The Truth About “Free” Damp Surveys – What You Need To Know

You’ve noticed damp in your home. You call a company offering a “free survey,” and they arrive with promises of expertise. Two hours later, you’re looking at a £5,000 quote for damp proofing work.

Sound familiar?

As an independent MISSE-certified damp surveyor covering Derby, Nottingham, and Leicester, I see the aftermath of “free surveys” every week. Let me explain what’s really going on.

Why Free Surveys Aren’t Actually Free

Here’s the uncomfortable truth: companies offering free damp surveys don’t make money from surveys — they make money from selling treatments, membranes, and building work. The business model is simple: offer a “free survey” to get inside your property, find (or manufacture) problems that require expensive solutions, present the problem as urgent, pressure you to book immediately, and profit from the £3,000–£8,000 treatment work. Their surveyor isn’t being paid to diagnose your problem accurately. They’re being paid to generate sales.

The Most Common Misdiagnoses

1. Rising Damp (The Cash Cow)

“Rising damp” is the holy grail of damp proofing sales. It sounds serious, requires expensive membrane systems, and most homeowners have no way to verify the diagnosis. The reality? Genuine rising damp is surprisingly rare. Research by the Building Research Establishment found that over 80% of “rising damp” diagnoses are actually leaking plumbing, poor external drainage, bridged or damaged DPCs, condensation and poor ventilation, or penetrating damp from outside.

2. Chemical Injection Damp Proof Courses

“Your damp proof course has failed — we need to inject a chemical barrier.” They drill holes every 120mm along your wall and pump in silicon-based chemicals. Cost? £2,000–£5,000 minimum. Often, the real problem is external — raised ground levels, poor drainage, or bridged cavities. Fix those (at a fraction of the cost), and the “rising damp” disappears.

3. “Dry Rot” Diagnoses

While genuine dry rot does exist and is serious, many cases are actually wet rot (much less serious), historic rot that’s been dormant for years, or minor fungal growth from a small leak. True dry rot has very specific characteristics and needs proper laboratory identification — not a quick glance designed to secure a £10,000+ remediation contract.

The Red Flags to Watch For

During the survey: they spend more time measuring walls than investigating causes; don’t check external drainage, gutters, or ground levels; no thermal imaging (just a basic moisture meter); jump quickly to “rising damp” without thorough investigation.

After the survey: quote arrives within hours; extremely expensive (£3,000+ for a standard terraced house); pressure to book immediately with “special offers”; no proper written report — just a quote with a diagram; reluctant to let you get a second opinion.

What An Independent Survey Looks Like

A genuinely independent survey starts outside: checking gutters, downpipes, ground levels, drainage, pointing, and brickwork. Internally, it uses professional thermal imaging alongside moisture meter readings, a ventilation assessment, and a discussion of lifestyle factors. The result is a full written report with thermal images, a clear diagnosis, and honest recommendations — not a sales pitch.

The Real Costs

“Free Survey” company route: free initial survey + £3,000–£8,000 for damp proofing work that often doesn’t solve the actual problem.
Independent survey route: £295–£495 for professional diagnosis + £200–£800 for the actual fix. Problem correctly identified and solved.

A Personal Mission

In November 2017 — just two months after leaving 16 years working across manufacturing, distribution, and waste disposal industries — I suffered a spontaneous pneumothorax: a collapsed lung. It happened on the same day my youngest daughter was born. I spent 10 days in hospital. The cause was never established; spontaneous pneumothorax often isn’t. But the timing made an impression. Whatever the reason, it was the moment mould, air quality, and what people breathe inside their homes became something I take personally on every survey.

This isn’t just a job — it’s personal. That’s why I built Damp Detectives Surveys as a genuinely independent service. No products to sell. No commissions. No pressure. Just honest, scientific diagnosis from someone who truly understands the risks.

What To Do If You’ve Already Had a “Free Survey”

Don’t commit immediately despite their time-limited pressure. Get an independent second opinion — it’s worth the £295 fee. Ask specific questions: what’s causing the moisture (not just where it is), why has this happened, what’s the simplest solution? Request evidence: moisture meter readings in writing, photographs, detailed explanation of the diagnosis. Check credentials: are they qualified, insured, and independent?

The Bottom Line

Free damp surveys are a marketing tool, not a professional service. If you want the truth about your damp problem, you need someone with no financial interest in the treatment. Most damp issues are simpler than you think — they just need someone to look beyond the sales pitch.

Get An Honest Answer

Based in Derby and covering Nottingham, Leicester, and the wider Midlands, Richard Bull provides genuinely independent damp surveys with no products to sell and no sales pressure.

📞 07983 550 662
📧 richard.bull@dampdetectives.co.uk
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Richard Bull MISSE, ACIEH is an independent damp surveyor and IICRC-certified technician with extensive experience investigating moisture problems across the Midlands.