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

The UK electrical industry is evolving rapidly as buildings becomemore energy-efficient, technologically complex, and increasingly integratedwith low-carbon systems. At the centre of this transformation is BS 7671,the IET Wiring Regulations, which continue to provide the national frameworkfor safe and effective electrical installation.The forthcoming 18th Edition Amendment 4 marks the next major stepin ensuring electrical installations remain safe, reliable, and aligned withmodern energy and technology demands. While previous amendments focused ontargeted improvements, Amendment 4 reflects a broader shift across the industry—drivenby the growth of renewables, heat pumps, electric vehicles, digitalinfrastructure, and smart energy systems.For installers, designers, engineers and new entrants to thesector, this amendment is less about memorising new rules and more aboutunderstanding 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 increasinglyinterconnected buildings.