Gas Engineers — London
Gas Safe engineers in London
Gas Safe registered engineers covering all 33 London boroughs. Boiler repair, annual service, Gas Safety Certificates, gas leak investigation and new gas appliance installation. 180+ verified reviews.
Gas Safe Registered
All gas engineers verified on Gas Safe Register
It is a legal requirement
Under the Gas Safety (Installation and Use) Regulations 1998, only Gas Safe registered engineers may legally carry out work on gas fittings and appliances in Great Britain. Using an unregistered engineer is a criminal offence.
Verify before they start
Ask to see the engineer's Gas Safe ID card. It shows their name, photograph, registration number and — critically — the appliance categories they are qualified to work on. Check online at gassaferegister.co.uk.
Insurance implications
Buildings and contents insurance policies typically exclude damage caused by work carried out by unregistered tradespeople. Gas Safety Certificates are required documentation for most rental property insurance policies.
Services
Gas engineering services in London
Gas Safety Certificates (CP12)
Annual landlord gas safety inspections covering all fixed gas appliances, pipework and flues. Certificate issued on the day. Accepted by all London local authorities and letting agents. Reminder service available for portfolio landlords.
Learn moreBoiler repair London
Fault diagnosis and repair on all major gas boiler brands — Worcester Bosch, Vaillant, Baxi, Ideal, Glow-worm, Viessmann, Potterton. Gas Safe engineers carry common spare parts for same-visit repair where possible.
Learn moreBoiler installation
New gas boiler supply and installation. Combi boiler replacement, system boiler upgrades, heat-only boiler conversions. Gas Safe notification to Building Control. Manufacturer warranty registration. Benchmark commissioning document issued.
Learn moreAnnual boiler service
Full annual boiler service including combustion analysis, flue check, heat exchanger inspection, burner cleaning, condensate trap and pressure relief valve check. Maintains manufacturer warranty. Identifies faults before breakdown.
Learn moreGas leak investigation
Gas leak detection using electronic gas detection equipment. Pipework soundness testing. Unsafe appliance isolation. Emergency attendance available 24/7. Reinstatement of supply once the source is identified and made safe.
Learn moreCentral heating installation & repair
New central heating system installation. Radiator additions and replacements. Thermostatic radiator valve fitting. Power flush. System balancing. Magnetic filter installation. Zone control and smart thermostat wiring.
Learn moreGas appliance installation
Gas Safe installation of gas hobs, gas cookers, gas fires and gas barbecues. New gas supply runs. Meter box relocation and gas meter upgrade applications. All pipework to BS 6891 and IGE/UP/2.
Learn moreLandlord compliance packages
Combined CP12 gas safety + EICR electrical inspection + legionella risk assessment packages. Portfolio pricing for 5+ properties. Certificate management and renewal reminders. Section 11 reactive maintenance service.
Learn moreLandlords
Gas Safety Certificates for London landlords
Every landlord letting residential property in England must have an annual Gas Safety Certificate (CP12) for all gas appliances. The certificate must be given to existing tenants within 28 days of the inspection, and to new tenants before they move in.
The inspection covers: all fixed gas appliances (boilers, gas fires, gas hobs), visual inspection of visible pipework and fittings, flue flow and integrity test, combustion analysis and operative pressure check. If an appliance fails it is isolated and a notice of defect is issued — the engineer will advise on repair or replacement.
We offer portfolio-rate pricing for landlords with multiple properties. All certificates are issued digitally with PDF copies for your records. Renewal reminders available.
Gas Safety Certificates£6,000
Maximum fine for failing to provide a valid Gas Safety Certificate
12 months
Maximum validity period of a Gas Safety Certificate
28 days
Maximum period to provide certificate to existing tenants after inspection
2 years
Minimum record-keeping period for landlord Gas Safety Certificates
FAQ
Gas engineer questions answered
What is a Gas Safe registered engineer?
Gas Safe is the official gas registration body for Great Britain, replacing CORGI in 2009. It is a legal requirement that any engineer working on gas appliances, pipework or flues must be registered with Gas Safe. You can verify any engineer's registration by asking to see their Gas Safe card — it carries their name, photo, registration number and the appliance types they are qualified to work on. Never allow a non-registered engineer to work on gas appliances.
Do I need a Gas Safety Certificate every year?
If you are a landlord, yes — the Gas Safety (Installation and Use) Regulations 1998 require an annual Gas Safety Certificate (CP12) for all gas appliances in rental properties. The certificate must be provided to tenants within 28 days of the inspection or before a new tenancy begins. Failure to comply carries a penalty of up to £6,000 or six months imprisonment. Homeowners do not have a legal obligation for annual certificates but an annual boiler service is strongly recommended to maintain efficiency and warranty conditions.
What should I do if I smell gas in London?
If you suspect a gas leak: do not switch any electrical switches on or off, do not use naked flames, open doors and windows to ventilate, evacuate the building, and call the National Gas Emergency Service on 0800 111 999 (free, 24 hours). Do not call an engineer — the National Gas Emergency number handles the initial response. Once the emergency is made safe, call a Gas Safe engineer to investigate the source and carry out permanent repairs.
Can a gas engineer work on an oil boiler?
No. Gas Safe registration covers natural gas and LPG. Oil-fired boiler work requires OFTEC (Oil Firing Technical Association) registration. Prestige Engineers are Gas Safe registered and cover all gas appliance work. For oil boilers, a separate OFTEC engineer is required. Most London properties use natural gas — OFTEC is more relevant in rural areas where mains gas is not available.
How much does a gas safety certificate cost in London?
Gas Safety Certificate costs in London typically range from £70-120 for a standard residential property with one boiler and one gas hob. Properties with additional gas appliances (gas fires, additional hobs) are slightly higher. The inspection covers all fixed gas appliances, pipework soundness test and flue performance check. The certificate is issued immediately on successful completion.
Book a Gas Safe engineer in London
Boiler repairs, Gas Safety Certificates and central heating. Same-day available.