Guide · Updated October 2026

Do I need a full rewire?

An unsatisfactory EICR rarely means a full rewire. Here is how the decision is made.

Usually repair and upgrade

PVC-insulated cable with good insulation resistance results
Faults limited to accessories, bonding or RCD protection
A few damaged or undersized circuits that can be replaced individually

Usually rewire

Rubber or lead-sheathed cable still in use
Widespread low insulation resistance across many circuits
No protective conductors on lighting circuits throughout
Heavy, undocumented alterations that cannot be traced or verified

Partial rewires

Often only one floor or one circuit type, such as lighting, needs replacing. A partial rewire can be timed with redecoration or a void period between tenancies.

An EICR gives you the evidence to decide. Ask the inspector to state clearly whether they recommend repairs, a partial rewire or a full rewire, and why.