If you let a property with gas in England, the Landlord Gas Safety Record, often called a CP12 or gas safety certificate, is one of those bits of paperwork you cannot afford to get wrong. The good news is it is not complicated once you understand what it is, who can do it, and what to do with it afterwards. This guide walks through it all, with a look at how Hello Neighbour has handled the 2,660 gas safety certificates it has arranged for the landlords we work with.
A quick word before we start. Unlike an EICR, which lasts five years, a gas safety certificate must be renewed every single year. There is no grace period and no exceptions. If your current certificate is within two months of expiry, do not wait, because the date can slip away from you. If you want us to take care of the renewal, book yours with Hello Neighbour here and we will handle the rest.
Summary
- A gas safety check is a legal requirement every 12 months in England, Wales and Scotland, for any property the landlord provides with gas appliances, pipework or flues
- The work must be carried out by a Gas Safe registered engineer. Checking the engineer against the official Gas Safe Register is the simplest verification, and you should always ask to see their ID card
- There is no single pass-or-fail verdict, but under the Gas Industry Unsafe Situations Procedure the engineer will flag any unsafe appliance as Immediately Dangerous (ID) or At Risk (AR), and unsafe appliances must be made safe straight away
- Tenants must get a copy within 28 days of the check, and new tenants before they move in. You must keep records for at least two years
- You can renew within the two months before expiry without losing your annual date, which keeps your renewal anchored to the same time each year
- Penalties for breaching the Gas Safety Regulations are severe: an unlimited fine and up to six months in prison in the magistrates’ court, or up to two years for the most serious cases, plus invalidated insurance
- In England, a carbon monoxide alarm is a legal requirement in any room with a fixed combustion appliance (gas boilers, gas fires, oil boilers, log burners and similar), with gas cookers as the only exception. Wales and Scotland have their own, slightly different rules
- Hello Neighbour can arrange your annual gas safety certificate for £95 inc. VAT
If you have questions about gas safety, compliance, or anything else to do with letting or managing a property, get in touch.
What a gas safety certificate actually is
A gas safety certificate is the everyday name for a Landlord Gas Safety Record, or LGSR. Many people still call it a CP12, a name that comes from the old CORGI Proforma 12 form. Whatever you call it, it is a written record confirming that the gas appliances, pipework and flues in a property have been inspected and are safe to use.
It covers the gas equipment the landlord has provided: the boiler, gas fires, gas hobs and ovens, the associated pipework, and the flues and chimneys that carry combustion gases safely out of the building. It does not cover a tenant’s own gas appliances, although the connecting installation and flue still do need to be safe.
A Gas Safe registered engineer carries out the inspection, checking that each appliance is burning correctly, that it is at the right operating pressure, that flues are clearing fumes properly, and that all safety devices work. They then issue the record, which lists every appliance checked and notes any defects. The legal standard sits in the Gas Safety (Installation and Use) Regulations 1998, and the whole regime is enforced by the Health and Safety Executive (HSE).
One important difference from an EICR is worth flagging early. A gas safety check looks at appliances and safety, not the broader condition of the gas installation in the way an EICR assesses the electrics. It is also annual, not five-yearly, which makes it the single most frequent piece of safety compliance most landlords deal with.
Why gas safety certificates matter (and why you cannot skip them)
There are three reasons to take gas safety seriously.
The legal one. Under the Gas Safety (Installation and Use) Regulations 1998, a landlord must arrange an annual gas safety check by a Gas Safe registered engineer for every relevant property. This is not optional and it cannot be signed away in a tenancy agreement. Breaching the Regulations is a criminal offence: on summary conviction in the magistrates’ court it can carry an unlimited fine and up to six months in prison, and the most serious cases tried in the Crown Court can carry up to two years. The HSE prosecutes landlords every year.
The insurance one. Almost every landlord insurance policy requires a valid gas safety certificate. Without one, a claim connected to a gas fire, explosion or carbon monoxide incident is likely to be refused, leaving you personally exposed to the full cost.
The human one. Carbon monoxide is colourless, odourless and kills. Faulty gas appliances cause poisonings, fires and explosions every year in the UK. An annual gas safety check is the simplest way to know your tenants are safe, and to evidence that you met your duty of care if anything ever goes to court.
