Gas safety records

Who can issue a CP12?

Only a Gas Safe registered engineer can carry out the gas safety check and issue a valid CP12, and only for the appliance types they're qualified for. Gas Safe Register is the official list of businesses and engineers legally allowed to work on gas in the UK, always check the ID card before work starts.

Gas Safe registration is the law

By law, anyone carrying out gas work in the UK must be on the Gas Safe Register. It replaced CORGI registration in 2009. Registration isn't a one-off badge: engineers hold specific competencies (for example domestic boilers, cookers, or commercial catering), and can only legally work on, and certify, the categories they're qualified for.

How to check an engineer before they start

Ask for the Gas Safe ID card

Every registered engineer carries one. It shows their photo, licence number, the business they work for and a start/expiry date.

Check the back

The reverse lists the specific gas appliance types they're qualified to work on. Make sure your appliance is covered.

Verify online or by phone

You can confirm a licence number on the Gas Safe Register website or by phone if anything looks off.

This is why no “free CP12 generator” can issue a valid record: the document's authority comes from a registered engineer signing off an in-person check, not from the form itself.

Frequently asked

Can I create my own CP12?

No. Only a Gas Safe registered engineer who has carried out the check can issue a valid Landlord Gas Safety Record. Software helps the engineer produce and store the record, but it can't replace the registration or the physical check.

Is Gas Safe the same as CORGI?

Gas Safe Register replaced CORGI as the official UK gas registration body in 2009. CORGI registration is no longer the legal standard; only Gas Safe registration counts today.

What if an engineer isn't registered for my appliance?

They shouldn't work on it. Registration is by appliance category, so an engineer qualified for domestic boilers may not be qualified for, say, commercial catering equipment. Check the back of the ID card matches the job.

Sources

Last reviewed July 2026. This guide is general information, not legal or safety advice, gas safety work must be carried out by an appropriately Gas Safe registered engineer. Rules can change, so check the linked official sources for the current position.

Spend less of your evening on this.

Manifold does CP12s on the doorstep and chases the renewals for you. It’s in early access for UK gas engineers, no card, just your first look.