Do You Need a Consumer Unit Upgrade? Here's How to Tell

What Is a Consumer Unit?

Your consumer unit — commonly called a fuse box — is the central hub of your home's electrical system. It distributes power around the house via individual circuits and, crucially, protects those circuits from overload and fault conditions.

Old Fuse Box vs Modern Consumer Unit

Older properties (pre-2000s) often have fuse boxes with rewirable ceramic fuses. These offer minimal protection compared to modern units equipped with:

• MCBs (Miniature Circuit Breakers) — trip automatically when a circuit is overloaded, rather than blowing a fuse
• RCDs (Residual Current Devices) — detect earth faults and cut power in as little as 40 milliseconds, potentially saving lives
• RCBOs — combine the functions of both an MCB and RCD for maximum protection per circuit

Signs You Might Need an Upgrade

• Your fuse box still has rewirable fuses or old-style cartridge fuses
• You frequently experience tripped breakers
• You're planning to add significant new load (EV charger, solar PV, hot tub)
• Your home doesn't have RCD protection on all circuits
• A periodic inspection (EICR) has flagged the unit as unsatisfactory

What Does the Work Involve?

A consumer unit upgrade typically takes one full day. Here's what happens:

1. Power is isolated at the meter
2. The old unit is removed
3. Circuits are re-terminated into the new unit
4. RCD protection is verified on all circuits
5. The supply is reconnected and all circuits tested
6. An Electrical Installation Certificate is issued

You'll be without power for most of the day, so it's worth planning ahead.

How Much Does It Cost?

In Northumberland, a typical consumer unit upgrade costs between £400–£700 depending on the number of circuits and any remedial work identified during installation. We provide fixed-price quotes after a free assessment.

Is it Mandatory?

It's not legally required to upgrade an old fuse box unless you're doing notifiable electrical work nearby, or it's been flagged as dangerous in an EICR. However, for the safety of your family and the value of your home, we'd always recommend it if you have an older installation.

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Get in touch for a free assessment — we cover Blyth, Cramlington, Ashington, Morpeth, Whitley Bay and the wider North East.