The cost of upgrading a consumer unit is usually about £500 but it can be more or less depending on the size of the property and the number of circuits in the system.
The process is in three parts - test the system to see if there are any existing defects; if no defects are found then the consumer unit is changed; once the consumer unit is changed the system must be tested again to ensure everything has been connected correctly and is working correctly.Generally we advise that you have the first part carried out - called a Periodic Inspection and Test Report - by an NICEIC Approved Contractor, such as Cable Guys. If any defects are identified then these must be rectified before the consumer unit can be changed. The report can be taken to any other electrician so that you can get several quotes for the remedial work and the consumer unit change.
It would normally take about half a day to change a consumer unit, and then test and certify to work.
