Landlord gas safety checks explained: what a CP12 covers

Keeping gas systems safe in a rental property is not only good practice, it is a legal obligation for landlords. Understanding what a CP12 gas safety check involves can help you stay compliant, avoid last minute panic and give both you and your tenants peace of mind.

Legal responsibilities for landlord gas safety checks

Landlords are legally required to arrange an annual gas safety check on every gas appliance and flue provided with the property. This must be carried out by a Gas Safe registered engineer and documented on a gas safety certificate, often called a CP12.

This guide is for general information only and is not legal advice. Regulations can change and individual situations differ, so always check the latest Gas Safety (Installation and Use) Regulations and, if needed, speak with a legal or compliance professional.

Letting agents managing properties on behalf of landlords usually take on the practical task of arranging checks, but the legal responsibility remains with the landlord named on the tenancy.

What a CP12 gas safety check covers

A CP12 is a formal record that a qualified engineer has checked the gas installations and found them safe to use at the time of inspection. The engineer will focus on both the operation of appliances and the safety of the gas installation as a whole.

Typically, a landlord gas safety check will include:

• All gas appliances supplied by the landlord, such as boilers, gas fires, gas hobs and ovens

• Fixed flues and chimneys serving those appliances

• Visible gas pipework and any accessible joints

• Safety devices, ventilation and combustion air supply

• Checks for gas leaks and correct gas pressure or heat input

The engineer will record the results, any defects found, and any actions needed to keep the system safe. The certificate will show the property address, appliances checked, engineer details and the date the next check is due.

What happens if an appliance fails the check

If an appliance is found unsafe, the engineer will grade the fault and act accordingly. In serious cases, this may mean immediately disconnecting the appliance from the gas supply to protect the occupants.

The CP12 will note the defect and any warning labels applied. As landlord or managing agent, you will then need to arrange repair or replacement by a Gas Safe engineer before the appliance is used again. In some situations, a follow up visit is required to confirm the fault has been rectified and to update the paperwork.

If the fault prevents the property being used safely, you will need a clear communication plan with the tenant, particularly if heating, hot water or cooking are affected.

Timelines for checks and issuing the CP12

A landlord gas safety check must be carried out at least once every 12 months. Many landlords and agents work to a shorter internal deadline to avoid last minute issues, especially in winter when engineers are busier.

Once the inspection is complete, certificates are typically issued the same day or within a couple of working days, depending on the engineer’s reporting system. Electronic CP12s are now common and are often emailed directly to both landlord and agent.

Importantly, tenants must receive a copy of the current gas safety certificate within 28 days of the check, and new tenants must be given the latest CP12 before they move in.

Record keeping, reminders and best practice

Good records make compliance far easier to manage, especially if you have multiple properties. Keep copies of all CP12 certificates for at least two years as a minimum, though many landlords store them for longer.

Best practice for staying organised includes:

• Using a central log or spreadsheet for all properties and renewal dates

• Setting calendar reminders 6 to 8 weeks before each CP12 expiry date

• Agreeing responsibilities with your letting agent in writing

• Booking preferred engineers early during busy periods, such as autumn

Some heating companies will also offer reminder services or annual plans to help you keep on top of safety deadlines.

Common misconceptions about CP12 checks

“A boiler service is the same as a CP12”

A landlord gas safety check and a boiler service are related but not identical. A CP12 is a legal safety check focusing on whether the gas appliances and flues are currently safe to use and meet regulatory standards.

A boiler service is more in depth maintenance on the boiler itself. It typically includes cleaning internal components, checking system efficiency and looking for parts that may fail in future. It is possible to have a CP12 completed without a full service, although combining the two during the same visit is often the most cost effective and practical approach.

“Tenants are responsible for arranging gas safety checks”

Gas safety checks required under landlord regulations must be arranged and paid for by the landlord, not the tenant. Tenants should never be asked to organise their own CP12 for a property they rent.

Tenants are, however, responsible for using gas appliances correctly, reporting any concerns promptly and allowing reasonable access for safety checks and repairs.

“The CP12 lasts for the boiler’s lifetime”

The CP12 only confirms that gas appliances and flues were safe at the time of the check. It does not guarantee future performance or last for the lifetime of the appliance.

You must renew the check at least every 12 months, and you may need additional visits if problems are reported or work is carried out on the gas system.

What tenants should be told about gas safety

Clear communication with tenants helps safety visits run smoothly and reduces disruption. At the start of a tenancy, provide a copy of the current CP12 and explain that annual gas safety checks are a legal requirement.

Tenants should understand the need to provide access on agreed dates, keep gas meter and appliances unobstructed, and report issues such as suspected gas smells, sooting, or yellow flames on burners. It is also sensible to confirm who they should contact in an emergency and remind them about the national gas emergency number.

How to prepare for the gas safety appointment

A few simple steps before the engineer arrives can save time and prevent missed appointments. Landlords and agents should coordinate with tenants to make sure the property and appliances are ready.

Use this quick checklist to prepare:

• Confirm the appointment date and time with the tenant and provide contact details

• Ensure someone is available to give access, or arrange key collection with the agent

• Clear access to the boiler, gas fire, hob and any other appliances

• Make sure meter cupboards and any flues or chimneys are not blocked or locked

• Have previous CP12 certificates available if possible, especially for multi‑property portfolios

Booking landlord gas safety checks and ongoing maintenance

Working with a reliable Gas Safe registered company makes staying compliant much easier. Infinity Heating Solutions And Property Maintenance Ltd can carry out landlord gas safety checks, issue CP12 certificates promptly and help you plan renewal dates across your portfolio.

For long term protection of your heating system, it is sensible to pair annual CP12 checks with regular boiler servicing for ongoing maintenance and efficiency. Ask about combining both on the same visit to minimise disruption to tenants.

To arrange a landlord gas safety check or discuss boiler servicing for your rental properties, contact Infinity Heating Solutions And Property Maintenance Ltd on 07504204223.