What does C1, C2 and C3 mean on an EICR? Plain-English guide for landlords and homebuyers
Short answer: On an EICR (Electrical Installation Condition Report), C1 means “Danger present — risk of injury, immediate action required.” C2 means “Potentially dangerous — urgent remedial work required.” C3 means “Improvement recommended” and does not make the report unsatisfactory on its own. FI means “Further investigation required” and does make the report unsatisfactory. A report is only “satisfactory” if there are no C1, C2 or FI findings.
If you’re a landlord in London with a C1 or C2 on your EICR, you need to fix the issue and reissue the certificate within 28 days. If you’re a homebuyer who’s just been sent an EICR with C1 or C2 findings, you can usually push the seller to remedy before exchange, or negotiate a price reduction. This guide explains exactly what each code means, what it typically costs to fix, and what your options are.
EICR coding system at a glance
| Code | Meaning | Pass or fail? | Action |
|---|---|---|---|
| C1 | Danger present | FAIL | Make safe immediately — sometimes on the spot during inspection |
| C2 | Potentially dangerous | FAIL | Remedy required to issue satisfactory report |
| C3 | Improvement recommended | PASS | Optional — improves safety but not required |
| FI | Further investigation needed | FAIL | Re-inspect specific items to determine code |
C1: Danger present — what it actually means
A C1 finding is something that could cause immediate injury or death. Examples we see regularly in London properties:
- Bare conductors exposed (a damaged cable with live copper visible)
- Broken socket with no faceplate, exposing terminals
- Missing covers on consumer unit or junction box
- Live parts accessible behind broken light switch
- Earthing conductor disconnected at the main earth terminal
- Class I appliance with damaged earth pin or no earth connection
An electrician finding a C1 should make the circuit safe on the spot — usually by isolating power to that part of the system — before completing the inspection. A C1 does not mean the whole property is unsafe to occupy. It usually means one specific item must be fixed within hours to days.
Typical cost to remedy C1: £50–£250 inc VAT depending on the fault. A broken socket replacement might be £85. A missing junction-box cover refit might be £50. A loose earth tail re-termination might be £120.
C2: Potentially dangerous — the most common reason for unsatisfactory EICRs
C2 is the workhorse failure code on London EICRs. The condition isn’t currently causing injury, but it could under foreseeable circumstances. Common C2 findings in pre-2000 London properties:
- No RCD protection on socket circuits — required since 2008. Almost every consumer unit installed before 2008 fails this.
- No supplementary bonding in bathroom — required to bond exposed metalwork to earth.
- No earth on lighting circuit — common in 1960s/70s rewires that didn’t carry the earth conductor through.
- Wylex/MEM rewireable fuses — pre-1992 consumer units without RCD protection on final circuits.
- Damaged cable sheathing — old TRS or PVC cables degraded over time, especially where they pass over joists.
- Loose tails at consumer unit — main supply tails not properly tightened, risk of overheating.
- Sockets on kitchen worktop without RCD — high-risk location, must have additional protection.
- Plastic consumer unit in escape route — under amendment 3 of the 17th edition, all CUs must be in non-combustible enclosure (metal).
Typical cost to remedy C2: ranges hugely:
- Single bonding refit in bathroom: £85–£150
- Earth pull-in on lighting circuit (per circuit): £120–£250
- Tails replacement at CU: £150–£300
- Full consumer unit replacement: £550–£950 inc VAT (the most common fix for multi-C2 reports)
If you have 3+ C2 items on the same consumer unit, almost always the cheapest solution is to fit a new modern dual-RCD or RCBO board, which clears most of the C2s in one job.
