The short answer
You are likely to need a new consumer unit if your board still uses old rewireable fuses, has no RCD protection (no test button on the board), shows scorch marks, a burning smell, buzzing or crackling, trips repeatedly, or fails an EICR with C1 or C2 codes. You may also need an upgrade when adding a major new circuit such as an EV charger or an extension, because the new work has to meet current standards. A board that is modern, fully RCD or RCBO protected, undamaged and passing its tests usually does not need replacing just because it is a few years old. The honest test is its condition and protection, not its age alone — an inspection by a registered electrician is the way to be sure.
A consumer unit doesn't need replacing simply because it looks dated. What matters is the protection it provides and its condition. Here are the signs that genuinely point to an upgrade.
Signs to look for
- Rewireable fusesolder board; often no RCD
- No test buttonmay have no RCD protection
- Scorching / burning smellget it checked promptly
- Repeated trippingmay be a fault being detected
- EICR C1 or C2remedial work needed
Signs that point to a replacement
Look for these together rather than in isolation: rewireable fuses (brown or ceramic carriers) instead of switch-like breakers; no test button on the board, which can mean no RCD protection at all; any scorching, a burning smell, buzzing or crackling around the unit, which can indicate loose connections or overheating; breakers or fuses that trip repeatedly; or an EICR that returns C1 or C2 codes. Adding a significant new circuit — an EV charger, an extension or an outbuilding — can also trigger an upgrade, because the new work and its protection must meet current standards.
| Sign | What it can indicate |
|---|---|
| Rewireable fuse wire | older board, likely no RCD |
| No RCD / no test button | limited shock protection |
| Scorching or burning smell | overheating or loose connection |
| Repeated, unexplained tripping | a fault being detected |
| EICR coded C1 / C2 | remedial work required |
General guidance — a registered electrician's inspection confirms what your board needs. Sources: Electrical Safety First, trade guides.
When you probably don't need one
Not every older-looking board needs replacing. If yours already has circuit breakers and RCD or RCBO protection, shows no damage or overheating, isn't tripping, and passes its tests, age alone is not a reason to change it. Be wary of any pressure to replace a sound, well-protected board without an inspection finding a real fault. The right call comes from a periodic inspection (an EICR), not from the look of the box.
Not sure if yours needs replacing?
We'll match you with a vetted, registered electrician who inspects your board, tells you honestly whether it needs upgrading or can stay, and explains any EICR findings.
Frequently asked questions
What are the signs I need a new consumer unit?
Rewireable fuses instead of breakers, no RCD protection (no test button), scorching or a burning smell, buzzing or crackling, breakers that trip repeatedly, or an EICR returning C1 or C2 codes. Adding a major new circuit such as an EV charger can also require an upgrade.
Do I need to replace my consumer unit just because it's old?
Not necessarily. If the board has circuit breakers and RCD or RCBO protection, shows no damage, isn't tripping and passes its tests, age alone isn't a reason to change it. Condition and protection matter more than age.
Do I need a new consumer unit to fit an EV charger?
Sometimes. The charger circuit must meet current standards and have suitable protection, so if your existing board can't accommodate that safely, an upgrade may be needed. A registered electrician will assess this as part of the install.
Sources & further reading
- Electrical Safety First — replacing a consumer unit (best practice guide)
- Checkatrade — cost of replacing a fuse box / consumer unit
Figures on this page are typical UK ranges drawn from published sources and depend on your specific property and installation. They are guidance, not a quotation.