Smell gas? This is serious. Gas leaks can cause explosions, fires, and carbon monoxide poisoning. If you smell gas right now, open windows, don't touch electrical switches, get everyone outside, and call the National Gas Emergency Service on 0800 111 999 immediately. Once they've made the area safe, call HeatBox to locate and repair the leak.
We provide emergency gas leak detection and repair across South London – Bexley, Greenwich, Lewisham, Bromley, Croydon, and all surrounding areas, plus extended coverage to Central London and Wandsworth. Our Gas Safe registered engineers use professional leak detection equipment to find leaks accurately and repair them permanently. Available 24/7 because gas emergencies don't wait for business hours.
Gas leaks aren't always obvious. Here's what to watch for in your South London property:
Natural gas is odourless, but suppliers add a distinctive sulphur smell (like rotten eggs) so you can detect leaks. If you smell this anywhere in your property – near the boiler, cooker, meter, or pipework – take it seriously. Even faint smells indicate gas escaping somewhere.
Gas escaping from pipes or fittings often makes a hissing or whistling sound. The louder the sound, the larger the leak. If you hear unusual sounds near gas appliances or pipework, investigate carefully without using electrical switches.
Indoor plants near gas leaks often die or show yellowing leaves. Gas displaces oxygen and affects plant health. If houseplants near gas appliances suddenly decline for no obvious reason, consider gas leak as a possible cause.
Unexplained increases in gas bills can indicate a leak. If your usage hasn't changed but bills have jumped significantly, gas may be escaping before reaching your appliances. Worth investigating even without other symptoms.
Gas exposure causes headaches, dizziness, nausea, fatigue, and breathing difficulties. If multiple household members experience these symptoms that improve when leaving the property, suspect gas leak or carbon monoxide. Seek fresh air immediately.
Pilot lights that frequently blow out or burn orange/yellow instead of blue indicate combustion problems – potentially from gas supply issues or leaks affecting air mixture. Don't repeatedly relight without investigation.
Corrosion, damage, or deterioration on visible gas pipework suggests potential leak points. Old installations, DIY modifications, or physical damage from building work all create leak risks.
We focus on South London rather than spreading thin across the entire capital. All our engineers are based locally – when you have a gas emergency in Bexley or Greenwich, we can respond quickly because we're already in the area.
All our engineers are Gas Safe registered – the legal requirement for any gas work in the UK. Gas leak repair is specialised work requiring proper certification, training, and equipment. Never let unregistered traders work on gas – it's illegal and dangerous.
We use electronic gas detectors and pressure testing equipment to locate leaks accurately. Guesswork isn't acceptable with gas safety. Our equipment detects even small leaks that might be missed by smell alone, ensuring we find and fix every problem.
Gas emergencies don't respect business hours. We provide genuine 24/7 availability for gas leak emergencies across South London. Nights, weekends, bank holidays – when you need us, we're available.
Gas work carries inherent risks. We're fully insured for all gas leak detection and repair work, providing complete peace of mind. Our insurance covers any unlikely incidents during repair.
We repair gas leaks properly – replacing damaged sections, renewing fittings, and testing thoroughly afterwards. No temporary patches or bodge jobs. Your repair will be safe and lasting.
After any gas leak repair, we test the entire system for safety. Pressure testing confirms no other leaks exist. We check all appliances operate correctly and safely before leaving your South London property.
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Gas leaks can occur anywhere in your gas supply system. We check all potential problem areas:
The meter and its connections are common leak points, especially in older installations. Corrosion, movement, or deteriorating seals can cause leaks. We check meter connections and the supply pipe entering your property.
Where gas pipework connects to your boiler is a frequent leak location. Vibration from boiler operation can loosen fittings over time. Internal boiler gas valves can also develop leaks.
Flexible connectors to cookers deteriorate with age and movement. Cookers that have been moved for cleaning or kitchen work may have disturbed connections. Bayonet fittings can wear and leak.
Gas fires, especially older decorative fires, have multiple connection points that can leak. Isolation valves, flexible connections, and burner assemblies all require checking.
