Why mould grows
Mould can grow where moisture is present for long enough. Common contributors include leaks, condensation, poor ventilation, cold surfaces, flood events, damaged materials, and unresolved damp.
Why visual inspection is not always enough
Visible mould tells part of the story, but it may not show the extent of contamination, the condition after cleaning, or whether an air sample suggests wider exposure. Testing can support clearer records.
What testing adds
Selected surface and air samples can help document fungal or bacterial load in specific places at a specific time. Results should be read with site observations, photographs, moisture readings, ventilation context, and repair history.
Testing is not a replacement for urgent repairs, medical advice, or statutory housing decisions. See Testing Compliance for report boundaries.