If you smell gas or suspect a leak right now: turn off the emergency control valve at your gas meter, open all windows and doors, put out any naked flames, do not touch light switches or plug sockets, leave the property, and call the National Gas Emergency Service on 0800 111 999. Once you’re safe, call us on 020 7183 4810 and we’ll get a Gas Safe registered engineer out to fix it in South West London.
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Once a leak has been found — whether by us, another engineer, or a warning notice from your gas supplier — it needs a proper, certified repair before your supply can be safely reinstated. Here’s what that involves.
Common causes of a gas leak
- A corroded or damaged section of copper pipework. Common in older properties where pipework has aged or been disturbed by other building work.
- A loose or degraded joint or union. Fittings can work loose or perish over time, especially around appliance connections.
- A faulty appliance connector or isolation valve. Flexible hoses and valves have a service life and can fail.
- Damage from other trades. Pipework nicked or disturbed during unrelated building, flooring or renovation work.
- A supplier warning notice on your meter. Cadent or SGN can isolate a supply if their own checks flag a suspected leak.
Why this always needs a certified repair, not a quick fix
| The shortcut | What actually goes wrong |
|---|---|
| “I’ll just tighten it myself and see if that stops it” | Working on gas pipework is illegal for anyone who isn’t Gas Safe registered, and a fitting that’s been tightened without a proper seal can still leak. |
| “I’ll use some sealant or tape from the hardware shop” | General-purpose sealants aren’t rated for gas pipework and won’t give a certified, tested repair — it can look fixed while still leaking. |
| “I’ll turn the gas back on and check later” | A repair has to be pressure-tested before the supply is restored. Turning it back on without that test risks the same fault recurring undetected. |
| “It’s a small section, any handyman can swap the pipe” | Any work on gas pipework, however small, must be carried out and certified by a Gas Safe registered engineer by law. |
Stop and call us now if…
- You’ve been told by your gas supplier there’s a warning notice on your meter
- A leak has already been located but not yet repaired
- You can still smell gas after the supply has been turned off at the meter
- Building or renovation work nearby may have disturbed existing gas pipework
What it costs to leave it
A known leak left unrepaired means your gas supply stays isolated, or the risk stays live if it hasn’t been turned off — neither is something to live with while you shop around. Gas that continues to escape is also gas you’re paying for and not using. Getting a certified repair done promptly is the only way to get your supply safely reinstated.
How Olia’s Plumbing & Heating handles it
- Confirm the fault. We verify the exact location and cause before starting any repair.
- Fixed quote. Clear pricing agreed before work begins.
- Repair. Damaged pipework, joints or fittings replaced with the correct certified materials.
- Pressure test. A full retest confirms zero pressure loss before the supply is restored.
- Certify and clear notices. We provide documentation and liaise with Cadent or SGN to clear any warning notice.
- Gas Safe registered, 24/7 emergency response
- Fixed price agreed before we start
- Full pressure testing and certification on every repair
- Covering South West London and the surrounding area
Get your gas leak repaired and certified.
24/7 response across South West London.
Frequently Asked Questions
How quickly can you repair a confirmed gas leak?
We treat confirmed leaks as emergencies and aim to attend as quickly as possible. Call 020 7183 4810 for a realistic window.
Will my gas supply be off until it’s repaired?
Yes, for safety, and it will stay off until the repair is complete and pressure-tested.
Can you clear a warning notice from Cadent or SGN?
Yes — we carry out the repair, retest the system and provide the documentation needed to get your supply reinstated.
Do I get a certificate after the repair?
Yes — full documentation confirming the repair and pressure test, for your records and for your supplier.
What if the leak was found during a landlord inspection?
We can repair it and issue an updated CP12 once the fix is confirmed safe. See our Landlord Gas Inspection South West London page.
Book a gas leak repair in South West London
Call 020 7183 4810 for a certified, Gas Safe registered gas leak repair.
Related services: Gas Leak Detection South West London · Gas Engineer South West London · Why Is Gas Safety Necessary · Landlord Gas Inspection South West London
Peyman
CEO & Founder — Gas Safe Registered Engineer
Peyman is the founder of Olia's Plumbing & Heating, a London based team with over 15 years of hands on experience in boiler installation and repair, central heating, gas work and emergency plumbing. He personally oversees jobs across Central and West London and writes these guides to help homeowners understand their heating systems.
- Gas Safe Registered
- 15+ years experience
- Covering all of London
