
Gabriel Paiu
Old walls can have different type of plastering(finishing), some walls are made from sand and very little cement. It is inevitable on that kind of wall to not have any cracks. If your house is older than 60 years then you have to accept this collateral damage. The electrician focuses on electrical works. It is not his fault if some small areas of the wall fells down when he makes the channel or the holes for sockets. I would recommend to both client and trade man to discuss all the job's aspects before starting.