Commercial Plant Commissioning Certificate (CP15)
Commissioning certificates for new commercial boilers, warm air heaters, and industrial gas plant. Required for Building Regulations compliance.
Officially RegisteredWhat is a CP15 Certificate?
The CP15 certificate is issued when a new commercial gas boiler, warm air heater, or other commercial gas plant is commissioned for the first time. It confirms the appliance has been correctly installed, tested, and is safe to operate.
The CP15 certificate is issued when a new commercial gas boiler or flue system is commissioned.
This certificate confirms that the installation has been properly commissioned and is safe to use.
Our engineers will test all safety devices, controls, and ensure the appliance is operating within manufacturer specifications.
Commissioning includes verifying correct gas pressure, burner settings, safety interlocks, and flue integrity.
Why Do You Need a CP15 Certificate?
Building control and insurance companies require commissioning certificates as proof that new commercial gas installations have been properly set up. Without a CP15, the installation may not comply with Building Regulations Part J.
📋 Legal Requirement
Under Building Regulations and Gas Safety (Installation and Use) Regulations 1998, all new gas appliance installations must be commissioned by a Gas Safe registered engineer and the appropriate certificate issued.
🔄 How Often?
Issued once at the time of commissioning. The appliance then requires annual safety checks under a separate certificate (e.g., CP42).
Gas Appliances Covered & Required Qualifications
Each appliance type requires the engineer to hold a specific ACS (Accredited Certification Scheme) qualification on their Gas Safe registration. Our engineers hold all of the qualifications listed below.
| Appliance | Gas Safe Qualification Required |
|---|---|
| Commercial cast iron sectional boiler | COCN1 + CIGA1 (Indirect-fired Heating) |
| Commercial condensing boiler | COCN1 + CIGA1 (Indirect-fired Heating) |
| Warm air heater (direct fired) | COCN1 + CDGA1 (Direct-fired Heating) |
| Warm air heater (indirect fired) | COCN1 + CIGA1 (Indirect-fired Heating) |
| Radiant tube heater | COCN1 + CORT1 (Overhead Radiant Heaters) |
| Radiant plaque heater | COCN1 + CORT1 (Overhead Radiant Heaters) |
| High-efficiency modular boiler | COCN1 + CIGA1 (Indirect-fired Heating) |
| Steam boiler | COCN1 + CIGA1 (Indirect-fired Heating) |
| Commercial water heater (storage) | COCN1 + CIGA1 (Indirect-fired Heating) |
| Overhead door heater / air curtain | COCN1 + CDGA1 (Direct-fired Heating) |
Who Needs This Certificate?
⚠️ What Happens Without a Valid CP15?
Operating without a valid gas safety certificate puts your business, staff, and customers at serious risk:
- ✗Non-compliance with Building Regulations
- ✗Insurance claims may be denied
- ✗HSE enforcement action
- ✗Appliance warranty may be voided
CP15 Inspection Checklist
Every item below is verified by our Gas Safe registered engineer during the inspection:
Verify installation complies with manufacturer instructions
Check gas supply pressure at the meter and appliance
Test all safety interlocks and controls
Verify correct burner settings and gas rate
Carry out flue flow and spillage tests
Perform combustion analysis (CO, CO₂, O₂)
Check ventilation requirements are met
Test emergency shut-off valve operation
Verify condensate drainage (if condensing boiler)
Complete and issue CP15 commissioning record
Our Gas Safety Inspection Process
Thorough Visual Assessment
Our engineer examines every gas appliance, pipe run, and fitting for wear, corrosion, or non-compliant installation before any testing begins.
Pipework Integrity Testing
We pressurise the gas pipework downstream of the meter and monitor for any drop, confirming no leaks exist within your installation.
Flue & Ventilation Checks
We verify that all flues draw correctly and combustion gases are safely evacuated, protecting your premises from carbon monoxide build-up.
Combustion Performance Analysis
Using calibrated flue-gas analysers, we measure CO, CO₂, and O₂ concentrations to confirm each appliance burns efficiently and within safe limits.
On-the-Spot Certification
Once every check passes, your Gas Safe registered engineer issues the relevant certificate immediately — no waiting, no follow-up visits.
Scope of the Inspection — From the Meter Onwards
Downstream of the Gas Meter Only
By regulation, our engineers inspect and test the gas installation from the outlet of the gas meter onwards. Everything upstream — the service pipe and the meter itself — falls under the gas transporter's responsibility.
