title: "Gas Safety Certificate: Complete Landlord Guide" slug: gas-safety-certificate-landlord-guide description: "Everything landlords need to know about gas safety certificates (CP12), including legal requirements, annual inspections, penalties, and record keeping." category: safety keywords:
- gas safety certificate landlord
- CP12 landlord
- gas safe registered engineer
- landlord gas safety check
- gas safety regulations 1998 date: 2026-02-15 updated: 2026-03-01
What Is a Gas Safety Certificate?
A gas safety certificate, formally known as a Landlord Gas Safety Record and commonly referred to as a CP12, is the document issued by a Gas Safe registered engineer after completing an annual gas safety check on a rental property. It confirms that all gas appliances, fittings, and flues in the property have been inspected and are safe to use.
The certificate is not optional. Under the Gas Safety (Installation and Use) Regulations 1998, every landlord in England, Wales, and Scotland who lets a property with gas appliances must arrange an annual gas safety check and hold a valid CP12 certificate. Failure to comply is a criminal offence.
The Legal Requirement
The Gas Safety (Installation and Use) Regulations 1998, as amended, impose specific duties on landlords. These regulations are enforced by the Health and Safety Executive (HSE), and breaches can result in prosecution.
What the Law Requires
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Annual inspection: All gas appliances, fittings, and flues provided by the landlord must be checked for safety at intervals of no more than 12 months.
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Gas Safe registered engineer: The inspection must be carried out by an engineer who is registered on the Gas Safe Register. This is the only official registration body for gas engineers in the United Kingdom, having replaced CORGI in 2009.
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Record keeping: The landlord must keep a record of each safety check for at least two years.
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Tenant notification: A copy of the gas safety certificate must be provided to existing tenants within 28 days of the check, or to new tenants before they move in.
Which Appliances Are Covered
The annual check must cover every gas appliance and flue that the landlord owns or has provided as part of the tenancy, including:
- Gas boilers and central heating systems
- Gas cookers and hobs (if provided by the landlord)
- Gas fires and wall heaters
- Gas water heaters
- Flues and chimney systems serving gas appliances
Tenants' own gas appliances are not the landlord's responsibility, but landlords must ensure that the pipework up to the point where the tenant's appliance connects is safe.
What the Gas Safety Check Covers
A Gas Safe registered engineer conducting a landlord gas safety check will typically:
- Check gas tightness of the pipework and connections
- Test burner pressure and gas rate against manufacturer specifications
- Check ventilation to ensure adequate air supply for each appliance
- Test flue flow to confirm that combustion products are being safely removed from the property
- Check the condition of each appliance for obvious defects, damage, or signs of unsafe operation
- Test safety devices such as flame failure devices and thermocouples
- Check for carbon monoxide emissions to ensure they are within safe limits
The engineer will then issue a CP12 certificate recording the results of each test for every appliance.
Understanding the CP12 Certificate
The CP12 certificate must include:
- The date of the inspection
- The address of the property
- The name and registration number of the Gas Safe engineer
- A description of each appliance checked
- The results of the safety checks for each appliance
- Any defects identified
- Whether each appliance is classified as safe to use, at risk, or immediately dangerous
If an appliance is classified as immediately dangerous (ID), the engineer must disconnect it and attach a warning label. If it is classified as at risk (AR), the engineer will advise that the appliance should not be used until it is repaired, though the tenant can choose to continue using it at their own risk (the engineer will label it accordingly).
Providing the Certificate to Tenants
Existing Tenants
You must provide a copy of the gas safety certificate to each existing tenant within 28 days of the inspection being completed. This must be a physical or digital copy of the actual CP12 record, not just a verbal confirmation that the check has been done.
New Tenants
Before a new tenant moves in, you must provide them with a copy of the most recent gas safety certificate. This must happen before the tenancy begins, ideally as part of the sign-up documentation alongside the tenancy agreement, deposit protection information, EPC, and How to Rent guide.
How to Prove Delivery
This is where many landlords fall down. You may have arranged the inspection, received the CP12, and even sent it to the tenant, but if you cannot prove the tenant received it, you have a compliance gap.
Sending the certificate through a recorded communication platform like Togal provides timestamped proof that the document was delivered, when it was sent, and that it is available in the communication record. This is significantly more reliable than claiming you handed it over or sent it by post.
Timing and the 12-Month Cycle
Standard Annual Check
Gas safety checks must be carried out within 12 months of the previous check. If the previous check was on 15 March 2025, the next check must be completed by 14 March 2026.
Early Check Without Losing Time
A useful provision allows landlords to arrange the check up to two months before the expiry date without losing the anniversary date. This means if your certificate expires on 15 March, you can have the check done any time from 15 January onwards, and the new certificate will still be dated as valid until 15 March the following year. This gives landlords a two-month window to arrange the inspection without the stress of last-minute bookings.
When the Property Is Between Tenancies
Even if a property is vacant, it is good practice to maintain the annual gas safety check cycle. More importantly, a valid CP12 must be in place before a new tenant moves in. Letting a property without a current gas safety certificate is a criminal offence and also prevents you from serving a valid Section 21 notice (while Section 21 remains in effect during the transition period).
