Signs it may need replacing
- It has rewireable fuses (fuse wire in ceramic holders) rather than switches
- There's no RCD protection. Electrical Safety First explains why RCDs matter
- It's mounted on a wooden backboard, or the casing is cracked, scorched or plastic and very old
- It trips often, buzzes or feels warm
- You're adding circuits (an extension, EV charger, electric shower) and there's no space or capacity
- An EICR has recommended it
What an upgrade involves
The power is off while the old board is removed and a new one is fitted. Circuits are tested before and after: tests sometimes find existing faults that need fixing before the new board can be safely energised. Current wiring regulations (BS 7671) set requirements for domestic consumer units, including a non-combustible enclosure.
Replacing a consumer unit is notifiable under Part P, so you should receive certificates when it's done.
How long it takes and what it costs depend on the size of the board and the condition of your circuits. Call Steve or use the quote form to ask what your upgrade would involve.
Never remove the cover of a consumer unit. Parts inside are live even with the main switch off.
If any of the signs above apply, or you're planning work that adds circuits. Steve fits consumer unit upgrades: see services.
Sources and further reading
- Electrical Safety First – Why you need an RCD
- IET – BS 7671 Wiring Regulations
- GOV.UK – Approved Document P (electrical safety in dwellings)
General guidance only, based on the sources above. Last reviewed October 2026. It isn't a substitute for an inspection by a qualified electrician.