EICR C2 and Unnecessary Consumer Unit Replacements: How to Protect Yourself

A landlord on the LandlordZONE forum reported receiving a C2 observation because the consumer unit in a six-bedroom HMO lacked Arc Fault Detection Devices. The quote for a new board: £930. Forum members with electrical industry experience pointed out that AFDDs on an existing installation are an 18th Edition recommendation — a C3, not a C2 — because BS 7671 wiring standards do not apply retrospectively.

This is one of the most expensive traps in landlord electrical compliance.

How the Upsell Works

The electrician carries out the EICR and codes a missing modern feature — AFDDs, surge protection, or a plastic consumer unit enclosure — as C2 (Potentially Dangerous) rather than C3 (Improvement Recommended). A C2 makes the report unsatisfactory and triggers a mandatory 28-day repair deadline. The landlord, under time pressure and unfamiliar with the coding system, approves the work.

A consumer unit replacement runs between £450 and £900 depending on circuit count and location. That is real money for something that may not be legally required.

When a C2 Is Legitimate

A genuine C2 reflects a condition that could become dangerous under fault conditions. Missing RCD protection on socket circuits that should have it, evidence of thermal damage, circuits with loose connections or inadequate fault paths — these are real safety issues that need fixing.

The test is whether the observation relates to a defect in the existing installation or to the absence of a feature that was not part of the original design. An installation that was compliant when fitted does not fail simply because a new BS 7671 amendment added a requirement that did not previously exist.

How to Challenge a Suspect C2

Get a second opinion. Ask another inspector — registered with NICEIC, NAPIT, or the Registered Competent Person Electrical scheme — to review the report. A report review typically costs £50–£100 and takes less time than a full inspection because the reviewer is evaluating the existing findings, not re-testing every circuit.

If the C2 finding is corrected to C3, a report with only C3 observations is satisfactory under SI 2020/312 and the C3 itself does not require remedial work.

If they confirm the C2, at least you know the work is genuinely necessary — and you can compare quotes with confidence.

Protecting Yourself Before the Inspection

Get a written quote before booking that specifies what the inspection fee covers and whether remedial work is a separate charge. Ask the inspector upfront whether they typically separate the inspection from any follow-on work, or whether the same person does both. Separating the two removes the financial incentive to code observations aggressively.

The Electrical Safety (EICR) Compliance Guide includes a contractor vetting checklist and a code action map that helps you distinguish genuine C2 defects from advisory items that should be C3.

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