It is advisable to have a full electrical inspection carried out every two, three or five years depending on the condition of electrical wiring.  This examination investigates the state of the electrical wiring throughout the property and thoroughly checks the safety of the electrical installation.  These inspections can cost from £100 to £250.  The electrician should issue you with a 'Periodic Inspection Report for an Electrical Installation' at the end of the examination, which declares the electrical installation as safe.