Commercial Gas Safety Compliance: A Plain-English Guide for 2026

We've written this for building managers, facilities teams and business owners who look after gas boilers, kitchens, heaters or pipework in commercial premises across the UK. It sticks to what the law and the official guidance actually say.

The Law: Gas Safety (Installation and Use) Regulations 1998

The main law for gas safety in Great Britain is the Gas Safety (Installation and Use) Regulations 1998, often shortened to GSIUR. It has been amended over the years, but the core duties for businesses are the same in 2026:

Employers and the self-employed must make sure gas appliances, flues, pipework and safety devices at their workplace are maintained in a safe condition (regulation 35). HSE guidance says maintenance should follow the manufacturer's instructions and appropriate standards, and treats an annual check by a Gas Safe registered engineer as a sensible minimum.

Landlords must have gas appliances and flues they provide in rented homes checked for safety every year, and keep a record of each check (regulation 36). This includes HMOs and student accommodation.

Anyone doing gas work must be competent, and for most work that means being on the Gas Safe Register.

Use a Gas Safe Registered Engineer

Gas Safe Register is the official list of businesses and engineers allowed to do gas work in the UK. It replaced CORGI in 2009. Plumbers or general contractors who are not registered must not work on gas, however small the job.

Registration is not one-size-fits-all. Each engineer's Gas Safe ID card lists the types of work they are qualified for. An engineer qualified only for domestic boilers is not qualified to work on commercial catering equipment or large commercial boilers.

How to check: ask to see the engineer's Gas Safe ID card before work starts, check the back of the card for the right qualifications, and confirm their details on the Gas Safe Register website or by calling 0800 408 5500. Note the engineer's licence number in your maintenance file.

Which Certificate Do You Need?

"Gas safety certificate" is used loosely. In practice, the record you get depends on the type of building and equipment:

Commercial kitchens: CP42. The CP42 is the industry form for a gas safety inspection of a commercial catering installation, such as a restaurant, café, hotel, school or care home kitchen. Part 1 covers the kitchen as a whole: gas isolation, interlocks, ventilation and extraction. Part 2 covers each gas appliance. Annual inspection is the norm.

Rented homes, HMOs and student blocks: landlord gas safety record (often called CP12). This is a legal requirement every year, and landlords must keep the records.

Boilers and plant in offices, schools, warehouses and other commercial buildings. Your engineer will use a non-domestic gas safety or service record for boiler rooms and heating plant, and should give you a written record of what was checked and any faults found.

Commercial Kitchens: Interlocks and Ventilation

Kitchens are where we see the most problems. Gas cooking needs plenty of fresh air and working extraction. Where a kitchen has mechanical ventilation, the gas supply to the appliances should be interlocked with the fans, so gas shuts off automatically if the extraction stops. Without this, carbon monoxide can build up quickly.

HSE's guidance for catering businesses (Catering Information Sheet 23) recommends annual inspection by a Gas Safe registered engineer as a reasonable minimum. It also tells kitchen staff never to block air vents or use appliances with the extraction turned off.

What a Gas Safety Check Looks At

Every inspection is different, but a Gas Safe engineer will typically check:

Gas tightness of the pipework; gas pressure and burner operation against the manufacturer's figures; flues and chimneys for blockages and correct operation; combustion (flue gas) readings; ventilation; and safety devices such as flame failure devices, interlocks and emergency isolation valves. Anything unsafe will be classed and labelled, and dangerous appliances will be turned off until repaired.

If You Smell Gas or a CO Alarm Goes Off

Call the National Gas Emergency Service on 0800 111 999 straight away (or your LPG supplier for LPG). Turn off the gas at the emergency control valve if it is safe to do so, open doors and windows, and do not use electrical switches, naked flames or anything that could spark. Get people out of the area. If anyone feels unwell, get medical help.

Do not turn the gas back on until a Gas Safe registered engineer has found the cause and made it safe.

Keeping Good Records

Good records show you have met your duties and make audits and insurance questions much easier. For each site, keep:

Every gas safety record and service report; the engineer's name and Gas Safe number; a list of gas appliances and where they are; any warning notices issued and how they were fixed; and the date the next check is due. A single shared digital folder per site works well.

What Happens If You Don't Comply

Gas safety in workplaces is enforced by the HSE or the local council, depending on the type of premises. Inspectors can issue improvement notices or prohibition notices, which can stop equipment being used straight away, and can prosecute. Courts can impose unlimited fines for serious health and safety offences, and individual managers and directors can be prosecuted too. Insurers will also usually expect to see that gas equipment has been properly maintained.

Also New in 2026: Heat Network Regulation

If your building has a shared heating system serving several flats or units, there is a genuinely new set of rules. Ofgem became the heat network regulator on 27 January 2026, and existing heat networks need to be registered by 26 January 2027. See our heat network compliance page for what this means.

How Adapt Gas Can Help

Adapt Gas is a commercial gas engineering company based in Manchester. Our Gas Safe registered engineers carry out gas safety inspections, commercial kitchen CP42 checks and planned maintenance, and we give you clear written records after every visit. See our compliance services or planned maintenance to find out more, or call 0161 526 5588.