Who is qualified to do one, and how to check
Gas work is different from electrical work in one crucial respect: there is a single, legally mandated register. The inspection must be carried out by an engineer on the Gas Safe Register, the official body that replaced CORGI in 2009. It is illegal for anyone who is not Gas Safe registered to work on gas appliances in a let property, full stop. There is no "competent person" alternative the way there is for electrical work.
That actually makes verification simpler than it is for an EICR. There are two checks every landlord should do:
- Check the register. Search the engineer or business on the official Gas Safe Register before they start. You can do this in seconds at gassaferegister.co.uk/check-an-engineer.
- Ask to see the ID card. Every Gas Safe registered engineer carries a card with their photo, a licence number, a start and expiry date, and a security hologram. The reverse lists exactly which categories of gas work they are qualified for (for example boilers, cookers, or fires). Check the card matches the person and that the work you need is on the list.
Sample Gas Safe ID card. Source: Gas Safe Register.
If an engineer cannot or will not show you their Gas Safe card, do not let them touch the gas. It is the single most important check a landlord can make, and it takes less than a minute.
What is involved, and how to prepare
A gas safety check is quicker than an EICR. For an average property with a boiler and a couple of appliances, expect it to take around 30 to 60 minutes. The engineer needs access to every gas appliance, the boiler and the meter, so a little preparation makes the visit go smoothly:
- Confirm a time in advance with your tenants and make sure someone can let the engineer in
- Clear access to the boiler, the meter and any gas fires or hobs
- Dig out the previous gas safety record so the engineer can see the history
- Make sure the gas and electricity are on, as the engineer needs to fire up appliances to test them
The engineer will then check each appliance for correct operation and pressure, test that flues and chimneys are clearing fumes safely, confirm that ventilation is adequate, inspect the pipework, and check that safety devices cut in as they should. At the end they issue the record listing every appliance and any defects found.
Reading the record: the classifications you need to know
A gas safety record does not use a simple "satisfactory or unsatisfactory" verdict the way an EICR does. Instead, the engineer follows the Gas Industry Unsafe Situations Procedure (GIUSP) — published by the Institution of Gas Engineers and Managers as IGEM/G/11 and supported by the HSE — which gives a single, consistent way of classifying any unsafe appliance or installation. Since the procedure was overhauled in 2015 there are two unsafe-situation classifications you need to know:
- ID, Immediately Dangerous. If operated or left connected to the gas supply, an immediate danger to life or property. With your permission the engineer will disconnect or cap off the appliance there and then, attach a Danger Do Not Use label, and it must not be used until repaired.
- AR, At Risk. One or more faults that could become dangerous if the appliance is operated. The engineer will normally turn it off with your permission, attach the same Danger Do Not Use label, and it should not be used until the fault is fixed.
The consumer-facing message is deliberately the same for both: Danger, Do Not Use. That change was made after the Coroner in the Katie Haines inquest noted how easily an At Risk situation can deteriorate into an Immediately Dangerous one with no human intervention, so engineers no longer present AR as a softer category to the customer.
You may also see an engineer note something as Not to Current Standards (NCS) in their job report or advice. This used to be a third formal classification, but it was removed from the GIUSP in 2015 because such installations are not actually unsafe. NCS now sits in the "best advice" category rather than the unsafe-situations warning system: improvement is recommended but not legally required, similar in spirit to a C3 on an EICR.
An appliance recorded as ID or AR must be made safe before the property can be considered compliant, and any remedial work should be carried out by a Gas Safe registered engineer. Once it is done, get the updated record showing the appliance now passes, and keep it with the original. Note too that an engineer may only turn off or isolate an appliance with the customer’s permission, except in cases of immediate danger.
The most common problems engineers flag include poorly burning or incorrectly pressured boilers, blocked or inadequate flues, insufficient ventilation around appliances, ageing gas fires, and appliances installed or altered by someone who was not Gas Safe registered. It is worth budgeting for the possibility of remedial work each year, just as you would with electrical inspections.
