before time becomes a problem.
Frequently asked questions
I have been told I have pleural plaques but no other symptoms. Can I claim?
In England and Wales, plaques alone are not usually compensable as a civil claim following Rothwell. You may still be entitled to Industrial Injuries Disablement Benefit, and if your condition changes the position can be reviewed. It is worth taking advice if you are unsure.
My doctor says my lung function is reduced. Does that automatically mean I can claim?
Not automatically. The reduction has to be linked to diffuse pleural thickening rather than another condition, and there has to be evidence of negligent asbestos exposure at work. A specialist solicitor will help work out whether the picture fits a claim.
How long does a pleural thickening claim usually take?
Most claims settle within a year or two, depending on how complex the exposure history is and whether more than one employer is involved. WE Solicitors will give you a realistic timeline at the initial consultation.
Will I have to attend court?
Most pleural thickening claims settle through negotiation with the insurer and never reach a court hearing.
Does it cost anything to find out where I stand?
No. The initial consultation is free, and WE Solicitors handles pleural disease claims on a No Win, No Fee basis. There is no fee if the claim is unsuccessful.
Speak to WE Solicitors
If you have been diagnosed with pleural thickening, or you have been told you have pleural plaques and you are worried about what comes next, a free conversation costs nothing and carries no obligation. Call 0800 294 3065 or use our online contact form. One of our specialist solicitors will listen, ask the right questions, and tell you honestly whether there is a claim worth pursuing.
Sources: HSE, Asbestos-related disease statistics, Great Britain 2025 · Rothwell v Chemical Insulating Co Ltd [2007] UKHL 39 · Limitation Act 1980, Sections 11, 14 and 33 · Control of Asbestos Regulations 2012 · DWP, Prescribed industrial diseases D9 (diffuse pleural thickening) · Fishwick & Barber, “Non-malignant asbestos-related diseases”, Clinical Medicine, 2014 · Robinson et al., “Clinical consequences of asbestos-related diffuse pleural thickening”, Clinical Medicine, 2008.
