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Croydon Heating
& Plumbing

Croydon & the CR postcodes

Landlord gas safety certificates in Croydon

A landlord gas safety record, still called a CP12 by almost everyone, is the annual check the law requires on every gas appliance and flue you provide to a tenant. We carry it out across Croydon and the CR postcodes for £75, and you get the record by email the same day, usually within an hour of us leaving. If something on the property fails, we tell you on the spot what the classification means, what it will cost to put right, and whether the appliance can stay on until it is fixed.

What you get

What the job includes

  • A full safety check on every gas appliance the landlord provides: boiler, gas fire, gas cooker or hob, water heater and any back boiler still in service.
  • Gas rate and operating pressure measured against the manufacturer’s data plate, not estimated, so an appliance running rich or starved shows up as a number on the record.
  • A flue flow test and a spillage test on every open-flued appliance, with the extractor fans and trickle vents in the property set to the worst realistic case.
  • Ventilation checked against the appliance heat input, including air bricks that have been blocked, painted over or built behind a fitted kitchen unit.
  • A tightness test on the gas installation from the emergency control valve, plus a visual inspection of accessible pipework for corrosion, unsupported runs and old lead or steel sections.
  • Safety devices proved: flame supervision, overheat cut-offs, the boiler pressure relief and, on room-sealed appliances, the case seal integrity.
  • The emergency control valve located and confirmed accessible and labelled, which is the single most common thing missed in converted Croydon flats where the meter sits in a communal hallway cupboard.
  • A signed Landlord Gas Safety Record listing every appliance, its classification, the defects found and the engineer’s Gas Safe licence number, emailed as a PDF and posted if you want a paper copy.
  • Where an appliance fails, the Gas Industry Unsafe Situations Procedure applied properly: a Warning Notice, a labelled appliance and a written explanation of what Immediately Dangerous or At Risk actually means for your tenant that night.

Local knowledge

Croydon licensing from September 2026, and the flues nobody can see

From 25 September 2026 Croydon Council is running a selective licensing scheme covering privately rented homes in fourteen wards, among them Thornton Heath, West Thornton, Bensham Manor, Broad Green, Selhurst, South Norwood, Woodside, Addiscombe East and West, Fairfield, Waddon, Norbury Park, Norbury and Pollards Hill, and South Croydon. A separate additional licensing scheme picks up smaller HMOs. Licence conditions require a current gas safety record for the property, and the council can ask to see it. That matters more here than in most boroughs because CR7 has one of the deepest private rented sectors in south London, close to a third of households, with SE25 and SW16 not far behind. A large number of Croydon landlords who have never had to hand paperwork to the council are about to be asked for it, and a certificate that has quietly lapsed is no longer a private problem. The practical advice is to get the check done and dated well before the licence application rather than after, because if an appliance fails you want the repair finished and the record clean before anyone official reads it. The second Croydon-specific thing is the housing stock itself. Thornton Heath, Selhurst, South Norwood and Broad Green are dense with late Victorian and Edwardian terraces that were split into flats, and then split again, often in the 1980s and 90s with no drawings kept. The combination boiler ends up in a kitchen or a hall cupboard, and the flue is run horizontally for four or five metres above a plasterboard ceiling or behind boxing to reach an outside wall. Since the concealed flue rules came in, an engineer who cannot see the whole flue run cannot pass the appliance. Without inspection hatches, the boiler is classified At Risk and, with the tenant’s permission, turned off. This is comfortably the most common reason a Croydon flat fails a CP12, and it catches out landlords who have had the same boiler pass for years under engineers who never looked up. If your property is a converted flat with a boiler that is not on an outside wall, tell us when you book. We will bring hatches and fit them on the same visit rather than turning up, failing it and leaving your tenant without hot water while you find a carpenter.

How it goes

What happens, step by step

  1. Booking and getting in

    Tell us the address, how many gas appliances there are and who holds the keys. If the property is tenanted we will contact the tenant directly to agree a time, which is usually faster than a chain of messages through you. We work Monday to Saturday, 7am to 8pm, so an early or late slot can be arranged for tenants who work. If access has already failed once, say so, because the approach changes: we will document each attempt in writing so you have evidence you took reasonable steps.

  2. Identifying every appliance

    The engineer walks the property first and lists what is actually there, which is not always what the last certificate says. Decommissioned back boilers behind blocked fireplaces, a gas point capped in a bedroom, a second meter in a converted flat: all of it goes on the record. Appliances you provide are your legal responsibility. A cooker the tenant brought with them is not, but the installation pipework and the connection to it still are, and we check those.

  3. Tightness test and pipework

    We locate the emergency control valve, confirm it turns and that the tenant can reach it, then run a tightness test on the whole installation from the meter. A property that will not hold pressure has a leak somewhere, and finding it is a separate job we price before starting. We also look at what the pipework is made of and how it is supported. Old steel and lead in a converted terrace is common and is not automatically a failure, but it changes what we recommend.

  4. Appliance checks and combustion

    Each appliance is fired and checked working: gas rate against the data plate, operating pressure, burner condition, heat exchanger and case seals, and every safety device proved to shut the appliance down as designed. On a modern condensing boiler we take a flue gas analyser reading and record the ratio, which is the honest measure of whether it is burning cleanly. On an older open-flued appliance we check the heat exchanger for the corrosion and soot patterns that mean products of combustion are coming back into the room.

  5. Flue, ventilation and carbon monoxide

    The full flue run is inspected, including any concealed section, which is where inspection hatches matter in a converted flat. On open-flued appliances we do a flue flow test and then a spillage test with every extractor fan running and internal doors closed, because that is the condition that actually kills people. Air vents are measured against the appliance heat input. We also check you have a working carbon monoxide alarm in each room with a fixed combustion appliance, which has been a legal requirement in rented homes in England since October 2022.

