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RGII Certificate of Compliance (CERT 1)

An RGII CERT 1 is the standard Irish certificate of compliance for new gas installations and alterations to existing pipework, issued under IS 813 (Domestic Gas Installations). It must be completed by an RGII-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.

IS 813:2002+A1:2010 (Domestic Gas Installations), S.I. 299 of 2007 (Building Regulations, Part J)Valid: No fixed expiry — attached to the installation

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Sample RGII CERT 1 certificate

Sample RGII Certificate of Compliance (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 RGII 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)
  • IS 813 tightness test at 20 mbar with result
  • Ventilation and CO alarm checks
  • RGII registration number and installer signature

Who needs a RGII CERT 1?

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

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Frequently asked questions about RGII CERT 1

What is an RGII CERT 1 used for?
A CERT 1 is issued for new gas installations and alterations to existing gas pipework or appliances in Ireland. It confirms the work complies with IS 813 and is safe for use. It is distinct from a CERT 2 (servicing) and a CERT 3 (specific gas work like disconnection or purging).
Who can issue a CERT 1 in Ireland?
Only an RGII (Registered Gas Installers of Ireland) registered installer can issue a CERT 1. The installer's RGII registration number must appear on the certificate. You can verify a contractor's registration at rgii.ie.
Is an RGII certificate required for a new boiler in Ireland?
Yes. Any new boiler installation or gas appliance connection in Ireland requires an RGII CERT 1 to be issued and given to the customer. Without this certificate, the installation is not formally certified as compliant with IS 813.

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