EICR Failed Due to Missing Gas Bonding (C2 Fault Explained with Real London Example – 2025 Guide)

EICR Certificate

27 October 2025

EICR Faults & Failures

EICR Failed Due to Missing Gas Bonding

Has your EICR report failed because of missing gas bonding?
You’re not alone it’s one of the top C2 faults flagged by electricians across London. Whether you own a rental flat in Canary Wharf or a Victorian terrace in Fulham, this small oversight can stop your Electrical Installation Condition Report (EICR) from passing.

In this 2025 guide, we explain exactly what a C2 gas bonding fault means, why it happens, how to fix it, and how to get your certificate reissued.
We’ll also show you how this issue links to other common EICR failures landlords and homeowners face every day.

👉 For full context, see our EICR Services in London and learn how our team helps hundreds of properties pass safely each month.

Real London Example – EICR Failed Due to Missing Gas Bonding

During one of our recent inspections, a landlord’s report included this note:

C2 – No independence 10mm bonding cable to gas meter.

That single line caused the entire EICR to be marked as “unsatisfactory.”
The property’s water bonding was in place, but the gas pipe had no bonding conductor connecting it to the main earth terminal at the consumer unit.

In practical terms, this meant that if an electrical fault occurred on a nearby appliance, the metal gas pipe could become live presenting a serious risk of electric shock.

This kind of fault is extremely common and often discovered during routine EICR testing in London.

💡 See other examples in our related post: Most Common EICR Failures in London (2025 Guide)

What Is Gas Bonding and Why It’s Important

Gas bonding (or main protective bonding) links your gas pipework to your electrical system’s main earth terminal using a 10 mm² copper cable.
This equalizes potential differences between conductive materials in your property, ensuring that in the event of a fault, current flows safely to earth not through you.

Without it:

Your gas pipes could become live during a fault.
A small shock could escalate into serious injury.
Your insurance or compliance documents could be invalidated.

This requirement comes directly from BS 7671 (IET Wiring Regulations) and applies to all UK properties.

For a deeper understanding of bonding and how it’s checked, visit:
👉 How to Read and Understand an EICR Report

Why Missing Gas Bonding Is a C2 Fault

A C2 fault means “potentially dangerous urgent remedial action required.”
It’s not immediately life-threatening (like a C1), but it does present a real risk if another fault occurs.

Under Regulation 411.3.1.2 of BS 7671, all metal parts that could introduce earth potential including gas pipes must be bonded to the main earth terminal.
When missing, your EICR will automatically fail and be labeled as “unsatisfactory.”

This fault commonly appears alongside other C2 issues like:

No RCD protection on sockets or lighting circuits
Missing SPD (Surge Protective Device)
Non-IP rated bathroom lights
Broken sockets or exposed conductors

See full examples in our guide:
👉 EICR Certificate Cost Explained: What to Expect in London 2025

How to Fix Missing Gas Bonding (Step-by-Step)

Repairing a missing bonding connection is simple but must be done by a qualified electrician.

Assessment: Identify where the gas meter is located and check for a connection to the main earthing terminal.
Cable Route Planning: Run a 10mm² green/yellow bonding cable from the gas meter to the consumer unit.
Installation: Attach a BS951 bonding clamp before the flexible pipe section, clearly labeled “Safety Electrical Connection – Do Not Remove.”
Testing: Verify continuity between gas pipe and main earth terminal.
Certification: Re-issue an updated satisfactory EICR.

You can learn more about this process on our EICR Remedial Work page.

How Much Does It Cost to Fix Missing Gas Bonding in London?

In most London homes, repairing missing bonding costs between £80 and £150, depending on access.
This includes:

10mm bonding cable
Bonding clamp and label
Continuity test and reissue of report

Combine this fix with your EICR visit to save time and money learn more in our EICR Certificate Cost Guide.

Landlord and Homeowner Obligations

For landlords, this issue is more than just a technical failure it’s a legal compliance matter.

Under the Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020, landlords must ensure:

A valid EICR certificate every 5 years.
Any C1 or C2 faults are rectified within 28 days.
Proof of repair and a satisfactory report are provided to tenants and local authorities.

See details at:
👉 EICR Certificates for Landlords in London

Homeowners also benefit from periodic testing to maintain property safety and insurance validity:
👉 EICR Certificates for Homeowners

Preventing Future EICR Failures

Avoid bonding faults and other C2 issues by following these steps:

Schedule periodic EICR testing every 5 years.
Check visible bonding at gas and water meters.
Hire only NICEIC-approved electricians from trusted providers.
Book combined testing (EICR + PAT) for complete coverage.

Our team handles all of this through our EICR Services ensuring your property remains compliant and safe.

Conclusion

Missing gas bonding is one of the most common EICR failures in London, yet one of the easiest to fix.
By understanding what it means and acting quickly, you’ll protect your property, tenants, and electrical safety compliance.

Stay proactive schedule your inspection today with
👉 London EICR Certificates your trusted partner for safe, compliant, and fully insured EICR inspections across London.

Frequently Asked Questions About Missing Gas Bonding and EICR Failures

1️⃣Why does my EICR report say “No bonding to gas meter”?

This means your gas pipework isn’t connected to the main electrical earth using a 10mm green/yellow bonding cable. Without this, your gas pipe could become live during an electrical fault, so your EICR fails with a C2 classification. You can learn how electricians fix this issue here: 👉 EICR Remedial Work for Failed Certificates

2️⃣Is missing gas bonding an automatic EICR fail?

Yes. Missing gas bonding is a C2 fault, which automatically makes your EICR “unsatisfactory.” You’ll need to correct it and have the installation retested to get a valid EICR certificate.

3️⃣How much does it cost to install gas bonding in London?

On average, adding or repairing gas bonding costs between £80 and £150, depending on access. It’s one of the most affordable EICR remedial works. Check our full price breakdown: 👉 EICR Certificate Cost Guide

4️⃣What size cable should be used for gas bonding?

UK regulations require a 10mm² green/yellow copper bonding cable for gas and water pipes, connected using a BS951 clamp and labeled “Safety Electrical Connection – Do Not Remove.”

5️⃣My gas meter is outside do I still need bonding?

Yes. The bonding connection must be made inside your property, on the consumer side of the gas meter, before the first branch in the pipework.

6️⃣Can I fix gas bonding myself?

No gas bonding must be installed and tested by a qualified electrician. Incorrect bonding can be dangerous and will still fail your next EICR inspection.

7️⃣ What happens after I fix missing gas bonding?

Once your electrician installs proper gas bonding, they’ll retest continuity and issue an updated EICR report marked “satisfactory.” 👉 You can book this service through our EICR Services page.

8️⃣ Will my landlord insurance be affected by failed gas bonding?

Yes, potentially. Many insurers require proof of a satisfactory EICR for rental properties. If your report shows a C2 fault, you may need to fix it before your policy remains valid.

9️⃣ How can landlords prevent bonding faults in the future?

Schedule a pre-EICR inspection or visual check every few years. Our team can identify bonding and earthing issues early to ensure you pass your next inspection.

🔟What other faults commonly appear with missing gas bonding?

It’s often found alongside: No RCD protection on sockets No SPD installed in the consumer unit Broken or loose sockets Non-IP-rated bathroom lights Read more about these in our article: 👉 Most Common EICR Failures in London (2025 Guide)

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