Best Consumer Units for UK Homes in 2026: The Electrician's Guide

Consumer units are one of the most regularly specified items in domestic electrical work — and since Amendment 3 of BS 7671 came into force, the spec requirements have changed significantly. This guide covers what electricians need to know about consumer unit compliance in 2026: metal vs plastic enclosures, main switch vs RCBO boards, split-load configurations, and the specific units we stock at APM Electricals in Acton, West London.

Amendment 3 Compliance — What Changed and Why It Matters

Amendment 3 to the 18th Edition of BS 7671 (IET Wiring Regulations) introduced a requirement for arc fault detection devices (AFDDs) in specific high-risk locations in domestic premises — notably sleeping accommodation. This affects new installations and significant alterations to existing circuits in those locations.

The practical implication for most domestic jobs: if you're installing a new consumer unit in a house with bedrooms, circuits serving those bedrooms will require AFDD protection. The most straightforward way to comply is to use a consumer unit that accepts AFDD modules on individual ways, or to fit dedicated AFDD circuit breakers.

Additionally, Amendment 3 maintained the requirement (introduced with Amendment 2 in 2015) that consumer unit enclosures in domestic premises must be non-combustible. Plastic consumer units are not compliant for new domestic installations — metal enclosures are required.

Metal vs Plastic Enclosures — Not Optional Anymore

The non-combustible enclosure requirement catches out a surprising number of tradies who've been sourcing plastic units for years. To be clear: for any new consumer unit installation or replacement in a domestic dwelling, the enclosure must be metal (or other non-combustible material). Plastic enclosures fail this requirement.

Metal-clad units are now the default. They're also more robust for trade work — better cable entry management, more durable terminals, and a professional finish that satisfies inspection.

The MK Sentry Amendment 3 All Metal 12 Way Consumer Unit is a strong choice for standard domestic installs. It's Amendment 3 ready, accepts AFDD modules, and comes with a 100A main switch disconnector. The build quality is typical of MK — terminals are solid, labelling is clear, and the busbar accepts both MCBs and RCBOs without adapters.

Main Switch vs RCBO Board — Which Configuration?

Consumer units come in two main protection configurations:

Main Switch (with RCDs)

A traditional split-load board has a main switch isolator plus one or two RCD blocks covering groups of circuits. This is a lower cost option and works well for straightforward installs. The limitation: if one RCD trips (due to a fault on any of its protected circuits), all circuits on that RCD lose supply. Tracing an intermittent fault can involve taking down the whole ring main or lighting circuit while you isolate.

The consumer units collection includes a range of main switch boards suitable for standard domestic upgrades. The Axiom 12 Way 100A Main Switch Consumer Unit is a cost-effective option for a straightforward rewire or upgrade where budget is a primary consideration.

RCBO Board (Individual Protection per Circuit)

An RCBO board replaces the group RCDs with individual RCBOs on each circuit. Each circuit gets its own combined overcurrent and RCD protection. When a fault trips a single circuit, everything else stays on. This is the preferred configuration for most electricians doing quality domestic work — better for the customer, cleaner fault finding, and no cascading outages.

RCBO boards cost more per way than split-load boards, but the labour saving on fault calls often offsets this within the first year. They're increasingly the default spec for full rewires and consumer unit upgrades in higher-specification domestic properties.

12-Way vs 18-Way — Planning Ahead

A 12-way board covers a standard 3-bed semi comfortably: ring main, radial, upstairs lighting, downstairs lighting, cooker, immersion, and a couple of spare ways. If you're future-proofing for EV charging, heat pump circuits, or a garage/workshop sub-board, go to 18 ways from the start. Retrofitting a larger board later costs significantly more than upsizing at time of install.

Outbuildings and Garages — Dedicated Units

For outbuilding sub-distribution, a dedicated garage or shed consumer unit is the right tool. These are designed for small sub-boards with limited ways, often IP65 rated for damp environments. The FuseBox F100GRA Garage Consumer Unit is a well-priced option for garage and outbuilding installs — dual RCD protection, 100A main switch, and compact form factor suitable for a garage wall mount.

What We Stock at APM Electricals, Acton

We carry a full range of consumer units and circuit breakers from MK Electric, Axiom, FuseBox, and other major brands — available for same-day trade counter collection at 24 Western Avenue, Acton, London W3 7TZ. Open 7 days. Call 020 8702 8080 to confirm stock on specific configurations or to discuss a project requirement.