Damp Survey for Homeowners — What to Expect

Damp patches, black mould on walls, a persistent musty smell, peeling wallpaper or tide marks on plaster — if you’ve noticed any of these, you’re in the right place. Damp Detectives provides independent professional surveys for homeowners who want to know what’s actually causing the problem.

Why get an independent survey?

Many damp surveys are offered free by companies who sell remediation products — injected DPCs, waterproof renders, chemical treatments. Their free survey often leads to an expensive recommendation for treatments that may not address the real cause.

An independent survey has no product to sell. The surveyor’s only job is to identify what’s causing the damp and tell you what the proportionate solution is — which is often far simpler and cheaper than a full treatment package.

What causes damp in homes?

Condensation is the most common form of damp in UK housing. Warm, moist air from cooking, showering and breathing condenses on cold surfaces — window reveals, external walls, corners — when those surfaces drop below the dew point. The solution is usually improved ventilation and heating, not chemical treatment.

Penetrating damp is driven by rainwater entering through the building fabric — failed pointing, cracked render, defective gutters or downpipes, a poorly sealed window frame. The fix is identifying and repairing the entry point.

Rising damp (genuine rising damp from ground moisture, capillary action through masonry) is rarer than the damp proofing industry would have you believe, and it has specific diagnostic indicators. Many walls diagnosed as “rising damp” are actually condensation, penetrating damp, or salt contamination from an old defective DPC.

What a Damp Detectives survey involves

• Visual inspection of the affected areas inside and outside the property
• Calibrated moisture meter readings to map the extent and profile of damp
• Temperature, relative humidity and dew point measurements room by room
• Assessment of ventilation provision against UK Approved Document F standards
• Checking for structural causes — gutters, pointing, render, roof details, ground levels
• Written report with identified cause, severity, and clear recommendations

What you’ll get

A written survey report covering: findings room by room, psychrometric data (temperature, humidity, dew point), moisture readings, cause of damp, and specific recommendations. The report is yours — you can share it with a builder, a landlord, a solicitor or a mortgage lender.

Try our free self-diagnosis tool first

Not sure whether you need a survey? Our free Damp Self-Diagnosis Tool walks you through the common symptoms of condensation, mould and structural damp and gives you a first-pass assessment based on what you’re seeing. It takes about 5 minutes.