1. Qualifications have limits
The UK has no single universal statutory licence covering every damp, mold and indoor-environment investigation or remediation activity. Training routes vary greatly and some introductory certificates may be obtained after only a few days. Course length alone neither proves nor disproves competence.
Check relevant experience, professional membership, insurance, scope of competence, methods, equipment, laboratory arrangements, conflicts of interest and examples of comparable work. Confirm that the person understands both building conditions and exposure control, without asking them to diagnose illness.
2. Search position is not competence
High search-engine placement, paid advertising, reviews and confident website claims can be useful for finding suppliers, but they are not evidence of technical competence or independence. Ask for the basis of every material claim and verify important credentials with the awarding organisation.
3. Read the appointment and contract
A contractor working for a landlord, insurer or other duty holder may be instructed only to answer a narrow contractual question. That scope may not match the occupant's health concerns or identify every exposure pathway. Ask to see the inspection purpose, exclusions, access limits, sampling plan, success criteria and reporting route.
Independence can be weakened when the same party defines the problem, performs the work and certifies its own result. Separate assessment, remediation and verification where risk, vulnerability or dispute makes that proportionate.
4. Require data-driven evidence
A useful plan states the starting condition, evidence gaps, target condition, actions, measurement methods, limitations and acceptance criteria. Photographs and visual cleanliness are useful but may not be sufficient by themselves.
- Define what is being investigated and why.
- Record moisture, building conditions, contamination indicators, chronology and occupant vulnerability where lawful and relevant.
- Set practical targets before work begins.
- Control spread during work and document deviations.
- Use an appropriately independent person to verify the agreed outcome.
5. Questions to ask
- Who is your client and who can rely on your report?
- What is outside your scope?
- Which standards and evidence support your method?
- How will you protect occupants and prevent cross-contamination?
- What measurable result defines completion?
- Who will perform independent verification?