Commercial Gas Safety Certificates: What the Law Requires

If your business uses gas — for heating, hot water, catering or a production process — you have legal duties to keep those appliances and pipework safe. A commercial gas safety certificate is the documented proof that a Gas Safe registered engineer has inspected your gas installation and found it safe to use. This guide explains what the law actually requires, how often you need an inspection, and what the different commercial certificates cover.

The legal duty behind commercial gas safety

Gas safety in the UK is governed by the Gas Safety (Installation and Use) Regulations 1998, alongside the general duties in the Health and Safety at Work etc. Act 1974. Together they require anyone responsible for commercial premises to ensure that gas appliances, fittings and flues are maintained in a safe condition. For domestic landlords the law is very specific: an annual gas safety check on appliances and flues is a legal requirement, recorded on a Landlord Gas Safety Record (often called a CP12).

Do commercial premises need an annual certificate?

Commercial premises are treated on a risk basis rather than by a single fixed statutory interval, but the practical answer is that annual inspection is the accepted standard. Duty holders must be able to show their gas installation is safe and maintained, and an annual commercial gas safety inspection — valid for 12 months — is how most businesses demonstrate this. It is also routinely required by insurers, and the inspection can usually be scheduled from around the tenth month so you never fall out of cover.

The commercial gas certificates explained

"Commercial gas safety certificate" is an umbrella term. Depending on your appliances, an engineer may issue:

• CP15 — a commercial boiler gas safety certificate.

• CP16 — commercial gas installation testing and purging.

• CP17 — a non-domestic gas installation safety report, covering the pipework and installation.

• CP42 — the commercial catering gas safety certificate, essential for restaurants, pubs, kitchens and other food businesses.

The right certificate depends on your setup; a competent engineer will identify which apply to your premises.

Why it must be a Gas Safe registered engineer

By law, gas work must be carried out by an engineer on the Gas Safe Register — the official register that replaced CORGI in 2009. Engineers must also hold the correct commercial qualifications, which are separate from domestic ones. A certificate issued by anyone who is not suitably Gas Safe registered is not valid, so always check the engineer's registration and that their card covers commercial work.

Domestic vs commercial: what's the difference?

For domestic rented property, the annual landlord gas safety check is a strict legal requirement with a defined 12-month cycle. For commercial premises, the emphasis is on a risk-based duty to keep the installation safe — but in practice that means annual inspection by a commercially qualified Gas Safe engineer, appropriate to the appliances on site.

Commercial gas engineers in Manchester

Kilmal's commercial gas engineers are Gas Safe registered and commercially qualified, providing gas safety certificates, servicing, installation and repairs for businesses across Manchester and the North West. Many clients pair their gas checks with EICR testing to keep all their compliance on one schedule.

Frequently asked questions

Is a commercial gas safety certificate a legal requirement?

Businesses have a legal duty under the Gas Safety (Installation and Use) Regulations 1998 and health and safety law to keep gas appliances and pipework safe. An annual commercial gas safety inspection by a Gas Safe registered engineer is the standard way to meet and evidence that duty.

How often do I need a commercial gas safety inspection?

Annually. A commercial gas safety certificate is valid for 12 months, and inspections can usually be booked from around the tenth month to keep you continuously covered.

What is a CP42 certificate?

A CP42 is the commercial catering gas safety certificate. It is essential for restaurants, pubs, cafes and other food businesses that use commercial catering gas equipment.

Who can issue a commercial gas safety certificate?

Only an engineer on the Gas Safe Register who holds the relevant commercial qualifications. Domestic gas qualifications alone are not sufficient for commercial work.

How long is a commercial gas safety certificate valid?

Twelve months from the date of inspection, after which a renewal inspection is required.

Due a gas check? Kilmal's Gas Safe engineers issue commercial gas safety certificates.