12 months
Maximum interval between CP12 inspections
28 days
Deadline to give tenants the certificate
2 years
Minimum record retention
Unlimited
Maximum fine for non-compliance
Source: Gas Safety (Installation and Use) Regulations 1998, Reg 36 · HSE landlord guidance, May 2026.
Landlord gas safety is one of the few areas of UK property law where the rules are short, clear and strictly enforced. The good news: there are only four things you have to get right. The bad news: ignoring any of them is a criminal offence, not a civil one.
Annual check. Gas Safe engineer. Two years of records. Twenty-eight days to the tenant. That is the entire core duty. Most landlord disputes, and almost all prosecutions, come from sliding on one of those four numbers, not from anything exotic.
Boiler cover comes into the picture because a good landlord plan can bundle the annual CP12 into a monthly cost, fold in repair callouts, and remove most of the admin overhead. But the cheapest plan is not always the right one, and a homeowner plan is never a substitute. This guide explains what the law actually says, which cover tier matches which situation, and how to use the calculator to find your renewal date.
Is your rental property legally compliant?
Enter the date of the last gas safety check. We work out your renewal window, your legal status today and what to do next.
Your next deadlines
Compliance logic verified May 2026 against Gas Safety (Installation and Use) Regulations 1998, Reg 36. Always cross-check with your own records before relying on this output.
Where standard advice fails
Why most landlord cover articles bury the real duty
Standard UK landlord guides spend most of their words on the cover product, features, premium, customer ratings. The legal duty is mentioned in passing, usually one paragraph, as if the CP12 were a tickbox. That ordering is wrong because the legal duty is the only part that can put a landlord in court.
Boiler cover does not create the duty. The duty exists under Regulation 36 of the Gas Safety (Installation and Use) Regulations 1998, regardless of whether you have any cover at all. Cover is one way of meeting the duty. You can also pay an independent Gas Safe engineer for a standalone CP12 every year and skip the monthly premium. Either route is legal. Neither is optional.
The second thing most articles understate is the tenant access problem. Tenants who refuse access do not let you off the duty, you still have to demonstrate "reasonable steps". That means a documented paper trail of at least three written attempts with escalating notice. The HSE keeps prosecuting landlords who did not paper the file, not because they cared less about safety but because they did not record their effort.
And third, the rule that affects evictions: no valid CP12 = no valid Section 21 notice. That is the single most expensive consequence of slipping on the paperwork. It does not come up in cover-product reviews because it has nothing to do with the cover. It has everything to do with whether the law treats you as a compliant landlord.
The legal core
The six landlord duties under UK gas safety law
Each item below maps to a specific clause in the Gas Safety (Installation and Use) Regulations 1998. The legal basis is shown so you can check the regulation yourself.
Annual gas safety check
Every gas appliance, fitting and flue checked by a Gas Safe registered engineer within 12 months of the last check.
Gas Safety (Installation and Use) Regulations 1998, Reg 36(3)
Use a Gas Safe registered engineer
No other certification counts. Verify on the live register before booking. See the Gas Safe Register guide.
GSIUR 1998, Reg 3
Keep records for 2 years
Every CP12 must be retained for a minimum of two years from the date of the inspection.
GSIUR 1998, Reg 36(6)
Tenant copy within 28 days
Existing tenants get a copy of the CP12 within 28 days of the inspection. New tenants get it before they move in.
GSIUR 1998, Reg 36(6)(b)
Maintain pipework, appliances and flues
A safety check is not the same as maintenance. The landlord must also keep the system in a safe condition all year round.
GSIUR 1998, Reg 36(2)
Right of access
Give reasonable written notice to inspect. If a tenant refuses repeatedly, document the attempts, the HSE accepts evidence of reasonable efforts.
GSIUR 1998 guidance
Insider insight
The four ways CP12 non-compliance actually hits you
Landlords often see the CP12 as paperwork. The HSE sees it as the single document standing between the tenant and a possible carbon-monoxide death. That is why prosecutions are common, and why the consequences are heavier than most articles let on.
Unlimited fine
The Court can impose a fine with no statutory upper limit for serious breaches.
Up to 6 months in prison
For serious breaches that endanger life. Applies to the individual landlord, not just a company.
Civil claims by tenants
Tenants can sue for damages, especially if illness or injury follows a CO leak.
Section 21 notice voided
A landlord cannot legally serve a Section 21 (no-fault eviction) notice without an up-to-date CP12 lodged with the tenant.
