How to Write a Professional Mould Survey Report

Start with a clear, non-technical summary that any reader can understand. This should include:

• ·Property address and date of inspection
• ·Who commissioned the survey and why
• ·Summary of key findings (areas affected, severity level)
• ·Primary cause(s) identified
• ·Recommended action and urgency level

Many clients, especially housing officers managing large portfolios, will read the executive summary first and may not read further unless something catches their attention. Make it count.

Mould is a symptom: moisture is the cause. Your report should document moisture conditions throughout the property, not just where visible mould is present. Include:

• ·Moisture meter readings: document readings from walls, ceilings, floors, and around windows. Note the equipment used and calibration status.
• ·Relative humidity: ambient RH readings in affected and unaffected rooms, ideally over a period if data loggers are available.
• ·Temperature readings: surface temperatures (particularly cold spots using thermal imaging) and ambient air temperatures.
• ·Dew point analysis: where surface temperatures fall below the dew point, condensation is inevitable; this is critical for identifying condensation-driven mould.
• ·Moisture maps: a visual floor plan showing moisture readings across the property helps clients understand the extent of the issue at a glance.

Photographs are essential, both for documenting the current condition and for comparison after remediation. Best practice includes:

• ·Wide shots showing the room context
• ·Close-up shots of mould growth with a measurement reference
• ·Thermal images showing cold bridging or moisture patterns
• ·Photos of moisture meter displays showing readings
• ·Images of potential causes (leaking pipes, failed DPC, missing ventilation)

Every photograph should be captioned with the location, what it shows, and why it matters. Uncaptioned photos add pages but not value.

This is arguably the most important section. Mould will return if the root cause isn't addressed. Your analysis should consider:

• ·Condensation: poor ventilation, thermal bridging, lifestyle factors, inadequate heating
• ·Penetrating damp: roof defects, failed flashing, cracked render, defective pointing
• ·Rising damp: failed or absent damp proof course (though true rising damp is far less common than often claimed)
• ·Plumbing leaks: hidden pipe leaks, failed seals, overflow issues
• ·Construction defects: missing insulation, cold bridging at structural junctions, inadequate ventilation provision

Be specific about which cause applies and how you arrived at your conclusion. If you cannot determine the root cause from a visual survey alone, say so, and recommend further investigation rather than guessing.

Your report should categorise the contamination level, typically aligned with recognised industry categories:

• ·Condition 1 (Normal): typical background levels, no active mould growth visible
• ·Condition 2 (Settled Spores): elevated spore levels or settled spores on surfaces, but no active colonisation
• ·Condition 3 (Active Growth): visible, active mould colonisation on building materials

Additionally, document the approximate area of affected surfaces in square metres. This helps scope the remediation work and produces defensible cost estimates.

Your recommendations should be specific, prioritised, and proportionate. Structure them as:

• ·Immediate actions: anything required to protect health or prevent further damage (e.g., ventilation improvements, temporary dehumidification)
• ·Remediation works: specific scope of mould remediation required, referencing appropriate methods and standards
• ·Root cause resolution: building repairs, ventilation installation, insulation upgrades, or other works needed to prevent recurrence
• ·Monitoring: post-remediation verification requirements and ongoing monitoring recommendations