Gas Tightness Test

What a gas tightness test covers

A tightness test is a controlled pressure test of the gas installation to confirm there are no leaks and the pipework is sound. The service typically includes:

• A visual check of accessible gas pipework and connections
• Isolation of the installation and connection of calibrated test equipment
• A timed pressure test to identify any pressure drop
• Checks to help pinpoint likely leak locations if the test indicates an issue
• Clear results explained in plain English, with next steps if further work is needed

When this service is most useful

A gas tightness test is a sensible choice if:

• You can smell gas, or have concerns about a possible leak
• A property has been empty for a period and you want reassurance before use
• Gas pipework has been altered, extended, or disturbed during building work
• You are a landlord or managing agent and need documented safety checks
• An appliance keeps locking out and supply issues need ruling out

If you smell gas or suspect an active leak, treat it as urgent and follow the emergency advice from your gas supplier.

How the test is carried out

Your engineer will isolate the gas supply, connect a manometer, then carry out a timed test to measure whether the system holds pressure within permitted limits. You may be asked to provide access to the gas meter, any boiler cupboard, and areas where gas pipework runs.

Where the readings suggest leakage, further investigation may be required to locate the issue safely and recommend remedial work.

What happens after the test

You will be told the outcome straight away, along with any safety actions needed. If the installation passes, you have clear confirmation the pipework is sound at the time of testing.

If it fails, you will receive practical options to resolve it, which may include targeted leak tracing, repairs to joints or valves, or replacement of affected sections of pipework.