CertBox
Gas Installers Create in CertBox

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.

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

No credit card required. Set up in 30 seconds.

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)
  • Tightness test at ~21 mbar (I.S. 813) 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

Create your RGII CERT 1 with CertBox

1

Fill in the form

Pick RGII CERT 1 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 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 (boiler replacement) and a CERT 3 (all other gas works — appliance fits, repairs, safety checks and servicing).
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. 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 RGII-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.

Learn more

Browse all certificate types

Related certificates

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

RGII CERT 3

Create RGII CERT 3 certificates for specific gas work in Ireland — disconnections, reconnections, purging, and emergency repairs.

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 1?

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

No credit cardCancel anytimeSet up in 30 seconds

Create your RGII CERT 1 in minutes