In the UK, any work on gas appliances must be carried out by a Gas Safe registered engineer. It is not simply a recommendation; it is a legal requirement. Yet finding someone you can trust with your boiler, cooker, or fire takes a little effort. This guide will help you check registration, insurance, and references so you can welcome a qualified professional into your home with confidence.

Why a Qualified Gas Engineer Is Your First Line of Defence

Gas work done badly can lead to carbon monoxide poisoning, leaks, fires, and explosions. The risks are real, and they are not worth taking. Only an engineer on the Gas Safe Register is legally allowed to work on gas appliances in the UK. Anyone else—no matter how confident they sound—is breaking the law. Using an unregistered person also puts your home insurance at risk. If something goes wrong, your policy may be invalidated. A qualified engineer protects your property, your family, and your legal standing.

How to Check a Gas Safe Registration Properly

Every registered engineer carries a Gas Safe ID card. Ask to see it before any work begins. Do not accept a photocopy or a picture on a phone. Check the photo matches the person in front of you. Look at the licence number, the expiry date, and the security hologram. Turn the card over: the back lists the specific types of work the engineer is qualified to do. Make sure your job is covered—for example, boiler installation, cooker repair, or fire servicing. If you have any doubt, verify the licence number on the Gas Safe Register website or by phone. It is free, quick, and could save you from a serious mistake.

Insurance, Qualifications, and the Paperwork That Protects You

Even registered engineers should have public liability insurance. If they damage your property or cause injury, you need to know they can cover the cost. Ask to see their insurance certificate. If they employ other people, they also need employers' liability insurance. Qualifications go beyond the basic registration. For instance, working on boilers requires specific certificates such as CENWAT. Ask what relevant qualifications they hold for your type of appliance. A good engineer will be happy to show you. Never feel awkward about asking—it is your home and your safety.

References and Reviews: Learning from Other People's Experiences

Ask for two or three recent references from similar jobs. Then actually call those people. Ask if the work was done well, if the engineer was tidy and punctual, and if there were any unexpected costs. Online reviews can help, but be cautious: fake reviews exist. Look for detailed, balanced feedback rather than a string of five-star one-liners. Personal recommendations from friends or neighbours are often the most reliable. If an engineer refuses to provide references, that is a warning sign.

Red Flags: When to Walk Away

• Reluctance to show their Gas Safe ID card or insurance certificate.
• A quote that is suspiciously low compared to others.
• Demands for cash payment upfront, especially large sums.
• No fixed business address or landline number.
• Door-to-door cold calling offering cheap gas work.
• Pressure to make a decision immediately.
• No written quote or contract.

Any one of these should make you pause. Two or more, and you should look elsewhere. Trust your instincts—if something feels off, it probably is.

After the Work: What You Should Receive

Once the job is done, you should get documentation. For landlords, a Gas Safety Record is a legal requirement. For homeowners, ask for a benchmark certificate or commissioning checklist for new boilers. If the work involves a new boiler or a flue, the engineer must notify Gas Safe Register, and you will receive a Building Regulations compliance certificate. Keep all paperwork safe. It proves the work was done legally and to standard, which matters if you sell your home or need to make a claim.

Taking a few minutes to check registration, insurance, and references is a small price to pay for peace of mind. A qualified gas engineer will welcome your questions—it shows you value safety. With the right checks, you can keep your home warm and your family safe.