Conaty&Co. Electrical Services
February 22, 2025 · NAPIT Approved Electricians
A realistic breakdown of consumer unit replacement costs in Liverpool, including factors that affect pricing, types of fuse boards and why you should never DIY.
What Is a Consumer Unit and Why Does It Matter?
The consumer unit, commonly known as a fuse board, is the heart of your home's electrical system. It distributes power to every circuit, protects against overloads and short circuits, and prevents electric shock through RCD and RCBO devices. An outdated or faulty consumer unit puts your entire property at risk.
Old consumer units with rewireable fuses, outdated cartridge fuses, or no RCD protection are no longer considered safe by modern standards. BS 7671 18th Edition wiring regulations now require enhanced protection, and insurers increasingly refuse cover for properties with outdated fuse boards.
If your consumer unit is over 15 years old, has no RCD, uses rewireable fuses, or has been flagged during an EICR, it is time to upgrade. The cost of a new unit is modest compared to the safety benefits and potential insurance savings.
Types of Consumer Unit: Which One Do You Need?
There are three main types of consumer unit in common use today. A standard dual RCD board splits circuits across two RCDs — cost-effective but can cause nuisance tripping of multiple circuits. An RCBO board provides individual protection for every circuit with a separate RCBO per circuit — the safest and most convenient option, though more expensive.
A high integrity board combines the best of both, using RCBOs for critical circuits and a main RCD for the rest. This is often the most cost-effective choice for properties with a mix of essential and non-essential circuits.
At Conaty&Co., we recommend RCBO boards for most residential upgrades. The additional cost (typically £100-£200 over a dual RCD board) is more than justified by the superior protection, reduced nuisance tripping, and compliance with the latest regulations.
What Affects the Cost of a Consumer Unit Upgrade?
The cost of upgrading a consumer unit in Liverpool depends on several factors: the type and size of the new board, the number of circuits, the condition of the existing wiring, whether the earthing and bonding need updating, the need for surge protection, and the complexity of the installation environment.
A straightforward replacement of a 10-way dual RCD board in an accessible location costs around £450-£650. An RCBO board with 12 ways, surge protection, and a new earth electrode in a tight cupboard costs more — typically £700-£1,000.
Properties with old wiring may also need supplementary bonding updates, earth electrode installation, or even partial rewiring of circuits to meet current standards. These are identified during the initial survey and quoted transparently.
Why You Should Never DIY a Consumer Unit Upgrade
Consumer unit replacement is not a DIY job. It involves working on live electrical connections, calculating load capacities, ensuring proper discrimination between protective devices, and understanding earthing arrangements. Mistakes can cause fires, electric shock or death.
Under Part P of the Building Regulations, consumer unit replacement in a dwelling must be carried out by a NAPIT or NICEIC registered competent person. DIY work is illegal, voids your insurance, and makes your property unsaleable.
At Conaty&Co., every consumer unit upgrade is carried out by a qualified, NAPIT registered electrician. We handle all testing, certification and Building Control notification. You receive a full Electrical Installation Certificate and peace of mind that your home is properly protected.
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