CP12 (Gas Safety Record)
The document issued after an annual gas safety check by a Gas Safe registered engineer, commonly called a Gas Safety Certificate. Landlords must renew it every 12 months, give the tenant a copy within 28 days of the check, and give new tenants a copy before they move in. Non-compliance is a criminal offence under the Gas Safety (Installation and Use) Regulations 1998.
At a glance
- Renewal
- Every 12 months
- Tenant copy
- Within 28 days of the check
- New tenants
- Copy before move-in
- Enforcement
- Criminal offence + unlimited fine
- Law
- Gas Safety (Installation and Use) Regulations 1998
Full guide
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Deadlines, fines and step-by-step compliance in our in-depth resource.
Open full guideWhy CP12 (Gas Safety Record) matters for landlords
The CP12 is the single piece of paper that decides whether a landlord has a legal defence after a gas incident. Because the duty is framed as a criminal offence rather than a civil penalty, prosecution can follow even where no tenant complaint was raised. The 28-day tenant-copy and pre-tenancy rules are the parts that catch landlords out most often — a valid certificate that was never given to the tenant is still a breach, and it blocks possession routes that depend on a compliant tenancy setup.
Worked example
A landlord in Leeds has a current CP12 dated 12 February 2026 covering a single-let two-bed terrace. They book the next inspection for 11 February 2027 to stay inside the 12-month window. The engineer cannot get access on the day and the inspection is rescheduled to 18 February — outside the 12 months. The landlord is now letting a property with no valid CP12 for 7 days, which is a strict-liability breach of the Gas Safety (Installation and Use) Regulations 1998, and any incident in that window is unprosecutable from the defence side. The fix is a 60 / 30 / 14 / 7-day reminder ladder so every renewal has a buffer.
Illustrative scenario based on real UK landlord casework patterns. Names and addresses are fictitious.
Common CP12 (Gas Safety Record) mistakes UK landlords make
- Letting the renewal fall on the exact 12-month anniversary instead of giving a 2-week safety buffer for access issues.
- Sending the new CP12 to the tenant by email only and not retaining proof of receipt — the 28-day tenant-copy rule requires evidence of issue.
- Forgetting that new tenants need a copy before move-in, separately from the 28-day rule for in-place tenants.
- Accepting a "CP12" from an unregistered handyman — only Gas Safe registered engineers can produce a valid record, and the landlord is criminally liable either way.
What to do this week
- Diary every CP12 renewal at the 60 / 30 / 14 / 7-day mark, not on the day-of-expiry.
- Create a single shared folder per property containing every CP12 since the property was first let.
- Issue every new CP12 with a single dated email to the tenant and BCC yourself for proof of service.
- Verify your engineer at gassaferegister.co.uk before booking — a 30-second check protects a £6,000+ prosecution defence.
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Official sources
LetCompliance editorial reviews this entry every quarter against the sources above. Always confirm specific duties with a qualified solicitor or your local council.
Related terms
Move-in Pack (Statutory)
The bundle of documents an English landlord must serve on a new tenant before — or at the very start of — a tenancy. Standard contents: latest Gas Safety Certificate (CP12), latest EICR, current EPC (band E or above), Deposit Prescribed Information, the latest GOV.UK How to Rent guide, and (from 1 May 2026) the Renters’ Rights Act 2025 Information Sheet. Failure to serve any required item invalidates a future Section 21 notice and weakens Section 8 ground 1 / 1A defences.
Gas Safe Register
The official register of gas engineers qualified to work safely and legally on gas appliances in the UK. Only Gas Safe registered engineers can carry out the annual gas safety check required for rental properties. Verify an engineer's registration at gassaferegister.co.uk before any work starts.
Capital Gains Tax (CGT)
Tax on the profit from selling a rental property. From April 2024 the CGT annual exempt amount was reduced to £3,000 and residential property gains are taxed at 18% (basic rate) or 24% (higher rate). A CGT return must be filed and tax paid within 60 days of completion.
Check-in / Check-out Report
The dated, photographed inventory record taken at the start (check-in) and end (check-out) of a tenancy, signed by tenant and landlord/agent. It is the primary evidence base for any deposit deduction claim through the DPS, TDS or mydeposits adjudication process — without it, the scheme will almost always award the deposit back to the tenant. Best practice: third-party inventory clerk, time-stamped photographs of every room and meter reading, and tenant sign-off within 7 days.
Civil Penalty Notice
A financial penalty up to £30,000 a local housing authority can impose as an alternative to criminal prosecution under the Housing and Planning Act 2016, the Housing Act 2004 (HMO offences) and various tenancy offences. Common triggers: failure to comply with an Improvement Notice, breach of HMO licensing, unlawful eviction, breach of selective licensing or letting an unsafe property. The landlord can appeal to the First-tier Tribunal within 28 days; unpaid penalties are recoverable in the County Court.
CO Alarm (Carbon Monoxide Alarm)
Required from 1 October 2022 in every room with a fixed combustion appliance (excluding gas cookers) in private rented homes in England. The landlord must ensure an alarm is present and in working order at the start of each tenancy. Maximum civil penalty: £5,000 per property.