Penalties under the Health and Safety at Work etc. Act 1974, as applied to gas safety breaches by the HSE.
The four cover routes
Which landlord boiler cover is right for your property?
The cheapest legal route is not the cheapest monthly headline number, it is the one that bundles the CP12 you would have paid for anyway.
CP12 only (standalone safety check)
Option 1£80 to £130 / one-off
Includes: Annual gas safety inspection + signed CP12 certificate.
Best when: You manage the property closely and prefer to pay for repairs as they happen.
Landlord boiler cover (basic)
Option 2£12 to £18 / per month
Includes: CP12 + boiler repairs (parts and labour) + 24/7 callout.
Best when: A single rental, modern boiler, you want one direct debit and no admin.
Landlord boiler + heating cover
Option 3£18 to £28 / per month
Includes: CP12 + boiler + radiators + pipework + controls.
Best when: Older property, larger system, higher chance of non-boiler heating faults.
Multi-property portfolio cover
Option 4Quote-based / bespoke
Includes: CP12s scheduled, all properties on one account, single point of contact.
Best when: You let three or more properties, single-property pricing stops making sense.
Inside the inspection
What a Gas Safe engineer actually checks before issuing a CP12
The engineer signs the certificate only when each of these is in writing. Watch for any one of them being skipped, it invalidates the document.
Gas tightness across all appliances and fittings (standing and working pressure).
Burner pressure and gas rate against the manufacturer data plate.
Flame failure devices function correctly under load.
Flue flow removes products of combustion safely (smoke test or analyser).
Ventilation is sufficient for every gas appliance in the property.
Stability brackets and physical condition of every appliance.
Carbon monoxide alarm presence, landlord duty since the 2022 amendments to the Smoke and Carbon Monoxide Alarm Regulations.
A clean compliance routine
A simple yearly routine that keeps you on the right side of the law
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1
Diarise the renewal at the 10-month mark.
You can renew between months 10 and 12 without losing time on the certificate. Booking earlier than 10 wastes part of the cycle.
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2
Verify the engineer on the live register.
Search by licence number on the Gas Safe Register. The card is not the same as the live record. See the Gas Safe guide.
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3
Issue the CP12 to the tenant within 28 days.
Email + post leaves the cleanest evidence trail. New tenants must receive a copy before move-in day.
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4
File the CP12 in a property-specific folder for 2 years.
Two years is the legal minimum. Many letting agents keep the entire tenancy history. PDF + cloud backup is sensible.
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5
Pair the CP12 with a CO alarm check.
Since the 2022 amendments to the Smoke and Carbon Monoxide Alarm Regulations, landlords must ensure a CO alarm is in every room with a fixed combustion appliance. The annual check is the natural moment to test them.
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6
Bundle with cover only if it pays off.
If you let one or two properties and the boiler is over 10 years old, landlord cover usually pays back. For modern boilers in low-turnover lets, a standalone annual CP12 is cheaper.
Landlord gas safety FAQ
CP12 and landlord cover questions, answered
"CP12" is the everyday name for the Landlord Gas Safety Record, the document a Gas Safe registered engineer signs at the end of the annual gas safety check. The number 12 comes from the original CORGI form CP12. The Gas Safe Register kept the name even after the form was redesigned. Every UK rental property needs one, renewed every 12 months.
Every 12 months. You can book the new check between 10 and 12 months after the previous one without losing days from the existing certificate, under a rule introduced in April 2018, the new check inherits the original expiry date. Booking earlier than 10 months wastes part of the cycle.
Two years from the date of inspection, under Regulation 36(6) of the Gas Safety (Installation and Use) Regulations 1998. In practice many letting agents keep them for the full tenancy. Tenants must have a copy within 28 days; new tenants must have it before they move in.
You document the attempts. The HSE accepts reasonable efforts as a defence, typically that means at least three written requests, escalating notice periods, and a final letter explaining the legal duty. Do not force entry. The HSE landlord pages set out the expected paper trail.
It can, most landlord-specific plans include the annual CP12. Check the wording. A homeowner cover plan with a "service" included is not the same: a service does not always produce a CP12 unless the engineer is asked to issue one. If in doubt, book the inspection separately and add cover for breakdowns only.
The Gas Safety (Installation and Use) Regulations 1998 apply across Great Britain (England, Scotland, Wales). Northern Ireland has equivalent regulations enforced by HSENI; the practical duties, annual check, 2-year records, 28-day tenant copy, are the same. Scotland has additional Repairing Standard obligations under the Housing (Scotland) Act 2006 that overlap with gas safety.