Practical guidance from Kore Electrical
The practical answer
An older fuse box is not automatically unsafe merely because it is old, but it may lack appropriate protection or show damage that deserves investigation. Heat discolouration, poor labelling, repeated tripping or missing RCD protection are reasons to arrange an assessment. A new consumer unit should not be used to hide defects in existing circuits; they need inspection and testing as part of the work.
This guidance is general and cannot replace inspection or testing of the actual installation. If there are signs of danger, isolate the affected circuit where safe and seek professional help.
Does a replacement fix the wiring as well?
A new consumer unit does not renew the cables or accessories elsewhere in the property. Existing circuits, earthing and bonding need assessment so defects can be identified before an upgrade is agreed. Some installations need remedial work alongside the replacement.
Will the power be off?
Plan for an interruption during replacement and testing. Tell Kore about medical equipment, home working, alarms or equipment that cannot simply be disconnected. The likely duration and arrangements depend on the installation and agreed scope.
What information helps with a quote?
Send the postcode, a description of why you are considering an upgrade and a photograph of the closed consumer unit if it is safely accessible. Do not remove the cover. Mention planned additions such as an EV charger or extension.
Further electrical safety guidance: Electrical Safety First.