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Your rental property has just come back with an EICR C3 code consumer unit landlord compliance UK headache — and the electrician is already quoting £800 for a full RCBO board upgrade. Before you sign anything, understand what those codes mean, what the law actually requires you to fix, and where the line sits between a legitimate safety recommendation and a sales pitch dressed up as regulation. We work with landlords across London every week, from Walthamstow to Wandsworth, and this is the conversation we wish more electricians were having honestly.
What C1, C2, C3, and FI codes actually mean — and which ones you must fix
The Electrical Installation Condition Report uses four standardised codes to classify every defect or departure from current wiring regulations. Understanding the difference between them is the most important thing a landlord can do before deciding what work to commission.
C1 — Danger Present. A C1 means there is a real and immediate risk of injury, electric shock, or fire. When an inspector finds a C1, they will often make the hazard safe before leaving the premises. The overall EICR result will be Unsatisfactory, and the Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020 require you to complete remedial work within 28 days, or sooner if the report specifies. In practice, C1 faults need addressing urgently.
C2 — Potentially Dangerous. A C2 means the fault is not causing danger right now, but could under predictable circumstances — deteriorating insulation, an overloaded circuit, or a faulty connection are typical examples. A C2 also makes the EICR Unsatisfactory. Landlords must carry out remedial work within 28 days and supply written confirmation to the tenant and local housing authority. Failure to act on C1 or C2 codes leaves landlords exposed to enforcement action and financial penalties of up to £30,000.
C3 — Improvement Recommended. This is where most of the confusion — and much of the upselling — takes place. A C3 is not a failure. It is an advisory observation, meaning the installation does not fully conform to current wiring regulations but does not present a danger. The UK Government’s own guidance states plainly that C3 codes do not require remedial work for the report to be deemed satisfactory. A report with only C3 observations still receives an overall Satisfactory result. Landlords are not legally obliged to act on C3 codes. Your electrician cannot tell you that C3 findings mean your EICR has “failed.” It has not.
FI — Further Investigation Required. An FI code means the inspector could not fully assess an aspect of the installation and further investigation is needed. Like C1 and C2, an FI makes the EICR Unsatisfactory and must be resolved within 28 days. The finding will then either be cleared or reclassified as C1, C2, or C3.
In short: only C1, C2, and FI codes trigger your legal obligation to act. C3 observations do not. We have sat down with landlords in Islington and Hackney who were handed quotes for board upgrades on the basis of C3 findings alone — work that was entirely optional under the regulations. Knowing the difference protects your wallet and your compliance position equally.
Consumer unit upgrades and RCBOs — when it is necessary and when it is upselling
The consumer unit — sometimes still called the fuse box — is the most common subject of post-EICR upgrade recommendations, and the area where landlords are most frequently pushed towards work they do not legally need. Here is what the rules say, and what they do not.
The current wiring regulations, BS 7671:2018 (18th Edition), require that new installations include RCD (residual current device) protection across circuits. An RCD cuts power within milliseconds when a fault is detected, providing critical protection against electrocution and fire. Modern boards use either dual RCD protection or individual RCBOs (residual current breakers with overcurrent protection) on each circuit.
Here is the key legal point most landlords are not told: the Private Rented Sector regulations do not require landlords to upgrade an existing installation to the latest version of BS 7671 unless unsafe findings on the EICR warrant it. Older consumer units are not automatically made illegal by a newer edition of the wiring regulations. The standard explicitly acknowledges older installations and does not demand wholesale replacement simply because the rules have since changed.
When is an upgrade genuinely necessary? If your EICR returns a C1 or C2 code directly attributable to the consumer unit — for example, a unit with deteriorated components, a genuine fire risk, or one installed after RCDs were required but never properly fitted with them — then replacement is warranted. In those cases, we always recommend acting promptly.
