Records the work
The certificate identifies the installation, client and extent of the work so future electricians and property owners can understand what was actually carried out.
Electrical Advice · Installation certification
Electrical Installation Certificate (EIC) – Complete Guide
Understand what an Electrical Installation Certificate is, when you should receive one, what electricians inspect and test, and how an EIC differs from an EICR, a Minor Works Certificate and Building Regulations notification.
BS 7671 certification explainedPart P / Building Regulations separated clearlyEngland-focused guidance
Assess → Install → Test → CertifyProfessional installation is more than a PDF
On this pageEIC complete guide
What is an EIC?When is an EIC used?What is actually tested?Why it is not paperworkBS 7671 Regulation 132.16Adding a new circuitConsumer unit replacementEIC vs EICREIC vs Minor WorksEIC vs Building RegulationsPart P / notificationOlder installationsFailed test resultsWho can issue an EIC?Lost certificatesFAQ
The document
What is an Electrical Installation Certificate?
An EIC is used to record certain new electrical installation work or significant alterations after the work has been designed, installed, inspected and tested.
Records verification
It contains inspection and test information relevant to the completed installation work rather than simply stating that something was fitted.
Records responsibility
EIC declarations relate to design, construction, inspection and testing. The exact signing arrangement depends on how responsibility for the work was organised.
i
BS 7671 is an important technical standard — not a statute by itself
Electrical installations are generally designed, installed, inspected and tested with reference to BS 7671, the IET Wiring Regulations. Legal duties can arise separately through legislation such as the Building Regulations, Electricity at Work Regulations and other requirements depending on the premises and work.
An EIC can include supply characteristics, earthing arrangements, protective devices, circuit schedules, conductor sizes, inspection outcomes, measured electrical test results and RCD/RCBO information. The point is not to create paperwork after the event; the certificate is the record of a verification process.
Typical scope
When is an EIC normally used?
The certificate depends on the work actually carried out. A full EIC is commonly associated with new installations, new circuits and substantial work.
New circuit
For example a new cooker, shower, EV charger, outbuilding, socket, lighting, air-conditioning or immersion-heater circuit.
Consumer unit
Replacement of a consumer unit/distribution board involves assessment and testing of the installation being transferred to the new protective equipment.
Rewiring
Full rewires and substantial partial rewiring involving new circuits normally require full inspection, testing and appropriate certification.
New installation
New electrical installations and significant extensions generally require the fuller design, construction and verification record provided by an EIC.
An EIC is not automatically required for every tiny electrical task.Smaller additions or alterations to an existing circuit may instead be appropriately recorded using a Minor Electrical Installation Works Certificate, depending on the work.
Professional workflow
The process is not “install it → print certificate”.
Professional electrical installation involves checking what the new work depends on, carrying out the installation, verifying the result and then issuing the correct documentation.
Relevant existing installation and suitability for the proposed work.
Carry out the agreed electrical installation correctly.
Inspect the completed work and accessible relevant equipment.
Carry out the electrical tests appropriate to the work.
Interpret the results and establish suitability to energise / put into service.
Complete and issue the appropriate BS 7671 certification.
Then, where the work is notifiable:BUILDING REGULATIONS NOTIFICATION → SEPARATE COMPLIANCE EVIDENCE
Inspection & testing
What does the electrician actually test?
The exact tests depend on the work and installation. The examples below show why an EIC should represent genuine electrical verification rather than a form completed from assumptions.
Protective conductor continuity
Checks that the protective conductors provide a continuous fault path where required. Equipment may still operate even when the protective conductor is defective.
Why it matters: fault protectionR1 + R2
R1 is the line-conductor resistance and R2 is the circuit protective-conductor resistance. Together they provide useful information about continuity of the circuit fault path.
Why it matters: continuity & fault pathRing final continuity
Ring final circuits may need end-to-end continuity assessment of line, neutral and CPC conductors. A broken ring can still leave every socket apparently working.
Why it matters: hidden open conductorsInsulation resistance
Assesses insulation between conductors. Poor values can be associated with damaged cables, moisture, deterioration or connected equipment affecting the measurement.
