Minor Works vs EIC — Which Certificate Do I Need?

Choosing between a Minor Electrical Installation Works Certificate and a full Electrical Installation Certificate (EIC) is one of the most common questions UK electricians face on site. The answer is always determined by one question: have you installed a new circuit?

If the work involves running a new cable from the distribution board with a new protective device (MCB, RCBO, or fuse), you are installing a new circuit and a full EIC is required. If the work is an addition or alteration to an existing circuit — without creating a new one — a Minor Works certificate is the correct document.

This distinction is set out in BS 7671 Part 6. Part 6 requires an EIC for new installations and additions or alterations that include new circuits, and a Minor Works certificate for additions or alterations to existing circuits that do not extend to the installation of a new circuit.

There is also a practical option for jobs involving multiple circuit alterations: a single EIC may be used as an alternative to issuing multiple Minor Works certificates, where the work does not extend to new circuits. This follows from the Appendix 6 guidance on the use of the model forms rather than from Regulation 120.3, which deals with departures from the Regulations — worth knowing if a scheme assessor asks you to cite it.

Getting this right matters. Issuing the wrong certificate can result in scheme provider disciplinary action, building control complications, and potential liability issues. This guide covers the clear-cut cases, the grey areas, and practical examples from real site work.

A Minor Electrical Installation Works Certificate is used for additions or alterations to an existing circuit that do not involve the installation of a new circuit. The work must still comply fully with BS 7671, and proper inspection and testing must be carried out — the term "minor" refers to the scope of the electrical work, not its importance.

Common examples of work requiring a Minor Works certificate:

• Adding a socket outlet to an existing ring final circuit — for example, installing a new double socket in a living room by spurring from an existing socket
• Extending a lighting circuit — adding a new light point or light switch to an existing lighting circuit
• Installing a fused connection unit (FCU) to supply a fixed appliance (such as a towel rail, extractor fan, or waste disposal unit) from an existing circuit
• Repositioning an existing accessory — moving a socket outlet or light switch to a different location on the same circuit
• Replacing an RCBO or MCB on an existing circuit — swapping a protective device on an existing circuit (not a full consumer unit replacement). This is an alteration to an existing circuit; a Minor Works certificate is appropriate
• Installing a fused spur from an existing ring or radial circuit to supply a fixed appliance

It is important to note that a like-for-like replacement of accessories (swapping a socket for an identical one in the same position) does not require any certificate, provided you verify CPC continuity and polarity.

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EIC Form: Minor Works vs Full Certificate

EIC form confusion costs time on site. Compare minor works certificates against full EICs under BS 7671:2018+A4:2026.

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An Electrical Installation Certificate is required whenever a new circuit is installed. The defining characteristic is that a new protective device has been added to the distribution board to protect a new cable run. This applies whether the property is new-build, existing domestic, commercial, or industrial.

Common examples of work requiring an EIC:

• New radial circuit for an electric shower — a dedicated circuit from the consumer unit, typically 10 mm cable on a 40A or 45A MCB
• New dedicated cooker circuit — a separate circuit from the board for a new cooker or hob installation
• Complete or partial rewire — replacing all or some of the existing wiring with new circuits
• New ring final circuit for an extension — extending the property with new rooms that need their own circuits
• EV charger installation — typically a new 32A dedicated radial circuit from the consumer unit
• New garden or outbuilding supply — a new circuit from the main board to supply a shed, workshop, or garden room
• New-build installations — first-fix and second-fix of a brand new property
• Solar PV installation — a new circuit for the inverter and generation meter

The EIC has three signature blocks — designer, constructor, and inspector — reflecting the greater scope and complexity of new circuit work. On domestic jobs, one person typically fulfils all three roles. The EIC also includes a full schedule of inspections and schedule of test results for every new circuit.

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Full EIC with Three Signature Blocks

Elec-Mate includes the complete EIC form with all three signature blocks, schedule of inspections, and schedule of test results.

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Theory is straightforward, but real site work throws up scenarios that are not always clear-cut. Here are practical examples based on common jobs.

The choice between Minor Works and EIC also intersects with Part P of the Building Regulations (Approved Document P), which governs electrical safety in dwellings in England and Wales. Understanding which work is notifiable helps you comply with building regulations as well as BS 7671.

If you are registered with a competent person scheme (NICEIC, NAPIT, ELECSA, STROMA, or BRE), you can self-certify notifiable work by submitting the relevant BS 7671 certificate to your scheme provider. They issue a Building Regulations Compliance Certificate on your behalf. If you are not registered with a scheme, you must notify building control before starting any notifiable work, and they will inspect and approve the completed work.

Scheme inspectors consistently flag the same certification errors. Avoiding these mistakes saves time, protects your scheme membership, and demonstrates professionalism.

While the "new circuit = EIC, existing circuit alteration = Minor Works" rule covers most situations, several edge cases create genuine ambiguity.

Elec-Mate includes both the Minor Works and EIC forms — along with 6 other certificate types — in one app. All forms follow the BS 7671 Appendix 6 model form structure and include auto-fill, digital signatures, test result validation, and professional PDF export.

When you start a new certificate in Elec-Mate, the app asks about the scope of work. Based on your answers — are you installing new circuits, altering existing circuits, or inspecting an existing installation — it guides you to the right certificate type. This helps avoid the most common mistake of issuing the wrong form.

For the Minor Works certificate, Elec-Mate auto-fills your company details and scheme registration number, provides description templates for common types of minor work, and validates all test results against BS 7671 limits. The certificate is complete in under 3 minutes for a routine job.

For the EIC, the app supports all three signature blocks, the full schedule of inspections, and the complete schedule of test results. Values are validated as you enter them, and the app flags incomplete fields before you sign off.

All 16 certificate types in Elec-Mate: EIC, Minor Works, EICR, Emergency Lighting, Fire Alarm, PAT Testing, EV Charger, and Solar PV. One subscription covers every certificate an electrician needs.

Elec-Mate's digital certificates comply with BS 7671 Reg 644.4.202, which explicitly permits certificates to be produced in any written or electronic form, provided their authenticity and integrity are verified by a reliable process or method. Every certificate generated in Elec-Mate meets this requirement — giving you fully regulation-compliant digital documentation, not just a PDF copy.

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All 16 Certificate Types in One App

Stop guessing which certificate to use. Elec-Mate guides you to the right form based on the scope of work.

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