What we know about 18th Edition Amendment 4 so far
The public consultation on Amendment 4 (2026) of the IET Wiring Regulations (BS 7671:2018) has now closed.
The amendment, known as Amendment 4, has long been scheduled and is set to incorporate changes to harmonised standards at European level, which the UK must adopt within a certain time period.
It is intended that this amendment will include requirements for stationary secondary batteries, low voltage generating sets, power over ethernet (POE), energy efficiency, and functional earthing and functional equipotential bonding for information and communication technology (ICT) equipment and systems. Each area of change comes in response to fast-evolving technologies.
Amendment 4 is expected to be published in 2026; until that time, electrical installers must have access to the latest Amendment 2 (2022) – the ‘brown book’ – and Amendment 3 (2024), which is a free PDF bolt-on.
NICEIC will continue to update this page as and when further information about Amendment 4 is released.
We will of course be on hand to support our certified businesses through this transition across 2026 and beyond.
Amendment 4 timeline
January 2026
Pre-order period starts
Pre-orders available for 18th Edition Amendment 4 publications and training courses.
Date TBC
Amendment 4 release date
Official release date of the latest update to the 18th Edition wiring regulations.
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