Electrical safety guide · England · 2026
An Electrical Installation Condition Report is a detailed inspection and test of an existing electrical installation, designed to determine whether it is safe for continued use. This guide explains the customer-facing basics and the technical work behind a meaningful EICR.
The basics
EICR means Electrical Installation Condition Report. It is a condition assessment of the fixed electrical installation — not simply a visual look at the fuse box.
A structured inspection and testing process that considers the condition, safety and suitability for continued use of wiring, circuits, protective devices, earthing, bonding and accessible fixed electrical equipment within the agreed extent.
It is more than looking at the consumer unit, using a plug-in socket tester, pressing an RCD test button or filling in a certificate. Measurements need to be meaningful and interpreted in the context of the installation.
A socket may still power equipment even where the circuit protective conductor is broken or poorly connected.
Every socket on a ring final circuit can appear to work even when one section of the ring has become open circuit.
Heat, water, screws, crushing or age can damage insulation without an obvious visible sign at the accessory.
An RCD can be present and look normal but still require proper assessment of its operation and application.
Who it helps
Not every customer has the same legal duty, but an EICR can be useful wherever the condition or history of a fixed electrical installation needs to be understood.
Useful for periodic safety assessment, older installations, unknown history, recurring electrical issues, major refurbishment or where documentation is missing.
Rented homes in England are subject to specific electrical safety duties, including periodic inspection and testing at least every five years or sooner when required by the report.
Helps manage compliance dates, tenant changeovers, remedial work and an auditable record of the electrical installation’s condition.
Duty holders need to manage electrical risk. Periodic inspection intervals depend on the use, environment, maintenance regime and actual condition of the installation.
A pre-purchase EICR can be useful where there are old consumer units, extensions, DIY alterations, missing certificates or an unknown electrical history.
HMOs can have additional licensing and management considerations. Electrical inspection frequency and any local licence conditions should be checked for the specific property.
Inspection intervals
The most important distinction is between professional guidance and legal duties. They can overlap, but they are not the same thing.
GN3 provides technical guidance for initial inspection frequencies for different types of installations. These are recommendations and do not automatically become law simply because they appear in the table. The inspector must determine the next interval from actual condition, use and circumstances.
For rented homes covered by the Electrical Safety Standards Regulations in England, landlords must generally arrange qualified inspection and testing at least every five years, or sooner where the report sets an earlier date, and comply with remedial/investigative duties.
For normal owner-occupied domestic accommodation, the traditional GN3 recommended initial maximum interval is commonly expressed as change of occupancy / up to 10 years. That is a starting point — not a promise that every installation is safe for ten years.
An earlier inspection can make sense where there is unknown electrical history, an older installation, DIY alterations, repeated RCD tripping, hot accessories, burning smells, buzzing or crackling, water or fire damage, a major refurbishment, or missing electrical documentation.
GN3 / professional guidance: rented domestic accommodation has traditionally carried a recommended maximum interval of 5 years or change of occupancy. A change of occupant can matter because damage, alterations and patterns of use may have changed since the last inspection.
Legal requirement in England: the regulations generally require covered landlords to have the fixed electrical installation inspected and tested by a qualified person at least every 5 years, or sooner where the previous report requires it.
No — not automatically under England’s landlord regulations. GOV.UK guidance says that where inspection/testing was carried out less than five years ago and the report does not require further investigative or remedial work, a new inspection is not required just because the property is re-let. The latest report must be supplied to the new tenant. A visual check before re-letting is recommended, and an earlier full inspection may still be sensible where damage or alteration is suspected.