Why it matters: hidden insulation defectsPolarity
Confirms that line, neutral and switching arrangements are correctly connected so protective and switching devices operate in the intended conductor.
Why it matters: correct disconnectionZe
External earth fault loop impedance at the origin provides information about the external supply/earthing fault path and must be interpreted in context.
Why it matters: supply earthingZs
Earth fault loop impedance for a circuit is considered with the protective device to assess whether fault protection and required disconnection can be achieved.
Why it matters: automatic disconnectionProspective fault current
The available prospective short-circuit / earth-fault current is considered so protective devices have appropriate breaking capacity for the installation.
Why it matters: protective-device capabilityRCD / RCBO testing
Appropriate instrument testing is used to assess the operation of residual-current devices, together with their type, rating and intended protective function.
Why it matters: residual-current protectionFunctional testing
Relevant switches, isolators, RCD test functions, control equipment and other components may need functional verification where applicable.
Why it matters: complete operation!
These are professional tests, not DIY instructions
The correct test method depends on the circuit, equipment and installation conditions. This guide explains what is being verified and why; it does not provide step-by-step instructions for carrying out live or dead mains testing.
Verification
Why an EIC is not just paperwork
Testing can reveal defects that were invisible while the installation appeared to be working normally.
Continuity & circuit faults
- broken ring conductors
- missing CPCs
- borrowed neutrals
- incorrect circuit identification
Insulation & polarity faults
- low insulation resistance
- damaged conductors
- incorrect polarity
- previous unsafe alterations
Protection faults
- poor earthing or bonding
- defective RCD/RCBO
- excessive fault-loop impedance
- incorrect protective-device arrangements
Taking a measurement is only part of the job.Competence means understanding whether the result makes electrical sense, what it means for safety and what action is actually required.
BS 7671 Regulation 132.16
Can an electrician just add a new circuit to an existing installation?
No new electrical work should be treated as if it exists in isolation from the installation it is being connected to.
132.16
Check the relevant existing installation first
Before an addition or alteration is made, Regulation 132.16 requires the relevant existing equipment to be assessed so its rating and condition are adequate for the altered circumstances. Where the protective measure for the new work depends on earthing and protective bonding, those arrangements also need to be adequate.
In homeowner language: before adding something new, we cannot simply connect a cable, switch the power back on and issue a certificate. The relevant existing installation must first be assessed to make sure it can safely support the proposed addition or alteration.
Supply & distribution
- consumer unit / distribution equipment
- rating and condition of relevant equipment
- incoming supply arrangements where relevant
- meter tails / supply equipment where relevant
Earthing & bonding
- earthing arrangement
- main protective bonding where required
- continuity of protective conductors
- fault protection
Existing circuit
- protective devices
- conductor sizes
- polarity
- RCD/RCBO protection where applicable
Condition & alterations
- damage or deterioration
- previous alterations
- signs of overheating
- anything relevant to the safety of the proposed work
≠
This does not mean the whole old installation must be upgraded to 2026 standards
An existing installation is not automatically unacceptable because it was installed to an earlier edition of BS 7671. The relevant question is whether the existing equipment and protective arrangements upon which the new work relies are adequate for the proposed addition or alteration and the altered circumstances.
Practical example
Example: installing a new circuit
A cooker, shower, EV charger, air-conditioning, outbuilding or new socket circuit cannot be reduced to “fit breaker, run cable, connect equipment”.
Not the full process
- Install a new breaker
- Run a cable
- Connect the equipment
- Print an EIC
Professional approach
- Assess the consumer unit and available protective-device arrangement
- Establish relevant earthing, bonding and supply characteristics
- Confirm protective measures and RCD/RCBO requirements
- Coordinate conductor size, installation method and protective device
- Inspect and test the completed circuit
- Interpret the results before putting it into service
New electrical work should not be treated as completely separate from the installation it is being connected to.
