BS 7671:2018+A4:2026 18th Edition Wiring Regulations – Amendment 4
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The latest update to the national standard for electrical installations has arrived.
BS 7671:2018+A4:2026 (Amendment 4) comes into effect on 15th April 2026. If you design, install, inspect or verify electrical installations in the UK, this update directly affects you.
We are now accepting pre-orders for the full range of Amendment 4 publications.
Why Amendment 4 Matters
The IET Wiring Regulations (BS 7671) set the benchmark for electrical installation safety across the UK. Amendment 4 introduces important technical updates and revisions to ensure installations remain safe, compliant and aligned with evolving industry practice.
From domestic installations to commercial and industrial projects, compliance with the latest edition is essential for:
- Electrical contractors
- Designers and consultants
- Inspectors and testers
- Training providers and colleges
- Certification bodies and scheme members
- The new standard becomes effective immediately on 15th April 2026.
Make sure you are working to the correct version.
Pre-Order Now – Guaranteed Best Prices
Don’t miss the most competitive deal on Amendment 4.
We guarantee to beat NICEIC and NAPIT member prices, with:
- ✅ FREE UK Mainland delivery
- ✅ Fast dispatch on release
- ✅ Secure online ordering
- ✅ Telephone support from a knowledgeable UK team
All pre-orders placed before 15th April 2026 qualify for our launch price.
Order online today or call 01380 820 003. We can’t be beaten on service. We won’t be beaten on price.
Available Publications
The full range of BS 7671:2018+A4:2026 publications is available to pre-order, including:
What Has Changed in Amendment 4?
Amendment 4 builds upon the 18th Edition framework, introducing refinements and updates to support improved safety, clarity and consistency in electrical installations.
For a full breakdown of the technical updates, we recommend reviewing the official IET overview.
Watch: Amendment 4 Explained
Frequently Asked Questions
When does Amendment 4 come into effect?
BS 7671:2018+A4:2026 becomes effective on 15th April 2026.
Do I need to buy a new copy?
If you are working to the current edition of BS 7671, you will need Amendment 4 to ensure you remain compliant with the latest national standard.
Is Amendment 4 mandatory?
BS 7671 is not statutory law, but it is recognised as the national standard for electrical installations in the UK and is widely adopted for compliance with the Electricity at Work Regulations.
Will there be a transition period?
The effective date is 15th April 2026. Always check scheme provider guidance regarding implementation expectations.
Do you offer discounts for bulk orders?
Yes. We offer competitive pricing on bulk and training provider orders. Please call 01380 820 003 for a tailored quote.
When will pre-orders be dispatched?
Pre-orders will be dispatched as soon as stock is released, with FREE UK Mainland delivery.