| Type of installation | Commonly referenced initial interval | Important qualification |
|---|---|---|
| Owner-occupied domestic | Change of occupancy / up to 10 years | Condition, age, alterations and use can justify an earlier inspection. |
| Rented domestic | 5 years / change of occupancy guidance | England law is separately framed around at least five-yearly inspection or sooner if the report requires. |
| HMOs | Commonly 5 years / change of occupancy guidance | Check local licensing and property-specific duties as well. |
| Commercial premises | Often around 5 years | Actual risk, environment and maintenance arrangements matter. |
| Offices | Often around 5 years | The next date must be set for the actual installation, not copied automatically. |
| Shops | Often around 5 years | High wear, alterations or public use can affect the interval. |
| Industrial premises | Often around 3 years | Harsh conditions, machinery and maintenance practices can require closer attention. |
| Educational establishments | Often around 5 years | Routine checks between periodic inspections may also be appropriate. |
| Hotels / restaurants / public houses | Often around 5 years | Parts of a site may need different intervals depending on environment and use. |
| Leisure complexes | Often around 3 years | Special locations such as pools require separate consideration. |
| Theatres / places of public entertainment | Often around 3 years | Licensing or other duties may impose separate requirements. |
| Agricultural premises | Commonly shorter than standard commercial intervals | Corrosion, livestock, dust, moisture and mechanical damage can significantly affect risk. |
| Caravans | Commonly around 3 years | Specific installation type and use should be checked against current guidance. |
| Caravan parks | Often around 1 year | Public/outdoor infrastructure can require frequent assessment. |
| Marinas | Often around 1 year | Water and corrosion make this a specialist environment. |
| Swimming pools | Often around 1 year | Special-location requirements and environmental conditions apply. |
| Launderettes | Often around 1 year | Heavy use and moisture can justify shorter cycles. |
| Petrol filling stations | Often around 1 year | Specialist hazardous-area considerations may apply. |
| Construction-site installations | Typically around 3 months | Temporary installations are exposed to frequent change and damage. |
Important: this table is an educational overview of commonly referenced recommended initial frequencies, not a substitute for the current edition of IET Guidance Note 3 or site-specific judgement. The next inspection interval must be selected by a competent inspector based on the installation’s condition, use and environment. Routine checks are not the same as a full periodic inspection/EICR. References to 3-month, 4-month, 6-month or 1-year checks can in some contexts refer to routine inspection/checks rather than requiring a complete EICR at every such interval. The current guidance and the particular installation must be read carefully.
Classification codes
Coding is based on the complete circumstances. Examples below are deliberately described as situations that may attract a code — a competent inspector must assess the actual risk.
BS 7671:2018+A4:2026 changed the EICR treatment of FI. Under the A4 model form, FI means “Further investigation is advised” and FI by itself does not make the report unsatisfactory. Older A3-era forms and current GOV.UK landlord guidance may still use the earlier wording “Further investigation required without delay”. Amendment 4 was published on 15 April 2026 and may be used during the transition; Amendment 3 remains valid until 15 October 2026. During this transition, read the edition/form actually used and separately comply with any applicable landlord legal duties.
Danger exists now; another fault does not have to occur first. Depending on the circumstances, examples may include accessible exposed live conductors, severely broken accessories exposing live parts, accessible live busbars or metalwork already live because of an existing fault.
The danger may not be immediately accessible now, but a foreseeable fault or situation could create danger. Depending on the installation, examples may involve ineffective earthing, missing effective main protective bonding where required, missing CPC to Class I equipment, certain defective RCD arrangements, serious fault-protection/Zs problems, significant insulation deterioration, certain unsafe bathroom arrangements or unsafe previous alterations.
A C3 is not considered immediate or potential danger. Depending on circumstances, it may relate to older arrangements without some modern protective measures, certain older RCD/consumer-unit characteristics or identification improvements that do not justify C1 or C2.
An EICR containing C3 observations alone can still be satisfactory.
FI is appropriate where inspection/testing identifies a possible safety issue but the inspector cannot reasonably determine the actual condition within the EICR’s extent and limitations. It should not be a substitute for understanding normal test results or for routine fault-finding that can be appropriately classified.
Myth busting
An EICR is an assessment of safety for continued use. An existing installation is not simply treated as if it were a brand-new 2026 installation.
No. Age and type are relevant, but the actual safety, protection, condition and surrounding installation must be assessed.
No. A plastic enclosure alone is not an automatic reason for an unsatisfactory EICR. The inspector assesses the real risk and installation circumstances.
No. Older installations may have been designed to earlier standards. A departure from the latest edition does not automatically make the installation unsafe; engineering judgement is required.
Competence
Electrical installation work and periodic inspection/testing are closely related, but they are not identical competencies. Condition reporting requires test skill, interpretation and engineering judgement.
Professional competence is not demonstrated by producing a list of numbers. The inspector needs to decide whether readings make sense together, whether the installation is safe for continued use, what limitations matter and how an observation should be classified.
Under NAPIT’s published Electrical Inspector Scheme competence requirements for relevant periodic inspection/testing categories, applicants are expected to demonstrate an appropriate Level 3 qualification, a minimum of two years’ practical experience in periodic inspection and testing, current technical knowledge/CPD and competence assessment. This is a useful professional benchmark under the relevant NAPIT/EAS scheme requirements — not a universal statutory rule saying every person in England must have exactly two years’ experience before they can legally carry out any EICR.
