Type Of Insurance

[sk9]

Could someone advise is it necessary you have additional insurance to cover accidental damage or extended time, we have a small business, servicing public and commercial clients. We have public liability cover, but I was thinking if one of installation went wrong, due to any reason and we had to redo a install, thus causing a customer to open late or it caused an additional problem what insurance would cover this eventuality, I would like to cover us for these circumstances, is this possible?

thanks