A CP12 is not paperwork to leave until the last minute. If you let property in Leeds, Birstall, Batley or the wider West Yorkshire area, knowing how long does a CP12 last helps you protect your tenants, stay on the right side of your legal duties and avoid an urgent booking when a tenancy is due to start.
A CP12, more formally called a Landlord Gas Safety Record, lasts for 12 months from the date of the gas safety check. It must be renewed every year by a Gas Safe registered engineer where there are relevant gas appliances, flues or installation pipework in a rented property.
How long does a CP12 last in practice?
The straightforward answer is one year. The date shown on the current certificate is the date to work from, rather than the date you happen to file the document or give a copy to the tenant.
For example, if a gas safety inspection is completed on 15 September 2026, the next check should be completed by 14 September 2027. Once that date passes, the existing CP12 is no longer current. You should not rely on a booking confirmation or a previous certificate as proof that the property has a valid annual check.
A CP12 does not automatically cover you for several years simply because the boiler is relatively new or was serviced recently. A modern boiler still needs an annual gas safety check in a rented home. Equally, an old certificate does not become valid again because an appliance has been repaired after the expiry date.
You can renew a CP12 early without losing the date
Landlords do not need to wait for the exact expiry date. In fact, arranging the inspection before the deadline is usually the safer option, especially around busy periods, tenant changeovers or when access needs coordinating.
Under the current rules, you can have the new check carried out between 10 and 12 months after the previous check and keep the same annual renewal date. This gives you a two-month window to plan ahead without bringing the renewal date forward each year.
For instance, if the last check was completed on 15 September, you could arrange the next one from 15 July onwards. Provided it is completed before the 12-month deadline, the next due date can remain 15 September the following year.
If you renew much earlier than that two-month window, the new CP12 runs for 12 months from the new inspection date. There is nothing wrong with doing this where it suits a new tenancy or maintenance programme, but it may mean you gradually bring the annual due date forward.
What does a CP12 check cover?
A CP12 is a safety inspection, not simply a boiler service. The engineer checks the gas appliances and related installation elements that the landlord provides, making sure they are safe to use at the time of the visit.
The exact scope depends on the property, but it commonly includes the boiler, gas fire, cooker or hob supplied by the landlord, as well as relevant flues and gas pipework. The engineer will check matters such as gas tightness, burner pressure or gas rate where appropriate, ventilation, flue performance and whether safety devices are operating correctly.
A boiler service is more focused on the appliance’s condition, maintenance and performance. In many rental properties, it makes practical sense to have the boiler serviced and the annual gas safety check completed at the same appointment. However, they remain different jobs. Ask the engineer what is included so you receive the right work and the right documentation.
When a CP12 may no longer be enough
The certificate lasts 12 months, but it is not a promise that every appliance will remain safe for the whole year without attention. If a tenant reports a smell of gas, repeated boiler lockouts, black marks around an appliance, headaches when the heating is on, or a carbon monoxide alarm sounding, treat it as an immediate safety concern.
Do not wait for the next annual inspection. Turn off the appliance if it is safe to do so, ventilate the property where possible, and arrange urgent professional advice. Where there is a suspected gas escape, the emergency gas service should be contacted straight away.
A CP12 may also need replacing if the inspection identifies defects that must be rectified before the appliance can be used safely. An engineer may label an appliance as At Risk or Immediately Dangerous, depending on the fault found. In some cases, the appliance will need to be disconnected from the gas supply until repairs are completed.
After remedial work, obtain clear paperwork confirming what was repaired and whether the appliance has been retested. If the previous record no longer accurately reflects the installation or appliances in the property, a new gas safety record is the clearest way to demonstrate compliance.
Your responsibilities as a landlord
Landlords are responsible for arranging annual safety checks for gas appliances, flues and installation pipework they provide. The work must be completed by an appropriately qualified Gas Safe registered engineer.
You must provide a copy of the current record to an existing tenant within 28 days of the check. New tenants must receive a copy before they move in. You should also keep your gas safety records for at least two years, even after a newer certificate has been issued.
Where a tenant owns their own gas cooker or other gas appliance, that appliance is normally their responsibility. The position can be more detailed where landlord-owned pipework, a flue or a shared system is involved, so do not make assumptions. A competent engineer can explain what should be inspected at your property.
If the property is empty, the annual requirement does not disappear. The check must still be up to date before a new tenant moves in. This is particularly relevant for landlords arranging repairs, decorating and viewings between tenancies. Booking the CP12 early gives time to deal with any issues before a move-in date is at risk.
What if the tenant will not give access?
You still have a duty to take reasonable steps to have the annual check completed. Start contacting the tenant well before the due date and offer practical appointment options. Keep written records of calls, texts, emails, letters and any attempted visits.
A tenant cannot simply remove your responsibility by declining access, but you should not force entry unless you have a lawful right and have taken proper advice. Good communication is usually the best first step. Explain that the visit is a legal safety inspection, give clear notice and make the appointment as convenient as possible.
For managed properties, make sure the managing agent knows the CP12 renewal date and who is responsible for arranging access. Missed renewals often happen because everyone assumes somebody else has booked the engineer.
Avoid the common renewal-day problems
The simplest way to stay compliant is to record the due date as soon as the CP12 is issued and set reminders well before the two-month early-renewal window opens. Keep a copy of the record in a secure property file, alongside boiler service reports and repair paperwork.
Before the appointment, ask the tenant to ensure the boiler and any landlord-provided gas appliances are accessible. Cupboards should be cleared where possible, and there should be safe access to the boiler, meters and relevant flue routes. If the engineer cannot inspect an appliance properly, the visit may need to be rearranged.
Choose an engineer who explains any findings in plain English and provides the paperwork promptly. This matters when you are managing several properties or working to a tight tenancy deadline. A clear record helps tenants understand the safety checks completed and gives you evidence that your responsibilities have been addressed.
For landlords who need an annual inspection, boiler service or repairs following a failed check, Tante Plumbing & Heating provides Gas Safe gas work with straightforward quotations and clear documentation. Booking before the deadline leaves room to resolve faults properly, rather than rushing a decision on the day a tenant is due to collect the keys.
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