Amendment 4 (2026) to BS 7671:2018 IET Wiring Regulations

The UK electrical industry is evolving rapidly as buildings become more energy-efficient, technologically complex, and increasingly integrated with low-carbon systems. At the centre of this transformation is BS 7671,the IET Wiring Regulations, which continue to provide the national framework for safe and effective electrical installation.The forthcoming 18th Edition Amendment 4 marks the next major step in ensuring electrical installations remain safe, reliable, and aligned with modern energy and technology demands. While previous amendments focused on targeted improvements, Amendment 4 reflects a broader shift across the industry—driven by the growth of renewables, heat pumps, electric vehicles, digital infrastructure, and smart energy systems.For installers, designers, engineers and new entrants to the sector, this amendment is less about memorising new rules and more about understanding the realities of contemporary electrical environments. Amendment4 supports a future where electrical systems must integrate energy storage, manage data-rich technologies, and operate safely within increasingly interconnected buildings.