If you have received an Electrical Installation Condition Report, the codes on the document can look confusing at first. C1, C2, C3 and FI are not random notes; they explain how serious each electrical observation is and what action is needed next. At Electrician in London, we help landlords, homeowners and property managers understand EICR codes clearly so they know whether their property has passed, failed or needs remedial work.
In the UK, EICR classification codes are used to record the condition of the fixed electrical installation. They help show whether a fault is immediately dangerous, potentially dangerous, recommended for improvement or requires further investigation. Understanding these codes is especially important for landlords, because an unsatisfactory EICR can affect legal compliance, tenant safety and the ability to rent out a property.
Why EICR Codes Matter
An EICR is more than a checklist. It is a professional safety report that identifies electrical risks inside a property. The electrician inspects and tests circuits, consumer units, wiring, earthing, bonding, sockets, switches and protective devices. Any concern found during the inspection is given a classification code.
The code tells you how urgent the issue is. Some issues require immediate action before the electrician leaves. Others need urgent remedial work. Some are only recommendations for improvement. Without understanding the code, it is easy to either panic unnecessarily or underestimate a serious risk.
C1 Code: Danger Present
A C1 code is the most serious EICR classification. It means danger is present and there is a risk of injury. Immediate remedial action is required.
A C1 issue is not simply something outdated or inconvenient. It means someone could be at immediate risk of electric shock, burns or fire. In many cases, the electrician may need to make the danger safe before leaving the property.
Examples of C1 issues may include exposed live parts, accessible damaged wiring, severe overheating, broken electrical equipment exposing dangerous components, or a situation where a person could touch live electricity.
If your EICR includes a C1 code, the report will be unsatisfactory. You should not ignore it, delay action or continue using the affected part of the installation until it has been made safe.
C2 Code: Potentially Dangerous
A C2 code means the issue is potentially dangerous. It may not present immediate danger at the exact moment of inspection, but it could become dangerous if a fault occurs or if the installation is used in certain conditions.
C2 observations require urgent remedial action. They are serious enough to make an EICR unsatisfactory.
Examples of C2 issues may include lack of adequate RCD protection in higher-risk areas, poor earthing or bonding, damaged accessories, unsafe circuit arrangements, signs of overheating, incorrect protective devices or defects that could increase shock or fire risk.
Many landlords are surprised when a property receives a C2 code because the electrics may appear to work normally. However, electrical safety is not only about whether lights turn on or sockets work. It is about whether the installation can protect people properly when something goes wrong.
C3 Code: Improvement Recommended
A C3 code means improvement is recommended, but the issue is not considered dangerous or potentially dangerous at the time of inspection. A C3 observation does not normally make an EICR unsatisfactory by itself.
This code is often used where the installation could be improved to meet current standards, but the existing condition does not present a significant safety risk. For example, an older installation may not have every modern feature, but it may still be safe for continued use.
Examples of C3 observations may include recommended upgrades, improved labelling, older accessories, or suggestions to improve protection where the lack of improvement is not currently classed as dangerous.
Although C3 does not usually mean failure, it should not be ignored completely. It gives useful guidance for future upgrades and can help improve long-term electrical safety.
FI Code: Further Investigation Required
FI means further investigation is required without delay. This code is used when the electrician cannot fully determine the safety of part of the installation during the inspection.
FI is serious because it means there may be a hidden defect or unresolved safety concern. The electrician has found something that needs more detailed investigation before the installation can be properly assessed.
Examples may include unusual test results, inaccessible wiring concerns, suspected hidden damage, unexplained circuit behaviour or signs of a fault that cannot be confirmed without additional work.
An FI code will usually make the report unsatisfactory until further investigation has been completed and the issue has been resolved or properly classified.
Which EICR Codes Make a Report Unsatisfactory?
In general, an EICR will be unsatisfactory if it includes C1, C2 or FI observations. A C3 observation alone does not normally make the report unsatisfactory. UK government guidance explains that C1 means danger present, C2 means potentially dangerous, C3 means improvement recommended, and FI means further investigation required without delay.
This is why it is important to look beyond the word “unsatisfactory” and read the actual observations. A report with one urgent defect is very different from a report with several serious issues across multiple circuits.
Once remedial work is completed, you should keep evidence of the repairs with the original report. For landlords, this paperwork is important for proving that action has been taken.
Common EICR Defects Found in London Properties
London properties vary widely in age and condition. Some homes have modern consumer units and updated wiring, while others have older installations that have been altered many times over the years.
Common EICR issues in London homes include:
- Outdated consumer units
- Missing or inadequate RCD protection
- Poor earthing or bonding
- Damaged sockets or switches
- Overloaded circuits
- DIY electrical alterations
- Unclear circuit labelling
- Signs of overheating inside accessories
These problems do not always mean a full rewire is needed. In many cases, targeted remedial work can bring the installation back to a satisfactory condition.
What Landlords Should Do After Receiving EICR Codes
Landlords should act quickly if an EICR contains C1, C2 or FI observations. Electrical safety rules for rented properties require landlords to ensure the installation is safe and that required remedial work is completed within the correct timeframe.
If a C1 is found, the danger should be made safe immediately. If C2 or FI observations are found, remedial work or investigation should be arranged promptly. After the work is completed, keep written confirmation from the electrician.
Landlords can book London Landlord EICR Certificates from £79.99 ⚡ to check the safety condition of a rental property and receive clear guidance on any required work.
Do C3 Codes Need to Be Fixed?
C3 codes do not usually require urgent remedial work, but they are still useful recommendations. If you want to improve the property’s electrical safety, reduce future risks or prepare for a sale, it may be sensible to deal with C3 items at the same time as other electrical work.
For landlords, C3 observations may not make the report unsatisfactory, but they can indicate areas where the installation is falling behind modern expectations. Addressing them early can help avoid future problems.
Can You Rent a Property with C1 or C2 Codes?
A rental property with unresolved C1 or C2 observations should not be treated as electrically safe. These codes indicate danger or potential danger, and the report will normally be unsatisfactory.
Landlords should arrange remedial work as soon as possible and keep proof that the defects have been fixed. Letting agents may also request this documentation before marketing or continuing a tenancy.
EICR Certificate Cost in London
The cost of an EICR in London depends on the property size, number of circuits, access, installation condition and whether the property is a flat, house, HMO or commercial premises.
If you want clear pricing before booking, you can check EICR Certificate Cost in London. A properly completed report should clearly explain any C1, C2, C3 or FI observations and what action is needed next.
Choosing a qualified electrician is important. The correct coding of defects requires experience, judgement and proper testing.
Final Advice: Understanding EICR Codes
EICR codes help explain the seriousness of electrical defects. C1 means danger is present and immediate action is needed. C2 means potentially dangerous and urgent remedial work is required. C3 means improvement is recommended. FI means further investigation is required without delay.
If your report is unsatisfactory, do not panic, but do act quickly. A qualified electrician can explain the observations, carry out remedial work and help you keep the property safe and compliant.
Need Help with EICR Codes in London?
If you have received an EICR and need help understanding C1, C2, C3 or FI observations, contact London Electricians for professional testing, remedial work and clear electrical safety advice across London.