Gas Leak Detection

How We Detect Gas Leaks

When you call AG Heating with a suspected gas leak, our Gas Safe registered engineer will attend promptly and carry out a thorough, systematic inspection of your gas supply, appliances, and pipework. We use professional-grade electronic gas detectors and pressure testing equipment to pinpoint even hard-to-find leaks — whether at the meter, within the pipework, or at an appliance connection.

Our gas leak detection process includes:

• Initial safety assessment and ventilation of the property
• Electronic gas leak detection using calibrated sensor equipment
• Pressure testing of pipework to identify loss of containment
• Inspection of all gas appliances, valves, and fittings
• Meter and meter connection check
• Leak repair or isolation of the affected section
• Gas tightness test to confirm the system is safe
• Gas Safe certificate issued on completion

Most gas leak investigations are completed in a single visit. Where additional repair work is required, our engineer will explain exactly what needs to be done, agree a fixed price, and carry out the work as quickly as possible — prioritising your safety at every stage.

Do You Suspect a Gas Leak?

You should treat any of the following as a potential gas leak and act immediately:

✅ A smell of gas — rotten eggs or sulphur — inside or outside your property

✅ A hissing or whistling sound near a gas pipe, meter, or appliance

✅ Dead or discoloured plants or grass near underground gas pipes

✅ Feeling dizzy, nauseous, or unwell indoors that improves when you go outside

✅ Unexpectedly high gas bills with no obvious change in usage

✅ A gas appliance flame burning orange or yellow instead of blue

If you notice any of these signs, do not attempt to investigate yourself. Open windows and doors, do not use electrical switches, and call the National Gas Emergency Service on 0800 111 999 immediately — then call AG Heating for a same-day gas leak engineer.

Common Causes of Gas Leaks

Gas leaks can develop for a number of reasons. These are the most common causes our engineers encounter:

• Corroded or ageing gas pipework — particularly in older properties
• Loose or poorly sealed pipe fittings and joints
• Faulty or deteriorating gas appliances — boilers, cookers, fires
• Old or damaged gas meters and meter connections
• Poorly installed boilers or appliances — including DIY work or non-Gas Safe installations
• Physical damage to pipework caused by building or renovation work
• Ground movement or subsidence affecting buried gas pipes

If you suspect a gas leak anywhere on your property — inside or outside — call us immediately. Our gas leak engineers cover London and Hertfordshire 24 hours a day, every day of the year.

What to Expect from Our Service

When you call AG Heating about a gas leak, here’s exactly what happens:

• Call us — we answer 24/7, day or night, 365 days a year
• A Gas Safe registered engineer is dispatched to your property as quickly as possible
• We carry out a full gas leak investigation using electronic detectors and pressure testing
• The source of the leak is located and either repaired or isolated to make the property safe
• A gas tightness test is carried out to confirm the system is safe before we leave
• A Gas Safe certificate is issued confirming all work carried out
• Everything is explained clearly and your questions are answered before we leave

No guesswork. No unnecessary work. Just fast, professional gas leak detection you can trust.