Service hub
Gas Safety across London
Gas safety / CP12 from a directly-employed team, dispatched 24/7. Same fixed pricing, same 30 to 60 minute target response, same 12-month guarantee, every borough.
Specialist guides
Gas safety / CP12: deeper dives
Per-job guides covering scope, pricing, and how we handle the awkward bits.
CP12 landlord certificate
Specialist guide covering CP12 landlord certificate across London.
Read →Emergency gas leak diagnostics
Specialist guide covering emergency gas leak diagnostics across London.
Read →Landlord packages
Specialist guide covering landlord packages across London.
Read →Cooker installation
Specialist guide covering cooker installation across London.
Read →Gas hob installation
Specialist guide covering gas hob installation across London.
Read →Gas pipe repair
Specialist guide covering gas pipe repair across London.
Read →Gas fire service and safety check
Specialist guide covering gas fire service and safety check across London.
Read →Emergency gas shut-off and isolation
Specialist guide covering emergency gas shut-off and isolation across London.
Read →Symptoms
Signs of a gas problem
Spotting the early signs saves money. Each of these symptoms is a reason to call a qualified engineer before it becomes an emergency.
⚠️ Smell of gas (rotten eggs / sulphur)
Natural gas has an odorant added (mercaptan). If you smell it, leave the property, don't switch lights, call National Gas 0800 111 999. Then call us.
⚠️ Yellow or orange flame on a gas appliance
Should be sharp blue. Yellow indicates incomplete combustion and possible carbon monoxide production. Stop using and book a Gas Safe inspection.
⚠️ Soot stains around appliance vents or flues
Sign of incomplete combustion. CO risk. Service required immediately.
⚠️ Pilot light keeps blowing out (older boilers/heaters)
Often draught or thermocouple failure. Could indicate flue downdraught issues, needs Gas Safe inspection.
⚠️ Excessive condensation on windows when boiler running
Possible flue or combustion problem. Worth a flue gas analysis test.
⚠️ Headaches, nausea or drowsiness when the heating is on
Possible CO poisoning. Leave the property immediately, get fresh air, and call 999 if symptoms persist. Have all appliances checked by Gas Safe before reuse.
⚠️ Higher than expected gas bills
Could indicate a leak (rare), more often a failing appliance or thermostat issue. Worth investigating.
⚠️ Hissing sound near gas pipework or meter
Possible gas leak. Treat as emergency. Don't approach with naked flame or electrical switches.
How we work
Our Gas Safe engineer process.
No surprises, no “I'll need to come back tomorrow”. This is the exact path every gas safety / CP12 job follows.
- Booking confirmed, Gas Safe ID provided in advanceWe send the engineer's name and Gas Safe Register ID before arrival so you can verify.
- Property arrival, meter checkEngineer checks the meter, isolates supply if needed, performs initial tightness test.
- Inspection of all in-scope appliances and pipeworkPer Gas Safe / ACS protocol, visual, mechanical and combustion checks.
- Flue gas analysis (FGA)Combustion efficiency, CO and CO₂ readings, flue performance, all recorded.
- Defect classificationPer Gas Safe guidance, At Risk, Immediately Dangerous, Not to Current Standards. Customer fully informed.
- Repair / certification / decommissioningDepending on findings. Customer always quoted before any chargeable work.
- Certificate issued (CP12 / Benchmark / Service Record)Same-day digital copy to customer. Landlord copies sent to landlord and tenant.
- Building Regs notification (where required)Gas Safe Register handles notification within 30 days automatically.
London context
Gas safety / CP12 in London: what makes it different.
Cadent Gas / SGN. Most of London is supplied by Cadent Gas (formerly National Grid Gas Distribution). Some south-of-Thames postcodes are SGN. We work across both networks.
HMO and rental compliance. The London rental market is heavily HMO-dominated, with corresponding gas safety obligations. We carry out HMO-specific multi-appliance CP12 inspections across every London borough, with the licensing and compliance documentation each council requires.
Older property gas pipework. Many Victorian and Edwardian London terraces still have black iron pipework dating from the original gas-light era. Iron pipework is acceptable but requires more rigorous tightness testing than modern copper. We have specialist tightness-testing equipment for older systems.
Block-management requirements. Communal heating systems in flats, common in postwar mansion blocks, have specific compliance requirements managed at the block level. We can hold landlord-side gas compliance for managing agents at portfolio scale.
Need a 24/7 emergency engineer?
30 to 60 minute response across every London borough. Gas Safe registered. 12-month workmanship guarantee.
Borough coverage
Gas safety / CP12 in your borough
Every London borough has its own page with local postcodes, scenarios, and pricing. Pick yours below or use the postcode checker on the homepage.
Gas safety / CP12 in Barking and Dagenham
Coverage across RM6, RM8, RM9, RM10 and the rest of the borough.
See Barking and Dagenham →Gas safety / CP12 in Barnet
Coverage across EN4, EN5, HA8, N2 and the rest of the borough.
See Barnet →Gas safety / CP12 in Bexley
Coverage across DA1, DA5, DA6, DA7 and the rest of the borough.
See Bexley →Gas safety / CP12 in Brent
Coverage across NW2, NW6, NW9, NW10 and the rest of the borough.
See Brent →Gas safety / CP12 in Bromley
Coverage across BR1, BR2, BR3, BR4 and the rest of the borough.
See Bromley →Gas safety / CP12 in Camden
Coverage across NW1, NW3, NW5, WC1 and the rest of the borough.
See Camden →Gas safety / CP12 in City of London
Coverage across EC1, EC2, EC3, EC4 and the rest of the borough.
See City of London →Gas safety / CP12 in Croydon
Coverage across CR0, CR2, CR3, CR4 and the rest of the borough.
See Croydon →Gas safety / CP12 in Ealing
Coverage across W3, W5, W7, W13 and the rest of the borough.
See Ealing →Gas safety / CP12 in Enfield
Coverage across EN1, EN2, EN3, EN4 and the rest of the borough.
See Enfield →FAQ
Gas safety / CP12: your questions
How fast can a Gas Safe engineer reach me?
How does gas safety / CP12 pricing work?
Do you charge to come out and look?
Are you Gas Safe registered?
Do you guarantee the work?
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