Damp and mould are some of the most common — and concerning — issues flagged during property surveys. If left untreated, they can cause structural damage, pose health risks, and lead to costly repairs. As a homebuyer or homeowner in North Wales or Cheshire, understanding how to spot the signs, what causes damp, and how to deal with it is essential.
What Is Damp?
“Damp” refers to excess moisture within a building. This can come from water ingress, poor ventilation, rising ground moisture, or even lifestyle factors (like drying clothes indoors). There are three main types of damp:
Low-level damp (often labelled “rising damp”) – True rising damp is uncommon; low-level moisture is more often linked to bridging, high external ground levels, leaks or impermeable finishes.
Penetrating Damp – Rain or moisture seeping through walls, roofs, or windows.
Condensation Damp – Caused by everyday activities creating moisture that can’t escape.
Why Is Mould a Problem?
Persistent damp often leads to mould growth, which can harm air quality and health — especially for children or the elderly. Mould signals deeper structural or ventilation issues that may lower a property’s value.
Common Signs of Damp and Mould
- Musty smell in corners or cupboards
- Dark patches on walls or ceilings
- Peeling wallpaper or bubbling paint
- Black mould near windows or bathrooms
- Discoloured skirting boards or floors
- Walls that feel damp or cold
Can a Building Survey Identify Damp?
Absolutely. A RICS Level 2 or Level 3 survey can identify damp and mould issues — even hidden ones. At LEM Building Surveying, we use moisture meters, thermal imaging, and our local knowledge to assess cause and severity, helping you make informed decisions.
What Can Be Done About It?
Solutions depend on the cause:
- Condensation: Improve ventilation, use extractor fans.
- Penetrating damp: Repair external faults like leaks or cracks.
- Low-level damp (often labelled “rising damp”): Remove bridging, correct ground levels, repair rainwater goods and improve drainage/ventilation; avoid “quick-fix” injections without evidence.
In all cases, prevention is cheaper than cure — and acting early is crucial.
Local Insight
In areas like Chester and Flintshire, older terraces often suffer low-level damp often blamed on “rising damp”, commonly driven by bridging and external defects. In Wrexham, we see condensation damp in 1950s homes due to poor ventilation. Our local expertise allows us to recommend realistic, area-specific solutions.
Final Thoughts
Damp and mould can seriously affect property health and value. If you’re buying or selling and want peace of mind, a professional survey is essential.
For deeper insight, schedule our damp & timber investigations, review the damp and mould action plan checklist, and see how a RICS Level 3 Building Survey documents broader structural risks alongside moisture concerns.
Need expert advice? Contact LEM Building Surveying for a free quote or to book a damp inspection.