How to check a Gas Safe engineer is qualified for commercial work

Commercial engineers covering Suffolk, Essex and Cambridgeshire

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To check a Gas Safe engineer is qualified for commercial work, do three things before the job starts: confirm the business and the engineer are on the Gas Safe Register (on the Register's website or by phoning 0800 408 5500), look at the engineer's Gas Safe ID card to see that it is in date and that it lists the right commercial (non-domestic) work categories for the appliance and the type of work, and keep a note of what you checked. For workplaces covered by the Gas Safety (Installation and Use) Regulations 1998, HSE is clear that checking registration and qualifications is the employer's responsibility, not the contractor's. This guide explains where to look, what the commercial categories mean and what to ask.

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Commercial heating tips and advice · 16 October 2026 · Fast Commercial Boiler Help, Gas Safe 985448

How to check Gas Safe commercial qualifications

Why the duty holder has to check

Regulation 3(1) of the Gas Safety (Installation and Use) Regulations 1998 (GSIUR) says "No person shall carry out any work in relation to a gas fitting or gas storage vessel unless he is competent to do so." Regulation 3(2) extends that duty to the people who commission the work: every employer and self-employed person "who has required such work to be carried out at any place of work under his control shall ensure that paragraph (1) above is complied with". Regulation 3(3) adds that a business may only do such work if it is a member of a class of persons approved by HSE, which in practice is the Gas Safe Register. HSE's page on the scheme says that for a gas engineering business to legally undertake gas work within the scope of the Regulations, it must be on the Gas Safe Register.

HSE's guidance for employers puts it plainly. In workplaces such as shops, restaurants, schools and hospitals, work on gas fittings "must be carried out by a Gas Safe registered engineer who is qualified to do the work. It's illegal for anyone else to do it. It's your responsibility to check a person is registered and is qualified."

HSE's wider leaflet on using contractors, INDG368, makes the same point for any contracted work: "Both you and the contractor you use have responsibilities under health and safety law." It says you should make enquiries about the contractor's competence ("do they have the right combination of skills, experience and knowledge?"), that the level of enquiries should match the level of risk and the complexity of the job, and it ends one example with: "Don't assume someone is competent, check it yourself."

Step 1: check the business and the engineer on the Gas Safe Register

HSE says you can check whether a person is registered with Gas Safe, and what gas qualifications they hold, by using the Gas Safe Register website or by phoning Gas Safe Register on 0800 408 5500. On the Register's website you can check an engineer's or a business's registered status by searching the business name, registration number, business phone number, engineer name or ID number. HSE's Check an Engineer page adds that, by entering the licence number from the engineer's ID card, you can see pictures of registered engineers and details of their qualifications.

Check two things, not one: that the business you are contracting with is registered (it has a business registration number), and that each engineer who will attend is registered with that business and holds the right qualifications. Gas Safe Register's own guidance says you can confirm an engineer is from the company you contacted by checking the business name and Gas Safe registration number on their card.

Step 2: read the Gas Safe ID card, front and back

Gas Safe Register says every registered engineer is issued with a Gas Safe ID card (also called a licence card), which can be a physical card or a digital card on the engineer's phone or device. Its guidance lists what to look for:

On the card	What to check
Photo	The person on site matches the engineer on the card.
Business name and registration number	The engineer works for the business you contracted, or for a subcontractor you have agreed and checked.
Start and expiry dates	The card is in date. Gas Safe Register says engineers have to renew their licence every year and their qualifications every five years.
Licence number	A unique seven-digit number. It changes each time a new card is issued, so check the number on today's card.
Qualifications (work categories)	The categories cover the appliance and the work. They are on the back of a physical card, or further down a digital card.
Hologram or QR code	A genuine physical card shows the Gas Safe logo hologram; a digital card shows a QR code you can scan to verify the engineer's details on the official Register site.

HSE describes the same layout: the front of the card has a photograph, a registration number and an expiry date, and the reverse shows the different categories of work the engineer is qualified to undertake. Gas Safe Register's advice is that if an engineer cannot show a valid ID card, you should not let them carry out the work and should contact the Register.

