CP12 Certificate vs Service Record Explained

A boiler can have a recent service record and still need a landlord gas safety check. Equally, a valid CP12 does not mean the boiler has received the full manufacturer-recommended service. Understanding the difference between a CP12 certificate vs service record helps landlords avoid compliance gaps and helps homeowners book the right work first time.

The short answer is simple. A CP12 records a gas safety inspection for a rented property. A service record shows that an appliance, most commonly a boiler, has been serviced or maintained. They can be completed during the same appointment, but they are not the same document and should not be treated as substitutes.

CP12 certificate vs service record: the key difference

A CP12 certificate is the common name for a Landlord Gas Safety Record. It is a legal compliance document for rented homes with gas appliances, pipework, flues or related gas installations. A Gas Safe registered engineer carries out the inspection and records whether the relevant equipment is safe to use at the time of the check.

A service record is a maintenance document. It confirms that an engineer has serviced an appliance, carried out work, and recorded the findings. This may be an entry in the boiler's service book, a digital record, an invoice or a manufacturer-specific checklist.

The distinction matters because the purpose is different. A CP12 is about legal gas safety in a rental property. A boiler service is about maintenance, performance, reliability and, in many cases, meeting the terms of a manufacturer's warranty.

What a CP12 certificate covers

For landlords, an annual gas safety check is a legal duty where gas appliances are supplied in the property. The inspection must be completed by a suitably qualified Gas Safe registered engineer. The resulting record should identify the appliances checked, the engineer, the inspection date, the results and any defects or action required.

During a gas safety check, the engineer will assess the gas installation and appliances for safe operation. This commonly includes checking:

• gas tightness and accessible pipework

• appliance operation and combustion safety

• adequate ventilation and flue performance

• whether safety devices and controls are working correctly

The engineer will also look for signs of unsafe conditions, such as a damaged flue, poor ventilation, gas leaks or unsafe combustion. If an appliance is found to be unsafe, it may need to be turned off, labelled or disconnected until repairs are completed. Safety comes before certification.

A CP12 is normally required every 12 months. Landlords must provide a copy to existing tenants within 28 days of the check and give new tenants a copy before they move in. Records must also be kept for at least two years.

Letting agents can arrange appointments on a landlord's behalf, but the legal responsibility remains with the landlord. At a busy changeover, this is one of the easiest jobs to leave too late. Booking ahead prevents a lapse in cover and avoids holding up a new tenancy.

What a CP12 does not prove

A CP12 does not automatically confirm that a boiler has been fully serviced. It is possible for a boiler to pass a safety inspection while still needing maintenance due to age, wear, reduced efficiency or manufacturer service requirements.

It also does not replace other property compliance duties. Electrical checks, smoke alarms, carbon monoxide alarm requirements and wider property maintenance need to be managed separately.

What a service record covers

A boiler service is a more detailed maintenance visit focused on the appliance itself. The exact work depends on the boiler model, its condition, age and the manufacturer's instructions. An engineer may inspect and clean components, check pressure and performance, assess seals and condensate arrangements, test combustion readings, and identify parts that need attention.

The service record documents what was done and what was found. It gives the owner a useful maintenance history, particularly if the boiler develops a fault, is still under warranty or is being sold with the property.

For a homeowner living in their own property, there is no general legal requirement to hold a CP12 certificate. Regular boiler servicing is still a sensible precaution. It can reduce the chance of inconvenient breakdowns, help spot developing faults and may be required to preserve a manufacturer's warranty.

For landlords, a boiler service is not automatically a legal replacement for a gas safety record, even if the service is thorough. If the property needs a CP12, the correct Landlord Gas Safety Record must be issued.

A service record is not always boiler-only

Although people usually mean a boiler service record, other gas appliances can also be serviced. A gas fire, gas hob or cooker may need maintenance where the appliance condition, usage or manufacturer guidance calls for it. Ask the engineer to confirm exactly which appliances are included before the visit.

Can the two be done at the same appointment?

Yes. In many rental properties, arranging a gas safety check and boiler service together is the practical option. It reduces tenant disruption, gives the engineer a fuller picture of the heating system and leaves the landlord with the right paperwork for both compliance and maintenance.

However, ask for both documents. You should receive a Landlord Gas Safety Record for the CP12 inspection and a separate service record or invoice confirming the boiler service work. One document should not be assumed to cover both jobs unless it clearly states that it does and includes the relevant findings.

Combining visits is especially useful before winter, at the start of a tenancy or when a property has been vacant. A boiler that has sat unused for months may need more than a quick safety check before tenants rely on it for heating and hot water.

Which document do you need?

The answer depends on your role and the property. A landlord with gas appliances in a rented house or flat needs a valid CP12 every year. If the property has a boiler, a regular service is also strongly advisable and may be needed for warranty protection.

A homeowner normally needs a service record rather than a CP12. If you are selling a home, a documented service history can reassure prospective buyers, but it is not the same as a landlord certificate.

A managing agent should keep copies of both where both have been completed. The CP12 supports the landlord's statutory safety obligations, while service records help with planned maintenance, repair decisions and warranty claims.

If the property has no gas appliances, no gas meter and no gas pipework, a CP12 is unlikely to be relevant. Do not assume this is the case simply because the heating is electric. Some homes have a capped gas supply, a gas hob or other retained gas installations that still need proper consideration.

Common paperwork mistakes to avoid

The most common mistake is filing a boiler service invoice as though it were a CP12. An invoice may say the boiler was serviced, but it may not contain the full information required for a Landlord Gas Safety Record.

Another issue is booking an engineer without confirming that they are Gas Safe registered and qualified for the appliances involved. Always check that the work and certification match the engineer's registered competence.

Timing also causes problems. A landlord may book the annual check close to expiry, only to find that tenant access is unavailable or repairs are required before a certificate can be issued. Arrange the appointment early enough to deal with any faults properly.

Finally, do not rely on verbal confirmation. Keep readable copies of certificates, service records and repair invoices together. Digital copies are practical, but make sure you can retrieve them quickly if a tenant, agent, insurer or warranty provider asks for them.

Book the right gas work first time

If you need legal rental compliance, ask for a CP12 or Landlord Gas Safety Record. If you need appliance maintenance, ask for a boiler service and service record. If you need both, say so when booking.

For landlords and homeowners in Bournemouth, Poole and Christchurch, Bournemouth Gas Certificates can arrange gas safety checks and related boiler servicing with clear, practical paperwork. A same-day certificate is useful when the inspection passes, but any safety issue should always be repaired properly rather than rushed.

Keep the next CP12 date and boiler service date in your diary as separate reminders. That small step makes it far easier to protect your tenants, maintain your heating and stay ready when paperwork is needed.