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Carbon Monoxide Alarm Certificate

A Carbon Monoxide Alarm Certificate confirms that CO alarms have been installed and tested in a property. Since October 2022, CO alarms are mandatory in all rooms with a fixed combustion appliance (excluding gas cookers) in rental properties in England.

Smoke and Carbon Monoxide Alarm (England) Regulations 2015 (as amended 2022)Valid: Every 5-7 years (alarm lifespan)

What it covers

  • CO alarm locations and proximity to combustion appliances
  • Alarm make, model, and expiry date
  • Test results for each alarm
  • Compliance with EN 50291 standard

Who needs a CO Alarm Certificate?

Landlords (mandatory)
Homeowners (recommended)
Gas engineers

Create your CO Alarm Certificate with CertBox

1

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2

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3

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Frequently asked questions about CO Alarm Certificate

Where must CO alarms be installed?
In every room containing a fixed combustion appliance (gas boiler, gas fire, wood burner, oil boiler, etc.) — excluding gas cookers. The alarm must be ceiling-mounted or at head height on a wall.
Is a CO alarm the same as a smoke alarm?
No. A smoke alarm detects smoke particles from fires. A CO alarm detects carbon monoxide gas, which is invisible and odourless. You need both in a rental property — they serve completely different purposes.

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