In Northern Ireland, anyone doing gas work must be on the Gas Safe Register under the Gas Safety (Installation and Use) Regulations (Northern Ireland) 2004, while nidirect advises using an OFTEC registered technician for oil-fired boilers.

Gas work and the Gas Safe Register

The Health and Safety Executive for Northern Ireland (HSENI) says that from 1 April 2010 gas fitters are required to be registered with Gas Safe Register, after the CORGI scheme ended on 31 March 2010, and that it is a legal requirement for gas fitters to be competent and registered at all times. Gas Safe Register deals with the downstream gas industry under the Gas Safety (Installation and Use) Regulations (Northern Ireland) 2004, for both piped natural gas and liquefied petroleum gas.

nidirect describes Gas Safe Register as the official registration for all gas engineers in Northern Ireland and says all engineers must be on the register and hold current qualifications to install, repair or maintain domestic gas appliances. HSENI says the registration service is contracted on a single UK-wide agreement running from 1 April 2025 to 31 December 2029.

Checking an engineer

nidirect says every registered engineer carries an ID card and that it should be requested before any gas work starts. The front should show a photograph, start and expiry dates, a licence number, a security hologram and the business, which should be the one the householder contacted. The back lists the types of gas work the engineer is qualified to do, and those qualifications should be current. The register website can also confirm that an engineer is registered.

HSENI adds that new businesses and engineers, and returners with a history of complaints or unsafe work, go through a probationary period in which they must report their work so it can be inspected, and that Gas Safe Register inspectors monitor work and handle complaints.

Homeowners and landlords

nidirect says a homeowner is responsible for making sure gas fittings and appliances are safe and that all gas appliances and flues are regularly maintained, with a safety check at least annually, or at any time when safety is in doubt, by a Gas Safe registered installer.

A landlord must keep installation pipework, appliances and flues provided for tenants in a safe condition, arrange an annual safety check by a Gas Safe registered installer, keep a record of each check for two years and give a copy to existing tenants within 28 days and to new tenants before they move in. Tenants are expected to allow access and to keep any appliances they own maintained, with a safety check at least every 12 months by a Gas Safe registered installer. If there is any doubt about the safety of gas equipment, nidirect says it should be turned off and left untouched until it has been checked.

Oil-fired boilers

nidirect says anyone installing an oil-fired boiler, or needing one checked or repaired, should use an OFTEC registered technician, because OFTEC keeps the register of trained and assessed technicians qualified to work safely with oil-fired appliances in Northern Ireland. It notes that building control regulations cover boilers, stoves and the siting of an oil tank, and that a registered technician installs the boiler and tank to building control standards and provides a commissioning certificate meeting those regulations.

The technician should use a flue gas analyser to set up the boiler correctly and check for carbon monoxide leakage, and HSENI recommends annual servicing of boilers and tanks. As with gas, the technician’s ID card should show a photograph and the work they are qualified to do, and OFTEC can confirm registration.

Carbon monoxide

nidirect says gas that does not burn properly, like coal, wood or oil, produces carbon monoxide, which cannot be seen, tasted or smelled. Its symptoms include headaches, tiredness, nausea and difficulty thinking clearly. It advises anyone with such symptoms who suspects carbon monoxide to stop using all cooking and heating appliances, open windows, see a doctor at once and call a qualified engineer.

nidirect says about 30 people in the UK die each year from carbon monoxide poisoning caused by gas systems that are not properly installed or maintained, and that the best protection is regular servicing of gas and other fossil fuel appliances, flues and chimneys by a Gas Safe registered engineer. Following two deaths in Castlerock, HSENI encourages users of all fossil fuels to have appliances serviced regularly and to fit carbon monoxide alarms as a second line of defence.

FAQs

Is Gas Safe registration needed in Northern Ireland?

Yes. HSENI says gas fitters must be registered with Gas Safe Register, and the requirement has applied since 1 April 2010.

Who should service an oil boiler in Northern Ireland?

nidirect advises an OFTEC registered technician and says HSENI recommends servicing boilers and tanks annually.

Do the England, Scotland and Wales rules apply?

No. This guide covers Northern Ireland, which has its own regulations and building control.

Bottom line

In Northern Ireland, a gas boiler must be installed and serviced by a Gas Safe registered engineer under the 2004 regulations, and an oil boiler by an OFTEC registered technician working to building control standards. Homeowners are responsible for annual safety checks and landlords have added duties. This is general information, not advice on any specific installation; HSENI and the relevant register can confirm details.

Sources

This guide draws on the following primary sources, current as of 21 September 2026:

• Health and Safety Executive for Northern Ireland, “Gas”
• nidirect, “Gas Safe Register”
• nidirect, “Domestic gas installation and health and safety”
• nidirect, “Domestic oil installation and boiler servicing”

Related guides

Best Boiler Deals is an independent guide. We may earn a fee from some links; this never affects what we write. This article is general information, not regulated advice on any specific installation — always confirm the details with a Gas Safe registered engineer.