Replacing a Consumer Unit and Electrical Safety Checks
The consumer unit distributes electricity around the property and contains the protective devices. Older units frequently lack protection that modern standards require, and replacing one is considerably cheaper than rewiring.
Why older units fall short
Rewirable fuses provide overload protection and nothing else. They do not detect the small leakage currents that cause electric shock.
Residual current protection detects imbalance between live and neutral and disconnects rapidly, which is what protects people. Older installations often have none, or only on a single circuit.
Modern units also incorporate protection against arc faults in some designs, and metal enclosures for fire containment under current standards in several jurisdictions.
When a replacement is enough
Where the circuits themselves are in good condition — modern PVC cable, sound earthing, adequate socket provision — a new unit brings protection up to standard without disturbing the wiring.
This is common in houses wired in the past few decades that simply have an outdated board.
An electrical installation condition report establishes whether the circuits are sound. If it returns significant coded defects in the wiring, a new unit alone does not resolve them.
What the job involves
Isolation of the supply, replacement of the unit, testing of every circuit, and certification. Expect the power to be off for several hours.
Testing frequently reveals pre-existing faults — borrowed neutrals, damaged cables, poor earthing — that must be corrected before the new unit can be certified. This is the most common cause of a quote increasing, and a good electrician will flag the possibility beforehand.
Additional work sometimes required includes upgrading main bonding to gas and water services, which is a safety requirement and frequently missing in older properties.
Certification
You should receive an electrical installation certificate on completion, and in many jurisdictions the work must be notified to building control, which competent-person scheme members can do themselves.
Keep the certificate. It matters for insurance, for letting, and at sale.
Periodic inspection
Recommended intervals are commonly around ten years for owner-occupied homes and five years or at change of tenancy for rented property, with legal requirements applying to landlords in many places.
The report grades observations. Codes indicating danger or potential danger require action; improvement recommendations do not.
Be cautious of reports recommending a full rewire without coded defects to support it, and get a second opinion where a large sum is involved.
Choosing an electrician
Use someone registered with the relevant competent-person scheme and verify the registration on the scheme's own website rather than trusting signage.
Get the quote in writing including testing, certification, notification and any likely remedial work, and ask what happens if faults are found during testing.
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