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RGI Declaration of Conformance (CERT 1)

A CERT 1 is the Declaration of Conformance issued where a gas installation needs a new meter fit (a new connection to the network) under I.S. 813 (Domestic Gas Installations). It must be completed by an RGI-registered gas installer and confirms that the work has been designed, installed, and tested in accordance with Irish gas safety regulations. Landlords, developers, and homeowners in Ireland require this certificate following any new gas installation or significant alteration. 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 2006; S.I. 299 of 2007 (Building Regulations, Part J)Valid: No fixed expiry — attached to the installation

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Sample RGI CERT 1 certificate

Sample RGI Declaration of Conformance (CERT 1) certificate created with CertBox, showing the professional PDF layout with property and customer details with eircode, gas type (natural gas or lpg) and type of work, description of pipework including material and sizes

Sample RGI CERT 1 with fictional data. All personal details shown are fake.

What it covers

  • Property and customer details with Eircode
  • Gas type (natural gas or LPG) and type of work
  • Description of pipework including material and sizes
  • Details of each gas appliance installed (type, make, model, flue type, kW rating)
  • Tightness test at ~21 mbar (I.S. 813) with result
  • Ventilation and CO alarm checks
  • RGI registration number and installer signature

Who needs a RGI CERT 1?

RGI-registered gas installers
Homeowners with new gas installations
Developers and builders
Landlords following new pipework

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Frequently asked questions about RGI CERT 1

What is an RGI CERT 1 used for?
A CERT 1 is issued for gas work that needs a new meter fit, that is a new connection to the gas network. It confirms the work complies with IS 813 and is safe for use. It is distinct from a CERT 2 (boiler replacement on a metered installation) and a CERT 3 (all other gas works on a metered installation, including pipework, appliance fits, repairs, safety checks and servicing).
Who can issue a CERT 1 in Ireland?
Only an RGI (Register of Gas Installers of Ireland) registered installer can issue a CERT 1. The installer's RGI registration number must appear on the certificate. You can verify a contractor's registration at rgii.ie.
Is an RGI certificate required for a new boiler in Ireland?
Yes. A gas boiler installed as part of a new installation requiring a new meter or network connection is certified on a CERT 1; a boiler replacement on an existing metered installation is certified on a CERT 2. Either way, the RGI-registered installer must issue the Declaration of Conformance to the customer. Without it, the work is not formally certified as compliant with I.S. 813.

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