Fuse Board / Consumer Unit Upgrade London — BS 7671 Compliant

Common triggers: an EICR with multiple C2 codes that can't be remedied at circuit level, a board pre-dating the 17th edition (pre-2008), a board with no RCD protection, plastic-bodied units that fail the EICR fire-resistance test, or to support an EV charger or home battery install.

A typical 6–12 way domestic upgrade is a one-day job — 4–6 hours on site. Power is off for most of that. Larger or commercial boards are quoted on survey.

Type AC only detects AC fault current. Modern appliances (induction hobs, EV chargers, LED drivers) create DC fault components that Type AC cannot reliably detect — so they cannot guarantee 30 mA protection. BS 7671 Amendment 4:2026 makes Type A the default for any installation with DC-capable loads.

Most central London supplies are underground so direct lightning strikes are rare. But indirect transient surges from grid switching, EV chargers, home batteries and certain LED drivers are common — SPD costs roughly £80 of the board build and protects expensive electronics. We install it as standard.

Arc Fault Detection Devices detect series arc faults — a leading cause of electrical fires. Under BS 7671 A4:2026, AFDD is mandatory on socket circuits in HMOs, care homes and schools, and recommended in private dwellings. We add AFDD on request (+£35 per circuit).

Yes — full NICEIC installation certificate, accepted by every London letting agent, insurer and council we work with. EICR codes on the rest of the installation can be done on the same visit if you need both certificates.