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RGI Declaration of Conformance (CERT 3)

An RGI CERT 3 is the Irish Declaration of Conformance for gas works on an existing installation that already has a meter: everything that is not a new-meter installation (CERT 1) or a boiler replacement (CERT 2). It covers new appliance fits (except boilers), pipework work, repairs, safety checks (I.S. 813 Annex E), servicing (Annex C), disconnection and reconnection, purging, and emergency work. It confirms the installation was left in a safe condition following the work. CertBox produces the supporting test record; the Declaration of Conformance itself must be issued on the numbered form supplied by the RGI scheme.

I.S. 813:2025 (Domestic gas installations, Edition 4); Energy (Miscellaneous Provisions) Act 2006Valid: No fixed expiry — attached to the specific work event

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Sample RGI CERT 3 certificate

Sample RGI Declaration of Conformance (CERT 3) certificate created with CertBox, showing the professional PDF layout with property and customer details, gas type and category of work (disconnection, reconnection, purging, emergency repair), full description of work carried out

Sample RGI CERT 3 with fictional data. All personal details shown are fake.

What it covers

  • Property and customer details
  • Gas type and category of work (disconnection, reconnection, purging, emergency repair)
  • Full description of work carried out
  • Tightness test result (or N/A if not applicable)
  • Confirmation that the installation was left in a safe condition
  • RGI registration number and installer signature

Who needs a RGI CERT 3?

RGI-registered gas installers
Tradespeople disconnecting appliances for kitchen/extension works
Emergency callout engineers
Any RGI installer carrying out purging or reconnection

Create your RGI CERT 3 with CertBox

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Frequently asked questions about RGI CERT 3

When do I need a CERT 3 rather than a CERT 1?
Use a CERT 3 for one-off or specific gas works: for example, when disconnecting an appliance before a kitchen refit, reconnecting after building work, purging the system, or attending an emergency repair. A CERT 1 is used for new installations or alterations to permanent pipework.
Is a tightness test required for a CERT 3?
It depends on the work. If pipework has been disturbed or reconnected, a tightness test is required. For work such as a standalone appliance disconnection where pipework was not disturbed and was capped, the test section may be marked N/A with a suitable note.
Can a CERT 3 be used for emergency gas work?
Yes. Emergency repairs that do not constitute a full new installation should be documented on a CERT 3. The certificate confirms the installation was made safe before the engineer left site.

Learn more

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