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EICR codes explained in plain English

The point is not just receiving codes, but understanding what they mean for the property.

Written and checked by Willesden Smart Homes. Last reviewed August 2026.

Send report photos + postcode EICR page

We serve homes across NW London after checking the postcode and the job. See the Areas page .

This guide is for reading the codes in an EICR without turning them into guesswork. The aim is to understand what the report is flagging, what may need attention first, and what should be checked before any remedial scope is agreed.

Quick answer: C1, C2 and FI make a report unsatisfactory. C3 means improvement recommended and does not, on its own, make the report unsatisfactory.

What the codes help decide

  • What the report is actually flagging, in plain English rather than just the code label.
  • Whether the next step is urgent safety action, further investigation, improvement work, or a calmer planned repair.
  • Which report pages, board photos or affected points would help confirm the sensible next step.

What can change the next step

  • Hidden damage, poor previous work, unclear circuit details or access constraints can change the scope.
  • The final outcome still depends on what is confirmed on site or in the report.
Official sources and further guidance

Need help understanding an EICR code?

Send the report page, your postcode, property type and any photos that help show the board or affected circuit. I’ll explain the likely next step clearly.

Send report details EICR page