When is it upselling? If your consumer unit is an older but functional fuse board and the EICR observation is coded C3, the upgrade is advisable from a safety perspective but is not a legal requirement. An electrician who says a C3 means you must replace the board to achieve compliance is not being accurate. Some go further, insisting only a full RCBO board will do, when a dual-RCD board would address the concern at lower cost.
We recently helped a landlord in Lewisham quoted £1,100 for a full RCBO consumer unit upgrade following a C3 observation on an older dual-RCD board performing perfectly well. The EICR result was Satisfactory. There was no legal obligation to replace anything. The upgrade was optional — to be done on his own timeline, not under artificial urgency. RCBOs do offer genuine advantages — a fault on one circuit trips only that circuit rather than half the board — and we would never discourage voluntary upgrades. But a recommendation is not a legal requirement.
What landlords are legally required to do after an EICR — timelines and enforcement
The Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020 set out clear obligations for private landlords. Here is what the framework requires — and where its limits lie.
The five-year inspection cycle. Landlords must have each rental property’s electrical installation inspected and tested by a qualified and competent person at least every five years. A satisfactory EICR must be in place before a new tenancy begins. The report must be supplied to new tenants before they move in, to existing tenants within 28 days of the inspection, and to any prospective tenant within 28 days of a written request.
The 28-day remediation rule. If the EICR is Unsatisfactory — containing any C1, C2, or FI observations — landlords must complete all required remedial or investigative work within 28 days of the inspection date, or sooner if specified. Some C1 faults require immediate action; the report itself will state this.
Written confirmation of completion. Once remedial work is done, obtain written confirmation from a qualified electrician. Acceptable forms include a new satisfactory EICR, an Electrical Installation Certificate (EIC), or a Minor Electrical Installation Works Certificate (MEIWC). This confirmation and the original EICR must be provided to tenants within 28 days of completion, and to the local housing authority within seven days of any request.
What happens if you miss the deadline? Local authorities can serve a remedial notice, arrange the work themselves and recover the cost from you, and impose financial penalties of up to £30,000 per breach — with multiple penalties where there are multiple breaches. In practice, councils typically act only where landlords have clearly failed to take reasonable steps, but that protection requires a documented paper trail of attempts to comply.
A note on Wales and Scotland. The regulations above apply to the private rented sector in England. Scotland has required EICRs since 2015, and Wales operates under the Renting Homes (Wales) Act. If you manage property outside England, confirm the applicable rules with a qualified professional in that jurisdiction.
Landlords in areas like Newham and Tower Hamlets — boroughs with active housing enforcement teams — often ask us whether their compliance position is watertight. Our approach is straightforward: keep the paperwork trail complete. The EICR, remediation certificate, and notification to tenants form the documentation that protects you if questions are ever raised.
How to read your EICR report properly — the sections that matter most
An EICR is a structured document. Once you know what to look for, it is straightforward to interpret. Many landlords either panic at the word “observations” or assume everything is fine because they were told it “passed.” Neither response is quite right.
The overall outcome. The first thing to check is the overall result, usually displayed prominently on the front page or summary section: either Satisfactory or Unsatisfactory. Satisfactory means the installation is safe for continued use — even if the report contains C3 advisory observations. Unsatisfactory means action is legally required. Do not let anyone conflate these two outcomes.
The observation schedule. This is the substantive part of the report — a numbered list of every observation, each assigned a code. Read every line. For each C3 observation, note what it refers to and consider whether it warrants attention. For any C1, C2, or FI observations, these are the items that must be remediated within the required timeframe.
The recommended next inspection date. If the report recommends re-inspection in less than five years, take that seriously — it usually indicates a deteriorating installation or C3 observations the inspector expects to worsen.
The inspector’s qualifications. The inspection must be carried out by a qualified and competent person — in practice, someone registered with a recognised scheme such as NICEIC or NAPIT. Always confirm the inspector’s credentials before commissioning the report.
