Subcontractors are completing work for your customers on your behalf so you can and will be held liable for that work.
A typical example people dont think applies is an electrician coming to your business property to do some work. If they damage or injure someone whilst there you could be held liable.
There is definitely risk engaging subcontractors, be aware of the risks and mitigate them as much as you can. Your insurance broker should be talking to you about this.
Reach out if concerened about your levels of insurance cover.
Call 1300 62 80 80 or contact us www.newcastleinsurancegroup.com.au