What the record must contain
As a minimum, the record of a gas safety check must contain:
- A description of and the location of each appliance or flue checked
- The name, registration number and signature of the individual carrying out the check
- The date on which the appliance or flue was checked
- The address of the property at which the appliance or flue is installed
- The name and address of the landlord (or their agent where appropriate)
- Any safety-related defect identified and any remedial action taken
- The operating pressure or heat input of each appliance (or, where it is not reasonably practicable to examine these, the combustion performance of the appliance, following the 2018 amendment)
- Confirmation that the safety check has included an examination of the matters referred to in paragraphs (a) to (d) of regulation 26(9) of the Gas Safety (Installation and Use) Regulations 1998
For reference, the record content requirements above are set out in Regulation 36(3)(c) of the Gas Safety (Installation and Use) Regulations 1998. The cross-reference to Regulation 26(9) covers what the safety check itself must examine: the effectiveness of any flue, the supply of combustion air, the operating pressure or heat input, and that the appliance is operating safely.
Who gets a copy, and when
Once you have your gas safety check record, the rules on distribution are specific. You must:
- Give a copy to existing tenants within 28 days of the check. This can be electronic if your tenant is happy to receive it that way
- Give a copy to new tenants before they move in
- For lets of less than 28 days (such as holiday lets), display a copy of the record within the property
- Keep a copy of every gas safety record for at least two years
Storage matters. Digital copies are accepted and most Gas Safe engineers now issue the record electronically on the day. Keep them somewhere you can actually find them, because tenants, councils and the HSE can all ask to see one, and "I had it but I cannot find it" is not a defence. A dated folder per property works well. Many landlords keep the gas record, the EICR and the EPC together so the whole compliance picture for a property is in one place.
How long a gas safety certificate lasts
A gas safety record is valid for 12 months from the date of the check. That is the headline difference from an EICR, which lasts five years. Gas safety is an annual job, every year, for as long as the property is let with gas.
There is one helpful piece of flexibility. You can have the check done at any point in the two months before the current certificate expires without losing your annual date. If your certificate expires on 1 September and you have the check done on 15 July, the new expiry date stays 1 September the following year, not 15 July. This stops your renewal date creeping earlier each year. The catch: if you book more than two months early, the clock restarts from the date of the check, so book within that window if you want to preserve your dates.
It is also worth arranging a check sooner if:
- A new gas appliance or flue has been installed (it must be checked within 12 months of installation)
- Tenants report a problem, smell gas, or a carbon monoxide alarm sounds
- You have just bought a rental property and there is no recent record available
And a genuine emergency overrides everything: if a tenant smells gas, they should call the National Gas Emergency line on 0800 111 999 immediately. Do not wait for the annual check.
What if your tenant will not let the engineer in?
This is one of the most common reasons certificates lapse, and the law is clear that you must not force entry. What the HSE expects instead is evidence that you took all reasonable steps to comply. In practice that means giving proper notice (at least 24 hours in writing, as required by section 11 of the Landlord and Tenant Act 1985), making repeated attempts to arrange access, and writing to the tenant to explain that the check is a legal requirement for their own safety.
Keep a written record of every attempt: dates, times, letters and texts. If access is repeatedly refused, that paper trail is your protection, and it is what the HSE or a court will want to see. Choosing an engineer (or a managing service) who communicates well with tenants makes this far less likely to become a problem in the first place.
Do not forget carbon monoxide alarms
Every year around seven people die from carbon monoxide poisoning caused by gas appliances and flues that have not been properly installed, maintained or that are poorly ventilated, and many more suffer ill health. When fuel does not burn properly, whether gas, coal, wood or oil, it produces carbon monoxide. You cannot see it, taste it or smell it, but it can kill quickly and without warning.
Gas safety does not end with the certificate. A carbon monoxide alarm is a legal requirement in England wherever the property contains a fixed combustion appliance — with the single exception of a gas cooker. That covers the vast majority of rentals, because a gas boiler counts. The rules sit in the Smoke and Carbon Monoxide Alarm (England) Regulations 2015, significantly extended by the Smoke and Carbon Monoxide Alarm (Amendment) Regulations 2022 from 1 October 2022, which is when the requirement was widened from solid-fuel-only appliances (log burners, open fires, coal stoves) to all fixed combustion appliances, including gas. From that date, landlords in England must:
- Fit a carbon monoxide alarm in any room used as living accommodation that contains a fixed combustion appliance. That phrase covers anything that burns fuel to generate heat: gas boilers, gas fires, oil boilers, log burners, wood-burning stoves and fixed water heaters. Gas cookers are the only excepted appliance
- Fit at least one smoke alarm on every storey used as living accommodation
- Make sure every alarm (both smoke and carbon monoxide) is in proper working order at the start of any new tenancy
- Repair or replace any alarm reported as faulty, once you are told and it is found not to be working, as soon as reasonably practicable
A practical point on "any room": government guidance and Shelter Legal confirm that the term covers halls, landings, bathrooms and toilets if a fixed combustion appliance is located there. The room with the boiler is usually the obvious one, but check upstairs too if the boiler is, say, in an airing cupboard on a landing. These rules are enforced by local authorities, which can issue a remedial notice and, where a landlord fails to comply with that notice, a civil penalty of up to £5,000. Fitting a compliant alarm is cheap and quick, and it sits naturally alongside the annual gas check, so it is worth handling the two together.
