A Gas Safety Certificate proves that gas appliances and pipework in your home have been professionally inspected and are safe. For landlords, it's legally required. For homeowners, it's essential insurance against leaks and hazards.
What Is It?
A Gas Safety Certificate (also called a CP12) is an official document issued by a Gas Safe registered engineer after completing a safety inspection. It confirms that:
- Gas appliances (boiler, hob, cooker, fire) are in good working order
- Gas pipework is secure and not leaking
- Ventilation is adequate
- There is no dangerous carbon monoxide risk
Who Needs One?
Landlords (MANDATORY)
UK law requires landlords to:
- Obtain an annual Gas Safety Certificate for every rental property
- Provide a copy to tenants within 30 days of the inspection
- Keep copies for 2 years
- Conduct the inspection before a new tenant moves in
Failing to do so: Fines up to £6,000 per property, or unlimited in serious cases. You could also face prosecution and removal from the rental register.
Homeowners (not mandatory, but recommended)
- No legal requirement
- Highly recommended every 1–2 years for safety
- Required if selling to a mortgage lender
- Some home insurance policies require it
Tenants (your right)
- You have the right to request a Gas Safety Certificate from your landlord
- Landlords must provide it within reasonable timeframe
- If they refuse, contact the local authority or housing association
What Gets Inspected?
Gas appliances
- Boiler (heating efficiency, seals, combustion)
- Gas hob/cooker (burner function, safety devices)
- Gas fire (including solid fuel if connected to flue)
- Warm air heaters
- Water heater (if gas-powered)
Gas supply & pipework
- Gas meter condition
- Pipework for leaks and corrosion
- Connections to appliances
Ventilation & flues
- Room ventilation (adequate air supply)
- Flue condition (exhaust pipes)
- Terminal position (where flue exits building)
Carbon monoxide risk
- CO detector present (recommended)
- No signs of carbon monoxide risk
What the Certificate Includes
Your Gas Safety Certificate will show:
- Inspection date and when it expires (12 months)
- Property address
- Engineer's name and Gas Safe ID number
- List of all gas appliances inspected
- Test results for each appliance (pass/fail/not tested)
- Status: Safe or Unsafe
- Any defects found and recommendations
How Often Do You Need One?
Landlords
- Mandatory: Every 12 months (annually)
- Before new tenants move in: Within the previous 12 months
Homeowners
- Recommended: Every 1–2 years
- After boiler installation: Mandatory (included in installation)
- If selling with a mortgage: Required by lender
Cost
- Standard inspection: £50–120
- Typical cost: £80–100 for most homes
- Larger properties (more appliances): £120–180
Landlords: This is a mandatory business expense and can be deducted against tax.
What If Defects Are Found?
Safe (nothing wrong)
Certificate is valid for 12 months.
Unsafe or At Risk
The engineer will flag defects. Landlords must:
- Immediately: Tell the tenant of any unsafe appliance
- Repair within 7 days of the defect being notified
- For dangerous conditions: Immediately isolate the appliance
Example defects: Gas leak, broken burner, faulty safety valve, cracked flue - all must be fixed promptly.
Not Safe to Test (NSTQ)
The engineer can't test the appliance because:
- It's dangerous (immediate isolation required)
- Access is blocked
- It's not functioning
These must be repaired before the property is safe to occupy.
How to Arrange One
- Contact a Gas Safe registered engineer (search gasplumbingsafety.co.uk)
- Book an appointment (usually same week)
- Ensure all appliances are accessible
- Engineer conducts inspection (30–60 minutes typical)
- You receive the certificate immediately (if pass) or action required (if fail)
Gas Safe Registration: Why It Matters
Only Gas Safe registered engineers are qualified and legally permitted to:
- Inspect gas appliances and pipework
- Issue Gas Safety Certificates
- Install or repair gas appliances
Always check the engineer's ID before work begins. You can verify registration at gasplumbingsafety.co.uk
Landlord Responsibilities Summary
| Responsibility | Deadline |
|---|---|
| Arrange annual Gas Safety Certificate | Within 12 months of last inspection |
| Provide copy to tenant | Within 30 days of inspection |
| Fix unsafe appliances | Within 7 days of discovery |
| Keep certificate copies | For 2 years minimum |
Need Your Gas Safety Certificate?
Gas Safe registered engineers. Quick appointments, same-week availability for landlords.
Book Now: 02476 950 595Key Takeaways
- A Gas Safety Certificate proves your gas appliances are safe
- Landlords must get one annually - it's a legal requirement
- Cost is £50–120, a small investment for safety and compliance
- Homeowners should get one every 1–2 years for safety
- Only Gas Safe registered engineers can issue them
- Defects must be fixed within 7 days