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Gas Safe engineers NICEIC engineers Fully Insured
Gas engineer carrying out CP12 safety inspection London
Gas Safety, London

CP12 Gas Safety Certificate London.

Legal requirement for all landlords. Gas Safe registered engineers check every gas appliance and flue and issue the CP12 the same day. Contact us for a quote. Part of GMAS Group's wider refurbishment and landlord-compliance service.

Fixed
Price agreed upfront
Same day
Certificate issued
All London
Boroughs covered
How it is priced
Fixed prices, no hidden charges. Congestion charge may apply in central London.
1 appliance (boiler)
Gas boiler safety check and flue inspection
Fixed quote
2 appliances
Boiler plus one additional gas appliance
Fixed quote
Quoted on appliances
3+ appliances
Full property, boiler, hob, fire and any others
Fixed quote
Quoted on appliances
HMO / multi-let
Full property including all individual units
Fixed quote
Free quote
What is a CP12?

What is a
CP12 certificate?

A CP12, officially called a Gas Safety Record, is the certificate issued after a Gas Safe registered engineer has checked every gas appliance, fitting and flue in a rented home. The name CP12 comes from the old form and is still the usual shorthand.

Landlords need a new one every 12 months. Tenants must get a copy within 28 days of the check, new tenants before they move in, and each record must be kept for at least two years.

Why choose us

Why London
landlords choose us.

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.

Same-day certificates

The record is emailed the same day as the check.

All appliances covered

Boilers, hobs, fires and flues are all checked and recorded.

Combined with other compliance

Book the EICR and EPC in the same visit.

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.

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

What a landlord gas

safety check covers.

A landlord gas safety check is more than a look at the boiler. A Gas Safe registered engineer checks every gas appliance and flue you provide and records each one on the record. Tenant-owned appliances are not covered, though the pipework serving them is usually checked.

Appliances and flues

Each appliance is checked for correct operation, burner condition and a safe flame picture. Flues are inspected and tested so that combustion gases are carried outside, and open flued appliances such as older gas fires get a spillage test.

Pipework and the meter

The installation is tested for gas tightness where needed, the visible pipework is checked for condition and support, and the emergency control valve at the meter must be accessible and working.

Ventilation and safety devices

Rooms with gas appliances must have the ventilation the appliance needs. Flame failure devices, pressure settings and other safety controls are checked so the appliance shuts down safely if something goes wrong.

Carbon monoxide alarms

In England, landlords must fit a carbon monoxide alarm in any room used as living accommodation that has a fixed combustion appliance, other than a gas cooker. Alarms must be working at the start of each tenancy.

Your duties

The legal detail

for London landlords.

The Gas Safety (Installation and Use) Regulations 1998 set the rules. They apply to almost every residential let, including flats, houses, HMOs, student lets and holiday or short lets.

Every 12 months

Each appliance and flue you provide must be checked at least every 12 months, and booking up to two months early keeps the original expiry date.

Copies and records

Existing tenants must receive a copy within 28 days of the check and new tenants before they move in. Keep each record for at least two years.

When tenants refuse access

You must take all reasonable steps to get access. Keep a written record of the dates you offered and how you contacted the tenant, because that evidence matters if the check is late.

Agents and managing companies

Many London landlords pass the job to a letting agent. The duty can be shared through the management agreement, but it is worth checking the agent actually holds a current record for your property.

If an appliance fails

What the engineer

does with a fault.

Faults are classified under the gas industry unsafe situations procedure, so the record shows clearly how serious each one is and what has been done about it.

Immediately dangerous

An appliance that is a danger to life is disconnected from the gas supply, with your permission, and labelled so it cannot be used until it is repaired.

At risk

An appliance with a fault that could become dangerous is turned off, with consent, and you are advised on the repair needed.

Not to current standards

Older installations that are safe to use but would not meet today's standards are noted as advice. They do not stop the record being issued.

Getting it fixed

Where repairs are needed we quote them in writing, and once the work is done the appliance is rechecked and added to the record.

Common questions

Questions
answered.

What is a CP12 certificate?
It is the landlord gas safety record: a yearly check of every gas appliance, fitting and flue in a rented home by a Gas Safe registered engineer, with a copy given to tenants.
Which areas of London do you cover for CP12s?
All 32 boroughs, with local pages for Chelsea, Clapham, Fulham, Kensington, Wimbledon, Marylebone, Paddington, Belgravia, St John's Wood and Maida Vale.
Can I book the check early without losing my renewal date?
Yes. A gas safety check carried out up to two months before the current record expires keeps the original expiry date, so the new record runs for 12 months from that date.
Do I need a carbon monoxide alarm in my rental?
In England a carbon monoxide alarm is required in any room used as living accommodation that has a fixed combustion appliance, other than a gas cooker. It must be working at the start of each new tenancy.
How long do I need to keep the gas safety record?
Keep each Landlord Gas Safety Record for at least two years, and give a copy to existing tenants within 28 days of the check and to new tenants before they move in.
How long does a CP12 inspection take?
For a typical property with one boiler, the inspection takes around 30 to 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.

Get in touch

Request a callback.

Leave your details and we'll call you back within the hour during working hours.

Coverage

Areas we cover.

We take gas safety certificate work across all 32 London boroughs. Most of our work is in west London, in Shepherd's Bush, Hammersmith, Fulham, Kensington, Chiswick and White City, and in south west London, in Putney, Wandsworth and Wimbledon. We also work in south east London, in Greenwich, Blackheath and Lewisham.

If your property is outside these areas, call us anyway. We travel across London and will tell you honestly if a job is too far to price properly.

Local pages: CP12 in Chelsea, CP12 in Clapham, CP12 in Fulham, CP12 in Kensington, CP12 in Wimbledon, CP12 in Marylebone, CP12 in Paddington, CP12 in Belgravia, CP12 in St John's Wood, CP12 in Maida Vale

Message us
Call GMAS on 07498 597339