Choosing an inspector
You do not need to become an electrician to ask sensible questions about who is inspecting your property.
If AVAG records a C1, C2, C3 or FI, the customer should be able to understand what was found, how it was identified, why it matters, what the classification means and what action is recommended.
The report should help the person responsible for the installation make a sensible safety decision — not simply present unexplained codes or technical readings.
Professional process
A periodic inspection is planned and risk-assessed. The exact sequence and extent depend on the installation, but the process normally combines inspection, safe isolation, appropriate tests and professional interpretation.
Condition, damage, suitability, accessible wiring, accessories and protective measures.
Circuits are safely isolated where required for inspection and dead testing.
Relevant continuity, insulation and other measurements are made as appropriate.
Energised measurements are carried out where appropriate and justified.
Results are compared with each other, the circuit design and protective measures.
Observations, extent, limitations and overall condition are recorded clearly.
Necessary remedial work or sensible improvements are explained to the client.
Mains inspection and testing requires competence, suitable equipment and safe working practices. This guide explains what electricians assess and why — it does not provide instructions for unqualified visitors to carry out live or dead electrical tests themselves.
Technical explainers
Different tests answer different questions. No single reading proves that an entire circuit or installation is safe.
Checks whether the required protective/fault path is electrically continuous and credible.
Why it matters: fault protectionLooks at the integrity and electrical sense of UK ring final socket circuits.
Why it matters: hidden open conductorsProvides useful information about line and protective-conductor resistance on a circuit.
Why it matters: fault pathCan reveal deterioration or unwanted leakage paths not visible during normal operation.
Why it matters: hidden cable conditionChecks that conductors, switching and connections are arranged with correct polarity.
Why it matters: safe switchingIdentifies the supply earthing system and how it affects protective measures and interpretation.
Why it matters: protection strategyExternal earth fault loop impedance gives information about the external supply/earthing path at the origin.
Why it matters: supply fault pathCircuit earth fault loop impedance is considered with the protective device and required disconnection performance.
Why it matters: automatic disconnectionAssesses the fault current that protective devices may need to interrupt safely.
Why it matters: breaking capacityAn installed RCD is assessed for correct type/application and appropriate operating performance.
Why it matters: protective operationRelevant switches, isolators, controls and test functions are assessed where applicable.
Why it matters: intended operationA circuit can continue to operate even when its protective conductor is broken, disconnected, poorly connected or unusually high resistance. Testing helps establish whether the protective path required for fault protection exists and makes electrical sense.
Normal operation primarily proves that the live circuit can supply the load; it does not by itself prove protective-conductor integrity.
Many UK socket circuits are ring final circuits. Professional testing can include end-to-end continuity measurements of r1 (Line), rn (Neutral) and r2 (CPC). The values should make electrical sense relative to conductor size, circuit length, cable configuration and each other.
Additional ring assessment can help identify a broken Line, Neutral or CPC, unexpected interconnections, cross-connected circuits, abnormal spurs, poor connections or incorrect circuit identification.
Every socket may remain energised even when one part of the ring is open. A simple plug-in socket tester cannot properly verify the integrity of the ring final circuit.
R1 is the resistance of the circuit Line conductor and R2 is the resistance of the circuit protective conductor. R1+R2 provides useful information about the circuit fault path and protective-conductor continuity.
In context it may help identify loose or high-resistance joints, damaged conductors, abnormal CPC continuity or an incorrect circuit arrangement. It must be interpreted alongside other inspection and test results — it does not prove every aspect of the circuit by itself.
Electrical cable insulation can deteriorate because of age, heat, moisture, leaks, nails or screws, rodents, crushing, contamination and poor installation. Equipment may still appear to operate normally while insulation is deteriorating.
Professional insulation-resistance assessment can consider insulation between live conductors and between live conductors and Earth. Connected sensitive electronic equipment, surge protective devices and other equipment must be properly considered before test voltages are applied.
An unusually low value has to be interpreted in context. Randomly replacing cable or accessories without understanding the circuit and connected equipment is not a meaningful inspection strategy.
Polarity matters because protective devices and single-pole switches need to be connected in the correct conductor and accessories need correct Line/Neutral arrangements. Equipment can sometimes still appear to operate despite a polarity problem.
Concerns can include reversed Line/Neutral, single-pole switching in the wrong conductor, incorrect socket connections or incorrect protective-device connections.
Common UK arrangements include TN-S, TN-C-S and TT. The earthing arrangement affects how fault protection is achieved and how measurements are interpreted. A competent inspector identifies the arrangement and considers the associated earthing and bonding provisions rather than treating test values in isolation.
