Obviously there is the possibility to chase the original builderelectrician for the paperwork but I doubt you ' ll get very far without alot of hassle . To make sure it ' s safe quickly and cost effectively and thanks to the Part P regs change in 2013 you should get a Part P qualified electrician to conduct a EICR Electrical Installation Condition Report on the converted garage . It should cost you around 100 and list any remedial works that would require fixing before it ' s compliant with the regs . Your council should also accept the report in place of a Part P installation certificate if the builderelectrician that installed it has effectively absconded and they said they would submit the paperwork . The key part here is that you only just found out that it hadn ' t be registered and you ' ve acted quickly to make sure it is compliant , you ' re not waiting around just because you think you ' ll get away with it .