Registrations, certificates, questions to ask and typical UK prices.
By law, anyone working on gas in your home must be on the Gas Safe Register. That covers boilers, gas fires, hobs and cookers. It's the single most important thing to check, and it's easy: every registered engineer carries a Gas Safe ID card showing which appliances they're qualified to work on, and you can check their licence number on the Gas Safe Register website or by calling 0800 408 5500.
Landlords must have every gas appliance checked every 12 months and give tenants a copy of the Gas Safety Record (often called a CP12). Homeowners aren't legally required to, but an annual boiler service catches problems early and is often a condition of the boiler's warranty.
Warning signs to act on: a yellow or orange flame instead of blue, soot or staining around an appliance, a pilot light that keeps going out, or a carbon monoxide alarm sounding.
| Boiler service | £70–£120 |
| Landlord gas safety check (CP12) | £60–£90 |
| Boiler repair call-out | £80–£150 + parts |
| New combi boiler, fitted | £2,000–£3,500 |
Guide ranges only. Prices vary with the job, access and time of day. Always get a quote before work starts.
Ask for their Gas Safe ID card and check the licence number on the Gas Safe Register website or by phone on 0800 408 5500. It's free and takes a minute.
Every 12 months for each gas appliance and flue, with a copy of the Gas Safety Record given to tenants.
Leave the property, don't use electrical switches or naked flames, and call the National Gas Emergency Service on 0800 111 999.