Understand what a board replacement changes
A consumer-unit upgrade replaces the board and specifies the appropriate protective arrangements. It may be proposed because of its condition, inspection findings or the requirements of planned work.
The existing circuits still need assessment. A new board does not repair damaged wiring or unsuitable connections elsewhere, and existing defects may need to be resolved as part of the wider job.
Understand what a rewire changes
Understand what a rewire changes
A full rewire replaces wiring across the property. A partial rewire replaces or alters a defined part, such as circuits serving a renovated kitchen. Both need a clear schedule of positions, equipment and rooms.
The level of disruption depends on routes, access and whether the property is occupied. Lifting floors, chasing walls and arranging power interruption are practical parts of the discussion, not details to leave until installation day.
Use condition and plans to define the next step
Use condition and plans to define the next step
An inspection or targeted investigation can help distinguish a local defect from a wider condition problem. The age or appearance of a board alone cannot confirm the scope of wiring replacement.
Tell the electrician about extensions, new equipment and future room changes. A recommendation should address both the existing condition and the installation you are asking it to support.
Compare complete quotations
Compare complete quotations
For a board change, ask about circuit testing, earthing and bonding, any existing faults, protective devices, labels, certification and notification. For a rewire, add the point schedule, fittings, access and making-good responsibilities.
A lower headline price may simply describe less work. Put the proposed scope alongside the price before comparing two quotes. Ask what happens if investigation identifies additional work.
Keep the documentation clear
Keep the documentation clear
Consumer-unit replacement and new circuits in a dwelling in England are notifiable under Building Regulations. Confirm the notification route and the installation certification in advance.
An EICR is a condition report for an existing installation. It is not a substitute name for the certificate recording new installation work. Keep the documents that match the work completed.
Questions answered
Can a new fuse box make old wiring safe?
A replacement board changes the distribution and protection arrangements, but does not repair defects in retained wiring. The circuits, earthing and bonding need assessment alongside the proposed board. Ask the electrician to distinguish the board replacement from any associated repairs or wiring that needs replacing.
Ask Max about thisHow can I tell whether I need a partial or full rewire?
Use an assessment of the installation and a clear description of your planned changes. The property's age or the appearance of its fuse box cannot determine the whole scope. Ask which circuits would be retained, what evidence supports replacement and how new and existing work would connect.
Ask Max about thisShould the consumer unit be changed before new kitchen circuits are installed?
Plan both jobs together so the proposed circuits and protective arrangements inform the specification. Whether the board needs replacing depends on the existing installation and the intended work. Share the kitchen plan and equipment details before agreeing a board size or installation sequence.
Ask Max about thisIs changing a consumer unit less disruptive than a full rewire?
The work generally affects different parts of the property: a board replacement centres on the distribution equipment and testing, while a rewire involves cable routes and points throughout its agreed scope. Existing faults may add work to either job. Ask about access, shutdowns and making good before comparing them.
Ask Max about thisWhy have two electricians recommended different amounts of work?
Check which circuits, defects and planned changes each recommendation addresses. A board replacement and a rewire have different scopes. Ask for the findings behind each proposal, what wiring would remain and what associated repairs are included before comparing the total prices.
Ask Max about thisCheck the original guidance.
These sources explain the relevant requirements. The condition and scope of your own installation still need assessment.
Guidance reviewed 24 October 2026.
