Understanding BS 7671:2018 + Amendment 4:2026 IET update

Prepare your business Amendment 4 release date Supporting your business Publications and training FAQs

Prepare your business for 18th Edition Amendment 4

The IET and BSI have confirmed that Amendment 4 (2026) to BS 7671:2018 (the 18th Edition of the IET Wiring Regulations) will be published on 15 April 2026. Businesses will be able to implement the amendment immediately upon publication and the previous version, BS 7671:2018 + A2:2022 + A3:2024, will be withdrawn six months later. Amendment 4 will then become the definitive British Standard for all new low-voltage electrical installations, modifications to existing systems, and periodic inspection and testing.

Significant changes include:

a new chapter on stationary secondary batteries where the purpose is for electrical storage and supply of electrical installations.
a new section on functional earthing and functional equipotential bonding for information and communication technology (ICT) equipment and systems.
a new section on power over ethernet (PoE).
a major revision of Section 710 Medical Locations and the inclusion of a schedule of test results for recording the resistance of supplementary protective equipotential bonding conductors.

Amendment 4 can be implemented immediately when published on 15 April 2026. Businesses will need to have access to the current version of the Wiring Regulations to continue to comply with scheme requirements.

Pre-order Amendment 4 courses and publications

18th Edition Amendment 4 release date

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How NICEIC is supporting your business

NICEIC will be on hand to support your business in the transition to Amendment 4 with a whole host of exclusive free resources, CPD opportunities, and events throughout 2026.

The Wire webinar: BS 7671: how its produced

Date: 12 March 2026
Time: 20:00

In this episode, we will be joined by the IET to uncover the process behind the publication of the UK’s key electrical standard, BS 7671.

We will explain how the standard is developed and maintained in alignment with European and global standards, and how it incorporates requirements for new technologies and developments in equipment and products.

The Wire webinar: Amendment 4: part 1

Date: 16 April 2026
Time: 20:00

In the first instalment of our special The Wire series on Amendment 4, NICEIC’s experts will take you through the main changes introduced by the latest amendment to the 18th Edition of BS 7671.

Tune in and find out all the information you need to ensure your business stays compliant.

The Wire webinar: Amendment 4: part 2

Date: 20 April 2026
Time: 13:00

Continuing our special The Wire series on Amendment 4, in part 2, we’ll delve deeper into the implications of the updated BS 7671 regulations for electrical contractors and businesses.

Join us for insightful discussion, guidance, and tips to help you navigate this transitional phase with confidence.

The Wire webinar: Amendment 4: part 3

Date: 27 April 2026
Time: 13:00

In part 3, we'll broaden the discussion to cover a range of topics relevant to Amendment 4 and the wider electrical industry.

Building on the ideas presented in earlier episodes, NICEIC experts will offer general guidance and practical advice to help businesses navigate the changes.

The Wire webinar: Amendment 4: part 4

Date: 30 April 2026
Time: 20:00

The final instalment of our series brings together the essential insights and lessons from parts 1 to 3, offering a forward-looking perspective on Amendment 4 and its long-term impact.

Our experts will recap the main points, address frequently asked questions, and provide guidance on maintaining compliance as the regulatory environment continues to evolve.

NICEIC TechLive Surrey

Date: 11 June 2026
Time: 11:00

Join us at NICEIC TechLive Surrey, taking place at Mercedes-Benz World in Weybridge on Thursday 11 June 2026. We’ll be dedicating a full CPD-accredited session to Amendment 4, its implications for businesses, and how to stay compliant.

Our TechLive events are a great space to speak to our experts face-to-face and get support, advice and guidance on navigating the latest electrotechnical developments.

NICEIC TechLive Sheffield

Date: 30 September 2026
Time: 11:00

Come along to NICEIC TechLive Sheffield, taking place at Magna in Rotherham, on Tuesday 30 September 2026. We’ll be hosting a comprehensive talk focused on Amendment 4, exploring its impact on businesses and the best ways to maintain compliance.

Our TechLive events offer an excellent opportunity to engage directly with our experts and keep up to date with the latest developments in the electrotechnical sector.

Catch us at ElexShow and InstallerSHOW

Got a question about Amendment 4 and want guidance personalised to your business? Our experts will be at all six ELEX shows taking place across the country in 2026, as well as Birmingham’s InstallerSHOW in June 2026 – so if you’re coming along, grab one of us for a chat and some tailored support.

See all events

Amendment 4 publications and training

Amendment 4 publications

Head to the NICEIC online shop for your 18th Edition Amendment 4 Wiring Regulations book and accompanying guides. Pre-order today and stay ahead.

Pre-order Amendment 4 publications

*Offer applies to NICEIC-certified businesses only (access your discount code in the customer portal). Offer ends 14th April.

Includes a free digital guide

Amendment 4 training and qualifications

Book your 18th Edition Amendment 4 training course today. Whether you’re looking to top up your knowledge or get qualified, save 15% when you pre-book.

Book your Amendment 4 training

**Discount will be applied automatically and cannot be used in conjunction with any other discount codes or offers. Offer ends 14th April.

Amendment 4 certificates and reports

All digital and paper certificates and reports will be updated in alignment with Amendment 4 upon publication. You’ll be able to access these through the NICEIC online shop and the NICEIC Online Certification System from April 2026.

Available from April 2026

18th Edition Amendment 4 FAQs

Amendment 4 to the 18th Edition of the IET Wiring Regulations will come into effect on 15 April 2026. The amendment can be implemented immediately from this date and the previous version, BS 7671:2018 + A2:2022 + A3:2024, will be withdrawn six months later.

BS 7671:2018 + Amendment 4:2026 is an essential update to the 18th Edition of the IET Wiring Regulations, the key British Standard governing electrical installations. Amendment 4 continues the thread of embracing new technologies to the Wiring Regulations, in addition to amending or extending some existing elements.

There have been three previous amendments to the 18th Edition of the IET Wiring Regulations; this will be the fourth such amendment. It constitutes the most notable update to the Regulations since Amendment 2 was published in 2022.

There are several changes coming in Amendment 4, including:

a new chapter on stationary secondary batteries where the purpose is for electrical storage and supply of electrical installations.
new section on functional earthing and functional equipotential bonding for information and communication technology (ICT) equipment and systems.
a new section on power over ethernet (PoE).
a major revision of Section 710 Medical Locations and the inclusion of a schedule of test results for recording the resistance of supplementary protective equipotential bonding conductors.

Read about the changes in full at theiet.org

Yes, your business will need to have access to the new 18th Edition book incorporating Amendment 4. This is a requirement for any certified business to comply with scheme requirements.

Yes, if you’re looking for a refresher or to familiarise yourself with the updates brought in by Amendment 4, you can find and book 18th Edition training courses that aren’t formal qualifications on the NICEIC online shop. This would make ideal CPD and contribute towards the essential CPD required by your certification scheme.

Your digital guide comes free with the purchase of any 18th Edition training course on the NICEIC online shop. Simply add your chosen course to the basket, head to the checkout and you should see your free guide in your basket along with your purchase - depending on what course you're purchasing, this will be a digital copy of either our NICEIC Site Guide, or NICEIC Learner Guide. Your digital guide will be sent to you from 15 April 2026 along with any other Amendment 4-related items you pre-order.

A copy of the BS 7671:2018 + Amendment 4:2026 IET Wiring Regulations costs £125.00 on the NICEIC online shop. If you’re an NICEIC-certified business, you can get 10% off all pre-orders of the book using the discount code in your customer portal up until 14 April 2026.

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Understanding BS 7671:2018 + Amendment 4:2026 IET Wiring Regulations update