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Residential & Commercial Gas Safety Certificates & More
We provide a complete range of property safety certificates and compliance services across London and the M25, including Gas Safety Certificates (CP12), Electrical Safety Certificates (EICR), EPC Certificates, PAT Testing, Fire Alarm Certificates, Emergency Lighting Certificates, Fire Risk Assessments and Fire Door Surveys. Our qualified and experienced engineers provide reliable, professional services for landlords, homeowners, estate agents, rental properties, and property buyers and sellers, with competitive prices and fast appointments.
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How Gas Safety Inspection Is Performed
A Gas Safety Inspection (CP12) is a structured process carried out by a qualified Gas Safe registered engineer to ensure all gas appliances and installations in a property are safe to use. Here’s how it’s typically performed step by step:
Initial Visual Inspection
The engineer begins with a visual check of:
- Boiler, gas hob, and other appliances
- Pipework condition and connections
- Signs of corrosion, leaks, or damage
- Proper installation and positioning
This step ensures everything looks safe before testing begins.
Appliance Safety Checks
Each gas appliance is tested individually:
- Flame color and stability (should be blue and steady)
- Burner pressure and heat input
- Safety devices (flame failure device, thermostats)
Ensures appliances are burning gas efficiently and safely.
Flue & Ventilation Inspection
The engineer checks:
- Flue system (removes harmful gases like CO)
- Proper ventilation (air supply for combustion)
- No blockages or leaks
Critical to prevent carbon monoxide poisoning.
Gas Tightness Test
A pressure test is done at the gas meter:
- Checks for any gas leaks in the system
- Uses specialist equipment (manometer)
Even small leaks can be dangerous, so this is essential.
Safety Device & Pipework Check
The engineer verifies:
- Emergency control valve accessibility
- Pipework is properly secured and protected
- (Where applicable) bonding/earthing
Ensures safe operation and emergency shutdown capability.
Issuing the Gas Safety Certificate (CP12)
After inspection:
- A Gas Safety Certificate (CP12) is issued
- Lists all appliances checked
- Shows pass/fail status and any defects
Required annually for landlords under UK law.