Step 3: match the commercial categories to your plant

This is the step most often missed on commercial sites. Gas Safe Register explains that every engineer needs certain "core" qualifications to be registered, and that additional qualifications then show on the card as separate work categories. Its definition of commercial work is worth reading closely: "Commercial work categories refer to the size of pipework, appliance type and gas consumption in addition to property type." It also notes that property type is not the only test: a "domestic" gas boiler installed in a church may still be treated as a domestic appliance, even though the building is non-domestic. So the question is not just "are they Gas Safe?" but "are they qualified for this appliance, on this gas, for this type of work?"

Gas Safe Register's guide to the commercial ID card work categories includes these, among others (wording summarised from its definitions):

Commercial category on the card	What Gas Safe Register says it covers	Typical commercial plant
Wet Central Heating	Gas fired commercial boilers for heating and hot water	Plant room boilers in offices, schools, care homes
Air Heating	Gas fired commercial flued air convector heaters	Warm air heaters in warehouses and workshops
Radiant Tube or Plaque heaters	Gas fired commercial flued or flueless radiant heaters, single or in groups	Overhead radiant heating in factories and warehouses
Direct fired Air Heater	Gas fired flueless convector heaters, single or in groups	Direct fired heaters in large open buildings
Indirect gas fired heating appliances	Gas fired forced convection air heaters and gas fired hot water boilers, single or in groups	Indirect fired air heaters and hot water boilers
Commercial Pipework	Installing and removing gas pipework greater than 35mm (1 1/4") in diameter	Plant room and site distribution pipework
Commercial Pipe work commissioning	Testing and purging of commercial pipework	New or altered commercial installations
Commercial Catering	Gas fired commercial catering appliances, flued or flueless (Gas Safe Register notes that various elements make up the full competency)	Restaurant and school kitchens
Commercial Laundry	Gas fired commercial flued or flueless laundry equipment	Care home and hotel laundries
Meters	Installing and exchanging gas meters supplying more than 6m3/h	Larger commercial gas supplies
Vessels	Connection, testing and commissioning of LPG pipework from single or multiple storage vessels to the building isolation valve	Bulk LPG sites

The Register also distinguishes the type of work: install, commission, service and safety check are separate activities, and it points out that "Not every registered business/engineer will offer all of these services". Its glossary also separates natural gas (from the mains) from LPG (cylinders or a bulk tank), so check the card covers the gas you use. If you are unsure whether an engineer is qualified for a particular appliance, Gas Safe Register invites you to email [email protected].

For example, a contractor who is perfectly qualified to service your commercial boilers may not hold the catering category your kitchen needs (see our guide to commercial kitchen gas interlocks), or the pipework categories needed to extend the gas supply to a new warm air heater.

Factories and other premises outside GSIUR

HSE lists some workplaces where gas work must instead be carried out by a competent person under the general duties of the Health and Safety at Work etc Act 1974. Its list includes factories, mines, quarries, agricultural premises and construction site huts. HSE says it is still "your responsibility to check they're competent to do the work", and that a competent person should have the necessary training, skills, experience and knowledge to do the work safely. Any part of those premises used as domestic, residential or sleeping accommodation needs a Gas Safe registered engineer.

HSE's catering information sheet CAIS23 makes the practical point for premises outside GSIUR, such as canteens in factories: "In practical terms, Gas Safe registration is the clearest way of demonstrating competence." The same sheet says employers using contractors for gas work should take reasonable steps to check that contractors have a current relevant certificate of competence, by asking to see the individual's Gas Safe identity card and verifying it with Gas Safe Register, and warns: "People can sometimes use out-of-date certificates."

A simple competence check for commercial gas contractors

INDG368 suggests questions to ask potential contractors, including how the work will be managed and supervised, and whether they will use subcontractors and how they check those subcontractors are competent. Its checklist asks: "Have you made enquiries about the competence of the contractor? If so, have you checked for evidence before they get the job?" For commercial gas work, that turns into a short routine:

Before you appoint. Get the business's Gas Safe registration number and check it on the Register. Describe the plant (boilers, warm air or radiant heaters, catering, pipework, natural gas or LPG) and the work (install, commission, service, safety check), and ask which engineers hold the matching commercial categories.
Subcontractors. Ask whether any of the work will be subcontracted, and check the subcontractor's registration in the same way.
On the day. Ask to see each engineer's ID card. Check the photo, the business, the dates and the categories against the job.
Keep a record. Note the engineer's name, business, registration number and licence number against the visit. Our guide to heating maintenance records shows where that fits in your file, and the service report from each visit (see what a commercial boiler service includes) should name the engineer.
If something doesn't match. Don't let the work go ahead. Contact the contractor and, if needed, Gas Safe Register on 0800 408 5500.