Included in the inspection:
- ✓ All internal gas pipework from the meter to each appliance
- ✓ Every connected gas appliance (boilers, cookers, heaters, etc.)
- ✓ Isolation valves and emergency controls
- ✓ Flue systems, ventilation openings, and extraction
- ✓ Operating pressure at each appliance
Not included:
- ✗ The incoming supply pipe before the meter (gas transporter's asset)
- ✗ The gas meter itself (owned by your gas supplier)
- ✗ Any leak or fault on the supply side of the meter
Suspect a gas leak before the meter? Call the National Gas Emergency Service on 0800 111 999 immediately — it is free and available 24/7.
Understanding Inspection Outcomes
Every appliance inspected receives one of three classifications. Knowing what each means helps you respond quickly and keep your business running safely.
Satisfactory
The appliance meets all current standards and is safe to operate. Simply schedule your next annual check and continue trading with confidence.
At Risk (AR)
The appliance falls short of current standards but poses no immediate threat to life. Continued use is at the responsible person's discretion while remedial work is arranged promptly.
- • Ventilation below recommended levels
- • Minor flue joint deterioration
- • Overdue servicing or worn seals
- • Damaged flame supervision device
Immediately Dangerous (ID)
The appliance poses an immediate risk to life. The engineer must disconnect and isolate it on the spot. Reconnection is only permitted after a qualified repair and a fresh safety inspection.
- • Active gas leak detected
- • Blocked or severed flue
- • Dangerously high CO readings
- • Flame failure device bypassed
- • Critical ventilation deficiency
Warning Notices Explained
When a fault is identified, the engineer records it formally. Here is what each notice type means for you and your premises:
At Risk Notice
Issued when an appliance does not fully conform to current standards yet is not life-threatening. The responsible person — landlord, manager, or business owner — is informed and should arrange repairs without delay.
Practical impact: The appliance may remain in use at your own risk while repairs are scheduled. However, if you decline to act, the engineer can escalate the classification to Immediately Dangerous.
Immediately Dangerous Notice
Issued when there is a direct and immediate risk to life. The engineer disconnects and caps the gas supply to the appliance without exception.
Practical impact: The appliance is labelled "DO NOT USE" and cannot be reconnected until a Gas Safe registered engineer completes repairs, confirms safe operation, and issues a new safety record.
CP15 Certificate Pricing
Prices start from £150 + VAT for 1 gas appliance. Additional appliances are charged at £25 + VAT each.
£150
1 appliance
£175
2 appliances
£200
3 appliances
£225
4 appliances
Gas Safe Engineer Services in the UK
Our Gas Safe registered engineers cover the full range of commercial and domestic gas, boiler, heating and plumbing works in the UK.
Commercial Gas Safe Engineer in the UK
Commercial Gas Safe registered engineer in the UK — qualified across COMCAT 1–5, CODNCO1 and CORT1 for catering, plant rooms, pipework and certification.
- Full commercial Gas Safe ticket
- Catering, plant & pipework
- Same-day commercial response
Commercial Gas Safe Plumber in the UK
Commercial Gas Safe plumber in the UK — for restaurants, offices, schools and industrial premises needing combined gas, hot water and plumbing works under one engineer.
- Commercial gas + plumbing in one visit
- Catering, washroom & plant room work
- Out-of-hours scheduling
Local Gas Safe Engineer in the UK
Local Gas Safe registered engineer in the UK — fast response from an engineer who knows your area, for boiler, heating, plumbing and certificate jobs.
- Local engineer, local response times
- Domestic & light-commercial jobs
- Boiler repair, service & install
Gas Safe Boiler Engineer in the UK
Gas Safe boiler engineer in the UK for service, repair and installation of domestic and light-commercial boilers — combi, system and conventional. Worcester, Vaillant, Ideal, Baxi and more.
- Boiler service, repair & install
- Combi, system & conventional boilers
- All major brands supported
Gas Safe Heating Engineer in the UK
Gas Safe registered heating engineer in the UK — central heating installs, power-flushes, radiator replacements, smart controls and full system upgrades for homes and commercial premises.
- Full central heating design & install
- Power-flush & system clean
- Smart thermostats & zone controls
Gas Safe Plumbers in the UK
Gas Safe registered plumbers in the UK for any job that combines gas and water — boilers, hot water cylinders, gas cookers, leak repairs and plumbing emergencies.
