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Gas engineer carrying out CP12 safety inspection London
Gas Safety — London

Gas Safety
Certificate
CP12 London.

Legal requirement for all landlords. Our qualified gas engineers inspect every gas appliance and flue, issuing your CP12 certificate the same day. Contact us for a quote. Part of GMAS Group's wider refurbishment and landlord-compliance service.

Book a CP12 Call 07498 597339
£60
From, 1–2 appliances
Same day
Certificate issued
All London
Boroughs covered
Pricing
Fixed prices, no hidden charges. Congestion charge may apply in central London.
1 appliance (boiler)
Gas boiler safety check and flue inspection
£60
2 appliances
Boiler plus one additional gas appliance
£75
3+ appliances
Full property — boiler, hob, fire and any others
£130
HMO / multi-let
Full property including all individual units
POA
Free quote
Book now →

Congestion charge may apply for central London postcodes.

What is a CP12?

What is a
CP12?

A CP12 — officially called a Gas Safety Record — is the certificate issued after a qualified qualified engineer has inspected all gas appliances in a property. The name CP12 refers to the old certificate format and is still widely used as a shorthand.

The inspection covers each gas appliance (boiler, hob, fires), the flue and ventilation arrangements, operating pressures and safety devices. Any unsafe appliance is taken out of service and the defect reported to you immediately.

Landlords are legally required to hold a valid CP12 for every property and must provide a copy to existing tenants within 28 days of the check and to new tenants before they move in. The certificate must be renewed every 12 months.

Why choose us

Why London
landlords choose us.

01
Legal requirement for landlords

The Gas Safety (Installation and Use) Regulations 1998 require all landlords to have a Gas Safety Record renewed every year. Failure to comply is a criminal offence carrying an unlimited fine or up to two years in prison.

02
Same-day certificates

We email your CP12 certificate on the same day as the inspection. No chasing, no delays — you'll have documentation to hand if your letting agent or tenant asks for it.

03
All appliances covered

We inspect every gas appliance in the property including boilers, gas hobs and ranges, gas fires, back boilers and any other gas-burning equipment.

04
Combined with other compliance

We frequently carry out EICR, EPC and CP12 in a single visit, reducing the number of appointments needed and lowering the overall cost for landlords with multiple requirements.

What's included

Everything in
one visit.

Boiler inspection
Full safety check of all boiler components including heat exchanger, burner and controls
Flue & ventilation
Inspection of flue integrity, termination point and adequate ventilation to combustion areas
Gas appliances
Safety checks on hobs, fires, back boilers and all other gas-burning equipment
Pressure & flow testing
Gas pressure and operating rate checks against manufacturer specifications
Safety devices
Flame failure device and overheat thermostat operation tested on all appliances
Immediate report
CP12 certificate emailed same day; any issues flagged clearly with next steps
Defect notification
Any unsafe appliances are isolated and clearly documented for your records
Annual reminder
We contact you before your certificate expires so renewal is never missed
How it works

Simple,
straightforward.

01
Book online
Select your property type and number of appliances. Choose a date that suits you — we cover all London boroughs.
02
Engineer visits
A qualified gas engineer arrives at the agreed time and carries out the full safety inspection of all gas appliances.
03
Certificate issued
Your CP12 certificate is emailed to you the same day, ready to forward to your letting agent or tenant.
04
Annual reminder
We'll remind you before your certificate is due for renewal — you'll never be caught without a valid CP12.
Common questions

Questions
answered.

How long does a CP12 inspection take?
For a typical property with one boiler, the inspection takes around 30–45 minutes. Each additional appliance adds approximately 15 minutes.
Do tenants need to be present?
Access to all gas appliances is required, so either you or your tenant must be present. We can arrange appointments during evenings and weekends if needed.
What happens if an appliance fails?
Any appliance that cannot be made safe is immediately isolated (turned off). We'll explain the issue and recommended remedial action. A CP12 can still be issued for the appliances that do pass.
Can I get a CP12 and EICR done together?
Yes — we regularly combine both compliance certificates in a single visit. Book via the form and mention you need both — we'll give you a combined price.
Is the CP12 the same as a boiler service?
No. A CP12 is a safety inspection only. A boiler service involves cleaning components and checking for wear as part of a maintenance schedule. We recommend both annually.
London-wide service

Book your
CP12 today.

Book a CP12 Call 07498 597339
Get in touch

Request a callback.

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Message us
Call GMAS — 07498 597339