Your consumer unit (fuse board) is the heart of your home electrical system. Here is how to tell if yours needs upgrading and what is involved.
What Is a Consumer Unit?
The consumer unit — often called a fuse board or fuse box — is the central panel where your electricity supply is distributed to all the circuits in your home. It contains your main switch, circuit breakers (MCBs), and residual current devices (RCDs or RCBOs) that protect you from electric shock and your wiring from overload. Modern consumer units use a metal enclosure (required since 2016 for new installations) and provide individual protection for each circuit in your home.
Signs Your Consumer Unit Needs Upgrading
There are several clear signs that your consumer unit needs replacing. If it still uses rewirable fuses (with wire that melts to break the circuit), it is outdated and does not provide the level of protection modern standards require. If it has a plastic enclosure rather than a metal one, it does not meet current fire safety standards. If circuit breakers trip frequently without obvious cause, the unit may be failing. If you are adding new circuits (for an EV charger, solar panels, or an extension), your existing unit may not have enough capacity or the right type of protection.
Why Upgrading Matters for Safety
An outdated consumer unit is one of the biggest electrical safety risks in a home. Modern units with RCBOs provide individual protection for every circuit — if a fault occurs on one circuit, only that circuit trips, and the rest of your home stays powered. Older split-board designs with RCDs protect groups of circuits together, meaning a fault on one circuit can knock out half your home. Metal enclosures reduce fire risk if a component overheats. Upgrading your consumer unit brings your home in line with the latest edition of the IET Wiring Regulations (BS 7671).
Consumer Unit Upgrades for Solar and EV Chargers
If you are installing solar panels, a battery storage system, or an EV charger, your consumer unit needs to have enough spare capacity and the correct type of circuit protection for these additions. Solar PV requires a dedicated MCB, and EV chargers require a dedicated circuit with appropriate overcurrent protection. If your existing consumer unit is full or outdated, we will recommend upgrading it as part of the installation. This ensures everything is safe, compliant, and ready for your new energy system.
What Is Involved in an Upgrade?
A consumer unit upgrade typically takes a qualified electrician 4-8 hours depending on the number of circuits and the complexity of the existing wiring. The power to your home will be off for most of this time (usually 4-6 hours). The old unit is removed, a new metal unit is installed and wired, and all circuits are tested and certified. You will receive an Electrical Installation Certificate (EIC) confirming the work meets current standards. We also carry out a visual inspection of your existing wiring and will advise if any other work is recommended.
NICEIC-Approved Installations
Consumer unit upgrades must be carried out by a qualified electrician who is registered with a competent person scheme. As NICEIC-approved contractors, GM Electrical Services can self-certify consumer unit upgrades and notify building control on your behalf. This means you get a fully compliant installation with all the correct paperwork, without needing to arrange a separate building control inspection. We carry out consumer unit upgrades across Lancashire and the North West as both standalone projects and as part of larger solar and EV charger installations.
Interested in this service?
Get a free, no-obligation quote from our expert team.