Gas Safety Checks: Annual Landlord CP12 Obligations, What's Inspected and Tenant Rights

Quick Answer: Under the Gas Safety (Installation and Use) Regulations 1998 (GSIUR), Regulation 36, landlords must arrange an annual gas safety check (within 12 months) on every gas appliance and flue they are responsible for, carried out by a Gas Safe registered engineer. The resulting Landlord Gas Safety Record (LGSR) — still widely called a CP12 — must be given to existing tenants within 28 days and to new tenants before they move in, and kept for 2 years. A 2018 amendment lets the check be done up to 2 months early while keeping the original anniversary date.

Summary

The annual landlord gas safety check is one of the few absolutely non-negotiable legal duties in the rented sector. It exists because faulty gas appliances kill — carbon monoxide poisoning, fires and explosions — and the law puts the duty squarely on the landlord (or their managing agent) and the work squarely with Gas Safe registered engineers. For a heating engineer, landlord checks are steady, recurring work, but they carry real responsibility: signing a CP12 is a legal record.

The form everyone calls a "CP12" is properly the Landlord Gas Safety Record (LGSR). CP12 was the CORGI form number that stuck; engineers and landlords still use the name. It records each appliance checked, the safety results, any defects, and whether the installation is safe to use. It is not a service — a safety check confirms the appliance is safe; a full service (cleaning, component checks) is a separate, more thorough job, though the two are often done together.

The duties around the record matter as much as the check itself. The landlord must give a copy to existing tenants within 28 days of the check, give it to new tenants before they move in, and keep records for two years. Since a 2018 amendment, the check can be carried out in the two months before the due date without losing the original deadline date — an MOT-style rolling system that stops the annual date drifting later each year. Tenants, for their part, must allow reasonable access, and have the right to a safe installation and a copy of the record.

Key Facts

• Legal basis — Gas Safety (Installation and Use) Regulations 1998 (GSIUR); landlord duties in Regulation 36.
• Frequency — at least every 12 months for each relevant gas appliance and flue the landlord is responsible for.
• Who can do it — only a Gas Safe registered engineer with the correct appliance categories on their registration.
• The record (CP12 / LGSR) — Landlord Gas Safety Record listing appliances, checks, defects and overall safety.
• Give to tenants — copy to existing tenants within 28 days of the check; to new tenants before they occupy.
• Keep records — retain copies for at least 2 years.
• 2018 amendment (MOT-style) — the check can be done up to 2 months before the deadline while keeping the same anniversary date, so dates don't slip.
• Scope — the landlord's appliances and flues; not the tenant's own gas appliances (though connected pipework/flue may still be the landlord's responsibility).
• Access — landlord must give tenants reasonable notice (commonly 24 hours) to gain access; tenants must allow reasonable access. If a tenant refuses, the landlord must show it took all reasonable steps.
• Check vs service — a safety check is not the same as a full service; servicing is recommended per manufacturer instructions in addition.
• CO/smoke alarms — separate but linked: the Smoke and Carbon Monoxide Alarm (England) Regulations 2015 (as amended 2022) require a CO alarm in any room with a fixed combustion appliance (excluding gas cookers).
• Penalties — HSE enforcement; unlimited fines and, in serious cases, imprisonment.

Quick Reference Table

Detailed Guidance

What the engineer actually checks

A landlord gas safety check on each appliance and its flue covers, as a minimum:

• Correct combustion — the appliance is burning correctly; on room-sealed/fan-flued appliances, a flue gas analysis (CO/CO₂ ratio) where appropriate.
• Gas tightness — the installation is sound and there are no leaks (tightness test as needed).
• Standing and working pressure — gas pressure/heat input within manufacturer limits.
• Flue/chimney — the products of combustion are being safely removed (flue flow and spillage checks).
• Ventilation — adequate air supply for safe operation.
• Safety devices — flame supervision and other safety controls operate correctly.
• Stability and connection — appliance is correctly fitted, stable and connected.

Each appliance is then classified as safe, or with a defect (e.g. At Risk or Immediately Dangerous), and the record signed.

The CP12 / LGSR record

What the LGSR (CP12) records
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- Property address and landlord/agent details
- Each appliance: location, type, make/model
- Inspection results per appliance:
    operating pressure / heat input
    safety device operation
    ventilation provision
    flue performance / spillage
    combustion (CO/CO2) where applicable
- Defects identified and action taken
- Whether the appliance is safe to use
- Gas Safe registered engineer name, licence number, signature
- Date of check and next due date

The engineer keeps a copy, the landlord keeps a copy (2 years minimum), and the tenant receives a copy.