What Happens If the Tenant Refuses Access
This is one of the most common challenges landlords face. Tenants have a right to quiet enjoyment of their home, but landlords have a legal obligation to carry out the annual gas safety check.
Steps to Take
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Write to the tenant explaining the legal requirement and why the inspection is necessary for their safety. Give reasonable notice, at least 24 hours, and ideally offer multiple appointment times.
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Follow up in writing if the tenant does not respond or refuses. Keeping a clear written trail is essential.
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Make at least three documented attempts to arrange access. Record the dates, times, and method of each attempt.
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Consider involving the gas supplier. In extreme cases, the gas supplier can disconnect the supply if there is a safety concern.
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Seek legal advice if the tenant continues to refuse. You may be able to apply for a court order to gain access.
The critical point is documentation. If the HSE investigates and finds that you do not have a valid CP12, your defence will depend entirely on being able to prove that you made genuine, repeated, documented attempts to arrange the inspection and that the tenant refused. Using Togal to send these access requests creates an unalterable record of your attempts, including the dates and the tenant's responses or lack thereof.
Documenting Access Attempts Checklist
- First written request sent with at least 24 hours' notice, offering two or more appointment options
- Second written request sent if no response within 7 days, reiterating the legal requirement
- Third written request sent via recorded delivery or tracked digital communication
- Each request references the Gas Safety (Installation and Use) Regulations 1998
- All tenant responses (or non-responses) are recorded with dates
- If access is granted but appointment missed by tenant, this is documented
- Final letter warning that gas supply may need to be disconnected if access is not provided
Penalties for Non-Compliance
Failure to comply with the Gas Safety (Installation and Use) Regulations 1998 is a criminal offence. The consequences can be severe:
- Unlimited fines in a Magistrates' Court (fines for health and safety offences have been unlimited since 12 March 2015 under the Legal Aid, Sentencing and Punishment of Offenders Act 2012)
- Unlimited fines in a Crown Court
- Imprisonment for up to six months (Magistrates' Court) or up to two years in the Crown Court for the most serious breaches
- Invalidation of Section 21 notices: A landlord who has not provided a valid gas safety certificate cannot serve a valid Section 21 notice to end the tenancy
- Civil liability: If a tenant is injured or becomes ill due to a gas safety issue, the landlord faces personal injury claims
- Insurance implications: Many landlord insurance policies require a valid CP12. Without one, the insurer may refuse to pay a claim
HSE Enforcement
The Health and Safety Executive can prosecute landlords directly. They also work with local authority housing teams, who may identify gas safety failures during property inspections triggered by tenant complaints.
Record Keeping Requirements
The regulations require landlords to keep gas safety records for a minimum of two years. However, best practice is to keep them for at least six years, matching the limitation period for most civil claims, and ideally for the entire duration of ownership.
What to Keep
- The CP12 certificate itself (the original or a clear copy)
- Proof of delivery to the tenant, with the date
- Any correspondence regarding access arrangements
- Invoices or receipts from the Gas Safe engineer
- Records of any remedial work carried out following the check
Choosing a Gas Safe Engineer
Verifying Registration
Always verify that your engineer is on the Gas Safe Register before allowing them to work on your property. You can check this at the official Gas Safe Register website or by calling their helpline. Each Gas Safe engineer carries an ID card showing their registration number, photo, and the types of gas work they are qualified to perform.
Types of Qualification
Not all Gas Safe engineers are qualified for all types of work. Their registration specifies which categories of gas appliances they can work on. When booking a landlord gas safety check, confirm that the engineer is qualified for:
- Domestic gas work (CCN1 or CPA1 depending on the type of appliance)
- The specific appliance types in your property (e.g., boilers, cookers, fires)
Gas Safety and Other Compliance Requirements
Gas safety is one of several mandatory safety checks that landlords must maintain. For a complete compliance picture, landlords should also be familiar with:
- EICR electrical safety requirements (5-yearly electrical inspections)
- Fire safety regulations (smoke and carbon monoxide alarms)
- EPC regulations (energy performance certificates)
- Awaab's Law response deadlines (hazard reporting timelines)
Gas Safety Compliance Checklist
- Gas safety check arranged within 12 months of the previous check
- Check carried out by a Gas Safe registered engineer (registration verified)
- CP12 certificate received and reviewed for any identified issues
- Any defects identified in the check remedied promptly
- Copy of CP12 provided to existing tenants within 28 days
- Copy of CP12 provided to new tenants before tenancy starts
- Proof of delivery to tenant retained (timestamped communication record)
- CP12 and all related records stored securely for at least two years (six years recommended)
- Reminder set for next year's inspection
- Engineer's Gas Safe registration number recorded for your files
Summary
The gas safety certificate is one of the most fundamental legal requirements for landlords. The annual inspection must be carried out by a Gas Safe registered engineer, the CP12 certificate must be provided to tenants within the prescribed timescales, and records must be kept for at least two years. The penalties for non-compliance, including unlimited fines, imprisonment of up to two years, and invalidation of possession proceedings, make this an area where no landlord can afford to cut corners.
Treat the annual gas safety check not as an administrative burden but as a critical safety measure that protects your tenants, your property, and yourself from serious harm and liability.