Every joint in your gas pipework is a potential leak point. Compression fittings, soldered joints, and threaded connections can all fail. Older properties with original pipework are higher risk.
Pipes running under floors, through walls, or underground can corrode and leak without visible signs. These leaks are harder to detect but our equipment can identify pressure drops indicating hidden problems.
Don't worry – our engineers can identify and repair any boiler. Call us for expert diagnosis and repair.
What actually happens when you call for emergency boiler repair—from first contact to 12-month guarantee.
When we arrive, we assess the immediate situation. Is the gas supply isolated? Is the property ventilated? Are occupants safe? If National Gas Emergency Service hasn't attended, we may need to make the area safe first.
Your Gas Safe engineer arrives at the agreed time with diagnostic equipment, common parts, and testing tools. We call ahead if running early or late – we respect your time.
We isolate sections of pipework and pressure test to identify which sections have leaks. This methodical approach locates hidden leaks in concealed or underground pipework that can't be accessed directly.
Once we've found all leak locations, we explain what's wrong and what repairs are needed. You'll understand exactly where the problem is before we quote for repairs.
We provide a clear quote for all necessary repairs before starting work. You know the cost upfront – no surprises. For emergency situations, we proceed quickly while keeping you informed.
Depending on the leak location and cause, repairs may involve tightening fittings, replacing seals, renewing pipe sections, or replacing damaged components. We use appropriate materials and methods for permanent repair.
After repairs, we pressure test the entire system again to confirm all leaks are fixed. We won't restore gas supply until testing confirms the system is completely gas-tight.
Once the system passes testing, we restore gas supply and check all appliances operate safely. Boilers, cookers, and fires are relit and tested for correct operation. You receive confirmation your system is safe.
Costs vary significantly based on leak location and repair complexity:
Several factors influence the final cost of gas leak repairs:
Accessible leaks at visible fittings are quickest and cheapest to repair. Concealed leaks behind walls, under floors, or in difficult spaces take longer and cost more. Underground leaks may require excavation.
Single leak repairs are straightforward. Multiple leaks throughout the system indicate widespread problems requiring more extensive work. Older systems often have several deteriorating joints.
If pipework is generally sound, individual repairs work well. If pipes are corroded throughout, section replacement or complete repiping may be more economical than repeated repairs.
Simple fitting replacement is quick. Pipe section replacement requires cutting, threading or compression fitting, and testing. Working in tight spaces or around other services adds time.
Daytime weekday rates are standard. Evening, night, and weekend callouts carry premium rates reflecting out-of-hours availability. Gas emergencies require immediate response regardless of timing.
South London's diverse property types each present specific gas leak considerations:
Period properties common across Greenwich, Blackheath, Dulwich, and Forest Hill often have original or very old gas pipework. Lead pipes, imperial fittings, and decades of thermal movement create leak risks. These properties need careful assessment and often benefit from pipework upgrades.
Predominant across Bexley, Bromley, and Streatham. Gas installations from this era may have been modified multiple times. Mixed pipework materials and aged joints are common leak sources. Generally accessible pipework makes repairs straightforward.
Combination boilers dominate South London flats. Kitchen cupboard installations require adequate ventilation. High-rise properties can have pressure issues due to height. Communal systems in some developments require specialist knowledge.
Greenwich Peninsula, Woolwich Arsenal, and Canada Water properties have newer gas installations that should be leak-free. If leaks develop in newer properties, installation defects or damage during other work are likely causes.
Lewisham, Catford, and Peckham properties often have system boilers with separate hot water cylinders. More components mean more potential fault points. We service the complete system, not just the boiler.
Thames Water serves South London with high mineral content (250-320mg/l calcium carbonate) – significantly harder than many other areas.
Limescale builds up inside heat exchangers causing efficiency loss and kettling noises. Pump impellers clog with debris. Diverter valves stick from scale deposits. Many repairs we do in South London are directly caused by hard water damage.
After repairs, we recommend inhibitor treatment to protect your system. Magnetic filters catch debris before it damages components. For severe cases, powerflush clears accumulated sludge. Prevention saves money long-term in South London's challenging water conditions.
