EICR C1, C2, C3 Codes Explained (2026 Guide)

Last updated: 13 September 2026

An EICR (Electrical Installation Condition Report) uses four classification codes to grade electrical faults found during inspection: C1 (danger present, immediate risk), C2 (potentially dangerous, urgent remedial action needed), C3 (improvement recommended), and FI (further investigation required). Only C1 and C2 codes make a report "unsatisfactory" under BS 7671.

Key Takeaways

• A C1 code on an EICR means danger is present and demands immediate remedial action before the inspector leaves the property.
• A C2 code means the installation is potentially dangerous and requires urgent remedial action, even though it is not an instant hazard.
• A C3 code is advisory only — it flags an improvement recommendation but does not fail the report or breach BS 7671.
• Landlords in England risk fines of up to £30,000 per breach for non-compliance with electrical safety regulations, according to Landlord Heaven (2026).
• Since 1 November 2026, councils can fine landlords up to £40,000 per breach, with penalties stacking across multiple breaches, per Property Tax Partners (2026).
• Remedial or further investigative work must be completed within 28 days of inspection, or sooner where the report specifies, according to GOV.UK (2026).

What is an EICR?

An EICR is a formal report produced after a qualified electrician inspects and tests the fixed electrical installation in a building, assessing it against the UK wiring standard BS 7671:2018+A2:2022, published by the Institution of Engineering and Technology (IET). The report records every fault found under Section K "Observations" and assigns each one a classification code — C1, C2, C3 or FI — so that anyone reading the document, from a facilities manager to an insurer, understands the severity at a glance.

EICRs apply to fixed wiring, consumer units, sockets and lighting circuits — not portable appliances, which fall under separate PAT testing (Portable Appliance Testing) regimes. For commercial premises, an EICR forms a core part of the duty owed under the Health and Safety at Work etc. Act 1974 and the Electricity at Work Regulations 1989, both enforced by the Health and Safety Executive (HSE).

Business professionals overseeing commercial or residential portfolios need to understand these codes because an EICR is not a pass/fail certificate in the way an MOT is. It is a graded risk assessment, and misreading a C3 as a minor issue — or a C2 as optional — carries real legal and financial consequences.

Why the codes exist

The coding system comes from IET Guidance Note 3, the industry reference that supports BS 7671. Per iCertifi's summary of the guidance, "Each separate item entered in the Section K 'Observations' section of the Report should be coded C1, C2 or C3 as appropriate, or exceptionally, FI" — a structure designed to give every fault a consistent, auditable severity rating regardless of which electrician or inspection firm carries out the work.

What Does a C1 Code Mean on an EICR?

A C1 code means the inspector has identified a danger present in the installation, carrying an immediate risk of injury, and it demands urgent remedial action on the spot. This is the most serious classification an EICR can carry, and reputable electricians will not leave a property with a live C1 fault unaddressed.

Common C1 examples include exposed live conductors, damaged consumer units with live parts accessible by touch, and severe fire risk from overheating cabling. Per NICEIC contractor guidance, "It would not be reasonable for the inspector to indicate that the installation is in a satisfactory condition if any observation in this report has been given a code C1 or code C2 classification" — meaning a single C1 automatically renders the entire EICR "unsatisfactory".

In practice, most competent electricians will rectify a C1 fault immediately, before completing the report, because leaving live danger unaddressed exposes both the occupier and the inspector to liability. For a commercial landlord or facilities manager, a C1 finding should trigger an immediate response, not a scheduled follow-up visit weeks later.

What Does a C2 Code Mean on an EICR?

A C2 code identifies a fault that is potentially dangerous rather than immediately hazardous, requiring urgent remedial action within a defined timescale rather than instant correction. The distinction from C1 matters: a C2 fault poses a real risk under foreseeable conditions — for example, a fault developing, equipment being used incorrectly, or a protective device failing — but does not present a hazard the moment the inspector observes it.

Typical C2 examples include the absence of residual current device (RCD) protection on socket circuits in a bathroom, inadequate earthing or bonding, or a consumer unit lacking adequate fire-resistant enclosure under the 18th Edition amendments. Like a C1, a C2 finding automatically marks the whole EICR "unsatisfactory" under the same NICEIC guidance quoted above.

For landlords and commercial occupiers, C2 codes are where compliance obligations bite hardest. Under GOV.UK guidance, landlords must complete remedial or further investigative work within 28 days of the inspection, or sooner if specified in the report, according to GOV.UK (2026).

"Compliance fails quietly. Certificates lapse, checks get missed in handovers between contractors, and everything looks fine until an incident or a sale forces an audit. The fix is unglamorous: one owner for the whole compliance calendar, evidence filed as work is done, and no assumption that the previous contractor left things in order." — Mo Hassan, Managing Director, Priority First

That principle applies directly to C2 remediation. A facilities team juggling multiple contractors across a portfolio can easily lose track of a 28-day deadline unless one party owns the compliance calendar end to end.

What Does a C3 Code Mean, and Does It Fail an EICR?

