A damp proofing specialist investigates and treats moisture problems in buildings - diagnosing the cause (rising damp, penetrating damp or condensation) and specifying the appropriate remedy. This is a field where misdiagnosis is common and expensive; an independent survey from a PCA-qualified specialist is strongly recommended before any treatment works are commissioned. The Property Care Association (PCA) is the industry's trade body and its CSRT qualification is the key quality indicator to look for.
What they do
- Investigate and diagnose the cause of damp - rising, penetrating or condensation
- Produce a damp survey report with photographs and recommendations
- Install chemical damp proof course (DPC) injection
- Remove and replace salt-contaminated plaster with renovation plaster
- Apply basement tanking and waterproofing membrane systems
- Treat timber for woodworm, wet rot and dry rot
- Install cavity drainage membrane systems in basements and cellars
- Improve ventilation to address condensation problems
- Advise on external waterproofing and pointing repairs
- Issue guarantees for treatment work (typically 20-30 years)
When you need one
Damp problems rarely resolve themselves. Early investigation prevents structural damage and costly remediation.
Typical costs (UK, 2025)
| Job type | Typical cost |
|---|---|
| Damp survey and report | £500 - £1,000 |
| DPC injection (per metre) | £80 - £200 / m |
| Ground floor treatment (full) | £1,500 - £4,000 |
| Basement waterproofing membrane (per sq m) | £80 - £150 |
| Replastering after treatment (per room) | £800 - £2,000 |
| Woodworm treatment (per room) | £200 - £500 |
Replastering is often the largest element of a damp treatment project - factor it in from the start. Guarantees on treatment work (typically 20-30 years) are only as good as the company issuing them; check the contractor is a long-established PCA member.
Qualifications to look for
The primary qualification for damp and timber surveyors in the UK. Awarded by the Property Care Association, it requires both written examination and practical assessment. Check at pca.org.uk.
A complementary PCA qualification specifically covering timber decay and damp investigation in buildings.
The key quality indicator for this trade. PCA members must meet minimum standards, carry insurance and comply with a code of conduct. Find members at pca.org.uk.
How to find a reputable damp proofing specialist
Frequently asked questions
Is rising damp real?
Yes - but it is frequently over-diagnosed. Condensation and penetrating damp are far more common and less expensive to treat. An independent PCA survey (not from a contractor who also quotes for treatment) gives an unbiased assessment. Always get a survey from a CSRT-qualified specialist before committing to treatment.
How long does DPC injection last?
A correctly installed chemical DPC injection typically lasts 20-30 years. The replastering with salt-resistant renovation plaster is as important as the injection itself - the old plaster will be contaminated with hygroscopic salts and must be removed and replaced for the treatment to work.
How do I choose a damp specialist?
Always use a PCA member - the Property Care Association is the industry trade body and its CSRT qualification requires demonstrated competence. Find a PCA member at pca.org.uk. Avoid firms that offer a free survey and then quote for treatment - use an independent surveyor for diagnosis.