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Commercial gas safety inspections & certificates (CP12)

Commercial engineers covering Suffolk, Essex and Cambridgeshire

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Gas safety checks and written records for commercial boiler rooms and gas appliances, the document many people call a commercial CP12. Gas Safe registered (985448). Call 0800 0996 007, WhatsApp 07947 578332 or email to book.

☎ Call 0800 0996 007WhatsApp 07947 578332Email for a quote

Finance available, subject to status

A team of over 10 local engineers · Gas Safe registered 985448 · Commercial only, not domestic · Based at CO10 8NN (Clare, near Sudbury) · Suffolk, Essex, Cambridgeshire & East Anglia

What the inspection covers

  • Each gas appliance checked for safe operation: boilers, warm air and radiant heaters, water heaters
  • Burner pressure and heat input, flame picture and combustion readings
  • Flue checks: flue flow, spillage where relevant, terminals and flue integrity
  • Ventilation assessment of the plant room or boiler house
  • Gas interlock and ventilation proving checks where a system is fitted
  • Safety devices, isolation valves and emergency controls
  • Tightness testing of the installation pipework to IGEM/UP/1, and purging after work where needed
  • A written record listing every appliance, the results and any defects, with our advice on what to do next

Is a commercial CP12 a legal requirement?

"CP12" is a name left over from the old CORGI landlord certificate. The annual landlord gas safety record is a legal requirement for let residential property. For commercial premises the duty is to keep gas appliances and pipework maintained in a safe condition, and many employers, landlords, insurers and managing agents meet that by asking for an annual commercial gas safety inspection and record. Leases often spell out who is responsible. If you have been asked for a "commercial gas safe certificate", this is the inspection you need.

Gas interlocks & plant-room ventilation

Many plant rooms have a gas interlock that shuts off the gas if mechanical ventilation fails. When they misbehave they either trip the whole plant or, worse, have been bypassed. We check they operate as intended during the inspection and fault-find nuisance tripping so the boilers stay on without compromising safety.

Who books this

Facilities and estates teams, commercial landlords and managing agents, schools, care homes, churches and community halls, hotels and factories. See landlords & managing agents and our other sectors.

Commercial gas safety inspections by town

What your gas safety record shows

At the end of the inspection you get a written record you can hand to your landlord, insurer, managing agent or auditor. It sets out:

  • The site address and where each plant room or appliance is located
  • Every gas appliance checked, with its make, model and type, and whether it is flued or flueless
  • The results for each appliance: operating pressure or heat input, combustion readings, flue checks and whether the safety devices worked
  • The ventilation assessment and, where fitted, the gas interlock and ventilation proving results
  • The result of the tightness test on the installation pipework
  • Any defects found, how serious they are and what we recommend
  • The engineer who carried out the work and our Gas Safe registration 985448

Keep the record with your building maintenance file. If you are asked for evidence of gas safety, an up-to-date record that lists every appliance on site is far more useful than a single certificate for one boiler.

How an inspection visit runs

  1. Booking. You tell us the site, how many appliances there are and where they are, and send your last gas safety record if you have one. We agree a date and a window when the plant can be turned off briefly.
  2. Arrival. The engineer reports to your site contact, completes any sign-in or site induction and confirms access to plant rooms, roof plant and the gas meter.
  3. Pipework tightness test. The gas supply is isolated and the installation pipework is tested for tightness, then purged and relit safely afterwards.
  4. Appliance checks. Each boiler, heater and water heater is checked in turn: burner pressure or heat input, flame picture, combustion readings, flue and terminal, and safety devices.
  5. Ventilation and interlocks. Plant-room ventilation is checked against the appliances it serves, and any gas interlock or ventilation proving system is tested to show it shuts off the gas when it should.
  6. Report and walk-through. The engineer runs through the findings with you, leaves or emails the written record, and you get a separate price for any remedial work. Nothing is done beyond the inspection without your go-ahead.

Inspections are carried out by our team of over 10 local engineers, based at CO10 8NN near Sudbury and covering commercial sites across Suffolk, Essex, Cambridgeshire and beyond.

The rules and standards behind the inspection

  • Gas Safety (Installation and Use) Regulations 1998: employers and the self-employed must make sure gas appliances, flues and pipework at work are maintained in a safe condition, and all gas work must be done by a Gas Safe registered business. Ours is registration 985448.
  • HSE Approved Code of Practice L56: the HSE's guidance on how those regulations apply, including maintenance and safety checks.
  • IGEM/UP/1: tightness testing and direct purging of commercial and industrial gas installations.
  • IGEM/UP/10 and BS 6644: the standards for flued gas appliances in commercial premises and for larger gas-fired boiler installations, covering flues, combustion air and plant-room ventilation.
  • Gas Industry Unsafe Situations Procedure: how defects are classified as Immediately Dangerous or At Risk, and what the engineer must do about each.