Major example
Consumer unit replacement and certification
Replacing a consumer unit is not simply disconnecting an old box and reconnecting every existing circuit into a new one.
Before / during replacement
Relevant aspects of the existing installation need assessment and testing. This may uncover issues such as:
- broken ring final conductors
- missing CPCs
- borrowed neutrals
- incorrect polarity
- low insulation resistance
- inadequate earthing or bonding
- damaged wiring
- circuit identification problems
What it does not automatically mean
Finding an old installation, an older consumer unit or departures from the latest edition of BS 7671 does not automatically mean the whole property needs rewiring.
The electrician needs to assess actual condition, test results and whether any existing issue affects the safety of the proposed new work.
?
What if an existing defect is found and the customer does not want to repair it?
Not every unrelated defect automatically prevents every piece of new work. But if the new work relies on defective earthing, bonding, protection or another condition that makes the proposed addition unsafe, the electrician cannot simply ignore it and certify the new work as though the relevant existing installation were adequate. The safe options depend on the defect and agreed scope: remedial work may be required, the design may need to change, or the affected work may need to remain disconnected / not be commissioned until the safety issue is resolved.
Do not confuse the documents
EIC ≠ EICR
EIC
Electrical Installation Certificate
Primarily records certain newly completed installation work or significant alteration and the inspection/testing of that work.
- new work
- design / installation
- inspection
- testing
- certification
EICR
Electrical Installation Condition Report
Assesses the condition and safety of an existing electrical installation at the time of periodic inspection.
- existing installation
- deterioration
- defects
- condition
- safety for continued use
An EIC is not a replacement for an EICR — and an EICR is not normally the certificate used to certify newly completed installation work.
Smaller alterations
EIC vs Minor Electrical Installation Works Certificate
The Minor Electrical Installation Works Certificate (MEIWC) is intended for certain additions or alterations that do not extend to providing a completely new circuit.
Full EIC
Commonly used for new circuits, new installations, consumer unit replacement and substantial electrical installation work where the fuller design/construction/verification record is appropriate.
Minor Works Certificate
May be appropriate for smaller additions or alterations to an existing circuit — for example certain socket or lighting alterations — depending on the exact scope.
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Replacing a standard socket or switch does not automatically mean a full EIC is required
The correct documentation depends on what was actually done to the electrical installation. A simple accessory replacement is not the same as installing a new circuit or substantially altering an installation.
Very important distinction
EIC vs Building Regulations Compliance Certificate
These documents are related on some domestic jobs in England, but they are not the same document and they prove different things.
Electrical Installation Certificate
Records the electrical installation work and its design / construction / inspection / testing declarations and results.
BS 7671 certificationBuilding Regulations Compliance Certificate
Provides evidence that qualifying notifiable work has been notified / self-certified under the Building Regulations route where applicable.
Building Regulations evidenceAn EIC and a Building Regulations Compliance Certificate are not the same document.Receiving an EIC does not, by itself, prove that a separate Building Regulations notification has been completed.
Practical AVAG experience
I have personally come across situations where homeowners had an EIC but no corresponding Building Regulations notification appeared to have been completed for work that should have been notified.
This can become visible much later — for example during a property sale, when a solicitor asks for evidence, during mortgage enquiries, or when a future electrician checks the installation history. The point is not to criticise another contractor; it is to help customers understand exactly which documents they should expect.
England · Building Regulations
Part P and notifiable electrical work
Part P / Building Regulations compliance and BS 7671 electrical certification are connected, but they are separate processes.
Examples specifically listed as notifiable
EnglandApproved Document P identifies installation of a new circuit, replacement of a consumer unit, and additions or alterations to existing circuits in defined special locations as notifiable electrical installation work.
Competent person route
Self-certification where eligibleA contractor registered for the relevant Competent Person Scheme scope can normally notify qualifying work through the scheme rather than the homeowner separately arranging Building Control approval.
✓
What should the customer receive?
For electrical installation work, the installer should provide the appropriate BS 7671 certificate (EIC or MEIWC depending on the work). Where the work is also notifiable under Building Regulations and is self-certified through an appropriate scheme, the customer should additionally receive the separate Building Regulations Compliance Certificate.
