5 Common Damp Proofing Specialist Problems and When to Call a Professional

The problems that come up most

These are the jobs damp proofing specialists are most commonly booked for. Catching them early almost always costs less:

• tide marks and salting on ground-floor walls
• black mould in corners and behind furniture
• peeling plaster and wallpaper at skirting level
• a musty smell in a cellar or basement
• damp patches appearing after rain

What you can safely check yourself

Before calling anyone, gather information: when the problem started, whether it's getting worse, and clear photos. This helps a professional give you a realistic first assessment and helps you describe the job accurately when collecting quotes.

Basic observation is always safe; DIY repair is not always. If the problem involves gas, electrics, working at height or the structure of your home, stop at observation and call a professional.

Signs it's time to book someone

Book a professional when the problem is getting worse, when it involves safety, when your own attempts haven't held, or when you simply don't know the cause. A correct diagnosis is usually cheaper than a wrong repair.

For context on cost: A damp survey typically costs £100–£250 (often free from treatment companies, which creates a sales conflict). Chemical damp proof course injection runs £50–£90 per metre; full treatment of a room £800–£2,000 including replastering.

Choosing who to call

Look for Property Care Association members and surveyors holding the CSRT (Certificated Surveyor in Remedial Treatment) qualification. An independent survey you pay for removes the incentive to find work.

Check recent reviews before booking — Hammerscore company pages for damp proofing specialists combine ratings from several platforms, and the low-star reviews tell you most about how problems were handled.