Responsibility for Damages Caused by My Workers

For the purpose of renovating the bathroom, I needed to cut the sewage pipe and replace it with another pipe. The cut had to be made in the bathroom of the neighbor one floor below my apartment. I asked the owner (who rents out the apartment) and he approved it, but conditioned it on me painting the wall around the cut area that was supposed to be damaged as a result of the cut, and so I did. I also told him that I would be with the workers during the work, and so I did. He asked me to deposit a security check of 1000 NIS with him (so that if there were damages, he wouldn't have to get money from me), and so I did. Since the workers (non-Jews) did not cover the toilet, sawdust from the cut fell into the toilet bowl, and this made the water in the toilet dirty. Also, the tank lid was scratched as a result of pieces falling on it, and also because after the work, the workers scraped the dirt with an iron spatula that scratched it. All the damages could have been avoided if they had covered it properly. My question is, do I need to replace the toilet bowl, as well as the tank lid (lids are not sold separately, only a whole tank), or pay money, because although he did not talk to me about such damage, he did talk to me about damages. Also, do I need to inform him about what happened in the apartment (he only rents it out and does not live there), and do I need to ask for his forgiveness or give him monetary compensation.

Peace and blessings 

If it concerns scratches that occur from regular use, there is no need to pay.

If it is a significant damage, one must pay according to the damage. 

It is impossible to delve into all the laws without hearing all the details precisely.