Gas Safety Certificates for Landlords: Annual Requirements and Penalties

The Legal Requirement

Under the Gas Safety (Installation and Use) Regulations 1998, every landlord who lets a property with gas appliances must have an annual gas safety check carried out by a Gas Safe registered engineer. This is not optional — it is a criminal offence to let a property without a valid Gas Safety Certificate (also called a CP12 or Landlord Gas Safety Record).

The check must be completed within 12 months of the previous one. You can have it done up to 2 months early without losing your anniversary date, which gives you a useful window for scheduling.

What the Inspection Covers

A Gas Safe engineer will inspect and test:

• All gas appliances — boilers, fires, cookers, and water heaters
• Flues and ventilation — ensuring exhaust gases are safely removed
• Pipework — checking for leaks and corrosion
• Safety devices — confirming flame failure devices and thermocouples work correctly
• Gas pressure — verifying it falls within safe operating range

The engineer will record the results on the official Landlord Gas Safety Record form, noting any defects found and whether each appliance is safe to use.

Serving the Certificate to Tenants

You must provide a copy of the Gas Safety Certificate to:

• Existing tenants — within 28 days of the check being completed
• New tenants — before they move in

Keep proof that you served the certificate. A signed acknowledgement, email with attachment, or recorded delivery all work. If a dispute arises, you need to show that the tenant received it.

This is part of the broader set of compliance documents required under the RRA 2025 — see our tenant rights guide for the complete list.

Penalties for Non-Compliance

The Health and Safety Executive (HSE) enforces gas safety regulations. Penalties are severe:

• Unlimited fine on conviction
• Up to 6 months imprisonment (or longer in serious cases)
• Invalidation of insurance — your landlord insurance may refuse to pay claims
• Section 21 implications — under pre-RRA rules, a valid Gas Safety Certificate was required before serving a Section 21 notice. Under the RRA 2025, while Section 21 is abolished, gas safety remains a compliance requirement that can affect possession proceedings

A landlord in Manchester was fined over £30,000 in 2023 for failing to carry out gas safety checks across multiple properties. Courts take these cases seriously.

Who Can Carry Out the Check?

Only a Gas Safe registered engineer can perform a landlord gas safety check. You can verify an engineer's registration at GasSafeRegister.co.uk. Every registered engineer carries an ID card with a unique licence number and a list of the gas work they are qualified to do.

Never accept a certificate from someone who is not Gas Safe registered — it will not be legally valid.

What It Typically Costs

Costs vary by region. Some engineers offer a combined gas safety check and boiler service at a reduced rate, which can be worth doing to keep the boiler in good condition.

Keeping Records

You must keep gas safety records for at least 2 years. Best practice is to keep them for as long as you own the property. Store:

• The original Landlord Gas Safety Record (CP12)
• Proof of service to the tenant
• The engineer's Gas Safe registration number
• Any remedial work reports

Property management platforms like Get Let Flow store your certificates digitally and send automatic reminders before the annual renewal is due, so nothing slips through the cracks.

Checklist for Annual Gas Safety

• Book the check within the 2-month early window to keep your anniversary date
• Verify the engineer is Gas Safe registered before they arrive
• Ensure the engineer can access all gas appliances (inform tenants in advance)
• Receive the completed CP12 form and check it for any defects noted
• Serve a copy to the tenant within 28 days (or before move-in for new tenants)
• Store the certificate and proof of service securely
• Set a reminder for next year's renewal