A word on the rest of the UK. The 2022 Regulations apply in England only. Scotland has separate rules in force since 1 February 2022 that go further: a CO alarm is required wherever there is a fixed combustion appliance or a flue, and they apply to owner-occupied homes too, not just lets. Wales has its own scheme under the Renting Homes (Wales) Act 2016 from 1 December 2022. Northern Ireland’s position sits within building regulations and tenancy rules rather than a dedicated CO alarm regime.
If you have your gas safety check done through Hello Neighbour, we test the carbon monoxide alarms for you as part of the visit, so it is one less thing to think about. If you arrange the check yourself, you can carry out the alarm test yourself: press the test button on each alarm until it sounds, and replace the batteries or the unit if it does not.
Are there rules on how often alarms must be tested?
This is a common point of confusion. The Regulations are precise about two moments and quiet about everything in between. Your hard legal duties are to ensure each alarm is in working order at the start of a new tenancy (a functional test, not just a glance), and to repair or replace an alarm as soon as reasonably practicable once a tenant reports it faulty and it is found not to be working.
What the law does not do is set a prescribed testing frequency during a tenancy. Once a tenant has moved in, day-to-day testing is generally the tenant’s responsibility, and the usual guidance is that they test alarms monthly and report any faults. A renewal or a statutory periodic tenancy with the same tenant does not count as a "new tenancy", so there is no automatic legal trigger to retest at that point.
That gap is exactly why regular, documented property visits matter. They give you a chance to confirm the alarms are still working rather than relying solely on the tenant, and to evidence that you did so.
Using inspections to stay ahead of problems
Because the law leaves the middle of a tenancy largely to the tenant, a structured inspection routine is the best way to make sure no issues have quietly arisen. As we explain in our guide to why property inspections are a key tool for landlords, many landlords settle on a visit every three to six months, with more frequent visits where there is a known concern.
If you carry out six-monthly inspections, a few simple checks help confirm nothing has gone wrong on the gas and safety side between annual certificates:
- Press the test button on every smoke and carbon monoxide alarm to confirm it sounds, and note the date
- Check no alarm has been removed, covered or had its batteries taken out
- Look at gas appliances for obvious warning signs: sooty or yellow-orange flames (rather than crisp blue), staining or scorching around a boiler or fire, excessive condensation, or a pilot light that keeps going out
- Make sure flues, vents and air bricks have not been blocked or covered over
- Ask the tenant whether they have noticed any smell, noise or symptoms such as headaches that ease when they leave the property
- Confirm earlier recommendations or repairs have actually been carried out
The real value of a visit is not just spotting an issue but documenting it. A short written report with dated photographs turns an observation into evidence, and builds a record that protects you if a dispute or possession case arises later. None of this replaces the annual gas safety check or a Gas Safe engineer’s judgement, but it does mean problems get caught early rather than at the next certificate, or worse, after something goes wrong. Hello Neighbour offers a mid-tenancy inspection service that includes these safety checks and a full written report.
What if a tenant raises a concern?
If a tenant reports a problem with gas or with an alarm, how quickly you act depends on how serious it is. Treat anything that could involve gas escaping or carbon monoxide as an emergency.
- Smell of gas, or a carbon monoxide alarm sounding: this is an emergency. The tenant should call the National Gas Emergency line on 0800 111 999 straight away, turn off the gas at the meter if it is safe to do so, open windows and leave the property. Arrange for a Gas Safe registered engineer to attend as soon as possible; do not wait for the annual check.
- Suspected carbon monoxide symptoms (headaches, dizziness, nausea that improve away from home): treat as urgent. Advise the tenant to get fresh air and seek medical advice, call 0800 111 999, and get an engineer out.