In simple terms, if a Line-to-Earth fault occurs, the fault path normally needs sufficiently low impedance for the protective arrangement to disconnect within the required time. An abnormally high result can mean protection may not operate as intended. Ze should not simply be copied from an old certificate where a current assessment is required.
The inspector may assess the prospective fault current available at the origin. Protective devices need suitable breaking capacity for the fault current they may be required to interrupt. This is one of several supply and protective-device characteristics considered during inspection and testing.
Having an RCD fitted does not automatically prove that it is suitable or operating correctly. The inspector considers the RCD type, rating, application, test results and whether it is being used for fault protection, additional protection or another purpose.
The integral test button is useful for routine user testing where manufacturer guidance calls for it, but it is not the same thing as a professional assessment during an EICR.
Relevant switches, isolators, RCD test functions, control equipment and protective devices may need functional assessment where applicable. The purpose is to confirm that equipment intended to operate, isolate or control the installation functions appropriately within the agreed inspection scope.
Parts of comprehensive testing normally require safe isolation, so temporary interruption should be expected. Tell the inspector in advance about critical Wi-Fi/network equipment, lights, heating controls, computers, appliances, medical or alarm equipment and anything that cannot simply be switched off without planning.
There is no credible universal time. Duration depends on property size, number of circuits and consumer units, access, installation age and condition, defects, alterations, previous records and the agreed extent of inspection/testing.
A visit consisting only of opening the consumer unit, pressing an RCD button and checking a few sockets should not be confused with comprehensive periodic inspection and testing.
An EICR is a periodic condition assessment. It is not unlimited diagnostic fault-finding. An abnormal test result can sometimes require additional diagnostic work outside the agreed EICR scope.
That does not mean the inspector should immediately give up and use FI. Reasonable inspection/testing and competent interpretation are still expected before deciding the condition cannot be verified within the agreed extent/limitations.
Examples can include inaccessible wiring, flooring, built-in furniture, equipment that cannot be isolated, inaccessible rooms or buried cables.
Limitations should be reasonable, clear and recorded. They should not be used as an excuse to avoid meaningful inspection and testing.
After the report
No. An unsatisfactory report tells you that safety issues need attention; it does not automatically prescribe the most expensive solution.
Examples may include repairing damaged conductors, restoring CPC continuity, repairing a broken ring final circuit or correcting polarity.
Earthing/bonding defects, damaged accessories or defective protective devices can sometimes be addressed as targeted remedial work.
A complete rewire recommendation should be supported by the actual condition of the installation, extent of deterioration and technical evidence — not simply by age.
England landlord duties
For properties covered by the regulations in England, the inspection report creates practical record-keeping and remedial obligations.
Where the report identifies work that the regulations require to be completed, landlords generally need to arrange it within 28 days or within any shorter period specified as necessary in the report. Appropriate written confirmation/certification should then be obtained and supplied as required.
The existence of a general 28-day statutory remedial window should never be read as permission to leave an immediate danger energised or unmanaged for 28 days.
Common confusion
The names sound similar, but they answer different questions.
| EICR — fixed installation | PAT / in-service equipment inspection |
|---|---|
| Fixed wiring and circuits | Electrical appliances/equipment where appropriate |
| Consumer unit / distribution equipment | Plugs and flexible leads |
| Socket and lighting circuits | Portable/movable equipment within the inspection regime |
| Earthing, bonding and protective devices | Condition and tests relevant to the equipment |
They are not the same inspection. See AVAG’s PAT testing service for equipment inspection/testing.
Typically relates to new installation work, a new circuit or other relevant installation work. It certifies the work covered by that certificate.
Assesses the condition of an existing installation. Replacing a consumer unit and receiving an EIC does not automatically mean every part of the pre-existing installation has undergone a full periodic EICR.
It is not automatically a legal requirement for every buyer, but it can be valuable where the property is older, has an old consumer unit, evidence of DIY alterations, extensions/refurbishments, missing certificates or an unknown electrical history. It can identify issues before they become your responsibility.
An owner-occupier in England is not generally required to obtain a new EICR simply because an ordinary home is being sold. A recent report can nevertheless give useful information to buyers and can reveal issues you may prefer to address before the sale.
Burning smells, arcing, smoke, very hot sockets/switches, exposed live parts, repeated tripping, electric shock, buzzing/crackling, water entering a consumer unit or severe electrical damage can require urgent fault finding or isolation rather than waiting for a routine EICR appointment. If there is immediate danger, keep people away and contact an appropriate emergency service/electrician.
