A CP12 (Landlord Gas Safety Record) is a legal requirement for all UK landlords who provide gas appliances in rented property. It must be renewed every 12 months by a Gas Safe registered engineer. Penalties for non-compliance include unlimited fines and up to 6 months' imprisonment. You must provide a copy to existing tenants within 28 days of inspection, and to new tenants before they move in.
What Is a CP12 Certificate?
A CP12 — formally called a Gas Safety Record or Landlord Gas Safety Certificate — is the official document issued after a Gas Safe registered engineer has inspected all gas appliances, pipework, and flues in a rented property. It is a legal requirement under the Gas Safety (Installation and Use) Regulations 1998 for all landlords who rent residential or commercial property containing gas appliances.
The Health and Safety Executive (HSE) enforces these regulations and prosecutes non-compliant landlords. According to HSE data, carbon monoxide poisoning from faulty gas appliances injures thousands and kills approximately 60 people in the UK every year — the regulations exist to prevent these deaths.
Who Needs a CP12?
You need an annual CP12 if you let property containing:
- A gas boiler (combi, system, or regular)
- A gas hob or gas oven
- A gas fire or gas room heater
- Any other gas appliance provided as part of the tenancy
Gas appliances owned by the tenant themselves are not your responsibility for CP12 purposes — but the gas pipework supplying the property is, regardless of what appliances are connected to it.
What Does the CP12 Inspection Cover?
A Gas Safe engineer inspects and records the following during a CP12:
- All landlord-provided gas appliances (boiler, hob, fire, oven)
- All visible gas pipework and connections throughout the property
- Flues and ventilation performance — checking for blockages and adequate air supply
- Gas tightness test on the pipework (checking for leaks)
- Gas pressure and flow rate — confirming adequate supply to appliances
- Emergency Control Valve (ECV) at the gas meter — function check
- Carbon monoxide alarm presence and test (required in rooms with a gas boiler or fire in England since October 2022)
What Happens If an Appliance Fails the Inspection?
If an appliance is found to be "Immediately Dangerous" (ID) — a category that includes a risk of CO poisoning, explosion, or fire — the Gas Safe engineer is legally required to advise you to take it out of service immediately. If it is "At Risk" (AR) — functioning but in a condition that could become dangerous — they will advise urgent repair.
A CP12 that lists an Immediately Dangerous appliance still in use means you are renting out a property that fails your gas safety obligations. Insurers may refuse liability claims, and the HSE can prosecute.
The Legal Deadlines — No Grace Period
A CP12 must be renewed every 12 months. There is no grace period in law — a certificate expired by even one day means you are in breach. However, you can book the inspection up to 2 months early without losing the original expiry date for renewal purposes.
Penalties for non-compliance:
- An unlimited fine
- Up to 6 months' imprisonment
- Civil liability if a tenant is injured or killed due to an uninspected appliance
- Potential invalidation of landlord insurance
Your Obligations to Tenants
- Provide a copy of the current CP12 to existing tenants within 28 days of the inspection
- Provide a copy to new tenants before they move in (since 1 October 2021 in England)
- Keep copies of all gas safety records for at least 2 years
Managing Multiple Properties
For landlords with portfolios of three or more properties, tracking renewal dates across different tenancies is the biggest practical challenge. We offer portfolio landlord accounts with annual renewal reminders, multi-property discounts, and direct liaison with your tenants to arrange access — so you don't need to manage the scheduling logistics.
Gastech 24/7 Plumbing & Heating Services
Gas Safe registered engineers serving Keighley & West Yorkshire since 2012
