CertBox
Gas Installers Create in CertBox

RGII Certificate of Compliance (CERT 3)

An RGII 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.

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

No credit card required. Set up in 30 seconds.

Sample RGII CERT 3 certificate

Sample RGII Certificate of Compliance (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 RGII 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
  • RGII registration number and installer signature

Who needs a RGII CERT 3?

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

Create your RGII CERT 3 with CertBox

1

Fill in the form

Pick RGII CERT 3 from the list, fill in the fields on your phone.

2

Compliance checks run

Built-in validation catches missing fields and out-of-range readings.

3

PDF generated instantly

Professional PDF ready to share via secure link or download.

Frequently asked questions about RGII 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

Browse all certificate types

Related certificates

Gas Installers

RGII CERT 1

Create RGII CERT 1 gas installation certificates online. IS 813 compliant, tightness test records, instant PDF for Irish gas installers.

Gas Installers

RGII CERT 2

Create RGII CERT 2 boiler replacement certificates for Ireland. Records commissioning, flue gas analysis, tightness test and safe-to-use status. IS 813 compliant PDF.

Gas Installers

Landlord Gas Safety Record

Create landlord gas safety records for Irish rental properties on your phone. RGII compliant, annual inspection checklist, instant PDF.

Ready to create your RGII CERT 3?

Free plan available. Set up in 30 seconds, no card required.

No credit cardCancel anytimeSet up in 30 seconds

Create your RGII CERT 3 in minutes