Frequently asked questions
Short answers to the most common questions. The longer sections above explain the technical detail and 2026 standards transition.
An Electrical Installation Condition Report is a periodic inspection and testing report for an existing fixed electrical installation, intended to assess whether it is safe for continued use within the agreed extent and limitations.
Traditional GN3 initial guidance for owner-occupied domestic accommodation is commonly expressed as change of occupancy / up to 10 years, but earlier inspection can be appropriate because of age, condition, alterations, damage or unknown history.
Landlords covered by the relevant regulations generally need the fixed installation inspected and tested by a qualified person at least every five years, or sooner where the previous report specifies an earlier date.
Not automatically under England’s landlord regulations. GOV.UK guidance says that if inspection/testing was carried out less than five years ago and the report does not require investigative or remedial work, a new inspection is not required solely because the premises are re-let. The current report must be given to the new tenant. GN3 professional guidance separately refers to change of occupancy.
IET Guidance Note 3 contains professional technical recommendations, including recommended initial inspection frequencies. England’s landlord regulations create separate legal duties. A GN3 recommendation should not automatically be described as a statutory requirement.
C1 means danger present: there is a risk of injury and immediate remedial action is necessary. A C1 observation makes the report unsatisfactory.
C2 means potentially dangerous. A foreseeable fault or situation could create danger and urgent remedial action is necessary. A C2 observation makes the report unsatisfactory.
No. C3 means improvement recommended. C3 on its own does not make the EICR unsatisfactory.
BS 7671:2018+A4:2026 changed FI to “Further investigation is advised” and FI by itself does not affect the overall satisfactory/unsatisfactory assessment on the A4 model form. Older A3-era forms and current landlord guidance may still use the older “required without delay” wording, so the form/edition and any separate statutory landlord duties need to be read carefully.
No, not simply because it is old. The inspector assesses condition, protective measures, risk and the installation as a whole.
No. A plastic enclosure alone does not automatically make an existing installation unsafe or an EICR unsatisfactory.
Not every older feature has to be upgraded simply because the latest edition contains newer requirements. The inspector assesses whether departures create immediate or potential danger and whether the installation is safe for continued use.
It is professional testing used to assess the condition of electrical insulation and detect unwanted leakage paths or deterioration that may not be visible during normal operation. Sensitive connected equipment must be properly considered.
It is a set of professional continuity/verification measurements used to assess the integrity and arrangement of a UK ring final circuit. It can reveal open conductors and abnormal interconnections that are not proven by a plug-in socket tester.
R1 is the resistance of the circuit Line conductor and R2 is the resistance of the circuit protective conductor. R1+R2 gives useful information about the fault path/protective conductor and is interpreted with other results.
Ze is external earth fault loop impedance at the origin; Zs is the earth fault loop impedance for a circuit. Both require interpretation in the context of the earthing arrangement and protective device.
A competent inspector uses appropriate test equipment and considers the RCD type, rating, application and measured performance. This guide intentionally does not provide step-by-step mains testing instructions.
There is no one correct time. It depends on property size, number of circuits/consumer units, access, condition, age, defects, alterations and the agreed inspection extent.
Temporary power interruption is normally required for parts of proper inspection and testing. Tell the inspector beforehand about critical equipment that needs planned shutdown or cannot be interrupted.
No. An EICR assesses the fixed installation; PAT/in-service equipment inspection relates to electrical equipment, plugs and flexible leads where appropriate.
It is not always legally required, but it can be useful where the electrical history is unknown, the installation is old, certificates are missing or alterations/extensions may have been carried out.
The person needs competence in periodic inspection and testing, including relevant technical knowledge, practical experience, test equipment and the ability to interpret results and classification codes. Scheme/qualification requirements can provide useful evidence of competence.
Ask about inspection/testing qualifications, practical EICR experience, current BS 7671/GN3 knowledge, independent registration/assessment where applicable, maintained test instruments, insurance and their ability to explain findings and abnormal readings.
The observations should be explained and appropriate remedial work planned. For covered landlords in England, required remedial/further investigative work is generally subject to a 28-day maximum or any shorter period specified as necessary in the report, with immediate danger treated urgently.
No. The reason may be one or several specific defects that can be repaired. A recommendation for full rewiring should be technically justified by the actual condition and extent of the installation.
AVAG Electrical Services Ltd provides professional electrical inspection and testing for homeowners, landlords, letting agents and property managers across London. Send the property postcode and a short description for the next step.
