Consumer Unit Installation Services

Consumer Unit Replacement

Many older properties still have outdated fuse boxes or consumer units with limited protection compared with modern installations. A replacement consumer unit may be recommended where the existing board is damaged, lacks suitable RCD/RCBO protection, has limited circuit capacity, contains obsolete components or does not support planned electrical upgrades.

A modern consumer unit can provide improved circuit protection where correctly specified, installed, tested and certified. It does not eliminate all electrical risk, and any existing circuit defects may need to be corrected before or during the replacement work.

Do You Need a Consumer Unit Upgrade or Repair?

Whether a consumer unit should be repaired or replaced depends on its condition, age, circuit layout, protective devices, available capacity, test results and the type of work required. Some issues may be resolved by repair, while others may require a full replacement or further investigation.

A suitable assessment can help identify visible damage, outdated protection, limited capacity, missing circuit information or issues that may require further electrical testing before a recommendation is made.

The review may include:

What to Expect During the Appointment

During the appointment, the electrician may need to isolate power, access the existing consumer unit, test circuits, install the replacement board, label circuits and complete certification where applicable. The duration depends on access, circuit condition, number of circuits, existing faults and whether additional remedial work is needed.

A straightforward consumer unit replacement may take around 4–8 hours, but complex installations can take longer. Timescale depends on access, number of circuits, testing requirements, existing faults, earthing and bonding condition, certification and whether remedial work is needed.

Yes. Power is usually switched off for part of the work so the consumer unit can be replaced safely. The power-off period depends on the installation, testing and any faults found. Customers should plan for temporary disruption to sockets, lighting, heating controls, alarms, internet equipment or business equipment.

The existing location can often be used, but relocation may be needed if access, working space, cable length, heat, moisture, enclosure condition or regulation requirements make the current position unsuitable.

Customers should check their insurance policy or speak to their insurer if major electrical work has been completed. Keeping the Electrical Installation Certificate and Building Regulations compliance documents can help with future sale, rental, insurance or maintenance records.

After installation, keep the consumer unit accessible, dry and free from obstruction. Follow the electrician’s advice on using RCD or RCBO test buttons, check for warning signs such as heat, buzzing or burning smells, and arrange periodic inspection and testing where required.

In England and Wales, replacement consumer unit work in a dwelling is normally notifiable under Part P. The work should be notified through a registered competent person scheme or the correct Building Control route where applicable.

No. A new consumer unit may reveal existing circuit faults during testing. Any pre-existing faults, damaged wiring, earthing or bonding issues may need separate remedial work before the installation can be completed or certified.

Where applicable, an Electrical Installation Certificate should be issued for the completed work, and Building Regulations notification should be completed where required. The exact documents depend on the property type, work scope and notification route.

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