Pre-change assessment
Supply, earthing, circuit count, board location and accessible installation condition are reviewed.
Alesta · Fuse box replacement in London
A consumer unit upgrade built around the circuits it protects.
Planned fuse box replacement with the supply, earthing, circuit condition, enclosure, protective devices and required testing assessed before installation.
☎ Call 020 3608 3976Testing before board change
A new consumer unit does not repair faulty circuits by itself.
The protective board must suit the incoming supply and every connected circuit. Existing insulation defects, borrowed neutrals, poor earthing or undocumented alterations can prevent a straightforward change and need identifying before the old board is removed.
We review the installation, available records, enclosure position and circuit count first. The design then considers RCD or RCBO protection, surge protection, isolation, spare capacity and any remedial work required for safe connection.
Protective-device design
Circuit arrangement, residual-current protection and surge requirements are specified.
Board replacement
The old unit is removed and circuits terminated, identified and enclosed appropriately.
Inspection and certification
Connected circuits are tested and the completed work documented for handover.
Common reasons customers call
When the existing fuse box no longer provides a suitable platform.
The board uses outdated fuse arrangements
The enclosure and protection may not suit planned work or current household use.
New circuits are being added
An extension, kitchen or charger project needs compatible protection and capacity.
Inspection identifies board deficiencies
Enclosure, protection, labelling or earthing concerns require a planned upgrade.
Fault isolation is difficult
Poor schedules and mixed circuits make safe control and future maintenance unclear.
Why Alesta for consumer units
An upgrade based on circuit evidence, not appearance alone.
Circuits assessed first
Testing helps reveal faults that a new board would otherwise expose during installation.
Protection designed by circuit
Devices are selected for the installation rather than one generic package.
Power interruption planned
Access, shutdown time and any occupied-property needs are agreed in advance.
Labelling and records completed
The final schedule, test results and applicable certification support future use.
A tested protective upgrade
How we replace a fuse box or consumer unit.
The project begins with an assessment of the supply and connected installation. The electrician records the service arrangement, earthing, bonding, board location, circuit count and existing protective devices. Available certificates and circuit schedules are useful. Pre-change testing helps identify insulation faults, shared neutrals or unsafe circuits that could trip new protection or prevent connection after the old board is removed.
The replacement design is matched to the installation and intended future use. Enclosure size, main switch, RCBO or RCD arrangement, surge protection and spare capacity are considered by circuit rather than selected as a cosmetic package. Access around the board, cable length and fire-stopping needs are confirmed. The customer is told how long power is expected to be off and which pre-existing remedial items are included.
On installation day, the supply is safely isolated and the existing board removed in a controlled sequence. Cables are identified, prepared and terminated into the new enclosure with suitable support and entry protection. Circuits are labelled accurately and obvious defects are not hidden to make them fit. If testing or opening the board reveals a material condition that was inaccessible at survey, the implication is explained before additional work proceeds.
Before energisation, the electrician inspects and tests the board and connected circuits to the applicable scope. Protective devices are verified, the schedule is completed and the customer is shown normal isolation and test functions. Required certification and notification are prepared for the completed installation. A circuit that remains unsafe may need isolation rather than connection; the new consumer unit must not be used to legitimise defective wiring.
Clear pricing
Fuse box replacement prices.
Cost depends on circuit count, board specification, supply and earthing condition, access, pre-existing faults and certification.
| Service scope | Price | What affects the final price |
|---|---|---|
| Small consumer unit replacement | From £400 | Circuit count, standard enclosure, access and satisfactory existing circuits |
| Typical home RCBO consumer unit | Typically £500–£800 | Devices, surge protection, testing, labels and certification |
| Remedial or enabling electrical work | Quoted from testing | Earthing, bonding, circuit faults, cable extensions and access |
Pricing context: Audited Alesta pricing places consumer-unit replacement broadly between £400 and £800 before significant circuit remediation. Pre-change assessment is essential for confirmation.
How the service works
From installation assessment to a labelled new board.
Review supply and circuits
The electrician checks board details, earthing, circuit count and test information.
Specify protection and remedials
The enclosure, devices, shutdown and known enabling work are agreed.
Replace, test and certify
Circuits are terminated, identified, tested and handed over with records.
Fuse box replacement FAQ
Before the consumer-unit change.
Useful answers about testing, power interruption, faults, protection and pricing.
☎ Call 020 3608 3976How do I know if the fuse box needs replacement?
An electrician should assess its condition, protection, enclosure, labelling and suitability for planned work. Age alone does not define the scope.
Why is testing needed before replacement?
Modern protective devices can reveal faults in existing circuits. Pre-change testing reduces the risk of discovering problems only after the old board is removed.
How long will the power be off?
It depends on circuit count, access and remedial findings. The expected shutdown window is discussed after assessment.
Will a new board stop circuits tripping?
Not if an underlying circuit or appliance fault exists. New protection may operate correctly and make a pre-existing issue more visible.
Are surge protection and RCBOs included?
They are included only according to the agreed design and quotation. The required arrangement depends on the installation and applicable standards.
Will I receive certification?
Applicable electrical installation certification and notification are provided for the completed consumer-unit replacement.
What affects the final price?
Circuit count, device specification, board location, earthing, cable condition, remedial faults, test time and certification affect the total.