A C3 code flags an improvement recommendation — a deviation from current wiring regulations that does not present a danger but would bring the installation up to today's standard if corrected. Crucially, a C3 code does not make an EICR "unsatisfactory"; the report can still be marked satisfactory overall if C3 is the only code applied.

Common C3 findings include the absence of circuit labelling on a consumer unit, older cable colours (pre-2006 wiring using red and black rather than brown and blue conductors) that remain safe but non-standard, or the lack of RCD protection where it is recommended but not strictly mandatory for that circuit type. Because installations are often inspected against the current edition of BS 7671, a perfectly functional older system will frequently attract several C3 codes simply because standards have evolved since it was installed.

Business professionals sometimes assume any code equals failure, which is inaccurate and can lead to unnecessary spending on non-urgent work while genuine C1 and C2 risks are deprioritised. The correct approach is to treat C3 as a maintenance planning item — worth budgeting for at the next refurbishment or lease renewal — rather than an emergency.

What Does FI Mean, and How Is It Different From a Fail?

FI stands for "Further Investigation" and applies when the inspector cannot determine, without additional intrusive testing, whether a genuine danger exists. An FI code is exceptional rather than routine — the IET Guidance Note 3 wording describes it as something applied "as appropriate, or exceptionally", distinct from the three standard severity codes.

An FI finding means the inspector has spotted something that could be a C1 or C2 issue but needs further access — for example, opening up a void, isolating a circuit, or testing beyond the scope of the original inspection — to confirm. Until that further investigation happens and a definitive code is applied, the safest practice is to treat an FI item with the same urgency as a C2, since it may resolve into one.

C1 vs C2 vs C3 vs FI: comparison table

Code	Meaning	Report outcome	Typical timescale	Example fault
C1	Danger present, immediate risk of injury	Unsatisfactory	Immediate — often fixed before inspector leaves	Exposed live conductors, accessible live parts
C2	Potentially dangerous, urgent action required	Unsatisfactory	Within 28 days per GOV.UK guidance, or sooner if specified	Missing RCD protection, inadequate earthing/bonding
C3	Improvement recommended, not dangerous	Can remain satisfactory	No statutory deadline — plan into maintenance schedule	No circuit labelling, older cable colour coding
FI	Further investigation needed to confirm risk	Outcome pending	As soon as reasonably practicable	Suspected fault requiring intrusive testing

What Are the Legal Obligations Around EICR Codes in the UK?

UK electrical safety law varies by nation and sector, but every jurisdiction now treats C1 and C2 codes as compliance failures requiring documented remedial action. Landlords in England face escalating financial exposure for ignoring these codes, and social housing and commercial sectors are following similar timetables into 2026.

In England, private landlords can face fines of up to £30,000 per breach for failing to comply with electrical safety regulations, according to Landlord Heaven (2026). More recently, since 1 November 2026, local councils have gained the power to fine landlords up to £40,000 per breach, with breaches stacking where multiple failures are found at the same property, per Property Tax Partners (2026).

The social rented sector in England is catching up too: mandatory five-yearly electrical checks apply from November 2026 for all new tenancies and May 2026 for existing tenancies, according to NICEIC (2026). Northern Ireland has moved on a similar timeline — EICRs became mandatory every five years for new tenancies from April 2026, extending to existing tenancies from 1 December 2026, per NICEIC (2026).

Devolved nation requirements

Wales and Scotland already have mature statutory frameworks in place. In Wales, a five-yearly EICR became a legal requirement from 1 December 2022 under the Renting Homes (Wales) Act, per lettingaproperty.com (2026). Scotland has required a five-yearly EICR plus PAT testing since 2015 under the Housing (Scotland) Act 2006, according to lettingaproperty.com (2026).

For commercial premises specifically, there is no single statutory EICR cycle equivalent to the residential rules — instead, the duty flows from the Electricity at Work Regulations 1989 and general risk assessment obligations under the Health and Safety at Work etc. Act 1974, both enforced by the HSE. Most commercial insurers and landlords now expect EICRs at intervals of three to five years depending on the type of premises, with construction sites and high-occupancy buildings typically inspected more frequently.

How Should Businesses Manage C1, C2 and C3 Findings Across a Portfolio?

Managing electrical compliance across multiple sites is fundamentally a documentation and accountability problem, not just a technical one. The businesses that get caught out are rarely the ones with genuinely dangerous wiring — they are the ones who cannot produce evidence of when an issue was found, who was told, and what happened next.

This is where facilities management discipline matters as much as electrical expertise. A single EICR sitting in an email inbox is not a compliance system; a live calendar tracking every property's inspection date, every C1/C2 remedial deadline, and every contractor sign-off is. Priority First's own guide, the Building Manager's Annual Compliance Calendar, sets out exactly this kind of structured annual tracking approach for building managers juggling multiple statutory obligations at once.

In-house tracking vs an accountable partner

For a single site, a spreadsheet and a diary reminder may suffice. For a portfolio spanning several buildings — commercial offices, residential blocks, mixed-use developments — the risk of a missed 28-day C2 deadline or a lapsed five-year cycle rises sharply with every additional site, because responsibility becomes diffuse across multiple contractors and internal staff.

