Why it appears so often

RICS surveyors can only complete a visual inspection. They cannot open walls or lift floors, so when moisture is suspected, they must advise a specialist damp and timber investigation. This follows the RICS Home Survey Standard (2019, § 3.4 and 4.9) and joint guidance on moisture in traditional buildings with the PCA. 

Likely minor

• Minor condensation, isolated staining, or readings taken near cold surfaces.

• Older solid-wall houses often show background dampness without structural failure.

• These findings usually require improved ventilation or local repairs, not major works.

Potential red flags

• Visible mould, salts, flaking plaster, or persistently high moisture meter readings.

• Damp linked to leaks, defective rainwater goods, or bridged ground levels.

• References to “further investigation required”.

What to do next

• Instruct an independent PCA-accredited damp surveyor (not a contractor selling treatments).

• Expect £250 – £400 for a diagnostic report.

• Ask for moisture mapping and cause-based recommendations.

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Disclaimer

This article provides general guidance only and should not replace professional surveying advice. Always consult qualified specialists (CSRT-qualified damp surveyors, PCA members, or RICS surveyors) for property-specific recommendations.

The cost estimates provided are typical ranges (excluding VAT) as of October 2025 but vary significantly by region, property type, and scope of works. Always obtain written quotes for your specific circumstances.

We are not liable for decisions made based on this information. Property purchase is a significant financial commitment - seek independent professional advice appropriate to your situation.