- Gas + water specialists
- Leak detection & repair
- Hot water cylinder & unvented work
Gas Safe Installers in the UK
Gas Safe registered installers in the UK for boilers, cookers, hobs, fires and full heating systems — domestic and commercial. Notified to Gas Safe and certified on completion.
- Notified installations (Gas Safe / Building Regs)
- Boiler, cooker, hob & fire installs
- Full system upgrades
Gas Safe London in the UK
Gas Safe registered engineers across London — covering all 32 boroughs and the City. Commercial and domestic gas, boilers, heating and certificates with same-day availability.
- All London boroughs covered
- Same-day London-wide response
- Commercial & domestic engineers
Gas Safe Registered Engineer in the UK
Gas Safe Registered engineer in the UK — fully qualified, ID-carded and listed on the Gas Safe Register for any natural gas or LPG work in your home or business.
- Verified on the Gas Safe Register
- ID card available on request
- Domestic & commercial qualifications
Gas Safe Registered Heating Engineers — Central London in the UK
Gas Safe registered heating engineers covering Central London — Westminster, City, Mayfair, Soho, Marylebone, Kensington and Chelsea. Boilers, heating systems and emergency response.
- Central London priority response
- Heating system design & repair
- Listed building & period property experience
Gas Safe Registered Boiler Services in the UK
Annual boiler service by Gas Safe registered engineers in the UK — combustion check, safety device test and full service report. Keeps warranty valid and bills lower.
- Manufacturer-spec annual service
- Flue gas analysis report
- All boiler brands supported
Commercial Gas Fitter in the UK
Commercial gas fitter in the UK — pipework, meter alterations, appliance connections and full kitchen/plant room fit-outs to IGEM and BS standards.
- Steel, copper & TracPipe pipework
- Meter alterations & upgrades
- Catering & plant room fit-outs
Gas Safe Registered Plumber in the UK
Gas Safe registered plumber in the UK — verified on the Gas Safe Register for any job that combines gas and water: boilers, hot water cylinders, gas cookers, leak repair and unvented systems.
- Verified on the Gas Safe Register
- Combined gas + water specialists
- Hot water, leak & cylinder work
Independent Gas Safe Engineer in the UK
Independent Gas Safe registered engineer in the UK — no call-centres, no franchise mark-ups. Direct booking with the engineer who turns up, for boilers, heating, plumbing and certificates.
- Talk direct to the engineer
- No franchise or call-centre fees
- Honest, fixed-price quotes
LPG Gas Safe Registered Engineer in the UK
LPG Gas Safe registered engineer in the UK — qualified for LPG boilers, cookers, heaters and pipework on properties off the mains gas network, plus mobile catering and leisure use.
- LPG-qualified Gas Safe ticket
- Off-grid homes & rural properties
- Mobile catering & leisure (CP44 / CP2)
Find a Gas Safe Engineer in the UK
Find a Gas Safe registered engineer in the UK — fast match with a verified, ID-carded engineer for boilers, heating, plumbing, gas certificates and emergency callouts.
- Verified on the Gas Safe Register
- Same-day & next-day availability
- Domestic & commercial engineers
CP12 Landlord Gas Safety Certificate in the UK
CP12 landlord gas safety certificate in the UK — the annual gas safety record every rental property needs by law, issued same-day by Gas Safe registered engineers.
- Annual CP12 landlord gas safety record
- All gas appliances & pipework tested
- Certificate emailed same day
Boiler Service & Gas Safety Certificate in the UK
Combined annual boiler service and landlord gas safety certificate in the UK — one Gas Safe registered engineer, one visit, one fixed price, certificate issued same day.
- Full boiler service + CP12 in one visit
- Manufacturer warranty maintained
- One engineer, one fixed price
Air Conditioning Installation in the UK
Air conditioning installation in the UK — split, multi-split, VRF and cassette systems for homes, offices, shops and commercial premises. F-Gas certified, fully insured and building-regs compliant.
- Split, multi-split, VRF & cassette systems
- F-Gas certified engineers
- Free on-site survey & fixed quote
Air Conditioning Installers in the UK
Air conditioning installers in the UK — F-Gas certified engineers installing wall-splits, multi-splits, cassettes, ducted and VRF systems for domestic and commercial clients.
- F-Gas Category I certified installers
- Domestic & commercial installs
- £5m public liability insurance
Air Conditioning Contractors in the UK
Air conditioning contractors in the UK — design, supply, install and maintain commercial cooling systems for offices, retail, hospitality, data rooms and industrial premises. REFCOM F-Gas registered.