HSE's employers page gives a reminder of why it matters: a plumber who was not Gas Safe registered, and had already been served with a prohibition notice by HSE, kept carrying out illegal gas work in a shop, was caught on CCTV, was prosecuted for 2 breaches of health and safety law and was sentenced to 2 concurrent terms of 6 months in prison.

Checking an engineer is always the duty holder's job; doing gas work is never the site team's job. If you suspect a gas leak, HSE says to turn off the supply and phone the National Gas Emergency Service on 0800 111 999 (for LPG, your LPG supplier), and not to turn the gas back on until the leak has been dealt with by a competent person.

Checking Fast Commercial Boiler Help

Fast Commercial Boiler Help's Gas Safe registration number is 985448, and you are welcome to check it on the Gas Safe Register before you book. Tell us what plant you have and what work you need, and ask any engineer who attends to show you their Gas Safe ID card so you can check their commercial categories against the job. Our commercial gas engineers carry out commercial gas safety inspections, boiler servicing and gas supply and safety work, including on LPG commercial heating. Gas Safe registration covers gas work only; where oil-fired plant is fitted, our engineers who work on oil are OFTEC trained.

Safety note

Under the Gas Safety (Installation and Use) Regulations 1998, gas work must be carried out by a Gas Safe registered engineer, and we apply that rule on every site. Don't attempt DIY work on gas appliances, burners, flues or safety devices. On pressure systems, trained site staff should stick to visual and gauge checks, log the readings and report anything abnormal. Never adjust, cap, plug or test-lift a relief valve yourself.

Talk to a Gas Safe commercial engineer

Fast Commercial Boiler Help is a Gas Safe registered (985448) commercial heating business based at 4 Market Hill, Clare, Sudbury, Suffolk CO10 8NN. Our team of over 10 local engineers covers East Anglia and East London, working on commercial boilers, plant rooms, water heaters, and warm air, radiant and unit heaters. We work on commercial premises only.

Call 0800 0996 007

Call or WhatsApp 07947 578332 (a photo of the appliance data plate or the fault display helps) · Email [email protected]

Frequently asked questions

How do I check a Gas Safe engineer is qualified for commercial work?

Check the business and the engineer on the Gas Safe Register website or by phoning Gas Safe Register on 0800 408 5500, then look at the engineer's Gas Safe ID card. Make sure the card is in date and that its work categories include the commercial (non-domestic) category for your appliance, gas type and the type of work, such as install, commission, service or safety check.

Where are commercial qualifications shown on a Gas Safe ID card?

Gas Safe Register says the work categories an engineer is qualified for are on the back of the physical card, or further down the screen on a digital ID card. HSE describes the front as showing a photograph, a registration number and an expiry date, and the reverse as showing the categories of work the engineer is qualified to undertake.

Is a domestic Gas Safe qualification enough for a commercial building?

Not necessarily. Gas Safe Register says commercial work categories refer to the size of pipework, appliance type and gas consumption in addition to property type. A commercial boiler, warm air heater, catering range or pipework above 35mm needs the matching commercial category, while a domestic-type boiler in a non-domestic building such as a church may still count as a domestic appliance. If unsure, Gas Safe Register invites you to email [email protected].

Whose responsibility is it to check a gas engineer's qualifications?

The duty holder's. HSE's guidance for employers says it is your responsibility to check a person is registered and is qualified, and GSIUR regulation 3(2) requires an employer or self-employed person who has required gas work to be carried out at a place of work under their control to ensure the person doing it is competent.

Do factories need a Gas Safe registered engineer?

HSE says that in some workplaces, including factories, mines, quarries, agricultural premises and construction site huts, gas work must be carried out by a competent person, and it is your responsibility to check their competence. Any part used as domestic, residential or sleeping accommodation needs a Gas Safe registered engineer. HSE's CAIS23 notes that in practical terms Gas Safe registration is the clearest way of demonstrating competence.

How often do Gas Safe qualifications need renewing?

Gas Safe Register says engineers have to renew their licence every year and their qualifications every five years, so always check the start and expiry dates on the ID card. The seven-digit licence number also changes each time a new card is issued.

Sources and further reading