C3: Improvement recommended — does NOT make the report unsatisfactory
C3 is for items that comply with the regulations that were in force when the installation was done, but don’t meet today’s standards. Common C3 findings:
- Old colour wiring (red/black instead of brown/blue) — fine if undamaged
- Surface-mounted plastic conduit where flush would be tidier
- Mixed cable types in same run (T&E and singles)
- Older Wylex MCB consumer unit that still has RCD protection
- Lack of arc fault detection device (AFDD) — only mandatory in some commercial settings
You do not need to fix C3 items to make your EICR satisfactory. But many landlords budget for them at the next rewire or board change so the property is future-proofed.
FI: Further investigation — the underrated fail code
FI (“further investigation required”) is given when the inspector cannot determine whether something is C1, C2 or C3 within the time allowed for the EICR. Common FI scenarios:
- Hidden junction box — needs floorboard lifted to inspect
- Cable behind plasterboard — needs intrusive inspection
- Underground cable to outbuilding — needs ground-penetrating test
- Suspected damp ingress in cable trunking — needs sampling
FI fails the EICR. You need to commission the further investigation (typically £150–£400) and then either remedy or sign off the item before a satisfactory report can be issued.
How EICRs work in London — landlord and conveyancing context
Three scenarios where EICR coding matters most:
1. Landlord renting a property in London
Under the Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020, you need a satisfactory EICR every 5 years (annually for licensed HMOs). If your EICR comes back unsatisfactory because of C1, C2 or FI items, you have 28 days to either complete the remedial work or formally arrange for it — then you must give the certified satisfactory report to your tenant within 28 days of completion.
Failure to comply can result in fines of up to £30,000. Hackney, Tower Hamlets and Southwark are particularly active enforcement boroughs.
2. Buying a property in London
If the seller’s EICR comes back with C1, C2 or FI items during your conveyancing, your solicitor will usually flag it. You have three options:
- Push the seller to remedy and reissue before exchange (most common)
- Negotiate a price reduction equal to the cost of fixing
- Proceed and remedy yourself after completion (riskiest — you can’t always predict what the fix will cost)
F & A Electrical attends EICR-fail emergencies on a same-day basis across north and east London — we can usually remedy C1/C2 items within 24-48 hours and reissue a satisfactory cert in time for your exchange date.
3. Selling a property in London
You’re not legally required to have a current EICR to sell, but most buyers’ solicitors will ask for one or for confirmation that the wiring is safe. Getting an EICR done before listing the property and remedying anything that fails saves you negotiation pressure mid-conveyancing.
Frequently asked
How long is an EICR valid?
For domestic rental: 5 years. For HMOs: annually. For owner-occupied: as long as you want, but most insurers and conveyancers prefer one less than 10 years old.
Can I challenge a C1 or C2 finding?
Yes, but rarely successful. EICR codes are based on the Electricians Guidance Note 3 (NICEIC/ECA). If you think the inspector made a mistake, request a written explanation. You can commission a second EICR — but if two independent NICEIC contractors call the same item C2, it’s almost certainly C2.
How much should an EICR cost in London?
F & A Electrical EICR pricing: £140 inc VAT for a 1-bed flat, £170 for a 2-bed, £200 for a 3-bed, £250+ for 4-bed+ or licensed HMOs. Commercial EICRs are quoted per visit, typically £280–£600 depending on circuit count.
How fast can you remedy a C1 or C2?
Same-day attendance for solicitor-led EICR emergencies in north and east London. Most C1/C2 items remedied and satisfactory cert reissued within 24-48 hours.
Get a quote — EICR remedials London
If you’ve been hit with an unsatisfactory EICR and need it sorted, send us the PDF and a photo of the consumer unit:
- Call: 07407 627542 or 07500 721453
- Email: info@faelectrical.co.uk
F & A Electrical is a NICEIC-approved contractor based in Tottenham N15, covering Hackney, Islington, Camden, Tower Hamlets, Southwark and surrounding inner London boroughs. £5m public liability, 6 years’ NICEIC warranty on installation work.
Related: EICR Hackney | EICR Islington | EICR Tower Hamlets | EICR Southwark | London service areas hub
