If your home still has an old fuse box with rewirable fuses, replacing it with a modern consumer unit is one of the most worthwhile safety upgrades you can make. Most UK homeowners pay somewhere between £450 and £900 for a straightforward replacement, but the final figure depends on your property, your wiring and what the electrician finds once the old unit comes off the wall. Here is an honest breakdown of what goes into the price.
For a standard three bed house with wiring in reasonable condition, a like for like swap to a modern consumer unit usually costs between £450 and £900 including parts, labour, testing and certification. Smaller flats with fewer circuits often come in towards the lower end, while larger homes with ten or more circuits, or homes needing extra work such as new bonding to gas and water pipes, can reach £1,000 to £1,500.
The consumer unit itself is only part of the cost. A quality metal clad unit with RCBOs (a combined safety device for each circuit) typically costs £150 to £300 in materials. The rest covers a full day of skilled labour, testing every circuit, and producing an Electrical Installation Certificate with notification to Building Control, which is a legal requirement for this work in England and Wales.
The biggest factor is the condition of your existing wiring. An electrician cannot legally connect a new consumer unit to circuits that fail testing, so faults such as damaged cables, missing earth connections on lighting circuits (common in homes wired before the mid 1960s) or borderline insulation readings all add remedial work. In older Birmingham housing stock, particularly Victorian and interwar terraces, it is not unusual for the survey to uncover issues the old fuse box simply never flagged.
Other things that affect cost include the number of circuits, whether main bonding to gas and water pipes needs upgrading, awkward access such as a unit buried in a cupboard under the stairs, and whether the incoming supply needs the electricity network operator or your supplier to attend, for example to move the meter or upgrade the main fuse. Choosing all RCBO protection rather than a cheaper split load board adds £50 to £150 but means one faulty appliance will not trip half the house.
A replacement is normally a one day job. The electrician will isolate the supply, remove the old unit, connect and label each circuit in the new board, then dead test and live test every circuit. Expect the power to be off for most of the working day, so plan around fridges, freezers and home working. You should receive an Electrical Installation Certificate before the electrician leaves or shortly after, followed by a Building Regulations compliance certificate through their registration scheme such as NICEIC or NAPIT.
Be wary of quotes that seem too cheap. A proper job includes pre work testing, correct bonding checks and certification. If someone offers to swap the board in two hours with no testing, the paperwork you need for insurance and for selling the house later will not exist, and genuine faults in the wiring stay hidden behind a new front.
An old fuse box is not automatically illegal. If it is in good condition and the wiring tests fine, it can stay, though it will lack RCD protection, which has been standard for good reason since 2008. Replacement becomes strongly advisable if you have rewirable fuses, a wooden backed or cracked unit, signs of scorching, no RCD protection, or you are having other electrical work done such as an extension, an EV charger or a new kitchen, where current regulations will usually require the board to be brought up to standard anyway.
If you are unsure, an Electrical Installation Condition Report (EICR) is the sensible first step. It typically costs £150 to £300 for a house and tells you the true state of the wiring before you commit to anything, so any quote you then receive is based on facts rather than guesswork.
Usually one working day, around six to eight hours including full testing of every circuit. If testing reveals faults that need fixing, it can run into a second visit.
Yes. In England and Wales it must be notified to Building Control, which a registered electrician does through their scheme, and you should receive both an Electrical Installation Certificate and a compliance certificate.
Often yes, provided it passes testing. Modern RCDs are more sensitive than old fuses, so pre existing faults sometimes cause tripping, which is why a reputable electrician tests the circuits before quoting or fitting the new board.