- A faulty smoke or carbon monoxide alarm: once a tenant reports it and it is found not to be working, you are legally required to repair or replace it as soon as reasonably practicable. In practice that means days, not weeks, and you should keep a record of the report and your response.
- A non-urgent concern about an appliance (a boiler being noisy or not heating well, for example): arrange for a Gas Safe engineer to inspect it within a reasonable time, and keep the tenant informed.
Across all of these, the principles are the same: respond promptly, use a Gas Safe registered engineer for any gas work, and keep a written record of what was reported, when, and what you did about it. That record is both your compliance evidence and, more importantly, part of keeping your tenants safe.
The wider regulatory picture
The headline regulation is the Gas Safety (Installation and Use) Regulations 1998, enforced by the HSE. But gas safety sits within a wider set of duties:
- The Smoke and Carbon Monoxide Alarm (England) Regulations 2015 (as amended in 2022) cover alarms, as above
- The Housing Health and Safety Rating System (HHSRS) lets councils take action on serious gas and fire hazards independently
- Since 1 May 2026, the Renters’ Rights Act 2025 (which applies in England) has converted assured shorthold tenancies into periodic tenancies and abolished Section 21 no-fault evictions. Your gas safety obligations are unchanged, but losing the no-fault route makes staying compliant and keeping good records more important than ever, since possession now depends on the strength of your paperwork
The requirement applies across most of Great Britain, with some local variation:
- England, Wales and Scotland (Great Britain): annual gas safety checks are required under the Gas Safety (Installation and Use) Regulations 1998
- Northern Ireland: separate but substantively similar legislation applies, the Gas Safety (Installation and Use) Regulations (Northern Ireland) 2004, with the same annual check requirement
How Hello Neighbour handles gas safety
Compliance is one of those jobs where the cost of getting it wrong vastly outweighs the cost of doing it, and gas is the one that comes around every single year. That is why we built our gas safety service the way we did.
We have arranged over 2,660 professional gas safety checks with Gas Safe registered engineers, having trawled the market on the back of managing thousands of properties to get landlords the best price for a reliable service. The cost is a one-off £95 inc. VAT, and it is included as standard in our Management Plus package. We coordinate with your tenants for access, test the carbon monoxide alarms while we are there, share the record with you and the tenants, and track the renewal date so you get a reminder in good time, rather than discovering an expired certificate the hard way.
If an appliance comes back as At Risk or Immediately Dangerous, we manage the remedial work too, get the updated record once it is fixed, and make sure your paperwork is in order. The whole thing is designed so you do not have to think about it again until next year’s renewal, which, of course, we also handle.
The takeaways
- A gas safety check is a legal requirement every 12 months in England, Wales and Scotland for any property let with landlord-provided gas appliances, pipework or flues
- The work must be carried out by a Gas Safe registered engineer. Check them on the official register and ask to see their ID card
- Unsafe appliances are classified as Immediately Dangerous or At Risk under the Gas Industry Unsafe Situations Procedure (IGEM/G/11) and must be made safe straight away by a Gas Safe engineer
- Tenants must get a copy within 28 days (new tenants before they move in), and you must keep records for at least two years
- Renew within the two months before expiry to keep your annual date anchored
- Penalties are severe: an unlimited fine and up to six months in prison in the magistrates’ court (up to two years in the most serious cases), and invalidated insurance
- Do not forget the carbon monoxide alarm requirement that runs alongside the gas check
If you would like Hello Neighbour to arrange yours, you can book it here. And if you have questions about gas safety, compliance, or anything else to do with letting or managing a property, get in touch.
Sources: HSE guidance on gas safety for landlords and letting agents; Gas Safety (Installation and Use) Regulations 1998 (and the 2018 amendment, Regulation 36A); Gas Safe Register landlord guidance; the Gas Industry Unsafe Situations Procedure (IGEM/G/11) for the ID and AR classifications; GOV.UK guidance on the Smoke and Carbon Monoxide Alarm (England) Regulations 2015 as amended in 2022; section 11 of the Landlord and Tenant Act 1985; Renters’ Rights Act 2025; National Gas Emergency Service; Hello Neighbour service pages and insights. This guide is general information for landlords, not legal advice. Gas safety law in Northern Ireland is set out in separate but substantively similar regulations.