Guide
CP12 (Landlord Gas Safety Record): the UK guide
The CP12 is the annual gas safety record every landlord with gas appliances has to hold — and for Gas Safe registered engineers, it's some of the steadiest recurring work there is. Here's what the record is, who needs one, what gets checked, and the record-keeping rules around it.
This guide is general information, not legal or compliance advice.
What is a CP12 certificate?
A CP12 is the common name for the Landlord Gas Safety Record (LGSR) — the document a Gas Safe registered engineer completes after carrying out the annual gas safety check at a rented property. "CP12" was the form number in the old CORGI paperwork system, and the trade never stopped using it.
The record lists the property, the landlord or agent, the engineer and their Gas Safe registration, each appliance and flue checked, the results of the checks, and any defects found with the action taken. It's the landlord's evidence that the annual check happened — and the tenant's assurance that the gas appliances they live with have been inspected.
Who needs a landlord gas safety record?
Landlords. Under the Gas Safety (Installation and Use) Regulations 1998, anyone letting residential property must have every gas appliance and flue they provide for tenants checked for safety at least once every 12 months, by a Gas Safe registered engineer, and must keep a record of each check. That covers ordinary lets, HMOs and most other residential letting arrangements; letting agents often manage the duty day to day, but it remains the landlord's.
The duty applies to appliances and flues the landlord owns and provides. A cooker the tenant brought with them isn't the landlord's to certify — though any flue serving a landlord's appliance is. Where gas equipment serves a let property from elsewhere in a building, the safety duty can still bite, so portfolio landlords and agents should map what serves what.
There is no CP12 requirement for owner-occupied homes — the record is a condition of letting, not of owning a boiler.
What does the engineer check?
The annual check is a safety inspection of each appliance and flue, not a full service. For each appliance the engineer typically checks:
- ›The appliance is operating at the correct pressure or heat input
- ›There is adequate ventilation for the appliance to burn safely
- ›The flue or chimney is operating correctly and removing combustion products
- ›Safety devices work and shut the appliance down as designed
- ›Signs of unsafe operation — staining, scorching, incomplete combustion
If a defect is found, it's recorded on the LGSR along with the action taken. Genuinely unsafe appliances are dealt with under the industry's unsafe situations procedure — the engineer will explain, label the appliance and, with permission, disconnect what can't be left in use. A safety check is also a natural moment to book servicing: the check tells you the appliance is safe, a service keeps it that way.
Doing landlord checks every week? AllForProjects completes the LGSR on site — appliance detail, signature on the PDF, emailed to the landlord or agent with a full send history.
See the CP12 / LGSR software ›Only Gas Safe registered engineers
The check — like all gas work — may only be carried out by an engineer on the Gas Safe Register, the official registration body for gas engineers in Great Britain. Every registered engineer carries a Gas Safe ID card showing who they are and which categories of work they're qualified for. Landlords and agents should ask to see it; engineers should expect to show it.
Copies, deadlines and record-keeping
The regulations are specific about what happens to the record once it exists:
- ›Existing tenants get a copy within 28 days of the check being done
- ›New tenants get a copy of the current record before they move in
- ›The landlord keeps each record for at least two years
- ›The next check is due within 12 months — done at 10–12 months, it can keep the original anniversary date
For the engineer or firm doing the work, that turns delivery into part of the job: the landlord or agent needs the PDF promptly and provably, and the next visit needs to be in the diary before this year's record is filed. The HSE publishes guidance on landlord gas duties at hse.gov.uk.
How AllForProjects handles LGSRs
In AllForProjects the LGSR is completed in AFPro, the AllForProjects field app — appliance and inspection detail recorded against the property, the customer's signature captured on the PDF, and the finished record emailed to the landlord or agent with a full send history. Issue is gated by Gas Safe registration on the engineer's profile, and it all works offline in cellars and plant rooms, syncing when signal returns.
The annual cycle is handled with recurring jobs: next year's visit is generated in the diary automatically, so renewals come round as booked work instead of a spreadsheet of dates. See the detail on the CP12 app page, or the wider picture on software for gas engineers.
CP12 FAQs
How long does a gas safety certificate last? +
Twelve months. The gas safety check is an annual requirement, so a new record is needed every year the property is let. A landlord can have the next check done 10 to 12 months after the previous one and keep the original anniversary date, so the deadline doesn't creep earlier each year.
Is a CP12 the same as a Landlord Gas Safety Record? +
Yes. CP12 was the form number from the CORGI era and the name stuck; the document itself is the Landlord Gas Safety Record (LGSR). Engineers, landlords and letting agents use the two names interchangeably.
Who can carry out a landlord gas safety check? +
Only an engineer on the Gas Safe Register, which replaced CORGI as the official registration scheme in Great Britain. Landlords should check the engineer's Gas Safe ID card and that they're qualified for the appliance types being checked — anyone else doing gas work is working illegally.
Do homeowners need a CP12? +
No. The annual record is a legal duty on landlords under the Gas Safety (Installation and Use) Regulations 1998 — it applies to properties let to tenants. An annual service and safety check is still sensible for any home with gas appliances, but for owner-occupiers there's no CP12 requirement.
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