Landlord responsibilities and timing

• Arrange the check every 12 months for all relevant appliances/flues.
• Use the 2-month early window sensibly: doing the check, say, six weeks early keeps the same anniversary date, so the deadline never drifts later.
• Distribute the record: within 28 days to existing tenants; before move-in to new tenants. For very short lets, displaying it can satisfy the duty.
• Maintain access: give reasonable notice; if a tenant repeatedly refuses, document every attempt — the landlord must demonstrate it took all reasonable steps.
• Don't confuse check with service: arrange servicing per manufacturer instructions in addition to the safety check.

Tenant rights and duties

• Right to a safe installation and to a copy of the gas safety record.
• Right to report suspected unsafe or unregistered gas work to Gas Safe Register / HSE.
• Duty to allow reasonable access for the check and any remedial work.
• Right to challenge an obviously overdue check — an out-of-date record is a red flag a tenant can act on.

Where it overlaps with other certificates

The gas safety check sits alongside other rented-property compliance: the EICR (electrical), EPC (energy), and smoke/CO alarm duties. Bundling the gas check with CO-alarm verification is good practice, since a fixed combustion appliance is exactly where a CO alarm is required.

Frequently Asked Questions

Is a CP12 the same as a gas safety certificate?

Effectively yes in everyday use — "CP12", "gas safety certificate", and "Landlord Gas Safety Record (LGSR)" all refer to the document recording the annual landlord gas safety check. "CP12" is the old CORGI form number that stuck; the legally correct term is the Gas Safety Record under GSIUR Regulation 36. It is not, however, the same as a full service record.

How often does a landlord need a gas safety check?

At least once every 12 months for each gas appliance and flue the landlord is responsible for. Thanks to the 2018 amendment you can carry out the check up to two months before the due date and keep the same anniversary date, which prevents the deadline creeping later year on year. Miss the 12-month window and the landlord is in breach.

Does the tenant's own gas cooker need checking?

The landlord's duty covers the appliances and flues the landlord provides and is responsible for. A cooker the tenant owns is generally the tenant's responsibility — but the connection, the flexible hose's safe installation, and shared flue/pipework may still fall to the landlord. In practice many engineers will note a tenant's appliance and flag obvious dangers; clarify responsibility on the record.

What happens if a tenant won't let the engineer in?

The landlord must take all reasonable steps to comply, which means giving proper notice, attempting access multiple times, and documenting every attempt (letters, texts, logged visits). The duty is to try diligently, not to force entry. If access is genuinely refused, keep the evidence — it is the landlord's defence. Lease terms usually oblige the tenant to allow access for safety work.

Is a safety check the same as a service?

No. A safety check confirms the appliance is currently safe to use — combustion, pressure, flue, ventilation and safety devices. A service is a deeper maintenance job (cleaning, component inspection, replacing worn parts) carried out to the manufacturer's instructions. The law requires the annual safety check; servicing is strongly recommended in addition and the two are often done in the same visit.

Regulations & Standards

• Gas Safety (Installation and Use) Regulations 1998 (GSIUR) — especially Regulation 36 (landlords' duties) and Regulation 39 (record keeping).

• Gas Safe Register — the official registration body for gas engineers in Great Britain.

• Smoke and Carbon Monoxide Alarm (England) Regulations 2015 (amended 2022) — CO alarm requirements in rooms with fixed combustion appliances.

• Health and Safety at Work etc. Act 1974 — overarching duty under which GSIUR sits.

• BS 6798 / BS 5440 — installation and flueing/ventilation standards referenced during checks.

• HSE — Landlords: gas safety — official duties and timing.

• Gas Safe Register — engineer registration and landlord guidance.

• GOV.UK — Smoke and carbon monoxide alarm regulations — alarm duties.

• HSE — Gas Safety (Installation and Use) Regulations 1998 — the regulations.

• landlord certificates — all the certificates a landlord needs together

• gas safe requirements — Gas Safe registration and who can do gas work

• carbon monoxide — CO dangers and alarm requirements

• unsafe situations — At Risk / Immediately Dangerous classifications

• flue gas analysis — combustion checks performed during the inspection