We check against these standards rather than just ticking boxes, so the record shows you clearly what is safe, what needs attention and how urgent it is.

Common problems we find on commercial sites

  • Blocked or undersized ventilation: grilles painted over, covered by stored items or reduced when a plant room was refitted.
  • Bypassed or faulty gas interlocks: links or overrides left in place after nuisance tripping, which removes the protection the interlock is there to give.
  • Flue problems: corroded or separated flue joints, missing supports, and terminals too close to openable windows, air intakes or walkways.
  • Poor combustion: dirty burners, worn components or incorrect gas pressure giving high carbon monoxide readings.
  • Valves that let by: isolation valves that no longer shut off fully, found during the tightness test.
  • Access and labelling: emergency control valves that are hard to reach or unlabelled, and pipework that is not identified.

Most of these are straightforward to fix, and it is far better to find them on a planned visit than during a breakdown. If repairs are needed, see commercial boiler repair and plant room repair.

How to prepare for your inspection

  • Make sure we can get into every plant room, roof space and meter position, and arrange keys or an escort if needed.
  • Have your last gas safety record and service sheets to hand, so we can check previous defects have been dealt with.
  • Agree a short window when heating and hot water can be off, especially in schools, care homes and hotels.
  • Clear stored items away from boilers, ventilation grilles and flues.
  • Share your asbestos register for older buildings, so the engineer knows what to avoid disturbing.

To keep everything on one schedule, many sites add the annual inspection to a planned preventative maintenance contract alongside commercial boiler servicing.

Questions we get asked

What is a commercial CP12?

It is the common name for a commercial gas safety inspection record: a written report of the gas appliances, flues, ventilation and pipework checked on a commercial site, with the results and any defects found. The name comes from the old CORGI landlord form, but on commercial premises what matters is the content of the record, not the form number.

How often do I need a commercial gas safety inspection?

Annually is the usual expectation from landlords, insurers and managing agents, and it fits neatly with the annual boiler service. Your lease, insurance policy or the appliance manufacturer may set a specific interval, so check those too. Some sites with heavily used plant choose to have checks more often.

Can you do the inspection at the same visit as the service?

Yes. Many clients combine the annual service and the gas safety inspection to reduce disruption, because the plant only needs to be isolated and accessed once. You still get a separate written record of the safety checks.

What is the difference between a service and a gas safety inspection?

A service is maintenance: cleaning burners and heat exchangers, replacing worn parts and setting the boiler up to run efficiently. A gas safety inspection checks that each appliance, its flue, the ventilation and the pipework are safe, and records the results. A service usually includes many safety checks, but the inspection record is what landlords, insurers and auditors ask to see.

How long does a commercial gas safety inspection take?

It depends on how many appliances there are and how spread out they are. A single boiler room is often done in a few hours, while sites with several plant rooms, rooftop heaters or warm air units across a warehouse can take a day or more. Send us a list of the appliances and we will give you an estimate.

Will the heating be off during the inspection?

Each appliance is off for part of the time while it is checked, and the gas supply is isolated briefly for the tightness test. On cascade and multi-boiler sites we work through the plant in turn so the building stays warm, and we agree timings with you before we start.

What happens if you find a dangerous defect?

We follow the Gas Industry Unsafe Situations Procedure. An appliance classed as Immediately Dangerous is disconnected or turned off with your permission, and one classed as At Risk is turned off and labelled. We explain the risk in plain terms, give you a written warning notice, and quote to put it right.

Do you inspect oil-fired or LPG plant?

LPG appliances are gas appliances, so they are inspected and recorded in the same way under our Gas Safe registration 985448. Oil-fired boilers are not covered by gas safety law, but our OFTEC trained engineers carry out oil boiler servicing and safety checks and give you a written record.

Do you issue domestic landlord gas safety certificates?

No. We are commercial only. Our inspections cover commercial boiler rooms and commercial gas appliances.

How do I book or get a quote?

Call 0800 0996 007, WhatsApp 07947 578332, or email [email protected] with the site, fuel and what you need. A list of appliances, or a copy of your last gas safety record, helps us quote accurately. Rates can be negotiated.

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