NAPIT’s current consumer guidance makes this distinction explicitly: a BS 7671 EIC/MEIWC is provided for electrical installation work, and where work in England or Wales must also be notified under Building Regulations, a separate BRCC should follow.
Balanced assessment
What if the existing installation is old?
Age is information, but age by itself is not an electrical test result.
Old wiring ≠ automatically unsafe
An installation can have been designed to an earlier edition of the Wiring Regulations and still remain serviceable, subject to its condition and protective arrangements.
Old consumer unit ≠ automatic rewire
An older fuse board can justify assessment or improvement, but it does not by itself prove that every cable in the property needs replacing.
Condition matters
Deterioration, damaged accessories, inadequate protection, earthing/bonding issues and repeated poor alterations are more meaningful than the date printed on equipment alone.
When something is wrong
What if a circuit fails testing?
A failed or abnormal result is a reason to identify the problem — not automatically to declare that the whole property needs rewiring.
Abnormal result→Interpret→Fault find / investigate→Repair or redesign→Retest
Depending on the issue, the next step may be fault finding, further investigation, repair, circuit alteration, replacement of a defective accessory/protective device, or disconnection where an item is genuinely unsafe. The correct response should be proportionate to the actual defect.
Responsibility
Who can issue an EIC?
Electrical certification requires competence in installation, inspection, testing and interpretation — not merely access to certificate software.
Electrical competence
Knowledge of BS 7671, installation methods, protective measures, inspection, test equipment and the ability to interpret electrical results.
Scheme registration
Registration is relevant where a contractor uses a Competent Person Scheme to self-certify qualifying Building Regulations work. It is not the same concept as simply being electrically competent.
AVAG
AVAG Electrical Services Ltd is NAPIT registered (Member No. 84276) and provides appropriate electrical certification for the work undertaken within our scope.
✎
Can an electrician certify someone else’s work?
An electrician should not simply sign another person’s work as though they personally carried responsibility for it. The correct certification route depends on who designed, installed, inspected and tested the work, how responsibility was managed, and any separate Building Regulations route. Third-party Building Regulations certification is itself a specific scheme activity and should not be confused with casually signing an EIC after the event.
Missing paperwork
What if the EIC is lost?
The first step is usually to contact the original contractor and request a copy from their records.
Do
- contact the original installer
- check emails / handover documents
- check scheme / Building Regulations records if notification is relevant
- keep copies with the property electrical records
Do not assume
A different electrician should not simply create a brand-new EIC retrospectively as though they carried out and took responsibility for the original installation work. Depending on the reason the document is needed, inspection of the existing installation may be appropriate — but an EICR is not automatically a replacement for a lost original EIC.
Common misunderstandings
Five things worth checking
Certificate names sound similar, which is why property owners often discover years later that they have a different document from the one they expected.
Myth“EIC and EICR are the same thing.”
Fact
No. One primarily certifies certain completed installation work; the other assesses the condition of an existing installation.
Myth“If I have an EIC, Building Regulations notification must be done.”
Fact
Not necessarily. BS 7671 certification and Building Regulations notification are separate processes.
Myth“Every socket replacement needs a full EIC.”
Fact
No. The appropriate certificate depends on the actual extent and type of work.
Myth“Old consumer unit means full rewire.”
Fact
No. Condition, protective measures and electrical test results are what determine the technical position.
Myth“Certification is just paperwork.”
Fact
Proper certification is the record of design / construction / inspection / testing and professional interpretation of the results.
Myth“Everything old must be upgraded before any addition.”
Fact
Regulation 132.16 focuses on whether the relevant existing installation and protective arrangements are adequate for the altered circumstances — not on automatically modernising the entire property.
Frequently asked questions
Electrical Installation Certificate FAQ
Short answers to the questions homeowners, landlords and buyers commonly ask about EIC documentation.
What is an Electrical Installation Certificate?
