How disruptive is a consumer unit upgrade?

A consumer unit upgrade is normally far less disruptive than rewiring a property. The main inconvenience is the temporary loss of electricity while we disconnect the existing board, install the replacement and carry out the required tests.

The work usually stays close to the current consumer unit. We do not normally need to lift floors or open walls simply to replace the board. Existing circuits are connected to the new protective devices, provided their cables and accessories are suitable.

What you’ll notice during the work

• The electricity supply will be isolated, so lights, sockets, heating controls and appliances connected to the board will not work for part of the installation.
• There may be drilling, cable movement and short bursts of noise around the board.
• We need clear access to the consumer unit and to nearby sockets, switches or other points if circuit testing identifies an issue.
• The surrounding area may need temporary protection, particularly where the board is in a hallway, cupboard, utility room or finished living space.

Most of the disruption comes from planning around the power being off. Before we start, switch off computers and other sensitive equipment properly rather than relying on the supply interruption. Keep fridge and freezer doors closed, and make arrangements for electrically powered medical equipment or security systems if the property depends on them.

If the board is in a cupboard, move stored items out of the way. We need enough room to remove the old enclosure, route conductors neatly and inspect the connections. Clear access helps us keep the work contained and reduces the chance of disturbing surrounding finishes.

Older properties can need more investigation

A replacement board does not hide problems in the wiring. In an older house, we may find brittle insulation, loose connections, an unidentified circuit or a protective conductor that needs attention. Rural properties and buildings that have been extended over time can have several additions connected to the original installation.

These findings can affect the disruption because we may need to trace a circuit, improve a connection or carry out a small repair before the new board can be safely commissioned. We explain anything that changes the work and provide a written quotation before additional work starts. We will not treat a consumer unit change as permission to carry out unrelated upgrades.

Some faults cannot be corrected from the consumer unit itself. For example, damaged cable or an inaccessible junction may need work elsewhere in the property. We explain where the issue is, why it matters and what access would be needed. That gives you a clear choice about the next step instead of discovering a larger job after the power has been disconnected.

How we reduce the inconvenience

• We review the existing board and installation before agreeing the work, so access and likely complications are understood.
• We label circuits clearly as they are identified, making the finished board easier to use.
• We keep tools and materials near the work area rather than spreading them through the house.
• We test the protective devices, earthing and circuits before the supply is fully returned.
• We explain any limitations or follow-on repairs in the electrical installation certificate or supporting paperwork.

The final checks matter because a new consumer unit is only useful if the connected circuits are safe to energise. We test each circuit and confirm that the protective devices operate correctly. If a circuit cannot be safely returned to service, we explain the reason and agree how to deal with it.

For a straightforward installation, you should expect a focused period without power rather than several days of building work. The exact interruption depends on the board, the number of circuits and the condition of the existing installation. A survey gives the most reliable indication, particularly in an older home or one that has been extended.

Once the work is complete, you should have a clearly labelled board, the relevant test results and an explanation of anything that still needs attention. The room should remain usable without the dust and disruption associated with a full rewire.