Priority First's broader work on building compliance reflects exactly this pattern. "Compliance fails quietly. Certificates lapse, checks get missed in handovers between contractors, and everything looks fine until an incident or a sale forces an audit," notes Mo Hassan, Managing Director of Priority First. The same logic that applies to fire doors, lift certification and legionella checks applies equally to EICR remedial deadlines — one owner, one calendar, evidence filed as the work happens.

Priority First's facilities management work with a mixed-use development in West London illustrates the wider principle at stake, even though that particular deployment centred on physical security rather than electrical works. The site runs 152 photographed checkpoints across retail, residential, service yards and plant rooms, live since February 2026, precisely because the client wanted delivered work provable rather than asserted — the same standard that should apply to electrical remedial work signed off against a C2 deadline.

Your EICR C1, C2, C3 Compliance Checklist

• Confirm the report references BS 7671:2018+A2:2022 and was carried out by a qualified, registered electrician.
• Check for any C1 code first — this demands an immediate response, not a scheduled callback.
• Log every C2 code with its 28-day remedial deadline, or sooner if the report specifies an earlier date.
• Treat FI codes as provisionally urgent until further investigation confirms the actual severity.
• Budget C3 findings into planned maintenance rather than emergency spend, since they do not fail the report.
• Retain the full EICR and any remedial certificates as documentary evidence for insurers, lenders and, for rented property, local authorities.
• Assign one accountable owner for tracking inspection cycles across every site in a portfolio.
• Re-inspect on the correct statutory cycle for the nation and sector the property sits in — England, Wales, Scotland or Northern Ireland each carry distinct deadlines.

FAQ

What do the codes C1, C2 and C3 mean on an EICR?

C1 means danger is present and demands immediate action, C2 means the fault is potentially dangerous and needs urgent remedial work, and C3 means an improvement is recommended but no danger exists. All three come from IET Guidance Note 3, the standard reference supporting BS 7671:2018+A2:2022.

Does a C3 code mean my EICR has failed?

No, a C3 code alone does not fail an EICR — the report can still be classified "satisfactory" overall. Only C1 or C2 codes, individually or together, make the whole report "unsatisfactory" under NICEIC contractor guidance.

What is the difference between C1 and C2 EICR codes?

A C1 code identifies an immediate, present danger requiring action before the inspector leaves the property, while a C2 code identifies a potentially dangerous fault requiring urgent but not instantaneous remediation. Both codes make the EICR "unsatisfactory", but only C1 typically demands on-the-spot correction.

How long do I have to fix a C1 or C2 fault on an EICR?

For rented residential property in England, remedial or further investigative work must be completed within 28 days of the inspection, or sooner if the report specifies an earlier date, according to GOV.UK (2026). C1 faults are typically expected to be addressed immediately, given they represent live danger.

What does FI mean on an EICR and is it the same as a fail?

FI stands for "Further Investigation" and applies when the inspector cannot confirm a fault's severity without additional testing. It is not automatically a failure, but it should be treated with urgency until the further investigation resolves it into a definitive C1, C2 or C3 code.

Can a landlord be fined for not fixing C1 or C2 issues?

Yes — in England, landlords can face fines of up to £30,000 per breach of electrical safety regulations, according to Landlord Heaven (2026), and since 1 November 2026 councils can fine up to £40,000 per breach, with breaches stacking, per Property Tax Partners (2026).

How often does a property need an EICR under UK law?

The required frequency depends on the nation and tenure type: Scotland has required a five-yearly EICR since 2015 under the Housing (Scotland) Act 2006, Wales introduced a five-yearly requirement from 1 December 2022, and England's social rented sector requires five-yearly checks from November 2026 for new tenancies. Sources: lettingaproperty.com (2026) and NICEIC (2026).

Who can issue or correct EICR classification codes?

Only a qualified, competent electrician carrying out the inspection can assign or amend EICR codes, and reputable inspectors follow IET Guidance Note 3 and BS 7671:2018+A2:2022 when doing so. If a code appears disputed or inconsistent, the correct route is to query it directly with the inspecting electrician or their certification body, such as NICEIC.

Securing Compliant, Evidenced Buildings With Priority First

Electrical compliance is one strand of a much wider obligation that facilities managers and commercial landlords carry across every site they operate — and the same discipline that tracks a C2 remedial deadline should track fire safety checks, lift certification and security cover. Priority First applies exactly that single-owner, evidence-first approach across the buildings it manages, so nothing lapses quietly in the gap between contractors.

Across Priority First's managed sites, checkpoint completions already carry a watermarked photo 100% of the time, replacing the kind of paper-based assurance that leaves compliance gaps invisible until an audit or incident forces the issue. That standard of provable, timestamped record-keeping is the same principle that should apply to every EICR remedial action, fire door check and lift inspection on a commercial or residential portfolio.

If your business needs one accountable partner covering facilities management, compliance tracking and security across a London or nationwide portfolio, get in touch with Priority First to discuss how a structured compliance calendar and evidenced building operations can be built around your sites. Explore Facilities Management with Priority First to see how compliance, maintenance and security come under one accountable roof.

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• Building Compliance Services London | Priority First 2026
• Security Compliance Managing Agents: UK Guide 2026