5 Signs Your Fuse Board Needs Replacing (UK Homes 2026)
Your fuse board (also called a consumer unit) is the most safety-critical bit of electrical kit in your home. If it’s old, you’re not getting the protection modern wiring regulations require. Here are the ten clear signs it needs upgrading — written by NICEIC accredited electricians.
1. It still has rewirable fuses (the old wire-and-screw type)
If you’ve ever replaced a “fuse” by unscrewing it and threading a thin piece of wire across two terminals, that’s a rewirable fuse. They were standard from the 1930s to the 1970s. They’re dangerous.
2. It’s a split-load board fitted between 1990 and 2010
Split-load boards have one or two RCDs covering several circuits each. They’re now a C3 observation on a modern EICR.
3. Your breakers trip frequently under normal use
Random nighttime trips? Kettle + toaster flips a breaker? That’s either a fault or undersized circuits. Get an EICR.
4. Visible damage, scorch marks, burning smell
Brown / black discolouration around any fuse holder, cracking in the plastic, or an acrid smell = call an electrician today. Live fire risk.
5. It’s plastic, in a hallway, fitted before 2016
Post-2016 consumer units must be non-combustible (metal). Older plastic boards in escape routes are now flagged C3 on an EICR.
6. There is no RCD at all (no test button on the board)
Open the door and look for a button marked T or Test. If there is not one, the board has no residual current device and nothing on the installation will disconnect fast enough to protect a person against an electric shock. BS 7671 requires 30 mA RCD protection for socket circuits, cables buried in walls and anything outdoors. On an EICR this is normally coded C2 — potentially dangerous, which makes the whole report Unsatisfactory.
7. The board is full — no spare ways left
A full board is not dangerous on its own, but it blocks everything else. Adding an EV charger, an electric shower, a garden supply or a kitchen circuit all need a spare way. This is the single most common reason a London EV charger quote comes back higher than the headline price: the board has to be changed first. If you are planning any of those in the next year, replace the board as part of that job rather than twice.
8. Circuits are unlabelled, or the labels are wrong
BS 7671 requires every circuit to be identified at the board. Faded, missing or plain wrong labels are coded C3 on an EICR, and they cost you money on every subsequent visit because an electrician has to trace and prove each circuit before working on it. On older London flats we regularly find labels describing a layout that was changed two owners ago.
9. It is mounted on a wooden backboard, or you cannot reach it
Consumer units fitted to bare timber, or boxed into a cupboard behind shelving, fail on two counts: the fire-containment requirement introduced in 2016, and the requirement that the means of isolation is accessible in an emergency. If you cannot get to the main switch in the dark without moving something, that is a problem worth fixing regardless of the board’s age.
10. Your last EICR listed C1 or C2 items against the board itself
Individual faults on circuits can usually be repaired. When the codes sit against the board — no RCD, damaged enclosure, loose or undersized main tails, no main bonding at the intake — repairing item by item is almost always more expensive than replacing the unit. Landlords have 28 days from the report date to remedy C1 and C2 items, so decide quickly which route you are taking.
What a modern consumer unit looks like
Metal enclosure, all-RCBO design (every circuit individually protected), Surge Protection Device, AFDD on bedroom circuits. £450-£650 fitted in a London flat.
What to do next
If any of these signs apply: get an EICR or go straight to a fuse board replacement quote. We cover Camden, Islington, Hackney, Tower Hamlets, Southwark and surrounding Inner London.
Phone: 07407 627542
WhatsApp: Send us a photo of your fuse board and we’ll tell you straight.
Related: fuse board replacement London, what a fuse board replacement costs, RCD won’t reset, all London service areas.