  6. The record, and what happens if something fails

    You get the signed record as a PDF the same day, listing each appliance and its outcome. If everything passes, that is the job done for another twelve months. If something fails, the engineer classifies it under the industry procedure as Immediately Dangerous, At Risk or Not to Current Standards, issues a Warning Notice and, for the first two, asks the tenant for permission to turn the appliance off and label it. You get a call before we leave the property explaining what failed, what it costs to fix and whether it is worth fixing at all on a boiler of that age.

  7. Issuing to your tenant

    The law puts the duty on you to hand the record over, not on us, so we send it in a form you can forward without editing. Existing tenants must have a copy within 28 days of the check. New tenants must have it before they move in. Keep every record for at least two years, because the two-year run of paperwork is what proves a pattern of compliance if anyone ever asks.

Before you ring

Questions we get asked

How much is a gas safety certificate in Croydon?

We charge £75 for a landlord gas safety certificate, and that is the price whether the property has one appliance or three. There is no extra for evening or Saturday appointments and no separate charge for issuing the record. If a defect is found, any repair is quoted separately and you decide before we do anything.

What is the difference between a CP12 and a gas safety certificate?

Nothing. CP12 was the form number on the old CORGI paperwork and the name stuck, so landlords, agents and councils all still use it. The correct current name is a Landlord Gas Safety Record. If an agent asks you for a CP12 and we send you a Landlord Gas Safety Record, that is the same document and it will be accepted.

Do I need one if I live in the property myself?

No. The annual check is a landlord duty under the Gas Safety (Installation and Use) Regulations 1998, and it does not apply to owner-occupiers. Plenty of Croydon homeowners still book one, usually because they are selling, because a buyer has asked, or because they have inherited a house and want to know the state of an old back boiler before they let anyone use it. An annual boiler service at £90 is generally the more useful spend for a home you live in, since it maintains the appliance rather than only inspecting it.

My tenant will not let the engineer in. What am I supposed to do?

You are expected to take all reasonable steps to get the check done, and you need to be able to show what those steps were. Write to the tenant, offer specific dates including evenings and Saturdays, keep copies of every letter and message, and follow up when they are ignored. Do not let yourself in without agreement. If the tenant continues to refuse, the evidence trail is what protects you, and in the worst cases landlords apply to court for an access order.

How long does a gas safety check take?

A one-bedroom Croydon flat with a single combi boiler is usually forty minutes to an hour. A three-bedroom house with a boiler, a gas fire and a gas hob is more like ninety minutes. Add time if the flue is concealed and hatches need cutting, or if the meter is in a communal cupboard and someone has to find the key.

What happens if an appliance fails the check?

It is classified under the Gas Industry Unsafe Situations Procedure. Immediately Dangerous means the appliance is unsafe in use now and, with permission, it is turned off, labelled and capped. At Risk means a defect exists that could become dangerous, and it is also turned off with permission. Not to Current Standards means it does not meet today’s rules but is not unsafe, so it stays on and goes on the record as advice. In every case you get a Warning Notice, and the property does not get a passing certificate until the fault is corrected and rechecked.

Can you do the certificate and the boiler service at the same visit?

Yes, and it is the sensible way to do it. They are different jobs, though people often assume they are one. The certificate is an inspection that records whether the appliance is safe on the day, at £75. A service is maintenance: the boiler is stripped down, the burner and heat exchanger cleaned, the condensate trap emptied and the Benchmark logbook stamped, at £90. Booking both means one appointment, one disruption to your tenant and one set of paperwork.

When can I get next year’s check done without losing my date?

Any time in the two months before the expiry date. Since the rules changed, a check carried out inside that window keeps the original anniversary date rather than resetting it, so booking early does not shorten your next certificate. If you let it lapse and check late, the new date runs from the day of the check and you have a gap in the record that a council or an agent can see.

Does the certificate cover my tenant’s own gas cooker?

The appliance itself is not your legal responsibility if the tenant brought it and owns it, so it is not part of the landlord duty. The installation pipework, the bayonet connection and the flexible hose are yours, and we check those. In practice, if a tenant’s cooker is obviously unsafe the engineer will tell you and the tenant, because leaving a known hazard in a property you own is not a position anyone wants to defend later.

Are free gas safety checks a real thing?

They exist, but rarely for the people asking. Gas suppliers have to offer one free safety check a year to certain vulnerable customers who own their home and receive a means-tested benefit. It does not extend to rented properties, so a landlord cannot use it to cover the annual duty. If you are letting a home in Croydon, the check is your cost.

What are the penalties for not having one?

The Health and Safety Executive enforces the gas safety regulations and prosecutes landlords who ignore them. Cases carry unlimited fines and, at the serious end where someone has been harmed, custodial sentences. Beyond the criminal side, a missing record will complicate a property licence application, an insurance claim after an incident and any dispute with a tenant. It is a £75 job with a very poor risk-to-reward ratio if skipped.

How quickly can you come out?

Most gas safety certificates in Croydon, Thornton Heath, South Norwood, Norbury, Purley and the rest of the CR postcodes are booked within two or three working days, and same-day slots often exist if a tenancy start date is closing in on you. Call 07534 841885 with the address and the number of appliances and we will give you a time rather than a window that spans the afternoon.

Can I check the engineer is genuinely registered?

You should. Every engineer who arrives carries a Gas Safe ID card with a photograph, a licence number and an expiry date, and the back of the card lists exactly which appliance types that engineer is qualified to work on. Our registration number is 919881. Ask to see the card, and check the back as well as the front, because being registered for boilers does not automatically mean being registered for gas fires.

Need this doing?

Ring us, or send the form and we come back with a price.