Fuse Box / Consumer Unit Replacement Brent Cross

Brent Cross West regen and Claremont Way developments — and the Hendon Waterside Barratt flats — were almost all wired with developer-spec 12-way dual-RCD boards between 2014 and 2021. The board passes its initial EICR, but the spec is sized to the developer's day-one circuit count with zero realistic headroom. Add an EV charger (the basement bays now usually allow them), a heat pump retrofit, or a smart-lighting hub and you hit the spare-ways limit fast. The replacement isn't fixing anything broken — it's giving you the capacity to add what the original developer didn't plan for.

Compliant at install — yes, the dual-RCD pattern met BS 7671 17th and early 18th Edition rules in force when Brent Cross West and Hendon Waterside were energised. It still meets the minimum standard today. What changed is what BS 7671:2018+A2:2022 considers best practice: a fault on any circuit on a 30 mA RCD takes down every circuit on that RCD. On a 12-way dual-RCD board, that's typically 5-6 circuits losing power for one fault. Full-RCBO (one device per circuit) is now the standard for a same-spec replacement and what the block's electrical consultants will specify on any post-2024 build at Brent Cross Town.

Not compliant. Tapping an EV charger off the meter tails — between the cutout and the consumer unit — bypasses the board's protection, isn't part of any certified circuit, and will fail an EICR cleanly. We see this on Hendon Waterside and Brent Cross West basement bays where a third-party EV installer has fitted under time pressure without engaging the block's electrician. Correct install: dedicated final circuit from the consumer unit, Type B RCBO (or Type A depending on the charger's internal DC fault detection), Type 2 SPD, separate EIC issued, UK Power Networks notification if the new total load takes the flat over its supply rating.

Both protect against electric shock and electrical fire. The difference is granularity.

• RCD consumer unit (typically dual-RCD): Two big trip switches, each protecting a group of circuits. If one circuit faults, the whole RCD group trips — you lose the kitchen, lights, and sockets together.
• RCBO consumer unit (one RCBO per circuit): Each circuit has its own combined trip switch. If the kitchen socket faults, only that circuit goes off — the rest stay live.

Why we recommend RCBO for most Brent Cross installs:

• Faster fault diagnosis — you know immediately which circuit is faulty
• Less disruption — one bad iron doesn't kill the whole upstairs lighting
• Better with modern electronics — RCBOs are more sensitive and reliable

When dual-RCD is fine: small flats with simple circuit layouts, properties on a tight budget, short-term landlord-let where cost beats convenience.

Cost difference: typically £150 between dual-RCD (£800) and full RCBO (£950). For most homeowners we recommend the RCBO upgrade — it pays for itself the first time a fault localises rather than killing half the house.

This is the most common scare we see in Brent Cross — the fear-driven upsell to landlords.

Honest answer: plastic fuse boxes fitted before 1 January 2016 are still legal and don't automatically fail an EICR. They were the standard at the time of fitting. They become a problem only when:

• The plastic enclosure shows signs of overheating or burn marks (genuine C2)
• The board has no RCD protection on socket circuits (the fail reason isn't the plastic — it's the missing RCDs)
• The original installation was non-compliant when fitted

Since 1 January 2016, all new consumer units in domestic properties must be made of non-combustible material (typically metal). This is a forward-looking requirement — your existing plastic fuseboard doesn't get retrofitted just because the rules changed for new installs.

What you should worry about: not the colour of the box. Worry about RCD coverage, the age of the wiring, whether the existing fuse box has been properly maintained, and whether your EICR has C1/C2 codes against the consumer unit specifically. If an electrician quotes you for "a metal consumer unit because plastic fails EICR" without that nuance — get a second opinion.

Yes — Brent Cross West, Hendon Waterside (Barratt) and Brent Cross Town leases all include written-consent clauses on consumer-unit and fixed-wiring alterations. Some Argent Related blocks also require their nominated electrical contractor to sign off the work, paid by the leaseholder. We submit the scope (board type, circuit count, RCBO/AFDD arrangement, certification path) on one PDF to the managing agent at least 2 weeks before the install date. Skipping it can void the buildings insurance, and any sale solicitor will pick it up on the Form LPE1 enquiries.

Almost always yes. The new consumer unit is the brain; your existing circuits are the nervous system. We connect to your existing circuit cables — they don't get rewired.

What we test before we commit:

• Insulation resistance on every circuit (must be at or above 1MΩ; healthy 1990s+ installs typically read above 200MΩ)
• Earth continuity — needed for RCD/RCBO to work safely
• Loop impedance — the circuit's ability to clear a fault

If a circuit fails any of these tests, we tell you before we commit. Options:

• Single circuit fix (£100-£300) — repair the fault and continue
• Targeted partial rewire of just that circuit (£300-£600)
• Hold the upgrade and discuss whether a partial or full rewire is now better value

Common Brent Cross scenarios where wiring fails: 1950s-60s rubber-insulated cable in upstairs lighting circuits (Hendon Way and Hendon Way period properties), borrowed neutrals from DIY work, undersized cables on extension circuits.

