Commercial General Liability Insurance
No matter what kind of work you do, this is the one type of insurance that every contractor needs to have. This can cover anything from a fire from electrical short to a water loss. Many jobsites will not let you work on them unless you have this liability insurance.
Completed Operations Liability Insurance
This covers you, should someone sue you alleging that your work failed and caused damage, even after you have left the jobsite.
Loss of Income Insurance
In the event of an insured loss to your business, like a fire or other disaster, this insurance coverage will pay for your lost income to keep your business going until you are back up to full strength.