Gas safety is one of the most rigorously enforced of all landlord safety obligations. Failure to provide a valid gas safety record bars a landlord from serving a valid Section 8 notice (and previously Section 21) — meaning non-compliance directly blocks possession proceedings. A landlord who lets a property without a current gas safety check also faces criminal prosecution under the Gas Safety Regulations.
From 2018, the '12-month anniversary' rule was clarified: a landlord can have the annual check carried out up to 2 months before the anniversary date without losing the 12-month cycle. This means the same calendar month can be used every year for renewals, giving a practical 10-month window each year.
What is a gas safety certificate (CP12)?
A CP12 is the common term for the Gas Safety Record produced after an annual gas safety inspection. CP12 refers to the form number historically used by Corgi (now Gas Safe). The official document is the Landlord Gas Safety Record (LGSR). It records:
- The address of the property and each appliance inspected
- The date of inspection and the next due date
- Any defects identified and whether the appliance has been left in a safe condition
- The engineer's name, signature, and Gas Safe registration number
- Whether any appliances were condemned (immediately dangerous) or at risk
Which properties require an annual gas safety check?
The requirement applies to all domestic gas appliances and flues in a property that is let under a tenancy. This includes:
- Gas boilers and central heating systems
- Gas fires (including decorative gas fires)
- Gas cookers and hobs (where supplied by the landlord as part of the tenancy)
- Gas water heaters
- Any other gas appliance provided by the landlord
- Flues and chimneys serving any of the above
- Excluded: Appliances owned by the tenant (not provided by the landlord) — although the landlord must still ensure the connecting pipework is safe
The 28-day rule — serving the gas safety record
After each annual check, the landlord must provide a copy of the gas safety record to existing tenants within 28 days of the check. For new tenants, the record must be provided before or at the start of the tenancy.
- Provide the record directly to the tenant — email is acceptable provided the tenant has agreed to receive documents electronically
- Keep a copy of every gas safety record for at least 2 years
- At the start of a new tenancy, hand over the most recent gas safety record with the tenancy documents
- The record must be provided before the tenant moves in — it cannot be given after the tenancy commences
- For HMOs, provide the record to each household / room where the appliance serves that room
The 2-month early renewal rule
Under Regulation 36(3)(c) of the Gas Safety Regulations, a landlord can arrange a gas safety check up to 2 months before the anniversary date of the previous check, without losing the 12-month anniversary cycle. This means:
- If your current CP12 is dated 15 June 2025, you can renew as early as 15 April 2026 and the new certificate will run until 15 June 2026
- This gives a practical 10-month booking window per year
- If you renew more than 2 months early, the new 12-month cycle starts from the new inspection date, effectively shortening your annual cycle
- Do not leave renewals to the last day — engineers are booked up and a lapse in cover bars possession proceedings
Consequences of non-compliance
The consequences of failing to maintain a current gas safety record are severe and operate across three separate legal regimes:
- Criminal liability: Failure to carry out or record the annual check is a criminal offence under Regulation 36 of the Gas Safety Regulations — unlimited fine and/or up to 6 months' imprisonment
- Possession bar: Under the Renters' Rights Act 2025, a Section 8 notice served without a current gas safety record is invalid. The court will strike out the claim. This means a non-paying or problem tenant in a property with a lapsed certificate is effectively irremovable until compliance is achieved
- Insurance void: Most landlord building and contents insurance policies require gas safety compliance. A lapsed certificate may void the policy
- Licensing jeopardy: Non-compliance with gas safety can result in revocation of an HMO or selective licence
Gas safety checks and possession proceedings
The connection between gas safety compliance and possession rights is one of the most practically important in landlord law. The rule operates as follows:
- A Section 8 notice is only valid if the landlord has complied with all statutory obligations including gas safety
- If the gas safety record was not provided to the tenant at the start of the tenancy, or has since lapsed, the Section 8 notice may be invalid
- The landlord can remedy the non-compliance before serving the notice — renew the certificate, serve it on the tenant, then serve the Section 8 notice
- Best practice: check all compliance documents are current before serving any possession notice
- The same rule applied to Section 21 — courts regularly struck out Section 21 claims for missing or unserved gas safety records
Frequently asked questions
How often do I need a gas safety check as a landlord?+
Every 12 months. The annual check must be carried out by a Gas Safe registered engineer. The record produced (CP12 / LGSR) must be provided to your tenant within 28 days of the check, or before a new tenancy begins. You can renew up to 2 months early without losing the 12-month anniversary cycle.
What is a CP12 certificate?+
CP12 is the informal name for the Landlord Gas Safety Record (LGSR) — the document produced by a Gas Safe registered engineer after an annual inspection. The name comes from the historical Corgi form number. It records the appliances inspected, any defects found, and the engineer's registration details. It is not an official term but is widely used in the industry.
Can I use any gas engineer for the annual check?+
No. Only Gas Safe registered engineers are legally permitted to carry out gas safety checks on gas appliances. Always verify the engineer's Gas Safe registration on the Gas Safe Register website before they attend. An inspection carried out by an unregistered engineer is legally worthless and does not satisfy the Regulation 36 obligation.
What if my tenant refuses access for the gas safety check?+
Document all attempts to arrange access in writing. Send at least two written requests giving reasonable notice and time options. If access is refused without good reason, you may need to apply to court for an injunction to gain access. Do not force entry — this is unlawful. Keep all correspondence as evidence that you have taken all reasonable steps to comply.
Does a new boiler still need an annual check?+
Yes. There is no exemption for new appliances. The annual gas safety check requirement applies from the start of the tenancy, regardless of the age or condition of the appliance. A boiler installed the day before a tenancy begins still needs to be checked by a Gas Safe engineer and a record provided to the tenant.
Can I serve a Section 8 notice if my gas safety record has lapsed?+
Technically, the notice may be challenged and invalidated. The safest approach is to renew the gas safety check, provide the new record to the tenant, and then serve the Section 8 notice. Courts have struck out possession claims where the gas safety obligation was not complied with at the time of service. Do not serve notice until all compliance documents are current.