Landlord Gas Safety Certificate London (CP12)
Landlord Gas Safety Certificate (CP12) Help Centre
What a CP12 includes, who needs it, and how to book a Gas Safe engineer in London.
We provide CP12 landlord gas safety certificates across London.
Gas Safe registered engineers for compliant checks and clear reporting.
24/7 availability with London wide call handling and booking.
CP12 Gas Safety Certificate London (Gas Safe)
Need a landlord gas safety certificate? Tell us your postcode, property type, and how many gas appliances you have and we will advise the quickest booking slot.
📞 Call 0203 695 3137
Request Call Back
Fast triage: postcode, number of appliances (boiler, hob, fire), tenant availability, and whether there are any known faults.
⚠️ Safety First
Smell gas? Leave the property and call the National Gas Emergency Line: 0800 111 999.
Carbon monoxide alarm sounding? Get everyone out immediately and call 999. Learn more about carbon monoxide safety.
Boiler in lockout? Note the fault code and avoid repeated resets. We can advise whether repair is needed before certification.
Jump to: Who Needs a CP12 · What’s Included · Appliances Covered · FAQs
Who Needs a CP12?
If you rent out a property with gas appliances, you normally need an annual landlord gas safety check and certificate (CP12). It helps confirm appliances have been checked for safe operation and provides documentation for compliance and tenant records.
If you are a tenant with no heating or hot water, contact your landlord first. Landlords can book a repair via request call back.
What a CP12 Includes
- Appliance safety checks: boiler and other gas appliances tested as applicable
- Flue and ventilation checks: signs of unsafe combustion and correct flue operation
- Safety device checks: basic confirmation that safety devices are functioning where applicable
- Visual inspection: leaks, corrosion, obvious defects and unsafe conditions
- Clear documentation: certificate details recorded for landlord and tenant
What Appliances Can Be Covered
- Gas boiler (combi, system, heat only)
- Gas hob or cooker
- Gas fire (where installed)
If you are unsure what you have, tell us what is in the property and we will guide you.
Common Issues That Can Delay Certification
- Boiler faults or lockouts: repairs may be required before a pass can be issued
- Unsafe flue or ventilation conditions: must be corrected
- System issues: pressure drops, leaks, or circulation problems
If you have cold radiators or a noisy system, a power flush may be recommended after repairs to improve reliability.
🔧 CP12 Due and Boiler Unreliable?
If your boiler keeps locking out, it is often better to fix the root cause first, then complete the certificate. If the boiler is 10 to 15 years old and repairs are stacking up, use our repair or replace guide and consider new boiler installation.
CP12 FAQs
How often do I need a CP12?
Typically once every 12 months for rented properties with gas appliances.
Is a boiler service the same as a CP12?
No. A boiler service is maintenance. A CP12 is a landlord gas safety certificate. Many landlords do both for best reliability. Book servicing here: boiler servicing.
What if the boiler fails the check?
If a fault or unsafe condition is found, repairs may be needed before a pass can be issued. We will explain the issue clearly and advise the next steps.
Can you do CP12 across all London boroughs?
Yes. See coverage: London coverage.
Related Services
Power Flush
New Boiler Installation
Boiler Manufacturers
London Coverage
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Speak to our team and we will arrange a suitable time for your landlord gas safety check.
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