CP42 Certificate: What It Is and Why Your Commercial Kitchen Needs One

If you operate a commercial kitchen, you’re legally required to hold a valid CP42 gas safety certificate.
This certificate confirms that all gas appliances, pipework, and extraction systems in your kitchen have been inspected and tested by a Gas Safe registered engineer.

Whether you need a restaurant gas safety certificate, café, school, or catering business, your CP42 proves compliance with Gas Safety (Installation and Use) Regulations 1998 — and helps protect staff, customers, and your premises from serious risks.

What Is a CP42 Gas Safety Certificate?

A CP42 certificate (sometimes called a Commercial Catering Gas Safety Certificate) is issued after a qualified Gas Safe commercial catering engineer inspects and tests your entire gas installation.

During the inspection, the engineer checks that:

• All gas appliances are correctly installed and safe to operate.

• Ventilation and extraction systems meet legal standards.

• Gas interlock systems work correctly to shut off gas if ventilation fails.

• Pipework, valves, and hoses are secure, undamaged, and leak-free.

• Emergency controls are accessible and clearly marked.

Once passed, you’ll receive a signed CP42 certificate — valid for 12 months — confirming your kitchen complies with current gas safety regulations.

What Could Cause You to Fail a CP42 Inspection?

Even well-maintained kitchens can fail a CP42 gas safety check if certain issues are found.
Here are some of the most common reasons for failure and the remedial works often required:

1. Poor or Inadequate Ventilation

Blocked filters, failed extraction fans, or missing canopy sections can stop fumes and heat from venting properly.

• Remedy: Clean or replace filters, repair extraction fans, or upgrade to meet airflow requirements.
  

2. Faulty or Missing Gas Interlock System

Modern commercial kitchens must have an interlock system that automatically cuts the gas supply if ventilation stops.

• Remedy: Install or repair the gas interlock system before reinspection.
  

3. Gas Leaks or Damaged Pipework

Leaks or corroded pipes are immediate safety hazards and will result in a failed inspection.

• Remedy: Isolate the gas supply, repair or replace affected pipework, and retest for tightness.
  

4. Unsuitable Flexible Hoses or Connections

Using non-approved or perished hoses can lead to leaks or bursts under pressure.

• Remedy: Replace hoses with approved catering-grade flexible connections.
  

5. Faulty Appliances or Incomplete Servicing

If appliances haven’t been maintained or serviced, they may fail performance and safety checks.

• Remedy: Arrange professional servicing or repairs (e.g. burner cleaning, thermostat or ignition replacements).
  

6. Inaccessible Emergency Isolation Valves

Gas shut-off valves must be clearly identified and easy to reach.

• Remedy: Reposition valves or install signage to meet regulations.
  

7. Incomplete or Missing Safety Documentation

Lack of appliance service records or previous safety certificates can also lead to a failed inspection.

• Remedy: Keep a complete service history and certificates on site for future audits.
  

Why a CP42 Certificate Matters

• Legal Compliance: A valid CP42 is a legal requirement for all commercial kitchens using gas appliances.

• Insurance Protection: Most insurers require proof of a current certificate before providing cover.

• Safety Assurance: Regular checks prevent gas leaks, carbon monoxide build-up, and fire risks.

• Business Continuity: Passing first time means no costly downtime or enforcement action.
  

How Often Should You Renew It?

Your CP42 certificate must be renewed every 12 months.
Many businesses combine their annual CP42 inspection with appliance servicing to stay compliant and minimise disruption.

Book Your CP42 Gas Safety Inspection

Our certified Gas Safe commercial catering engineers carry out CP42 gas safety inspections and issue certificates across London, Essex, and Kent.

We check all appliances, interlocks, ventilation, and pipework — and provide clear advice or remedial works if upgrades are required to help you pass safely.

Call us today to arrange your CP42 gas safety check and keep your kitchen fully compliant and safe.