An EIC is a BS 7671 electrical certificate used to record certain new electrical installation work or significant alterations together with the relevant design, construction, inspection and testing declarations and results.
When do I need an EIC?
It is commonly used for new electrical installations, new circuits, consumer unit replacement, rewiring and other substantial work. The correct certificate depends on the exact work undertaken.
Do I need an EIC after replacing a consumer unit?
Consumer unit replacement normally requires an Electrical Installation Certificate because the work affects the distribution and protection of existing circuits and needs appropriate inspection and testing. In a dwelling in England, consumer unit replacement is also listed as notifiable work under Approved Document P.
Do I need an EIC for a new circuit?
Yes, a new circuit is the type of work for which an EIC is normally used. In domestic premises in England, installation of a new circuit is also notifiable under the Building Regulations route.
Is an EIC the same as an EICR?
No. An EIC primarily records certain newly completed installation work. An EICR assesses the condition of an existing electrical installation.
Is an EIC the same as a Part P certificate?
No. “Part P certificate” is often used informally to refer to Building Regulations compliance evidence. The EIC is the BS 7671 electrical installation certificate; Building Regulations notification/compliance is a separate process where applicable.
Is an EIC the same as a Building Regulations Compliance Certificate?
No. The EIC records electrical installation work and verification. A Building Regulations Compliance Certificate relates to qualifying notifiable building work and its notification/self-certification route.
I have an EIC. Does that mean the work was notified to Building Control?
Not necessarily. An EIC and Building Regulations notification are separate processes. If the work was notifiable, there should also be appropriate evidence that the Building Regulations notification was completed.
Do I need an EIC for replacing a socket?
Not automatically. A simple like-for-like accessory replacement is not the same as installing a new circuit. If the work involves an addition or alteration to an existing circuit, a Minor Electrical Installation Works Certificate may be appropriate depending on scope.
What is a Minor Electrical Installation Works Certificate?
It is a BS 7671 certificate intended for certain additions or alterations to an existing installation that do not extend to providing a new circuit. It records the work and relevant verification without using the full EIC format.
What happens if a circuit fails testing?
The result should be interpreted and the cause identified. The next step may be fault finding, repair, redesign, replacement of defective equipment or further investigation. A failed result does not automatically mean a full rewire.
Can an electrician add a new circuit if the existing installation has defects?
It depends on whether those defects are relevant to the proposed work and protective measures. Regulation 132.16 requires the relevant existing equipment, earthing and bonding arrangements to be adequate for the altered circumstances. An unrelated older feature is not automatically a reason to stop all work, but a defect that makes the new work unsafe cannot simply be ignored.
Can another electrician certify previous work?
They should not simply sign as though they carried out work for which they did not take appropriate responsibility. The correct route depends on design, installation, inspection/testing responsibilities and any separate Building Regulations arrangements.
What should I do if I have lost my EIC?
Contact the original contractor and ask for a copy. If Building Regulations notification was involved, check the relevant scheme/Building Control records as well. A different electrician should not simply recreate the original EIC retrospectively.
How long should I keep an EIC?
Keep it with the property’s electrical records for the long term and pass it on when useful to future owners, landlords or electricians. It can be important evidence of what work was completed and what was tested.
Can I sell my house without an EIC?
A missing EIC does not automatically make a property impossible to sell, but solicitors, buyers or lenders may ask for evidence relating to electrical work and Building Regulations notification. If documentation is missing, the appropriate next step depends on the work and circumstances.
Need electrical installation work or certification?
AVAG Electrical Services Ltd carries out electrical installation, inspection and testing and provides the appropriate certification for the work undertaken. If you are unsure whether you need an EIC, Minor Works Certificate, EICR or Building Regulations notification, contact us and we can explain what is appropriate for the work.
General information / England: This guide explains electrical certification and Building Regulations principles in general terms. The correct certificate and notification route depend on the actual work, premises and responsibilities involved. BS 7671 is an important technical standard but is not itself a statute. Building Regulations duties are separate. Every installation and alteration should be assessed by a competent person for its actual circumstances.