If you rent out a property in the UK, a gas safety certificate formally called a CP12 is not optional. It is a legal requirement under the Gas Safety (Installation and Use) Regulations 1998. Fail to have one, and you risk fines of up to £6,000 per property, invalidated landlord insurance, and in the most serious cases, criminal prosecution.
More importantly: an unchecked gas appliance is a genuine safety risk to your tenants. Carbon monoxide from a faulty boiler or gas fire is odourless, colourless, and lethal.
This guide covers everything West Yorkshire landlords need to know about the CP12, what it is, what it covers, what happens if something fails, and how to book with a Gas Safe registered engineer through MIK Plumbing.
What is a CP12 gas safety certificate?
CP12 stands for CORGI Proforma 12 a legacy reference from when CORGI was the UK gas safety body (replaced by the Gas Safe Register in 2009). The term has stuck, and it remains in common use among landlords and letting agents.
A CP12 is a record of a gas safety inspection carried out by a Gas Safe registered engineer. It confirms that all gas appliances, pipework, and flues in a rental property have been checked and are safe to use.
What does the gas safety check cover?
During the inspection, a Gas Safe engineer checks the following for each gas appliance in the property:
- Gas tightness no leaks in the gas supply or connections
- Standing and working pressure confirming the gas supply is at the correct pressure
- Burner pressure and gas rate verifying the appliance is burning gas efficiently
- Flue integrity and ventilation ensuring combustion gases are safely vented outside
- Ventilation openings checking air vents are unobstructed
- Appliance operation and safety controls testing ignition, thermostats, and safety cut-offs
- Visual condition of the appliance and pipework
A standard inspection covers boilers, gas fires, gas cookers, and any other gas appliance in the property. It does not cover the gas meter itself, which is the responsibility of your gas supplier.
What are your legal obligations as a landlord?
| Obligation | Detail |
| Annual inspection | All gas appliances must be checked every 12 months by a Gas Safe registered engineer |
| Provide certificate to tenant | A copy of the CP12 must be given to existing tenants within 28 days of the inspection, and to new tenants before they move in |
| Keep records | You must keep a copy of the CP12 for at least two years |
| Maintenance | Gas appliances must be maintained in a safe condition throughout the tenancy, not just at the point of inspection |
What happens if a property fails the gas safety check?
If an appliance is found to be unsafe, the engineer will classify it using the Gas Industry Unsafe Situations Procedure (GIUSP):
- Immediately Dangerous (ID): the appliance is turned off immediately and must not be used until repaired or replaced. The engineer will disconnect it.
- At Risk (AR): the appliance is not immediately dangerous but poses a risk if it continues to be used. The engineer will advise disconnection and recommend urgent repair.
- Not to Current Standard (NCS): the appliance does not meet current standards but is not a safety risk. Action is recommended but not urgent.
In all cases, MIK Plumbing will provide a written report detailing the fault, the risk classification, and the remedial work required. We can carry out most repairs on the same visit or schedule a follow-up promptly.
As a landlord, you cannot legally re-let a property with an Immediately Dangerous appliance. Attempting to do so could constitute a criminal offence.
What are the penalties for non-compliance?
The Health and Safety Executive (HSE) takes landlord gas safety obligations seriously. Penalties include:
- Fines of up to £6,000 per offence per property
- Up to six months in prison for criminal non-compliance
- Invalidation of landlord insurance policies most policies require a valid CP12
- Inability to serve a valid Section 21 notice courts have rejected eviction notices where no CP12 was provided to the tenant
Beyond the legal consequences, an unserviced gas appliance in a rental property is a serious moral responsibility. Carbon monoxide poisoning remains one of the leading causes of accidental death in UK homes.
How MIK Plumbing supports West Yorkshire landlords
MIK Plumbing is Gas Safe registered and carries out CP12 inspections across Bradford, Shipley, Bingley, Keighley, and the wider West Yorkshire area. We understand that landlords need their properties checked promptly, with minimal disruption to tenants, and a certificate issued the same day.
Our landlord service includes:
- Flexible scheduling including early morning or Saturday appointments where required
- Same-day CP12 certificate issued digitally
- Annual reminder service we contact you when your next inspection is due
- Boiler service combined with CP12 inspection available at a discounted rate
- Remedial repairs carried out by the same engineer where possible
For landlords with multiple properties, we offer a portfolio pricing structure contact us to discuss.
Book your CP12 with MIK Plumbing. Gas Safe registered, West Yorkshire-based, certificate issued same day. Call us or book online we cover Bradford, Shipley, Bingley, Keighley, and surrounding areas.
Frequently asked questions
A Gas Safety Certificate, commonly known as a CP12, is a legal document issued by a Gas Safe registered engineer after inspecting gas appliances, pipework, and flues in a rental property to confirm they are safe to use.
Landlords must arrange a gas safety inspection every 12 months and obtain a new CP12 certificate to remain compliant with UK gas safety regulations.
Failing to obtain a valid CP12 certificate can result in legal penalties, fines, difficulties with eviction proceedings, and increased risk to tenant safety.