The scope and limitations. EICRs include a section describing what was inspected and any limitations — for example, if concealed wiring could not be tested or access to certain areas was restricted. These limitations are normal and do not invalidate the report, but they flag areas where the assessment is incomplete. Importantly, an EICR covers fixed electrical installations only — wiring, consumer unit, sockets, light fittings. It does not cover portable appliances (those require a PAT test) or gas systems. If your electrician quotes for items not referenced in the observation schedule, ask them to identify the specific code each item addresses.
How Fixiz handles EICRs — honest testing, clear recommendations, no unnecessary upgrades
We are Fixiz Ltd, a London-based property works company. When we carry out an EICR, we test the installation against BS 7671 wiring regulations and record every observation accurately, without exaggerating findings to generate follow-on work. If the installation is Satisfactory with C3 advisory observations, we tell you exactly that — the property is compliant, and here is what each observation means in plain English. We do not recode C3 items as C2 to manufacture an upgrade requirement, and we do not present optional improvements as legal obligations.
Where C1 or C2 faults exist — and they do, across London’s older housing stock, from the Victorian terraces of Brixton to the Edwardian flats of Finsbury Park — we explain precisely what each fault is, why it matters, and what the most appropriate remediation looks like. That might mean a targeted repair to a specific circuit, replacement of a faulty component, or in some cases a consumer unit upgrade. When we recommend a full upgrade, we can show you which specific observation makes it necessary and why a lesser intervention would not adequately address it.
We also discuss options where they exist. A dual-RCD consumer unit and a full RCBO board both provide RCD protection — the difference is cost and the scope of protection per circuit. If your installation warrants a board upgrade and budget is a consideration, we will talk you through both options honestly rather than defaulting to the most expensive solution.
Our remediation work is certificated correctly — every job that requires one receives an Electrical Installation Certificate or Minor Works Certificate, giving you the written confirmation you need for compliance. We handle the paperwork so your records are clean and complete, which matters if a local authority or letting agent ever asks to see them.
We cover all London boroughs — from portfolio landlords managing dozens of properties to individuals letting a single flat for the first time. Our position is the same in every case: we work for you, not for a sales target, and an honest assessment that saves you money on unnecessary work is as much a part of our service as the work we carry out.
Frequently asked questions
My EICR has three C3 observations. Has it failed?
No. An EICR with only C3 observations receives an overall Satisfactory result. C3 means improvement recommended — not danger present or potentially dangerous. You are not legally required to act on C3 observations. If anyone tells you the report has “failed” because of C3 codes, that is factually incorrect under the Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020.
Does a C3 on my consumer unit mean I must replace it?
No. A C3 on the consumer unit is an advisory recommendation, not a legal mandate. The Private Rented Sector regulations do not require upgrading an installation to the current edition of BS 7671 simply because it pre-dates those standards. If the unit is functional and poses no active danger, there is no obligation to replace it. A damaged unit, or one installed after RCDs became mandatory but never fitted with them, is more likely coded C2 — which does require action.
How long do I have to fix a C1 or C2 fault?
The standard timeframe is 28 days from the date of inspection under the Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020. Some C1 faults require immediate action — the report will state this clearly. If legitimate practical constraints prevent completion within 28 days, document all steps taken. A landlord who can demonstrate they took all reasonable steps is not in breach, but that protection requires a clear paper trail.
Do I need a new EICR after remedial work?
Not always. Written confirmation — an Electrical Installation Certificate, a Minor Works Certificate, or a new satisfactory EICR — is what the regulations require. A full new EICR is only necessary where substantial new work has been carried out or where the original inspector recommends one. For most targeted repairs, a Minor Works Certificate alongside the original EICR is sufficient.
Can my EICR inspector also quote for the remedial work?
Yes — there is nothing legally prohibited. However, it creates a conflict of interest: an inspector who benefits financially from remedial work has an incentive to code observations more severely. Most electricians act honestly, but it is a reason to understand the code classifications yourself and seek a second opinion if the quote feels disproportionate to what the report describes.
Ready to move from confusion to construction? Get in touch with Fixiz today for a no-pressure chat about your project and the fastest route to full compliance.