Consumer unit replacement: what happens on the day?

Find out what happens during consumer unit replacement, from access and isolation to testing, existing faults and the installation handover.

Before the appointment

Confirm access to the consumer unit and the areas needed for inspection and testing. Make the electrician aware of equipment that cannot be interrupted without planning. Keep the agreed quotation and any previous report available so the work can be checked against the intended scope.

Assessment and isolation

The electrician will need to assess the existing installation and establish safe working arrangements. Replacement involves an interruption to the relevant supply. Agree the practical arrangements in advance, including how you will work around the property during the visit.

Existing faults may change the work

A new consumer unit does not repair every defect in existing wiring. If testing identifies a problem, ask for a clear explanation of the affected circuit and proposed action. Any additional work and charges should be agreed before proceeding. Do not expect a particular circuit to be reconnected until it can be put into service safely.

Testing, labels and handover

The installation needs appropriate inspection and testing after the work. Ask the electrician to explain the circuit labels, the equipment fitted and the documentation supplied. Keep the relevant electrical certificate and any Building Regulations documentation with your property records.

Preparing for a Basildon installation

Send your postcode, photographs of the existing board and any report before booking. Include access restrictions, occupancy and planned additions. We can then discuss an assessment, the proposed scope and practical appointment arrangements.

Further reading: the IET explains how existing installations are assessed; an older installation is not automatically unsafe because a standard has changed.