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Practice noteTest when the cause is unclear, disputed, or when a decision depends on the answer; skip it when the problem is visible and the fix is obvious.
Testing is a diagnostic, not a ritual. If mould is growing under a leaking sink, a laboratory report tells you nothing you cannot see.
How it is done
- Worth it: recurring symptoms with no visible cause
- Worth it: before buying or renting a property
- Worth it: to confirm remediation actually worked
- Not worth it: where the cause is visible and the repair obvious
Why it matters
A company that tests everything and always finds something is selling reports. We would rather tell you a test would not change the decision.
Asked about this
Where the situation warrants it, yes. Post-remediation verification is the part most often skipped.
As an indicator, sometimes. For anything you intend to act on or dispute, laboratory analysis with a chain of custody is the standard.
Background reading
- Indoor air quality — Wikipedia
- Sampling (statistics) — Wikipedia
