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Fumes Investigation Report (CP26)

A CP26 is completed when a Gas Safe registered engineer investigates a report of gas fumes or carbon monoxide in a property. It documents the investigation findings, CO readings, appliance testing, and any actions taken including disconnection or classification of appliances. The report provides a formal record of the incident and the engineer response.

Gas Safety (Installation and Use) Regulations 1998, GIUSP IGEM/G/11Valid: One-off (issued per incident)

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Sample CP26 certificate

Sample Fumes Investigation Report (CP26) certificate created with CertBox, showing the professional PDF layout with reported symptoms and incident timeline, co readings at various locations in the property, appliance-by-appliance testing and analysis

Sample CP26 with fictional data. All personal details shown are fake.

What it covers

  • Reported symptoms and incident timeline
  • CO readings at various locations in the property
  • Appliance-by-appliance testing and analysis
  • Flue and ventilation assessment
  • Appliance classification (safe, At Risk, or Immediately Dangerous)
  • Actions taken and recommendations

Who needs a CP26?

Gas engineers responding to CO/fumes incidents
Landlords
Emergency services

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Frequently asked questions about CP26

When should a CP26 be completed?
A CP26 should be completed whenever an engineer investigates a report of fumes, carbon monoxide alarm activation, or suspected CO poisoning. It provides a formal record of what was found and what action was taken, which may be needed by the HSE, landlord, or insurance company.
What CO readings trigger further action?
Any CO reading above 0 ppm in ambient air is a concern. Readings above 10 ppm in ambient room air require immediate investigation. The engineer should use a calibrated CO analyser and record readings at multiple locations including near appliances, at breathing height, and in adjacent rooms.

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