Quick Answer
Gas Safety Week is a reminder that poorly maintained appliances can be deadly. Here's everything London homeowners and landlords need to know about gas safety certificates and compliance.
Why Gas Safety Matters
Gas Safety Week — now in its twelfth consecutive year — is an annual reminder that gas appliances, when poorly installed or inadequately maintained, can be genuinely dangerous. Gas leaks, fires, explosions, and carbon monoxide poisoning are all potential consequences of faulty gas appliances — and none of them announce themselves in advance.
At RARE Plumbing London, all of our engineers are Gas Safe registered. We carry out annual gas safety inspections and issue certificates for properties across Central and North London. Here's what every London homeowner and landlord needs to know.
What Is the Gas Safe Register?
The Gas Safe Register is the UK's only official gas qualification regulatory body. It replaced the old CORGI scheme and is the statutory register under which all gas businesses and engineers must be listed to legally work on gas appliances in the UK. By law, any business offering gas services must be registered. Engineers carry official ID cards issued by the Register — always ask to see one before allowing any work on your gas appliances.
The Register maintains standards by regularly checking businesses and engineers. It is also the first place to look if you want to verify that the engineer you're considering using is genuinely qualified and registered.
What Is a Gas Safety Certificate (CP12)?
A Gas Safety Certificate — formally called a CP12, or Gas Safety Record — is a document issued by a Gas Safe registered engineer following a thorough safety inspection of all gas appliances and installations in a property. It records the engineer's findings, confirms that the appliances have been inspected and found safe (or notes any remedial action required), and provides a legal record of compliance.
A CP12 covers all gas appliances in the property — boiler, gas fires, gas cooker, gas water heater — as well as the gas pipework, meters, and flues. The inspection includes checking for gas leaks, verifying correct ventilation, testing safety controls, and carrying out combustion analysis on boilers.
Is a Gas Safety Certificate a Legal Requirement?
For landlords of rental properties: yes, absolutely. Landlords are legally required to have an annual gas safety check carried out by a Gas Safe registered engineer, and to provide their tenants with a copy of the resulting Gas Safety Record. Failure to comply can result in fines of up to £6,000 per appliance and up to six months imprisonment. It also invalidates landlord insurance.
For owner-occupiers: there is no legal requirement to hold a CP12. However, it is strongly advisable for any property with gas appliances, and essential if you are planning to sell the property — buyers' solicitors routinely request evidence of gas safety compliance. An annual gas safety inspection by a registered engineer is also the best way to catch appliance faults before they become dangerous.
What Happens During a Gas Safety Inspection?
A gas safety inspection typically takes two to three hours for a property with multiple gas appliances. Our engineers inspect every gas appliance in the property, check gas pipework for leaks and correct installation, verify that flues and ventilation are adequate and unobstructed, test safety devices and emergency controls, carry out combustion analysis on the boiler, and check the operation of the heat exchanger and safety shut-offs.
Where faults are found, we explain exactly what the issue is, what the risk level is, and what remedial work is required. In some cases, an appliance may need to be immediately isolated — our engineers will explain this clearly and discuss next steps before leaving the property.
Keeping Your Property Gas Safe Year-Round
A gas safety certificate is an annual snapshot — it confirms that appliances were safe at the time of inspection. Maintaining gas safety year-round requires a combination of annual inspections, prompt attention to warning signs (unusual smells, fault codes, unusual boiler behaviour), working carbon monoxide alarms on every floor where there is a combustion appliance, and professional servicing of all gas appliances annually.
If you ever smell gas in your property: do not operate electrical switches, open windows and doors, turn off the gas supply at the meter if safe to do so, evacuate the property, and call the National Gas Emergency Service on 0800 111 999.
Talk to a specialist today.
Our Gas Safe engineers are available same-day across Central and North London. No call-out charge quoted upfront. No obligation.