We never "just power it back up" with a circuit that failed testing — that's how fires start. Honest tradeoffs only.

Honest answer: the £800 is fixed for the standard scope. Any extras are quoted upfront, never sprung on you mid-install.

What's covered in £800 (no surprise add-ons):

• The new consumer unit / fuse board (quality metal, 6-10 ways)
• RCD protection on socket and lighting circuits
• Re-terminating every existing circuit, properly labelled
• Full insulation, earth, and RCD testing on every circuit
• The Electrical Installation Certificate (EIC)
• Plaster patching with bonding plaster around the install

What CAN add to the price (we tell you before we start, with a fixed quote):

• Circuits failing insulation testing — we'll show you the readings, and you decide: targeted repair (£100-£300 per circuit) or hold the upgrade for a partial rewire conversation
• Incoming supply needs upgrading — rare; happens when adding heavy load like an EV charger or heat pump. We tell you upfront if your supply is borderline
• You opt for the premium tier — £950 (RCBO every circuit + surge protection) or £1,200+ (larger split-load board)

What we never do: discover a "problem" mid-install and charge you for it without your sign-off first. If we find something during testing, work pauses until you've decided. No scope creep.

Three checks. First — read the main cutout fuse rating in your meter cupboard (60A, 80A or 100A). Brent Cross West and Hendon Waterside flats were typically energised at 80A from build, sized for the original circuit count, not for a heat pump or EV charger. Second — calculate the new total load using diversity: 7 kW EV = 30A continuous, ASHP = 16-25A, existing ring = 32A. Even with diversity, three high-load circuits together will exceed an 80A cutout's headroom. Third — request a supply uplift from UK Power Networks via their I&C team. Most residential uplifts to 80A are free; over 80A is chargeable and takes 6-12 weeks lead time. Don't assume the supply can take new loads just because the board has spare ways.

Usually cumulative earth leakage from Class I devices clustered on one 30 mA RCD. Each smart device (router, smart TV, smart hub, induction hob, EV charger if you've added one) leaks a few hundred microamps to earth as normal operation. Across 5-6 circuits on the same RCD in a Brent Cross West dual-RCD board the total crosses 30 mA — the RCD trips even though nothing is actually faulty. Two fixes: short-term, rebalance which devices sit on which RCD bank; long-term, swap the board for a full-RCBO unit so leakage is monitored per circuit, never cumulative.

Yes — and we set up Brent Cross consumer units for it as standard. What we include:

• Spare 32A way on the fuseboard, labelled and ready for a 7kW or 22kW EV charger install
• Adequate supply headroom — we check your incoming supply and tell you upfront if a heat pump or EV charger needs a supply upgrade (often the headroom is fine, but worth confirming)
• SPD (surge protection) on the premium tier (£950) — protects every modern electronic in the house from voltage spikes
• Smart-home-ready circuits — neutrals to switch positions if you specify (most period houses don't have these, blocking smart switch installs later)

What gets retrofitted later costs more. Adding an EV charger circuit to an existing fuse box: £400-£600 extra labour because we need to chase walls, lift floor coverings, and isolate the supply again. Specifying it during the consumer unit upgrade: marginal cost only.

Tell us at the survey stage what you might add in the next 5 years — EV, heat pump, hot tub, garden room, second EV charger, home office. We size the board around your plans, not just your current circuits.

Almost never. Unlike a rewire, a consumer unit replacement is contained to the meter cupboard — usually under the stairs, in a hallway recess, or in a kitchen cupboard. The work stays in that one spot.

What we do during the install:

• Disconnect existing circuits at the old fuse box, label every cable
• Remove the old fuseboard from its mounting point
• Mount the new consumer unit in the same position (same screw holes where possible)
• Re-terminate every circuit into the new board
• Test, certify, and label every circuit on the new unit's chart

What we don't do:

• Chase walls
• Lift floorboards (unless an existing cable is too short to reach the new connection point — rare)
• Disturb skirting, sockets, or switches anywhere else in the house
• Affect any decoration outside the meter cupboard

The only plaster work: if the new board is a different physical size than the old one, we may need to patch a small area of bonding plaster around the mounting position. That's included; finishing coats and any decoration are a decorator's job.

Brent Cross properties with the original fuse box in a tight under-stairs space sometimes need a little extra work to fit a wider modern board — we'll show you the position before we start so you can decide whether to keep it where it is or relocate.