Consumer Unit Upgrades · Cardiff & South Wales
Consumer Unit Upgrades
in Cardiff
Replace your outdated fuse board with a modern, metal-clad consumer unit featuring RCD or RCBO protection — typically completed in a single day with zero disruption to your daily routine.
5.0 from 40+ reviews · Same-day completion · NICEIC ApprovedWhat Is a Consumer Unit Upgrade?
A consumer unit upgrade involves replacing your existing fuse board — often referred to as a fuse box or distribution board — with a modern consumer unit that meets current BS 7671 18th Edition wiring regulations. This is one of the most impactful safety improvements you can make to your home's electrical system.
Modern consumer units provide RCD (Residual Current Device) or RCBO (Residual Current Breaker with Overcurrent) protection on every circuit. These devices detect earth faults and disconnect the supply within milliseconds — dramatically reducing the risk of electric shock and electrical fire. Older fuse boards with rewirable fuses or early MCBs do not provide this level of protection.
A consumer unit upgrade is essential if your existing board uses rewirable fuses, has no RCD protection, is a plastic (non-fire-rated) enclosure, lacks capacity for additional circuits, or has been identified as unsatisfactory during an EICR. In Cardiff, a large number of properties built before the year 2000 still have consumer units that do not meet current safety standards.
At Cardiff Electrical Home Rewire Ltd, we complete most consumer unit upgrades within a single working day. The power is typically off for 4–6 hours during the changeover, and we schedule the work to minimise inconvenience. Every upgrade includes a full test of all existing circuits and a new Electrical Installation Certificate.
- Replacement of outdated fuse boards with 18th Edition consumer units
- Metal-clad enclosure meeting fire safety regulation 421.1.201
- Dual RCD or full RCBO protection on all circuits
- Full testing of all existing circuits during installation
- Electrical Installation Certificate issued on completion
- Typically completed within a single working day
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Our Work
Recent Consumer Unit Upgrade Projects
Why Outdated Fuse Boards Put Your Home at Risk
Your consumer unit is the heart of your home's electrical system. If it is outdated, it cannot provide the protection that modern safety standards require — leaving your family and property exposed to preventable risks.
No RCD Protection
Older fuse boards without RCDs cannot detect earth faults. This means a fault could continue to flow undetected, creating a sustained fire or shock risk that modern devices would eliminate in milliseconds.
Plastic Enclosure Fire Risk
Pre-2016 plastic consumer units can melt and ignite during an internal fault. Current regulations require metal-clad enclosures specifically to contain any internal arcing and prevent fire spread.
Rewirable Fuse Dangers
Rewirable fuses can be incorrectly rated — often fitted with the wrong wire gauge — providing either too much or too little protection. They also degrade over time and do not trip reliably under fault conditions.
Insurance Implications
Insurance providers increasingly scrutinise electrical installations. An outdated consumer unit flagged in an EICR can complicate claims or increase premiums, particularly for rental properties.
Circuit Overload Risk
Older boards with limited capacity cannot safely accommodate additional circuits. Overloading existing MCBs or fuses creates overheating risks in the board itself.
Regulatory Non-Compliance
Properties with consumer units that do not meet current standards face compliance issues during sales, lettings, and renovations — often requiring urgent upgrades at premium cost.
How It Works
Our Consumer Unit Upgrade Process
Assessment
We inspect your existing consumer unit and test all circuits to determine the correct specification for your replacement board.
Fixed-Price Quote
You receive a clear, itemised quote detailing the consumer unit specification, any additional work required, and the expected timeline.
Installation
We isolate the supply, remove the old board, install the new metal-clad consumer unit, and reconnect all circuits with appropriate protection.
Full Testing
Every circuit is tested — including insulation resistance, earth fault loop impedance, and RCD trip times — to confirm full compliance.
Certification
You receive an Electrical Installation Certificate confirming the work meets BS 7671 and Part P building regulation requirements.
Why Choose Us
Benefits of a Modern Consumer Unit
RCD/RCBO Protection
Every circuit is protected by devices that disconnect in under 40 milliseconds when a fault is detected — the single most effective defence against electric shock.
Fire-Rated Enclosure
Metal-clad consumer units contain any internal arcing within the board, preventing fire spread to surrounding building materials.
Circuit Discrimination
RCBO boards allow individual circuit protection — a fault on one circuit trips only that circuit, not half your house.
Future Capacity
New boards include spare ways for future circuits — EV chargers, garden buildings, extensions — without requiring another upgrade.
Same-Day Completion
Most consumer unit upgrades are completed within 4–6 hours of power interruption, meaning your home is fully operational by the end of the day.
Insurance & Sale Ready
A compliant consumer unit with certification satisfies insurance requirements and removes a common buyer objection during property sales.
Consumer Unit Upgrades: Technical Details
Split-Load vs Full RCBO Boards
Split-load consumer units use two 63A RCDs, each protecting a group of circuits. This is cost-effective but means a fault on any circuit within a group will disconnect all circuits in that group. Full RCBO boards provide individual protection per circuit — each breaker combines overcurrent and earth fault protection independently. We recommend RCBO boards for properties with home offices, medical equipment, or where uninterrupted power to specific circuits is important. Both options meet current regulations, and we advise on the best choice for your specific situation.
Main Switch and Isolator Requirements
All new consumer units include a 100A main switch as standard, providing a single point of isolation for the entire installation. In properties with electric heating, high-powered showers, or multiple high-draw circuits, we verify that the main switch and supply capacity are adequate for the total connected load. Where the incoming supply requires upgrading, we coordinate with the Distribution Network Operator (DNO) on your behalf.
Earthing and Bonding Verification
A consumer unit upgrade is an opportunity to verify and improve the earthing and bonding arrangements throughout the property. We test the main earth, check supplementary bonding in bathrooms and kitchens, and upgrade where necessary. Correct earthing is essential for RCDs to function properly — an RCD on a poorly earthed circuit may not trip when needed, providing a false sense of security.
Surge Protection Devices (SPDs)
Since the 2022 amendment to BS 7671, surge protection devices are required in most new and upgraded installations. SPDs protect sensitive electronic equipment — computers, TVs, smart home systems — from voltage spikes caused by lightning strikes or switching events on the grid. We include Type 2 SPDs as standard on all consumer unit upgrades, providing an additional layer of protection for your appliances and devices.
Consumer Unit Upgrades for Rental Properties
Landlords have specific legal obligations regarding electrical safety under the Electrical Safety Standards in the Private Rented Sector (England) Regulations 2020 and equivalent Welsh regulations. A consumer unit that fails an EICR must be upgraded within 28 days. We provide priority scheduling for landlords who need to meet these deadlines and can arrange EICR testing and consumer unit upgrades in a single visit to minimise tenant disruption.
Compatibility with Older Wiring
A new consumer unit can be installed on existing wiring provided the wiring is in an acceptable condition. During the upgrade, we test every circuit and will advise if any wiring requires attention before it can be safely connected to the new board. In most cases, a consumer unit upgrade can proceed without any changes to the existing wiring, but we will always be transparent about any additional work that is needed.
Frequently Asked Questions
Common Questions
Ready to Get Started?
Get a free, no-obligation quote. We respond within the working day and can typically schedule your initial visit within 48 hours.
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