- REFCOM F-Gas registered company
- Design & build contracts
- Planned preventive maintenance
Commercial Air Conditioning Installation in the UK
Commercial air conditioning installation in the UK — VRF, VRV, ducted, cassette and split systems for offices, retail, restaurants, hotels, gyms and server rooms. REFCOM F-Gas registered, CDM 2015 compliant.
- VRF / VRV, ducted & cassette systems
- Offices, retail, hospitality & server rooms
- Out-of-hours & phased installs
Commercial Air Conditioning Supply & Design in the UK
Commercial air conditioning equipment supply and system design in the UK — CIBSE heat-load calculations, ductwork design, VRF/VRV and split system specification for offices, retail and hospitality. REFCOM F-Gas registered.
- Equipment supply — all major brands
- CIBSE heat-load & ductwork design
- VRF / VRV & split system specification
Gas Meter Outlet Connection in the UK
Gas meter outlet connection in the UK — safe connection of your installation pipework to the meter outlet, leak-tested and commissioned by Gas Safe registered engineers.
- Meter outlet & ECV connection
- Full tightness test included
- Domestic & commercial meters
Gas Meter Relocation Pipework in the UK
Gas meter relocation pipework in the UK — rerouting and extending installation pipework when your gas meter moves, fully tested and recommissioned by Gas Safe engineers.
- Pipework alterations for meter moves
- Coordinated with your supplier/DNO
- Tightness tested & purged
Gas Appliance Recommissioning in the UK
Gas appliance recommissioning in the UK — safe return to service of boilers, cookers and commercial appliances after works or shutdown, with full combustion checks.
- Post-works recommissioning
- Combustion & flue checks
- Domestic & commercial appliances
Gas Appliance Disconnection in the UK
Gas appliance disconnection in the UK — safe isolation, disconnection and capping-off of gas appliances for removal, replacement or refurbishment works.
- Safe isolation & cap-off
- Cookers, boilers & commercial appliances
- Tightness test after disconnection
Gas Appliance Relocation in the UK
Gas appliance relocation in the UK — moving boilers, cookers and commercial gas appliances with new pipework, flue alterations and full recommissioning.
- Appliance moves within premises
- New pipework & flue alterations
- Full recommissioning included
Gas Pipework Modification in the UK
Gas pipework modification in the UK — alterations, extensions and rerouting of gas installation pipework for refurbishments, layout changes and new appliances.
- Pipework extensions & rerouting
- Copper & steel installations
- Sizing checked to BS 6891 / IGE/UP/2
Gas Leak Investigation in the UK
Gas leak investigation in the UK — urgent trace and repair of gas escapes using electronic detection and pressure testing by Gas Safe registered engineers.
- Rapid emergency response
- Electronic leak detection
- Trace, repair & retest
Gas Tightness Test in the UK
Gas tightness testing in the UK — formal strength and tightness testing of gas installations to IGE/UP/1 & BS 6891 for handover, insurance and safety compliance.
- IGE/UP/1 & BS 6891 compliant
- Commercial & domestic systems
- Digital test equipment
Gas Pipework Purge in the UK
Gas pipework purging in the UK — safe purging of new and existing gas installations to IGE/UP/1 before commissioning or after works, with certification.
- Purge to IGE/UP/1 standard
- New installs & post-works purging
- Commercial pipework specialists
Gas Emergency Control Valve Replacement in the UK
Emergency control valve (ECV) replacement in the UK — replacement of faulty or seized meter control valves, coordinated with the gas transporter where required.
- ECV replacement & testing
- Transporter coordination handled
- Tightness test included
Gas Isolation Valve Replacement in the UK
Gas isolation valve replacement in the UK — replacement of appliance and pipework isolation valves that leak, seize or fail to shut off safely.
- Appliance & line valves replaced
- Gas-rated valves only
- Tested after replacement
Gas Solenoid Valve Replacement in the UK
Gas solenoid valve replacement in the UK — replacement of faulty safety shut-off solenoid valves on commercial catering and plant room gas systems.
- Commercial safety shut-off valves
- Catering & plant room systems
- Interlock testing included
Gas Pressure Test in the UK
Gas pressure testing in the UK — measurement of standing, working and burner pressures to verify safe, efficient operation of your gas installation.
- Standing & working pressure checks
- Digital manometer readings
- Fault diagnosis included
Gas Working-Pressure Investigation in the UK
Gas working-pressure investigation in the UK — diagnosing low or unstable gas pressure at appliances, from meter outlet through to burner.
