Gas Safety & Certification

Gas Leak Investigation

If you suspect a gas leak, you need clear answers quickly. A gas leak investigation checks your gas pipework and appliances, confirms whether a leak is present, and pinpoints the source so the right repairs can be planned and your property made safe.

More information

What a gas leak investigation covers

A Gas Safe registered engineer will carry out regulated safety checks to identify the problem and reduce risk. The service typically includes:

  • Leak testing to confirm whether gas is escaping from pipework or an appliance
  • Tracing and narrowing down the likely leak location
  • Visual inspection of accessible pipe runs, meter area and appliance connections
  • Safety checks of affected appliances where appropriate
  • Clear explanation of findings and recommended next steps
  • Written confirmation of results where required

When this service is most useful

Arrange an investigation if you:

  • Smell gas indoors or near the meter box
  • Have repeated loss of gas pressure or unexplained appliance issues
  • Have had building work, new appliances, or alterations to pipework
  • Manage a rental or commercial property and need prompt, documented action
  • Need reassurance after a suspected incident or report from a tenant

What happens during the visit

The engineer will ask what you have noticed, then carry out a structured set of tests and checks. This usually involves isolating sections of the installation, checking tightness, and inspecting connections and accessible pipework to narrow down the source. You will be talked through what is safe to use, what must stay off, and what needs repair.

After the investigation

You will receive a clear summary of what was found and what to do next. If urgent action is needed, you will be advised on immediate safety steps and repair options. If no leak is detected, you will still get practical guidance on monitoring and any further checks that may be sensible.

Frequently Asked Questions

What should I do if I smell gas?
Turn off the gas at the emergency control valve if it is safe to do so, open windows and avoid using switches or naked flames. Call the National Gas Emergency number on 0800 111 999, then arrange an investigation once it is safe.
Is gas leak investigation regulated work?
Yes. Testing, investigating and working on gas pipework and appliances must be carried out by a Gas Safe registered engineer. This protects safety and helps ensure any follow-up work is compliant.
Will you repair the leak during the same visit?
If the issue is straightforward and parts are available, repairs may be possible straight away. If not, you will be given a clear repair plan and options to make the installation safe in the meantime.
Do I need to turn off my gas supply before the engineer arrives?
If you suspect an active leak, it is often safest to turn off the supply at the emergency control valve, but only if you can do so safely. If you have any doubt, call 0800 111 999 for immediate advice and follow their instructions.
How long does a gas leak investigation take?
It depends on the size of the property, the number of appliances and how accessible the pipework is. You will be advised of the likely scope once symptoms and layout are understood, and kept updated as testing progresses.

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