A gas safety check is a formal inspection of all gas appliances, pipework, and flues in a property, carried out by a Gas Safe registered engineer. The time it takes depends primarily on how many gas appliances need to be checked and whether any issues are identified that require further investigation or discussion.

What Is Inspected During a Gas Safety Check

The engineer carries out a systematic inspection of every gas appliance in the property. For a typical residential property with a boiler, a gas hob, and possibly a gas fire, this involves checking each appliance for safe operation, testing the combustion quality, inspecting the flue or ventilation arrangements, checking for gas leaks at connections, verifying that all gas appliances shut off correctly, and checking the emergency controls and pipework. Each appliance receives a check on its physical condition, operation, and safety.

The engineer completes a Gas Safety Record listing each appliance, its location, whether it was accessible for inspection, whether it was found to be safe or unsafe, and any immediate defects or advisory notes. The completed Gas Safety Record is then provided to the property owner and, for rental properties, to the tenant within 28 days or before the tenancy begins.

Typical Duration

For a property with a combination boiler and a gas hob, the two most common appliances in a typical UK home, the check typically takes 30 to 45 minutes. If there are additional gas appliances such as a gas fire, a separate gas hob and oven, or a back boiler, each adds around 10 to 20 minutes. A property with five or more gas appliances might take one to one and a half hours for the full inspection.

If the engineer identifies an appliance that is unsafe or requires more detailed investigation, the check takes longer while the issue is assessed and the appropriate action, whether repairs or capping off the appliance, is carried out and documented. Properties where the boiler has not been serviced recently and is in poor condition may require more time if the engineer finds faults that need to be addressed on the day.

Combined Service and Safety Check

Many landlords and homeowners book a gas safety check in conjunction with the annual boiler service, which makes efficient use of the engineer's visit. The service includes more detailed work on the boiler internals and calibration, which takes additional time on top of the safety check itself. A combined service and safety check for a single boiler property typically takes one to one and a half hours.

Summary

A standard gas safety check takes 30 to 60 minutes for a property with one or two gas appliances. Additional appliances add around 10 to 20 minutes each. Defects or unsafe appliances requiring action on the day extend the time further. Combining the safety check with an annual service is a practical approach that makes efficient use of the engineer's visit and typically takes one to one and a half hours in total.