There are no set rules to when a property should be rewired.
If you answer yes to any of the below questions then you may want to consider a rewire:
Has the rubber seals and encasing of your electrical wires degraded or been damaged since it was installed?
Have any of your lights or switches recently stopped working?
Has your home been flooded or water damaged recently and caused severe damage to the building?
A rewire provides the perfect opportunity to start fresh and design fixture and fittings to suit your requirements.