Legal requirements every engineer must follow and why they exist
All gas work in the UK must be carried out by Gas Safe registered engineers. This is law, not guidance. Using unregistered workers for gas repairs is illegal and extremely dangerous. Prosecution can follow illegal gas work.
Following gas leak repair, we test and certify the system is safe. You receive documentation of the work completed. For landlord properties, this documentation supports your gas safety compliance.
The National Gas Emergency Service (0800 111 999) makes situations safe by isolating gas supply. They don't repair leaks – that's our job. Once they've attended, call us for detection and repair.
Property owners are responsible for gas safety within their property (after the meter). Report any suspected leaks immediately. Don't attempt DIY gas repairs – ever. Maintain appliances with annual servicing.
All our engineers are Gas Safe registered with £5M public liability insurance. We comply with all Building Regulations, provide landlord certificates, and maintain complete legal compliance for every job across London.
HeatBox provides boiler repairs with specialist focus on South and South East London:
South & South East London Specialists
Not all heating problems are equal—here's how to determine if you need emergency callout
Not sure if you have an emergency? Call us and we'll help you assess urgency and prioritise accordingly across our London coverage areas.
What to expect when we repair your boiler
If National Gas Emergency hasn't attended a serious leak, call them first. Keep the property ventilated. Don't use any gas appliances. Note where you smell gas strongest – this helps our investigation.
We'll assess the situation, use detection equipment to locate leaks, and explain what we find. For repairs, we'll quote costs before proceeding. Work duration depends on leak location and complexity – simple repairs take 1-2 hours, complex work longer.
Your gas supply is restored and all appliances tested. We demonstrate everything works safely. You receive documentation of work completed. The gas smell should be completely gone – if you notice anything afterwards, call us immediately.
Annual boiler servicing includes gas connection checks. Report any new gas smells promptly. If planning building work, inform contractors about gas pipe locations. Consider upgrading very old gas pipework proactively.
Customers who booked boiler repairs also used:
Boiler problems following gas work? We provide 24/7 emergency boiler repair across South London.
Annual servicing includes gas connection checks, helping identify potential leak points before they become problems. From £90.
Required annually for rental properties. Includes safety checks on all gas appliances and pipework. From £80.
Old boiler with deteriorating gas connections? New installation includes all new gas connections with warranty.
Complete system installation including new gas pipework where needed.
Over 15 years serving London with transparent pricing, specialist knowledge, and genuine emergency response. No corporate markup, just honest local service.
Open windows, don't touch electrical switches, get everyone outside, and call National Gas Emergency Service on 0800 111 999. Once they've made the area safe, call HeatBox for leak detection and repair. Don't delay – gas leaks are serious.
Callout starts from £80 in Zone 1 (weekday daytime). Repair costs depend on leak location and complexity – simple fixes £50-£100, concealed pipe repairs £250-£500, major work from £500. We quote before starting repairs.
Yes – we use electronic detectors and pressure testing to find leaks in concealed pipework, underground pipes, and inaccessible locations. Our equipment detects leaks that can't be found by smell alone.
Simple accessible repairs take 1-2 hours including testing. Concealed leaks requiring access work take longer. We confirm timescales after assessing the leak location.
For significant leaks (strong smell, hissing sound), yes – call 0800 111 999 first. They make situations safe. For minor concerns or suspected small leaks, you can call us directly for detection and assessment.
Yes – gas supply must be isolated during leak repair for safety. We restore supply once repairs pass testing. For simple repairs, you'll be without gas for a few hours. Complex repairs may take longer.
Usually yes – we can repair or replace sections as needed. Very old or corroded systems may need more extensive work. We'll advise honestly if widespread replacement is more economical than multiple repairs.
Yes – we provide documentation of all gas work completed. For landlord properties, this supports your compliance records. All work is completed to Gas Safe standards.
Gas leaks are serious – don't delay. If you smell gas, call National Gas Emergency (0800 111 999) first. Then call HeatBox for professional leak detection and repair.
Serving Bexley, Greenwich, Lewisham, Bromley, Croydon & All South London
Available 24/7 | Gas Safe Registered | Fully Insured
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