- Low-pressure fault finding
- Meter-to-burner diagnosis
- Regulator & governor checks
Gas Pipe Sizing Investigation in the UK
Gas pipe sizing investigation in the UK — verification that existing pipework is correctly sized for connected appliance loads to BS 6891 / IGE/UP/2.
- Load & sizing calculations
- BS 6891 / IGE/UP/2 compliance
- Under-sized pipework identified
Gas Pressure-Drop Investigation in the UK
Gas pressure-drop investigation in the UK — locating restrictions, undersized pipework and faulty regulators causing pressure loss across your installation.
- Section-by-section pressure mapping
- Restriction & regulator faults found
- Appliance performance restored
Flue Integrity Inspection in the UK
Flue integrity inspection in the UK — visual and flue-flow testing of appliance flues and chimneys to confirm safe removal of combustion products.
- Flue flow & spillage testing
- Visual integrity survey
- Open & room-sealed flues
Commercial Flue Investigation in the UK
Commercial flue investigation in the UK — inspection and testing of commercial boiler, plant room and catering flue systems for safety and compliance.
- Plant room & catering flues
- Draught & dilution checks
- Shared flue & riser surveys
Gas Appliance Ventilation Assessment in the UK
Gas appliance ventilation assessment in the UK — checking combustion air and room ventilation meets BS 5440 / BS 6644 requirements for your appliances.
- BS 5440 / BS 6644 compliance
- Combustion air calculations
- Catering & plant room ventilation
Gas Appliance Combustion Analysis in the UK
Gas appliance combustion analysis in the UK — flue gas analysis of boilers and commercial appliances to verify safe, efficient combustion and correct CO/CO₂ ratios.
- Electronic flue gas analysis
- CO/CO₂ ratio checks
- Efficiency readings
Unsafe Gas Appliance Investigation in the UK
Unsafe gas appliance investigation in the UK — expert assessment of appliances flagged as Immediately Dangerous or At Risk, with clear remedial options.
- ID & AR classification explained
- Full appliance safety assessment
- Repair vs replace guidance
Gas Warning Notice Remedial Works in the UK
Gas warning notice remedial works in the UK — completing the repairs needed to clear Warning/Advice notices and safely return your appliance to service.
- ID/AR notice defects rectified
- All remedial gas works
- Re-test & recommission
Gas Installation Recommissioning in the UK
Gas installation recommissioning in the UK — full recommissioning of gas installations after shutdown, refurbishment or void periods, including tightness testing.
- Whole-installation recommissioning
- Tightness test & purge
- Appliance-by-appliance checks
Commercial Gas Meter Connection in the UK
Commercial gas meter connection in the UK — connecting commercial and industrial meter installations to site pipework, tested and commissioned to IGE/UP standards.
- Commercial & industrial meters
- Regulator & governor setup
- IGE/UP compliant testing
Gas Manifold Installation in the UK
Gas manifold installation in the UK — design and installation of multi-appliance gas manifolds with individual isolation for commercial kitchens and plant rooms.
- Multi-appliance manifolds
- Individual appliance isolation
- Commercial kitchens & plant rooms
Gas Manifold Repair in the UK
Gas manifold repair in the UK — repair of leaking joints, faulty valves and damaged sections on commercial gas manifolds, restoring safe operation fast.
- Leak & valve repairs
- Commercial kitchen manifolds
- Tightness tested after repair
CP15 Certificate FAQs
What is a CP15 certificate?
Commercial Plant Commissioning Certificate (CP15) — issued by a Gas Safe registered commercial engineer after the appliances, pipework and ventilation covered by the certificate have been inspected and tested.
How much does a CP15 certificate cost?
Pricing starts at £150 + VAT for the first appliance, with £25 + VAT for each additional appliance inspected on the same visit. You get a fixed written quote before we attend — call 07427 826446.
How long is a CP15 certificate valid for?
Twelve months from the date of inspection. We send a renewal reminder before it expires so your premises never trades without valid documentation.
How quickly can you issue the certificate?
Same-day and next-day appointments are available seven days a week, and the certificate is issued by email on the day of the inspection once the installation passes.
Ready to Book Your CP15 Certificate?
Secure your certificate today. Our Gas Safe registered engineers are available seven days a week with same-day service as standard.
Starting from £150 + VAT for 1 appliance • Same-day service available